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qimage.cpp

/****************************************************************************
** $Id: qt/qimage.cpp   3.3.7   edited Oct 19 14:53 $
**
** Implementation of QImage and QImageIO classes
**
** Created : 950207
**
** Copyright (C) 1992-2005 Trolltech AS.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "qimage.h"
#include "qregexp.h"
#include "qfile.h"
#include "qdatastream.h"
#include "qtextstream.h"
#include "qbuffer.h"
#include "qptrlist.h"
#include "qasyncimageio.h"
#include "qpngio.h"
#include "qmngio.h"
#include "qjpegio.h"
#include "qmap.h"
#include <private/qpluginmanager_p.h>
#include "qimageformatinterface_p.h"
#include "qwmatrix.h"
#include "qapplication.h"
#include "qmime.h"
#include "qdragobject.h"
#include <ctype.h>
#include <stdlib.h>

#ifdef Q_WS_QWS
#include "qgfx_qws.h"
#endif

// 16bpp images on supported on Qt/Embedded
#if !defined( Q_WS_QWS ) && !defined(QT_NO_IMAGE_16_BIT)
#define QT_NO_IMAGE_16_BIT
#endif


/*!
    \class QImage
    \brief The QImage class provides a hardware-independent pixmap
    representation with direct access to the pixel data.

    \ingroup images
    \ingroup graphics
    \ingroup shared
    \mainclass

    It is one of the two classes Qt provides for dealing with images,
    the other being QPixmap. QImage is designed and optimized for I/O
    and for direct pixel access/manipulation. QPixmap is designed and
    optimized for drawing. There are (slow) functions to convert
    between QImage and QPixmap: QPixmap::convertToImage() and
    QPixmap::convertFromImage().

    An image has the parameters \link width() width\endlink, \link
    height() height\endlink and \link depth() depth\endlink (bits per
    pixel, bpp), a color table and the actual \link bits()
    pixels\endlink. QImage supports 1-bpp, 8-bpp and 32-bpp image
    data. 1-bpp and 8-bpp images use a color lookup table; the pixel
    value is a color table index.

    32-bpp images encode an RGB value in 24 bits and ignore the color
    table. The most significant byte is used for the \link
    setAlphaBuffer() alpha buffer\endlink.

    An entry in the color table is an RGB triplet encoded as a \c
    uint. Use the \link ::qRed() qRed()\endlink, \link ::qGreen()
    qGreen()\endlink and \link ::qBlue() qBlue()\endlink functions (\c
    qcolor.h) to access the components, and \link ::qRgb()
    qRgb\endlink to make an RGB triplet (see the QColor class
    documentation).

    1-bpp (monochrome) images have a color table with a most two
    colors. There are two different formats: big endian (MSB first) or
    little endian (LSB first) bit order. To access a single bit you
    will must do some bit shifts:

    \code
    QImage image;
    // sets bit at (x,y) to 1
    if ( image.bitOrder() == QImage::LittleEndian )
      *(image.scanLine(y) + (x >> 3)) |= 1 << (x & 7);
    else
      *(image.scanLine(y) + (x >> 3)) |= 1 << (7 - (x & 7));
    \endcode

    If this looks complicated, it might be a good idea to convert the
    1-bpp image to an 8-bpp image using convertDepth().

    8-bpp images are much easier to work with than 1-bpp images
    because they have a single byte per pixel:

    \code
    QImage image;
    // set entry 19 in the color table to yellow
    image.setColor( 19, qRgb(255,255,0) );
    // set 8 bit pixel at (x,y) to value yellow (in color table)
    *(image.scanLine(y) + x) = 19;
    \endcode

    32-bpp images ignore the color table; instead, each pixel contains
    the RGB triplet. 24 bits contain the RGB value; the most
    significant byte is reserved for the alpha buffer.

    \code
    QImage image;
    // sets 32 bit pixel at (x,y) to yellow.
    uint *p = (uint *)image.scanLine(y) + x;
    *p = qRgb(255,255,0);
    \endcode

    On Qt/Embedded, scanlines are aligned to the pixel depth and may
    be padded to any degree, while on all other platforms, the
    scanlines are 32-bit aligned for all depths. The constructor
    taking a \c{uchar*} argument always expects 32-bit aligned data.
    On Qt/Embedded, an additional constructor allows the number of
    bytes-per-line to be specified.

    QImage supports a variety of methods for getting information about
    the image, for example, colorTable(), allGray(), isGrayscale(),
    bitOrder(), bytesPerLine(), depth(), dotsPerMeterX() and
    dotsPerMeterY(), hasAlphaBuffer(), numBytes(), numColors(), and
    width() and height().

    Pixel colors are retrieved with pixel() and set with setPixel().

    QImage also supports a number of functions for creating a new
    image that is a transformed version of the original. For example,
    copy(), convertBitOrder(), convertDepth(), createAlphaMask(),
    createHeuristicMask(), mirror(), scale(), smoothScale(), swapRGB()
    and xForm(). There are also functions for changing attributes of
    an image in-place, for example, setAlphaBuffer(), setColor(),
    setDotsPerMeterX() and setDotsPerMeterY() and setNumColors().

    Images can be loaded and saved in the supported formats. Images
    are saved to a file with save(). Images are loaded from a file
    with load() (or in the constructor) or from an array of data with
    loadFromData(). The lists of supported formats are available from
    inputFormatList() and outputFormatList().

    Strings of text may be added to images using setText().

    The QImage class uses explicit \link shclass.html sharing\endlink,
    similar to that used by QMemArray.

    New image formats can be added as \link plugins-howto.html
    plugins\endlink.

    \sa QImageIO QPixmap \link shclass.html Shared Classes\endlink
*/


/*!
    \enum QImage::Endian

    This enum type is used to describe the endianness of the CPU and
    graphics hardware.

    \value IgnoreEndian  Endianness does not matter. Useful for some
                   operations that are independent of endianness.
    \value BigEndian  Network byte order, as on SPARC and Motorola CPUs.
    \value LittleEndian  PC/Alpha byte order.
*/

/*!
    \enum Qt::ImageConversionFlags

    The conversion flag is a bitwise-OR of the following values. The
    options marked "(default)" are set if no other values from the
    list are included (since the defaults are zero):

    Color/Mono preference (ignored for QBitmap)
    \value AutoColor (default) - If the image has \link
         QImage::depth() depth\endlink 1 and contains only
         black and white pixels, the pixmap becomes monochrome.
    \value ColorOnly The pixmap is dithered/converted to the
         \link QPixmap::defaultDepth() native display depth\endlink.
    \value MonoOnly The pixmap becomes monochrome. If necessary,
         it is dithered using the chosen dithering algorithm.

    Dithering mode preference for RGB channels
    \value DiffuseDither (default) - A high-quality dither.
    \value OrderedDither A faster, more ordered dither.
    \value ThresholdDither No dithering; closest color is used.

    Dithering mode preference for alpha channel
    \value ThresholdAlphaDither (default) - No dithering.
    \value OrderedAlphaDither A faster, more ordered dither.
    \value DiffuseAlphaDither A high-quality dither.
    \value NoAlpha Not supported.

    Color matching versus dithering preference
    \value PreferDither (default when converting to a pixmap) - Always dither
         32-bit images when the image is converted to 8 bits.
    \value AvoidDither (default when converting for the purpose of saving to
         file) - Dither 32-bit images only if the image has more than 256
         colors and it is being converted to 8 bits.
    \value AutoDither Not supported.

    The following are not values that are used directly, but masks for
    the above classes:
    \value ColorMode_Mask  Mask for the color mode.
    \value Dither_Mask  Mask for the dithering mode for RGB channels.
    \value AlphaDither_Mask  Mask for the dithering mode for the alpha channel.
    \value DitherMode_Mask  Mask for the mode that determines the preference of
           color matching versus dithering.

    Using 0 as the conversion flag sets all the default options.
*/

#if defined(Q_CC_DEC) && defined(__alpha) && (__DECCXX_VER-0 >= 50190001)
#pragma message disable narrowptr
#endif

#ifndef QT_NO_IMAGE_TEXT
class QImageDataMisc {
public:
    QImageDataMisc() { }
    QImageDataMisc( const QImageDataMisc& o ) :
      text_lang(o.text_lang) { }

    QImageDataMisc& operator=(const QImageDataMisc& o)
    {
      text_lang = o.text_lang;
      return *this;
    }
    QValueList<QImageTextKeyLang> list()
    {
      return text_lang.keys();
    }

    QStringList languages()
    {
      QStringList r;
      QMap<QImageTextKeyLang,QString>::Iterator it = text_lang.begin();
      for ( ; it != text_lang.end(); ++it ) {
          r.remove( it.key().lang );
          r.append( it.key().lang );
      }
      return r;
    }
    QStringList keys()
    {
      QStringList r;
      QMap<QImageTextKeyLang,QString>::Iterator it = text_lang.begin();
      for ( ; it != text_lang.end(); ++it ) {
          r.remove( it.key().key );
          r.append( it.key().key );
      }
      return r;
    }

    QMap<QImageTextKeyLang,QString> text_lang;
};
#endif // QT_NO_IMAGE_TEXT



/*****************************************************************************
  QImage member functions
 *****************************************************************************/

// table to flip bits
static const uchar bitflip[256] = {
    /*
      open OUT, "| fmt";
      for $i (0..255) {
          print OUT (($i >> 7) & 0x01) | (($i >> 5) & 0x02) |
                  (($i >> 3) & 0x04) | (($i >> 1) & 0x08) |
                  (($i << 7) & 0x80) | (($i << 5) & 0x40) |
                  (($i << 3) & 0x20) | (($i << 1) & 0x10), ", ";
      }
      close OUT;
    */
    0, 128, 64, 192, 32, 160, 96, 224, 16, 144, 80, 208, 48, 176, 112, 240,
    8, 136, 72, 200, 40, 168, 104, 232, 24, 152, 88, 216, 56, 184, 120, 248,
    4, 132, 68, 196, 36, 164, 100, 228, 20, 148, 84, 212, 52, 180, 116, 244,
    12, 140, 76, 204, 44, 172, 108, 236, 28, 156, 92, 220, 60, 188, 124, 252,
    2, 130, 66, 194, 34, 162, 98, 226, 18, 146, 82, 210, 50, 178, 114, 242,
    10, 138, 74, 202, 42, 170, 106, 234, 26, 154, 90, 218, 58, 186, 122, 250,
    6, 134, 70, 198, 38, 166, 102, 230, 22, 150, 86, 214, 54, 182, 118, 246,
    14, 142, 78, 206, 46, 174, 110, 238, 30, 158, 94, 222, 62, 190, 126, 254,
    1, 129, 65, 193, 33, 161, 97, 225, 17, 145, 81, 209, 49, 177, 113, 241,
    9, 137, 73, 201, 41, 169, 105, 233, 25, 153, 89, 217, 57, 185, 121, 249,
    5, 133, 69, 197, 37, 165, 101, 229, 21, 149, 85, 213, 53, 181, 117, 245,
    13, 141, 77, 205, 45, 173, 109, 237, 29, 157, 93, 221, 61, 189, 125, 253,
    3, 131, 67, 195, 35, 163, 99, 227, 19, 147, 83, 211, 51, 179, 115, 243,
    11, 139, 75, 203, 43, 171, 107, 235, 27, 155, 91, 219, 59, 187, 123, 251,
    7, 135, 71, 199, 39, 167, 103, 231, 23, 151, 87, 215, 55, 183, 119, 247,
    15, 143, 79, 207, 47, 175, 111, 239, 31, 159, 95, 223, 63, 191, 127, 255
};

const uchar *qt_get_bitflip_array()             // called from QPixmap code
{
    return bitflip;
}


/*!
    Constructs a null image.

    \sa isNull()
*/

00336 QImage::QImage()
{
    init();
}

/*!
    Constructs an image with \a w width, \a h height, \a depth bits
    per pixel, \a numColors colors and bit order \a bitOrder.

    Using this constructor is the same as first constructing a null
    image and then calling the create() function.

    \sa create()
*/

00351 QImage::QImage( int w, int h, int depth, int numColors, Endian bitOrder )
{
    init();
    create( w, h, depth, numColors, bitOrder );
}

/*!
    Constructs an image with size \a size pixels, depth \a depth bits,
    \a numColors and \a bitOrder endianness.

    Using this constructor is the same as first constructing a null
    image and then calling the create() function.

    \sa create()
*/
00366 QImage::QImage( const QSize& size, int depth, int numColors, Endian bitOrder )
{
    init();
    create( size, depth, numColors, bitOrder );
}

#ifndef QT_NO_IMAGEIO
/*!
    Constructs an image and tries to load the image from the file \a
    fileName.

    If \a format is specified, the loader attempts to read the image
    using the specified format. If \a format is not specified (which
    is the default), the loader reads a few bytes from the header to
    guess the file format.

    If the loading of the image failed, this object is a \link
    isNull() null\endlink image.

    The QImageIO documentation lists the supported image formats and
    explains how to add extra formats.

    \sa load() isNull() QImageIO
*/

00391 QImage::QImage( const QString &fileName, const char* format )
{
    init();
    load( fileName, format );
}

#ifndef QT_NO_IMAGEIO_XPM
// helper
static void read_xpm_image_or_array( QImageIO *, const char * const *, QImage & );
#endif
/*!
    Constructs an image from \a xpm, which must be a valid XPM image.

    Errors are silently ignored.

    Note that it's possible to squeeze the XPM variable a little bit
    by using an unusual declaration:

    \code
      static const char * const start_xpm[]={
          "16 15 8 1",
          "a c #cec6bd",
      ....
    \endcode

    The extra \c const makes the entire definition read-only, which is
    slightly more efficient (e.g. when the code is in a shared
    library) and ROMable when the application is to be stored in ROM.
*/

00421 QImage::QImage( const char * const xpm[] )
{
    init();
#ifndef QT_NO_IMAGEIO_XPM
    read_xpm_image_or_array( 0, xpm, *this );
#else
    // We use a qFatal rather than disabling the whole function, as this
    // constructor may be ambiguous.
    qFatal("XPM not supported");
#endif
}

/*!
    Constructs an image from the binary data \a array. It tries to
    guess the file format.

    If the loading of the image failed, this object is a \link
    isNull() null\endlink image.

    \sa loadFromData() isNull() imageFormat()
*/
00442 QImage::QImage( const QByteArray &array )
{
    init();
    loadFromData(array);
}
#endif //QT_NO_IMAGEIO


/*!
    Constructs a \link shclass.html shallow copy\endlink of \a image.
*/

00454 QImage::QImage( const QImage &image )
{
    data = image.data;
    data->ref();
}

/*!
    Constructs an image \a w pixels wide, \a h pixels high with a
    color depth of \a depth, that uses an existing memory buffer, \a
    yourdata. The buffer must remain valid throughout the life of the
    QImage. The image does not delete the buffer at destruction.

    If \a colortable is 0, a color table sufficient for \a numColors
    will be allocated (and destructed later).

    Note that \a yourdata must be 32-bit aligned.

    The endianness is given in \a bitOrder.
*/
00473 QImage::QImage( uchar* yourdata, int w, int h, int depth,
            QRgb* colortable, int numColors,
            Endian bitOrder )
{
    init();
    int bpl = ((w*depth+31)/32)*4;  // bytes per scanline
    if ( w <= 0 || h <= 0 || depth <= 0 || numColors < 0
         || INT_MAX / sizeof(uchar *) < uint(h)
         || INT_MAX / uint(depth) < uint(w)
         || bpl <= 0
         || INT_MAX / uint(bpl) < uint(h) )
      return;                             // invalid parameter(s)
    data->w = w;
    data->h = h;
    data->d = depth;
    data->ncols = depth != 32 ? numColors : 0;
    if ( !yourdata )
      return;         // Image header info can be saved without needing to allocate memory.
    data->nbytes = bpl*h;
    if ( colortable || !data->ncols ) {
      data->ctbl = colortable;
      data->ctbl_mine = FALSE;
    } else {
      // calloc since we realloc, etc. later (ick)
      data->ctbl = (QRgb*)calloc( data->ncols*sizeof(QRgb), data->ncols );
        Q_CHECK_PTR(data->ctbl);
      data->ctbl_mine = TRUE;
    }
    uchar** jt = (uchar**)malloc(h*sizeof(uchar*));
    Q_CHECK_PTR(jt);
    for (int j=0; j<h; j++) {
      jt[j] = yourdata+j*bpl;
    }
    data->bits = jt;
    data->bitordr = bitOrder;
}

#ifdef Q_WS_QWS

/*!
    Constructs an image that uses an existing memory buffer. The
    buffer must remain valid for the life of the QImage. The image
    does not delete the buffer at destruction. The buffer is passed as
    \a yourdata. The image's width is \a w and its height is \a h. The
    color depth is \a depth. \a bpl specifies the number of bytes per
    line.

    If \a colortable is 0, a color table sufficient for \a numColors
    will be allocated (and destructed later).

    The endianness is specified by \a bitOrder.

    \warning This constructor is only available on Qt/Embedded.
*/
QImage::QImage( uchar* yourdata, int w, int h, int depth,
            int bpl, QRgb* colortable, int numColors,
            Endian bitOrder )
{
    init();
    if ( !yourdata || w <= 0 || h <= 0 || depth <= 0 || numColors < 0
         || INT_MAX / sizeof(uchar *) < uint(h)
         || INT_MAX / uint(bpl) < uint(h)
         )
      return;                             // invalid parameter(s)
    data->w = w;
    data->h = h;
    data->d = depth;
    data->ncols = numColors;
    data->nbytes = bpl * h;
    if ( colortable || !numColors ) {
      data->ctbl = colortable;
      data->ctbl_mine = FALSE;
    } else {
      // calloc since we realloc, etc. later (ick)
      data->ctbl = (QRgb*)calloc( numColors*sizeof(QRgb), numColors );
        Q_CHECK_PTR(data->ctbl);
      data->ctbl_mine = TRUE;
    }
    uchar** jt = (uchar**)malloc(h*sizeof(uchar*));
    Q_CHECK_PTR(jt);
    for (int j=0; j<h; j++) {
      jt[j] = yourdata+j*bpl;
    }
    data->bits = jt;
    data->bitordr = bitOrder;
}
#endif // Q_WS_QWS

/*!
    Destroys the image and cleans up.
*/

00565 QImage::~QImage()
{
    if ( data && data->deref() ) {
      reset();
      delete data;
    }
}




/*! Convenience function. Gets the data associated with the absolute
  name \a abs_name from the default mime source factory and decodes it
  to an image.

  \sa QMimeSourceFactory, QImage::fromMimeSource(), QImageDrag::decode()
*/
#ifndef QT_NO_MIME
00583 QImage QImage::fromMimeSource( const QString &abs_name )
{
    const QMimeSource *m = QMimeSourceFactory::defaultFactory()->data( abs_name );
    if ( !m ) {
#if defined(QT_CHECK_STATE)
      qWarning("QImage::fromMimeSource: Cannot find image \"%s\" in the mime source factory", abs_name.latin1() );
#endif
      return QImage();
    }
    QImage img;
    QImageDrag::decode( m, img );
    return img;
}
#endif


/*!
    Assigns a \link shclass.html shallow copy\endlink of \a image to
    this image and returns a reference to this image.

    \sa copy()
*/

00606 QImage &QImage::operator=( const QImage &image )
{
    image.data->ref();                    // avoid 'x = x'
    if ( data->deref() ) {
      reset();
      delete data;
    }
    data = image.data;
    return *this;
}

/*!
    \overload

    Sets the image bits to the \a pixmap contents and returns a
    reference to the image.

    If the image shares data with other images, it will first
    dereference the shared data.

    Makes a call to QPixmap::convertToImage().
*/

00629 QImage &QImage::operator=( const QPixmap &pixmap )
{
    *this = pixmap.convertToImage();
    return *this;
}

/*!
    Detaches from shared image data and makes sure that this image is
    the only one referring to the data.

    If multiple images share common data, this image makes a copy of
    the data and detaches itself from the sharing mechanism.
    Nothing is done if there is just a single reference.

    \sa copy()
*/

00646 void QImage::detach()
{
    if ( data->count != 1 )
      *this = copy();
}

/*!
    Returns a \link shclass.html deep copy\endlink of the image.

    \sa detach()
*/

00658 QImage QImage::copy() const
{
    if ( isNull() ) {
      // maintain the fields of invalid QImages when copied
      return QImage( 0, width(), height(), depth(), colorTable(), numColors(), bitOrder() );
    } else {
      QImage image;
      image.create( width(), height(), depth(), numColors(), bitOrder() );
#ifdef Q_WS_QWS
      // Qt/Embedded can create images with non-default bpl
      // make sure we don't crash.
      if ( image.numBytes() != numBytes() )
          for ( int i = 0; i < height(); i++ )
            memcpy( image.scanLine(i), scanLine(i), image.bytesPerLine() );
      else
#endif
          memcpy( image.bits(), bits(), numBytes() );
      memcpy( image.colorTable(), colorTable(), numColors() * sizeof(QRgb) );
      image.setAlphaBuffer( hasAlphaBuffer() );
      image.data->dpmx = dotsPerMeterX();
      image.data->dpmy = dotsPerMeterY();
      image.data->offset = offset();
#ifndef QT_NO_IMAGE_TEXT
      if ( data->misc ) {
          image.data->misc = new QImageDataMisc;
          *image.data->misc = misc();
      }
#endif
      return image;
    }
}

/*!
    \overload

    Returns a \link shclass.html deep copy\endlink of a sub-area of
    the image.

    The returned image is always \a w by \a h pixels in size, and is
    copied from position \a x, \a y in this image. In areas beyond
    this image pixels are filled with pixel 0.

    If the image needs to be modified to fit in a lower-resolution
    result (e.g. converting from 32-bit to 8-bit), use the \a
    conversion_flags to specify how you'd prefer this to happen.

    \sa bitBlt() Qt::ImageConversionFlags
*/

00707 QImage QImage::copy(int x, int y, int w, int h, int conversion_flags) const
{
    int dx = 0;
    int dy = 0;
    if ( w <= 0 || h <= 0 ) return QImage(); // Nothing to copy

    QImage image( w, h, depth(), numColors(), bitOrder() );

    if ( x < 0 || y < 0 || x + w > width() || y + h > height() ) {
      // bitBlt will not cover entire image - clear it.
      // ### should deal with each side separately for efficiency
      image.fill(0);
      if ( x < 0 ) {
          dx = -x;
          x = 0;
      }
      if ( y < 0 ) {
          dy = -y;
          y = 0;
      }
    }

    bool has_alpha = hasAlphaBuffer();
    if ( has_alpha ) {
      // alpha channel should be only copied, not used by bitBlt(), and
      // this is mutable, we will restore the image state before returning
      QImage *that = (QImage *) this;
      that->setAlphaBuffer( FALSE );
    }
    memcpy( image.colorTable(), colorTable(), numColors()*sizeof(QRgb) );
    bitBlt( &image, dx, dy, this, x, y, -1, -1, conversion_flags );
    if ( has_alpha ) {
      // restore image state
      QImage *that = (QImage *) this;
      that->setAlphaBuffer( TRUE );
    }
    image.setAlphaBuffer(hasAlphaBuffer());
    image.data->dpmx = dotsPerMeterX();
    image.data->dpmy = dotsPerMeterY();
    image.data->offset = offset();
#ifndef QT_NO_IMAGE_TEXT
    if ( data->misc ) {
        image.data->misc = new QImageDataMisc;
        *image.data->misc = misc();
    }
#endif
    return image;
}

/*!
    \overload QImage QImage::copy(const QRect& r) const

    Returns a \link shclass.html deep copy\endlink of a sub-area of
    the image.

    The returned image always has the size of the rectangle \a r. In
    areas beyond this image pixels are filled with pixel 0.
*/

/*!
    \fn bool QImage::isNull() const

    Returns TRUE if it is a null image; otherwise returns FALSE.

    A null image has all parameters set to zero and no allocated data.
*/


/*!
    \fn int QImage::width() const

    Returns the width of the image.

    \sa height() size() rect()
*/

/*!
    \fn int QImage::height() const

    Returns the height of the image.

    \sa width() size() rect()
*/

/*!
    \fn QSize QImage::size() const

    Returns the size of the image, i.e. its width and height.

    \sa width() height() rect()
*/

/*!
    \fn QRect QImage::rect() const

    Returns the enclosing rectangle (0, 0, width(), height()) of the
    image.

    \sa width() height() size()
*/

/*!
    \fn int QImage::depth() const

    Returns the depth of the image.

    The image depth is the number of bits used to encode a single
    pixel, also called bits per pixel (bpp) or bit planes of an image.

    The supported depths are 1, 8, 16 (Qt/Embedded only) and 32.

    \sa convertDepth()
*/

/*!
    \fn int QImage::numColors() const

    Returns the size of the color table for the image.

    Notice that numColors() returns 0 for 16-bpp (Qt/Embedded only)
    and 32-bpp images because these images do not use color tables,
    but instead encode pixel values as RGB triplets.

    \sa setNumColors() colorTable()
*/

/*!
    \fn QImage::Endian QImage::bitOrder() const

    Returns the bit order for the image.

    If it is a 1-bpp image, this function returns either
    QImage::BigEndian or QImage::LittleEndian.

    If it is not a 1-bpp image, this function returns
    QImage::IgnoreEndian.

    \sa depth()
*/

/*!
    \fn uchar **QImage::jumpTable() const

    Returns a pointer to the scanline pointer table.

    This is the beginning of the data block for the image.

    \sa bits() scanLine()
*/

/*!
    \fn QRgb *QImage::colorTable() const

    Returns a pointer to the color table.

    \sa numColors()
*/

/*!
    \fn int QImage::numBytes() const

    Returns the number of bytes occupied by the image data.

    \sa bytesPerLine() bits()
*/

/*!
    \fn int QImage::bytesPerLine() const

    Returns the number of bytes per image scanline. This is equivalent
    to numBytes()/height().

    \sa numBytes() scanLine()
*/

/*!
    \fn QRgb QImage::color( int i ) const

    Returns the color in the color table at index \a i. The first
    color is at index 0.

    A color value is an RGB triplet. Use the \link ::qRed()
    qRed()\endlink, \link ::qGreen() qGreen()\endlink and \link
    ::qBlue() qBlue()\endlink functions (defined in \c qcolor.h) to
    get the color value components.

    \sa setColor() numColors() QColor
*/

/*!
    \fn void QImage::setColor( int i, QRgb c )

    Sets a color in the color table at index \a i to \a c.

    A color value is an RGB triplet. Use the \link ::qRgb()
    qRgb()\endlink function (defined in \c qcolor.h) to make RGB
    triplets.

    \sa color() setNumColors() numColors()
*/

/*!
    \fn uchar *QImage::scanLine( int i ) const

    Returns a pointer to the pixel data at the scanline with index \a
    i. The first scanline is at index 0.

    The scanline data is aligned on a 32-bit boundary.

    \warning If you are accessing 32-bpp image data, cast the returned
    pointer to \c{QRgb*} (QRgb has a 32-bit size) and use it to
    read/write the pixel value. You cannot use the \c{uchar*} pointer
    directly, because the pixel format depends on the byte order on
    the underlying platform. Hint: use \link ::qRed() qRed()\endlink,
    \link ::qGreen() qGreen()\endlink and \link ::qBlue()
    qBlue()\endlink, etc. (qcolor.h) to access the pixels.

    \warning If you are accessing 16-bpp image data, you must handle
    endianness yourself. (Qt/Embedded only)

    \sa bytesPerLine() bits() jumpTable()
*/

/*!
    \fn uchar *QImage::bits() const

    Returns a pointer to the first pixel data. This is equivalent to
    scanLine(0).

    \sa numBytes() scanLine() jumpTable()
*/



void QImage::warningIndexRange( const char *func, int i )
{
#if defined(QT_CHECK_RANGE)
    qWarning( "QImage::%s: Index %d out of range", func, i );
#else
    Q_UNUSED( func )
    Q_UNUSED( i )
#endif
}


/*!
    Resets all image parameters and deallocates the image data.
*/

00956 void QImage::reset()
{
    freeBits();
    setNumColors( 0 );
#ifndef QT_NO_IMAGE_TEXT
    delete data->misc;
#endif
    reinit();
}


/*!
    Fills the entire image with the pixel value \a pixel.

    If the \link depth() depth\endlink of this image is 1, only the
    lowest bit is used. If you say fill(0), fill(2), etc., the image
    is filled with 0s. If you say fill(1), fill(3), etc., the image is
    filled with 1s. If the depth is 8, the lowest 8 bits are used.

    If the depth is 32 and the image has no alpha buffer, the \a pixel
    value is written to each pixel in the image. If the image has an
    alpha buffer, only the 24 RGB bits are set and the upper 8 bits
    (alpha value) are left unchanged.

    Note: QImage::pixel() returns the color of the pixel at the given
    coordinates; QColor::pixel() returns the pixel value of the
    underlying window system (essentially an index value), so normally
    you will want to use QImage::pixel() to use a color from an
    existing image or QColor::rgb() to use a specific color.

    \sa invertPixels() depth() hasAlphaBuffer() create()
*/

00989 void QImage::fill( uint pixel )
{
    if ( depth() == 1 || depth() == 8 ) {
      if ( depth() == 1 ) {
          if ( pixel & 1 )
            pixel = 0xffffffff;
          else
            pixel = 0;
      } else {
          uint c = pixel & 0xff;
          pixel = c | ((c << 8) & 0xff00) | ((c << 16) & 0xff0000) |
                ((c << 24) & 0xff000000);
      }
      int bpl = bytesPerLine();
      for ( int i=0; i<height(); i++ )
          memset( scanLine(i), pixel, bpl );
#ifndef QT_NO_IMAGE_16_BIT
    } else if ( depth() == 16 ) {
      for ( int i=0; i<height(); i++ ) {
          //optimize with 32-bit writes, since image is always aligned
          uint *p = (uint *)scanLine(i);
          uint *end = (uint*)(((ushort*)p) + width());
          uint fill;
          ushort *f = (ushort*)&fill;
          f[0]=pixel;
          f[1]=pixel;
          while ( p < end )
            *p++ = fill;
      }
#endif      // QT_NO_IMAGE_16_BIT
#ifndef QT_NO_IMAGE_TRUECOLOR
    } else if ( depth() == 32 ) {
      if ( hasAlphaBuffer() ) {
          pixel &= 0x00ffffff;
          for ( int i=0; i<height(); i++ ) {
            uint *p = (uint *)scanLine(i);
            uint *end = p + width();
            while ( p < end ) {
                *p = (*p & 0xff000000) | pixel;
                p++;
            }
          }
      } else {
          for ( int i=0; i<height(); i++ ) {
            uint *p = (uint *)scanLine(i);
            uint *end = p + width();
            while ( p < end )
                *p++ = pixel;
          }
      }
#endif // QT_NO_IMAGE_TRUECOLOR
    }
}


/*!
    Inverts all pixel values in the image.

    If the depth is 32: if \a invertAlpha is TRUE, the alpha bits are
    also inverted, otherwise they are left unchanged.

    If the depth is not 32, the argument \a invertAlpha has no
    meaning.

    Note that inverting an 8-bit image means to replace all pixels
    using color index \e i with a pixel using color index 255 minus \e
    i. Similarly for a 1-bit image. The color table is not changed.

    \sa fill() depth() hasAlphaBuffer()
*/

01060 void QImage::invertPixels( bool invertAlpha )
{
    Q_UINT32 n = numBytes();
    if ( n % 4 ) {
      Q_UINT8 *p = (Q_UINT8*)bits();
      Q_UINT8 *end = p + n;
      while ( p < end )
          *p++ ^= 0xff;
    } else {
      Q_UINT32 *p = (Q_UINT32*)bits();
      Q_UINT32 *end = p + n/4;
      uint xorbits = invertAlpha && depth() == 32 ? 0x00ffffff : 0xffffffff;
      while ( p < end )
          *p++ ^= xorbits;
    }
}


/*!
    Determines the host computer byte order. Returns
    QImage::LittleEndian (LSB first) or QImage::BigEndian (MSB first).

    \sa systemBitOrder()
*/

01085 QImage::Endian QImage::systemByteOrder()
{
    static Endian sbo = IgnoreEndian;
    if ( sbo == IgnoreEndian ) {          // initialize
      int  ws;
      bool be;
      qSysInfo( &ws, &be );
      sbo = be ? BigEndian : LittleEndian;
    }
    return sbo;
}


#if defined(Q_WS_X11)
#include <X11/Xlib.h>                     // needed for systemBitOrder
#include <X11/Xutil.h>
#include <X11/Xos.h>
#if defined(Q_OS_WIN32)
#undef open
#undef close
#undef read
#undef write
#endif
#endif

// POSIX Large File Support redefines open -> open64
#if defined(open)
# undef open
#endif

// POSIX Large File Support redefines truncate -> truncate64
#if defined(truncate)
# undef truncate
#endif

/*!
    Determines the bit order of the display hardware. Returns
    QImage::LittleEndian (LSB first) or QImage::BigEndian (MSB first).

    \sa systemByteOrder()
*/

01127 QImage::Endian QImage::systemBitOrder()
{
#if defined(Q_WS_X11)
    return BitmapBitOrder(qt_xdisplay()) == MSBFirst ? BigEndian :LittleEndian;
#else
    return BigEndian;
#endif
}


/*!
    Resizes the color table to \a numColors colors.

    If the color table is expanded all the extra colors will be set to
    black (RGB 0,0,0).

    \sa numColors() color() setColor() colorTable()
*/

01146 void QImage::setNumColors( int numColors )
{
    if ( numColors == data->ncols )
      return;
    if ( numColors == 0 ) {               // use no color table
      if ( data->ctbl ) {
          if ( data->ctbl_mine )
            free( data->ctbl );
          else
            data->ctbl_mine = TRUE;
          data->ctbl = 0;
      }
      data->ncols = 0;
      return;
    }
    if ( data->ctbl && data->ctbl_mine ) {      // already has color table
      data->ctbl = (QRgb*)realloc( data->ctbl, numColors*sizeof(QRgb) );
      if ( data->ctbl && numColors > data->ncols )
          memset( (char *)&data->ctbl[data->ncols], 0,
                (numColors-data->ncols)*sizeof(QRgb) );
    } else {                              // create new color table
      data->ctbl = (QRgb*)calloc( numColors*sizeof(QRgb), 1 );
        Q_CHECK_PTR(data->ctbl);
      data->ctbl_mine = TRUE;
    }
    data->ncols = data->ctbl == 0 ? 0 : numColors;
}


/*!
    \fn bool QImage::hasAlphaBuffer() const

    Returns TRUE if alpha buffer mode is enabled; otherwise returns
    FALSE.

    \sa setAlphaBuffer()
*/

/*!
    Enables alpha buffer mode if \a enable is TRUE, otherwise disables
    it. The default setting is disabled.

    An 8-bpp image has 8-bit pixels. A pixel is an index into the
    \link color() color table\endlink, which contains 32-bit color
    values. In a 32-bpp image, the 32-bit pixels are the color values.

    This 32-bit value is encoded as follows: The lower 24 bits are
    used for the red, green, and blue components. The upper 8 bits
    contain the alpha component.

    The alpha component specifies the transparency of a pixel. 0 means
    completely transparent and 255 means opaque. The alpha component
    is ignored if you do not enable alpha buffer mode.

    The alpha buffer is used to set a mask when a QImage is translated
    to a QPixmap.

    \sa hasAlphaBuffer() createAlphaMask()
*/

01206 void QImage::setAlphaBuffer( bool enable )
{
    data->alpha = enable;
}


/*!
    Sets the image \a width, \a height, \a depth, its number of colors
    (in \a numColors), and bit order. Returns TRUE if successful, or
    FALSE if the parameters are incorrect or if memory cannot be
    allocated.

    The \a width and \a height is limited to 32767. \a depth must be
    1, 8, or 32. If \a depth is 1, \a bitOrder must be set to
    either QImage::LittleEndian or QImage::BigEndian. For other depths
    \a bitOrder must be QImage::IgnoreEndian.

    This function allocates a color table and a buffer for the image
    data. The image data is not initialized.

    The image buffer is allocated as a single block that consists of a
    table of \link scanLine() scanline\endlink pointers (jumpTable())
    and the image data (bits()).

    \sa fill() width() height() depth() numColors() bitOrder()
    jumpTable() scanLine() bits() bytesPerLine() numBytes()
*/

01234 bool QImage::create( int width, int height, int depth, int numColors,
                Endian bitOrder )
{
    reset();                              // reset old data
    if ( width <= 0 || height <= 0 || depth <= 0 || numColors < 0 )
      return FALSE;                       // invalid parameter(s)
    if ( depth == 1 && bitOrder == IgnoreEndian ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::create: Bit order is required for 1 bpp images" );
#endif
      return FALSE;
    }
    if ( depth != 1 )
      bitOrder = IgnoreEndian;

#if defined(QT_CHECK_RANGE)
    if ( depth == 24 )
      qWarning( "QImage::create: 24-bpp images no longer supported, "
              "use 32-bpp instead" );
#endif
    switch ( depth ) {
    case 1:
    case 8:
#ifndef QT_NO_IMAGE_16_BIT
    case 16:
#endif
#ifndef QT_NO_IMAGE_TRUECOLOR
    case 32:
#endif
      break;
    default:                        // invalid depth
      return FALSE;
    }

    if ( depth == 32 )
      numColors = 0;
    setNumColors( numColors );
    if ( data->ncols != numColors )       // could not alloc color table
      return FALSE;

    if ( INT_MAX / uint(depth) < uint(width) ) { // sanity check for potential overflow
      setNumColors( 0 );
      return FALSE;
    }
// Qt/Embedded doesn't waste memory on unnecessary padding.
#ifdef Q_WS_QWS
    const int bpl = (width*depth+7)/8;          // bytes per scanline
    const int pad = 0;
#else
    const int bpl = ((width*depth+31)/32)*4;    // bytes per scanline
    // #### WWA: shouldn't this be (width*depth+7)/8:
    const int pad = bpl - (width*depth)/8;      // pad with zeros
#endif
    if ( INT_MAX / uint(bpl) < uint(height)
        || bpl < 0
        || INT_MAX / sizeof(uchar *) < uint(height) ) { // sanity check for potential overflow
      setNumColors( 0 );
      return FALSE;
    }
    int nbytes = bpl*height;              // image size
    int ptbl   = height*sizeof(uchar*);         // pointer table size
    int size   = nbytes + ptbl;                 // total size of data block
    uchar **p  = (uchar **)malloc( size );      // alloc image bits
    Q_CHECK_PTR(p);
    if ( !p ) {                           // no memory
      setNumColors( 0 );
      return FALSE;
    }
    data->w = width;
    data->h = height;
    data->d = depth;
    data->nbytes  = nbytes;
    data->bitordr = bitOrder;
    data->bits = p;                       // set image pointer
    //uchar *d = (uchar*)p + ptbl;        // setup scanline pointers
    uchar *d = (uchar*)(p + height);            // setup scanline pointers
    while ( height-- ) {
      *p++ = d;
      if ( pad )
          memset( d+bpl-pad, 0, pad );
      d += bpl;
    }
    return TRUE;
}

/*!
    \overload bool QImage::create( const QSize&, int depth, int numColors, Endian bitOrder )
*/
01322 bool QImage::create( const QSize& size, int depth, int numColors,
                 QImage::Endian bitOrder )
{
    return create(size.width(), size.height(), depth, numColors, bitOrder);
}

/*!
  \internal
  Initializes the image data structure.
*/

01333 void QImage::init()
{
    data = new QImageData;
    Q_CHECK_PTR( data );
    reinit();
}

void QImage::reinit()
{
    data->w = data->h = data->d = data->ncols = 0;
    data->nbytes = 0;
    data->ctbl = 0;
    data->bits = 0;
    data->bitordr = QImage::IgnoreEndian;
    data->alpha = FALSE;
#ifndef QT_NO_IMAGE_TEXT
    data->misc = 0;
#endif
    data->dpmx = 0;
    data->dpmy = 0;
    data->offset = QPoint(0,0);
}

/*!
  \internal
  Deallocates the image data and sets the bits pointer to 0.
*/

01361 void QImage::freeBits()
{
    if ( data->bits ) {                   // dealloc image bits
      free( data->bits );
      data->bits = 0;
    }
}


/*****************************************************************************
  Internal routines for converting image depth.
 *****************************************************************************/

//
// convert_32_to_8:  Converts a 32 bits depth (true color) to an 8 bit
// image with a colormap. If the 32 bit image has more than 256 colors,
// we convert the red,green and blue bytes into a single byte encoded
// as 6 shades of each of red, green and blue.
//
// if dithering is needed, only 1 color at most is available for alpha.
//
#ifndef QT_NO_IMAGE_TRUECOLOR
struct QRgbMap {
    QRgbMap() : rgb(0xffffffff) { }
    bool used() const { return rgb!=0xffffffff; }
    uchar  pix;
    QRgb  rgb;
};

static bool convert_32_to_8( const QImage *src, QImage *dst, int conversion_flags, QRgb* palette=0, int palette_count=0 )
{
    register QRgb *p;
    uchar  *b;
    bool    do_quant = FALSE;
    int         y, x;

    if ( !dst->create(src->width(), src->height(), 8, 256) )
      return FALSE;

    const int tablesize = 997; // prime
    QRgbMap table[tablesize];
    int   pix=0;
    QRgb amask = src->hasAlphaBuffer() ? 0xffffffff : 0x00ffffff;
    if ( src->hasAlphaBuffer() )
      dst->setAlphaBuffer(TRUE);

    if ( palette ) {
      // Preload palette into table.

      p = palette;
      // Almost same code as pixel insertion below
      while ( palette_count-- > 0 ) {
          // Find in table...
          int hash = (*p & amask) % tablesize;
          for (;;) {
            if ( table[hash].used() ) {
                if ( table[hash].rgb == (*p & amask) ) {
                  // Found previous insertion - use it
                  break;
                } else {
                  // Keep searching...
                  if (++hash == tablesize) hash = 0;
                }
            } else {
                // Cannot be in table
                Q_ASSERT ( pix != 256 );  // too many colors
                // Insert into table at this unused position
                dst->setColor( pix, (*p & amask) );
                table[hash].pix = pix++;
                table[hash].rgb = *p & amask;
                break;
            }
          }
          p++;
      }
    }

    if ( (conversion_flags & Qt::DitherMode_Mask) == Qt::PreferDither ) {
      do_quant = TRUE;
    } else {
      for ( y=0; y<src->height(); y++ ) { // check if <= 256 colors
          p = (QRgb *)src->scanLine(y);
          b = dst->scanLine(y);
          x = src->width();
          while ( x-- ) {
            // Find in table...
            int hash = (*p & amask) % tablesize;
            for (;;) {
                if ( table[hash].used() ) {
                  if ( table[hash].rgb == (*p & amask) ) {
                      // Found previous insertion - use it
                      break;
                  } else {
                      // Keep searching...
                      if (++hash == tablesize) hash = 0;
                  }
                } else {
                  // Cannot be in table
                  if ( pix == 256 ) {     // too many colors
                      do_quant = TRUE;
                      // Break right out
                      x = 0;
                      y = src->height();
                  } else {
                      // Insert into table at this unused position
                      dst->setColor( pix, (*p & amask) );
                      table[hash].pix = pix++;
                      table[hash].rgb = (*p & amask);
                  }
                  break;
                }
            }
            *b++ = table[hash].pix;       // May occur once incorrectly
            p++;
          }
      }
    }
    int ncols = do_quant ? 256 : pix;

    static uint bm[16][16];
    static int init=0;
    if (!init) {
      // Build a Bayer Matrix for dithering

      init = 1;
      int n, i, j;

      bm[0][0]=0;

      for (n=1; n<16; n*=2) {
          for (i=0; i<n; i++) {
            for (j=0; j<n; j++) {
                bm[i][j]*=4;
                bm[i+n][j]=bm[i][j]+2;
                bm[i][j+n]=bm[i][j]+3;
                bm[i+n][j+n]=bm[i][j]+1;
            }
          }
      }

      for (i=0; i<16; i++)
          for (j=0; j<16; j++)
            bm[i][j]<<=8;
    }

    dst->setNumColors( ncols );

    if ( do_quant ) {                     // quantization needed

#define MAX_R 5
#define MAX_G 5
#define MAX_B 5
#define INDEXOF(r,g,b) (((r)*(MAX_G+1)+(g))*(MAX_B+1)+(b))

      int rc, gc, bc;

      for ( rc=0; rc<=MAX_R; rc++ )       // build 6x6x6 color cube
          for ( gc=0; gc<=MAX_G; gc++ )
            for ( bc=0; bc<=MAX_B; bc++ ) {
                dst->setColor( INDEXOF(rc,gc,bc),
                  (amask&0xff000000)
                  | qRgb( rc*255/MAX_R, gc*255/MAX_G, bc*255/MAX_B ) );
            }

      int sw = src->width();

      int* line1[3];
      int* line2[3];
      int* pv[3];
      if ( ( conversion_flags & Qt::Dither_Mask ) == Qt::DiffuseDither ) {
          line1[0] = new int[src->width()];
          line2[0] = new int[src->width()];
          line1[1] = new int[src->width()];
          line2[1] = new int[src->width()];
          line1[2] = new int[src->width()];
          line2[2] = new int[src->width()];
          pv[0] = new int[sw];
          pv[1] = new int[sw];
          pv[2] = new int[sw];
      }

      for ( y=0; y < src->height(); y++ ) {
          p = (QRgb *)src->scanLine(y);
          b = dst->scanLine(y);
          QRgb *end = p + sw;

          // perform quantization
          if ( ( conversion_flags & Qt::Dither_Mask ) == Qt::ThresholdDither ) {
#define DITHER(p,m) ((uchar) ((p * (m) + 127) / 255))
            while ( p < end ) {
                rc = qRed( *p );
                gc = qGreen( *p );
                bc = qBlue( *p );

                *b++ =
                  INDEXOF(
                      DITHER(rc, MAX_R),
                      DITHER(gc, MAX_G),
                      DITHER(bc, MAX_B)
                  );

                p++;
            }
#undef DITHER
          } else if ( ( conversion_flags & Qt::Dither_Mask ) == Qt::OrderedDither ) {
#define DITHER(p,d,m) ((uchar) ((((256 * (m) + (m) + 1)) * (p) + (d)) / 65536 ))

            int x = 0;
            while ( p < end ) {
                uint d = bm[y&15][x&15];

                rc = qRed( *p );
                gc = qGreen( *p );
                bc = qBlue( *p );

                *b++ =
                  INDEXOF(
                      DITHER(rc, d, MAX_R),
                      DITHER(gc, d, MAX_G),
                      DITHER(bc, d, MAX_B)
                  );

                p++;
                x++;
            }
#undef DITHER
          } else { // Diffuse
            int endian = (QImage::systemByteOrder() == QImage::BigEndian);
            int x;
            uchar* q = src->scanLine(y);
            uchar* q2 = src->scanLine(y+1 < src->height() ? y + 1 : 0);
            for (int chan = 0; chan < 3; chan++) {
                b = dst->scanLine(y);
                int *l1 = (y&1) ? line2[chan] : line1[chan];
                int *l2 = (y&1) ? line1[chan] : line2[chan];
                if ( y == 0 ) {
                  for (int i=0; i<sw; i++)
                      l1[i] = q[i*4+chan+endian];
                }
                if ( y+1 < src->height() ) {
                  for (int i=0; i<sw; i++)
                      l2[i] = q2[i*4+chan+endian];
                }
                // Bi-directional error diffusion
                if ( y&1 ) {
                  for (x=0; x<sw; x++) {
                      int pix = QMAX(QMIN(5, (l1[x] * 5 + 128)/ 255), 0);
                      int err = l1[x] - pix * 255 / 5;
                      pv[chan][x] = pix;

                      // Spread the error around...
                      if ( x+1<sw ) {
                        l1[x+1] += (err*7)>>4;
                        l2[x+1] += err>>4;
                      }
                      l2[x]+=(err*5)>>4;
                      if (x>1)
                        l2[x-1]+=(err*3)>>4;
                  }
                } else {
                  for (x=sw; x-->0; ) {
                      int pix = QMAX(QMIN(5, (l1[x] * 5 + 128)/ 255), 0);
                      int err = l1[x] - pix * 255 / 5;
                      pv[chan][x] = pix;

                      // Spread the error around...
                      if ( x > 0 ) {
                        l1[x-1] += (err*7)>>4;
                        l2[x-1] += err>>4;
                      }
                      l2[x]+=(err*5)>>4;
                      if (x+1 < sw)
                        l2[x+1]+=(err*3)>>4;
                  }
                }
            }
            if (endian) {
                for (x=0; x<sw; x++) {
                  *b++ = INDEXOF(pv[0][x],pv[1][x],pv[2][x]);
                }
            } else {
                for (x=0; x<sw; x++) {
                  *b++ = INDEXOF(pv[2][x],pv[1][x],pv[0][x]);
                }
            }
          }
      }

#ifndef QT_NO_IMAGE_DITHER_TO_1
      if ( src->hasAlphaBuffer() ) {
          const int trans = 216;
          dst->setColor(trans, 0x00000000);     // transparent
          QImage mask = src->createAlphaMask(conversion_flags);
          uchar* m;
          for ( y=0; y < src->height(); y++ ) {
            uchar bit = 0x80;
            m = mask.scanLine(y);
            b = dst->scanLine(y);
            int w = src->width();
            for ( x = 0; x<w; x++ ) {
                if ( !(*m&bit) )
                  b[x] = trans;
                if (!(bit >>= 1)) {
                  bit = 0x80;
                  while ( x<w-1 && *++m == 0xff ) // skip chunks
                      x+=8;
                }
            }
          }
      }
#endif

      if ( ( conversion_flags & Qt::Dither_Mask ) == Qt::DiffuseDither ) {
          delete [] line1[0];
          delete [] line2[0];
          delete [] line1[1];
          delete [] line2[1];
          delete [] line1[2];
          delete [] line2[2];
          delete [] pv[0];
          delete [] pv[1];
          delete [] pv[2];
      }

#undef MAX_R
#undef MAX_G
#undef MAX_B
#undef INDEXOF

    }

    return TRUE;
}


static bool convert_8_to_32( const QImage *src, QImage *dst )
{
    if ( !dst->create(src->width(), src->height(), 32) )
      return FALSE;                       // create failed
    dst->setAlphaBuffer( src->hasAlphaBuffer() );
    for ( int y=0; y<dst->height(); y++ ) {     // for each scan line...
      register uint *p = (uint *)dst->scanLine(y);
      uchar  *b = src->scanLine(y);
      uint *end = p + dst->width();
      while ( p < end )
          *p++ = src->color(*b++);
    }
    return TRUE;
}


static bool convert_1_to_32( const QImage *src, QImage *dst )
{
    if ( !dst->create(src->width(), src->height(), 32) )
      return FALSE;                       // could not create
    dst->setAlphaBuffer( src->hasAlphaBuffer() );
    for ( int y=0; y<dst->height(); y++ ) {     // for each scan line...
      register uint *p = (uint *)dst->scanLine(y);
      uchar *b = src->scanLine(y);
      int x;
      if ( src->bitOrder() == QImage::BigEndian ) {
          for ( x=0; x<dst->width(); x++ ) {
            *p++ = src->color( (*b >> (7 - (x & 7))) & 1 );
            if ( (x & 7) == 7 )
                b++;
          }
      } else {
          for ( x=0; x<dst->width(); x++ ) {
            *p++ = src->color( (*b >> (x & 7)) & 1 );
            if ( (x & 7) == 7 )
                b++;
          }
      }
    }
    return TRUE;
}
#endif // QT_NO_IMAGE_TRUECOLOR

static bool convert_1_to_8( const QImage *src, QImage *dst )
{
    if ( !dst->create(src->width(), src->height(), 8, 2) )
      return FALSE;                       // something failed
    dst->setAlphaBuffer( src->hasAlphaBuffer() );
    if (src->numColors() >= 2) {
      dst->setColor( 0, src->color(0) );  // copy color table
      dst->setColor( 1, src->color(1) );
    } else {
      // Unlikely, but they do exist
      if (src->numColors() >= 1)
          dst->setColor( 0, src->color(0) );
      else
          dst->setColor( 0, 0xffffffff );
      dst->setColor( 1, 0xff000000 );
    }
    for ( int y=0; y<dst->height(); y++ ) {     // for each scan line...
      register uchar *p = dst->scanLine(y);
      uchar *b = src->scanLine(y);
      int x;
      if ( src->bitOrder() == QImage::BigEndian ) {
          for ( x=0; x<dst->width(); x++ ) {
            *p++ = (*b >> (7 - (x & 7))) & 1;
            if ( (x & 7) == 7 )
                b++;
          }
      } else {
          for ( x=0; x<dst->width(); x++ ) {
            *p++ = (*b >> (x & 7)) & 1;
            if ( (x & 7) == 7 )
                b++;
          }
      }
    }
    return TRUE;
}

#ifndef QT_NO_IMAGE_DITHER_TO_1
//
// dither_to_1:  Uses selected dithering algorithm.
//

static bool dither_to_1( const QImage *src, QImage *dst,
                   int conversion_flags, bool fromalpha )
{
    if ( !dst->create(src->width(), src->height(), 1, 2, QImage::BigEndian) )
      return FALSE;                       // something failed

    enum { Threshold, Ordered, Diffuse } dithermode;

    if ( fromalpha ) {
      if ( ( conversion_flags & Qt::AlphaDither_Mask ) == Qt::DiffuseAlphaDither )
          dithermode = Diffuse;
      else if ( ( conversion_flags & Qt::AlphaDither_Mask ) == Qt::OrderedAlphaDither )
          dithermode = Ordered;
      else
          dithermode = Threshold;
    } else {
      if ( ( conversion_flags & Qt::Dither_Mask ) == Qt::ThresholdDither )
          dithermode = Threshold;
      else if ( ( conversion_flags & Qt::Dither_Mask ) == Qt::OrderedDither )
          dithermode = Ordered;
      else
          dithermode = Diffuse;
    }

    dst->setColor( 0, qRgb(255, 255, 255) );
    dst->setColor( 1, qRgb(  0,       0,   0) );
    int       w = src->width();
    int       h = src->height();
    int       d = src->depth();
    uchar gray[256];                      // gray map for 8 bit images
    bool  use_gray = d == 8;
    if ( use_gray ) {                     // make gray map
      if ( fromalpha ) {
          // Alpha 0x00 -> 0 pixels (white)
          // Alpha 0xFF -> 1 pixels (black)
          for ( int i=0; i<src->numColors(); i++ )
            gray[i] = (255 - (src->color(i) >> 24));
      } else {
          // Pixel 0x00 -> 1 pixels (black)
          // Pixel 0xFF -> 0 pixels (white)
          for ( int i=0; i<src->numColors(); i++ )
            gray[i] = qGray( src->color(i) & 0x00ffffff );
      }
    }

    switch ( dithermode ) {
      case Diffuse: {
      int *line1 = new int[w];
      int *line2 = new int[w];
      int bmwidth = (w+7)/8;
      if ( !(line1 && line2) )
          return FALSE;
      register uchar *p;
      uchar *end;
      int *b1, *b2;
      int wbytes = w * (d/8);
      p = src->bits();
      end = p + wbytes;
      b2 = line2;
      if ( use_gray ) {             // 8 bit image
          while ( p < end )
            *b2++ = gray[*p++];
#ifndef QT_NO_IMAGE_TRUECOLOR
      } else {                      // 32 bit image
          if ( fromalpha ) {
            while ( p < end ) {
                *b2++ = 255 - (*(uint*)p >> 24);
                p += 4;
            }
          } else {
            while ( p < end ) {
                *b2++ = qGray(*(uint*)p);
                p += 4;
            }
          }
#endif
      }
      int x, y;
      for ( y=0; y<h; y++ ) {             // for each scan line...
          int *tmp = line1; line1 = line2; line2 = tmp;
          bool not_last_line = y < h - 1;
          if ( not_last_line ) {          // calc. grayvals for next line
            p = src->scanLine(y+1);
            end = p + wbytes;
            b2 = line2;
            if ( use_gray ) {       // 8 bit image
                while ( p < end )
                  *b2++ = gray[*p++];
#ifndef QT_NO_IMAGE_TRUECOLOR
            } else {                // 24 bit image
                if ( fromalpha ) {
                  while ( p < end ) {
                      *b2++ = 255 - (*(uint*)p >> 24);
                      p += 4;
                  }
                } else {
                  while ( p < end ) {
                      *b2++ = qGray(*(uint*)p);
                      p += 4;
                  }
                }
#endif
            }
          }

          int err;
          p = dst->scanLine( y );
          memset( p, 0, bmwidth );
          b1 = line1;
          b2 = line2;
          int bit = 7;
          for ( x=1; x<=w; x++ ) {
            if ( *b1 < 128 ) {            // black pixel
                err = *b1++;
                *p |= 1 << bit;
            } else {                // white pixel
                err = *b1++ - 255;
            }
            if ( bit == 0 ) {
                p++;
                bit = 7;
            } else {
                bit--;
            }
            if ( x < w )
                *b1 += (err*7)>>4;        // spread error to right pixel
            if ( not_last_line ) {
                b2[0] += (err*5)>>4;      // pixel below
                if ( x > 1 )
                  b2[-1] += (err*3)>>4;   // pixel below left
                if ( x < w )
                  b2[1] += err>>4;  // pixel below right
            }
            b2++;
          }
      }
      delete [] line1;
      delete [] line2;
      } break;
      case Ordered: {
      static uint bm[16][16];
      static int init=0;
      if (!init) {
          // Build a Bayer Matrix for dithering

          init = 1;
          int n, i, j;

          bm[0][0]=0;

          for (n=1; n<16; n*=2) {
            for (i=0; i<n; i++) {
                for (j=0; j<n; j++) {
                  bm[i][j]*=4;
                  bm[i+n][j]=bm[i][j]+2;
                  bm[i][j+n]=bm[i][j]+3;
                  bm[i+n][j+n]=bm[i][j]+1;
                }
            }
          }

          // Force black to black
          bm[0][0]=1;
      }

      dst->fill( 0 );
      uchar** mline = dst->jumpTable();
#ifndef QT_NO_IMAGE_TRUECOLOR
      if ( d == 32 ) {
          uint** line = (uint**)src->jumpTable();
          for ( int i=0; i<h; i++ ) {
            uint  *p = line[i];
            uint  *end = p + w;
            uchar *m = mline[i];
            int bit = 7;
            int j = 0;
            if ( fromalpha ) {
                while ( p < end ) {
                  if ( (*p++ >> 24) >= bm[j++&15][i&15] )
                      *m |= 1 << bit;
                  if ( bit == 0 ) {
                      m++;
                      bit = 7;
                  } else {
                      bit--;
                  }
                }
            } else {
                while ( p < end ) {
                  if ( (uint)qGray(*p++) < bm[j++&15][i&15] )
                      *m |= 1 << bit;
                  if ( bit == 0 ) {
                      m++;
                      bit = 7;
                  } else {
                      bit--;
                  }
                }
            }
          }
      } else
#endif // QT_NO_IMAGE_TRUECOLOR
          /* ( d == 8 ) */ {
          uchar** line = src->jumpTable();
          for ( int i=0; i<h; i++ ) {
            uchar *p = line[i];
            uchar *end = p + w;
            uchar *m = mline[i];
            int bit = 7;
            int j = 0;
            while ( p < end ) {
                if ( (uint)gray[*p++] < bm[j++&15][i&15] )
                  *m |= 1 << bit;
                if ( bit == 0 ) {
                  m++;
                  bit = 7;
                } else {
                  bit--;
                }
            }
          }
      }
      } break;
      default: { // Threshold:
      dst->fill( 0 );
      uchar** mline = dst->jumpTable();
#ifndef QT_NO_IMAGE_TRUECOLOR
      if ( d == 32 ) {
          uint** line = (uint**)src->jumpTable();
          for ( int i=0; i<h; i++ ) {
            uint  *p = line[i];
            uint  *end = p + w;
            uchar *m = mline[i];
            int bit = 7;
            if ( fromalpha ) {
                while ( p < end ) {
                  if ( (*p++ >> 24) >= 128 )
                      *m |= 1 << bit;     // Set mask "on"
                  if ( bit == 0 ) {
                      m++;
                      bit = 7;
                  } else {
                      bit--;
                  }
                }
            } else {
                while ( p < end ) {
                  if ( qGray(*p++) < 128 )
                      *m |= 1 << bit;     // Set pixel "black"
                  if ( bit == 0 ) {
                      m++;
                      bit = 7;
                  } else {
                      bit--;
                  }
                }
            }
          }
      } else
#endif //QT_NO_IMAGE_TRUECOLOR
          if ( d == 8 ) {
          uchar** line = src->jumpTable();
          for ( int i=0; i<h; i++ ) {
            uchar *p = line[i];
            uchar *end = p + w;
            uchar *m = mline[i];
            int bit = 7;
            while ( p < end ) {
                if ( gray[*p++] < 128 )
                  *m |= 1 << bit;         // Set mask "on"/ pixel "black"
                if ( bit == 0 ) {
                  m++;
                  bit = 7;
                } else {
                  bit--;
                }
            }
          }
      }
      }
    }
    return TRUE;
}
#endif

#ifndef QT_NO_IMAGE_16_BIT
//###### Endianness issues!
static inline bool is16BitGray( ushort c )
{
    int r=(c & 0xf800) >> 11;
    int g=(c & 0x07e0) >> 6; //green/2
    int b=(c & 0x001f);
    return r == g && g == b;
}


static bool convert_16_to_32( const QImage *src, QImage *dst )
{
    if ( !dst->create(src->width(), src->height(), 32) )
      return FALSE;                       // create failed
    dst->setAlphaBuffer( src->hasAlphaBuffer() );
    for ( int y=0; y<dst->height(); y++ ) {     // for each scan line...
      register uint *p = (uint *)dst->scanLine(y);
      ushort  *s = (ushort*)src->scanLine(y);
      uint *end = p + dst->width();
      while ( p < end )
          *p++ = qt_conv16ToRgb( *s++ );
    }
    return TRUE;
}


static bool convert_32_to_16( const QImage *src, QImage *dst )
{
    if ( !dst->create(src->width(), src->height(), 16) )
      return FALSE;                       // create failed
    dst->setAlphaBuffer( src->hasAlphaBuffer() );
    for ( int y=0; y<dst->height(); y++ ) {     // for each scan line...
      register ushort *p = (ushort *)dst->scanLine(y);
      uint  *s = (uint*)src->scanLine(y);
      ushort *end = p + dst->width();
      while ( p < end )
          *p++ = qt_convRgbTo16( *s++ );
    }
    return TRUE;
}


#endif

/*!
    Converts the depth (bpp) of the image to \a depth and returns the
    converted image. The original image is not changed.

    The \a depth argument must be 1, 8, 16 (Qt/Embedded only) or 32.

    Returns \c *this if \a depth is equal to the image depth, or a
    \link isNull() null\endlink image if this image cannot be
    converted.

    If the image needs to be modified to fit in a lower-resolution
    result (e.g. converting from 32-bit to 8-bit), use the \a
    conversion_flags to specify how you'd prefer this to happen.

    \sa Qt::ImageConversionFlags depth() isNull()
*/

02128 QImage QImage::convertDepth( int depth, int conversion_flags ) const
{
    QImage image;
    if ( data->d == depth )
      image = *this;                      // no conversion
#ifndef QT_NO_IMAGE_DITHER_TO_1
    else if ( (data->d == 8 || data->d == 32) && depth == 1 ) // dither
      dither_to_1( this, &image, conversion_flags, FALSE );
#endif
#ifndef QT_NO_IMAGE_TRUECOLOR
    else if ( data->d == 32 && depth == 8 )     // 32 -> 8
      convert_32_to_8( this, &image, conversion_flags );
    else if ( data->d == 8 && depth == 32 )     // 8 -> 32
      convert_8_to_32( this, &image );
#endif
    else if ( data->d == 1 && depth == 8 )      // 1 -> 8
      convert_1_to_8( this, &image );
#ifndef QT_NO_IMAGE_TRUECOLOR
    else if ( data->d == 1 && depth == 32 )     // 1 -> 32
      convert_1_to_32( this, &image );
#endif
#ifndef QT_NO_IMAGE_16_BIT
    else if ( data->d == 16 && depth != 16 ) {
      QImage tmp;
      convert_16_to_32( this, &tmp );
      image = tmp.convertDepth( depth, conversion_flags );
    } else if ( data->d != 16 && depth == 16 ) {
      QImage tmp = convertDepth( 32, conversion_flags );
      convert_32_to_16( &tmp, &image );
    }
#endif
    else {
#if defined(QT_CHECK_RANGE)
      if ( isNull() )
          qWarning( "QImage::convertDepth: Image is a null image" );
      else
          qWarning( "QImage::convertDepth: Depth %d not supported", depth );
#endif
    }
    return image;
}

/*!
    \overload
*/

02174 QImage QImage::convertDepth( int depth ) const
{
    return convertDepth( depth, 0 );
}

/*!
    Returns TRUE if ( \a x, \a y ) is a valid coordinate in the image;
    otherwise returns FALSE.

    \sa width() height() pixelIndex()
*/

02186 bool QImage::valid( int x, int y ) const
{
    return x >= 0 && x < width()
      && y >= 0 && y < height();
}

/*!
    Returns the pixel index at the given coordinates.

    If (\a x, \a y) is not \link valid() valid\endlink, or if the
    image is not a paletted image (depth() > 8), the results are
    undefined.

    \sa valid() depth()
*/

02202 int QImage::pixelIndex( int x, int y ) const
{
#if defined(QT_CHECK_RANGE)
    if ( x < 0 || x >= width() ) {
      qWarning( "QImage::pixel: x=%d out of range", x );
      return -12345;
    }
#endif
    uchar * s = scanLine( y );
    switch( depth() ) {
    case 1:
      if ( bitOrder() == QImage::LittleEndian )
          return (*(s + (x >> 3)) >> (x & 7)) & 1;
      else
          return (*(s + (x >> 3)) >> (7- (x & 7))) & 1;
    case 8:
      return (int)s[x];
#ifndef QT_NO_IMAGE_TRUECOLOR
#ifndef QT_NO_IMAGE_16_BIT
    case 16:
#endif
    case 32:
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::pixelIndex: Not applicable for %d-bpp images "
             "(no palette)", depth() );
#endif
      return 0;
#endif //QT_NO_IMAGE_TRUECOLOR
    }
    return 0;
}


/*!
    Returns the color of the pixel at the coordinates (\a x, \a y).

    If (\a x, \a y) is not \link valid() on the image\endlink, the
    results are undefined.

    \sa setPixel() qRed() qGreen() qBlue() valid()
*/

02244 QRgb QImage::pixel( int x, int y ) const
{
#if defined(QT_CHECK_RANGE)
    if ( x < 0 || x >= width() ) {
      qWarning( "QImage::pixel: x=%d out of range", x );
      return 12345;
    }
#endif
    uchar * s = scanLine( y );
    switch( depth() ) {
    case 1:
      if ( bitOrder() == QImage::LittleEndian )
          return color( (*(s + (x >> 3)) >> (x & 7)) & 1 );
      else
          return color( (*(s + (x >> 3)) >> (7- (x & 7))) & 1 );
    case 8:
      return color( (int)s[x] );
#ifndef QT_NO_IMAGE_16_BIT
    case 16:
      return qt_conv16ToRgb(((ushort*)s)[x]);
#endif
#ifndef QT_NO_IMAGE_TRUECOLOR
    case 32:
      return ((QRgb*)s)[x];
#endif
    default:
      return 100367;
    }
}


/*!
    Sets the pixel index or color at the coordinates (\a x, \a y) to
    \a index_or_rgb.

    If (\a x, \a y) is not \link valid() valid\endlink, the result is
    undefined.

    If the image is a paletted image (depth() <= 8) and \a
    index_or_rgb >= numColors(), the result is undefined.

    \sa pixelIndex() pixel() qRgb() qRgba() valid()
*/

02288 void QImage::setPixel( int x, int y, uint index_or_rgb )
{
    if ( x < 0 || x >= width() ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::setPixel: x=%d out of range", x );
#endif
      return;
    }
    if ( depth() == 1 ) {
      uchar * s = scanLine( y );
      if ( index_or_rgb > 1) {
#if defined(QT_CHECK_RANGE)
          qWarning( "QImage::setPixel: index=%d out of range",
                 index_or_rgb );
#endif
      } else if ( bitOrder() == QImage::LittleEndian ) {
          if (index_or_rgb==0)
            *(s + (x >> 3)) &= ~(1 << (x & 7));
          else
            *(s + (x >> 3)) |= (1 << (x & 7));
      } else {
          if (index_or_rgb==0)
            *(s + (x >> 3)) &= ~(1 << (7-(x & 7)));
          else
            *(s + (x >> 3)) |= (1 << (7-(x & 7)));
      }
    } else if ( depth() == 8 ) {
      if (index_or_rgb > (uint)numColors()) {
#if defined(QT_CHECK_RANGE)
          qWarning( "QImage::setPixel: index=%d out of range",
                 index_or_rgb );
#endif
          return;
      }
      uchar * s = scanLine( y );
      s[x] = index_or_rgb;
#ifndef QT_NO_IMAGE_16_BIT
    } else if ( depth() == 16 ) {
      ushort * s = (ushort*)scanLine( y );
      s[x] = qt_convRgbTo16(index_or_rgb);
#endif
#ifndef QT_NO_IMAGE_TRUECOLOR
    } else if ( depth() == 32 ) {
      QRgb * s = (QRgb*)scanLine( y );
      s[x] = index_or_rgb;
#endif
    }
}


/*!
    Converts the bit order of the image to \a bitOrder and returns the
    converted image. The original image is not changed.

    Returns \c *this if the \a bitOrder is equal to the image bit
    order, or a \link isNull() null\endlink image if this image cannot
    be converted.

    \sa bitOrder() systemBitOrder() isNull()
*/

02349 QImage QImage::convertBitOrder( Endian bitOrder ) const
{
    if ( isNull() || data->d != 1 ||            // invalid argument(s)
       !(bitOrder == BigEndian || bitOrder == LittleEndian) ) {
      QImage nullImage;
      return nullImage;
    }
    if ( data->bitordr == bitOrder )            // nothing to do
      return copy();

    QImage image( data->w, data->h, 1, data->ncols, bitOrder );

    int bpl = (width() + 7) / 8;
    for ( int y = 0; y < data->h; y++ ) {
      register uchar *p = jumpTable()[y];
      uchar *end = p + bpl;
      uchar *b = image.jumpTable()[y];
      while ( p < end )
          *b++ = bitflip[*p++];
    }
    memcpy( image.colorTable(), colorTable(), numColors()*sizeof(QRgb) );
    return image;
}

// ### Candidate (renamed) for qcolor.h
static
bool isGray(QRgb c)
{
    return qRed(c) == qGreen(c)
      && qRed(c) == qBlue(c);
}

/*!
    Returns TRUE if all the colors in the image are shades of gray
    (i.e. their red, green and blue components are equal); otherwise
    returns FALSE.

    This function is slow for large 16-bit (Qt/Embedded only) and 32-bit images.

    \sa isGrayscale()
*/
02390 bool QImage::allGray() const
{
#ifndef QT_NO_IMAGE_TRUECOLOR
    if (depth()==32) {
      int p = width()*height();
      QRgb* b = (QRgb*)bits();
      while (p--)
          if (!isGray(*b++))
            return FALSE;
#ifndef QT_NO_IMAGE_16_BIT
    } else if (depth()==16) {
      int p = width()*height();
      ushort* b = (ushort*)bits();
      while (p--)
          if (!is16BitGray(*b++))
            return FALSE;
#endif
    } else
#endif //QT_NO_IMAGE_TRUECOLOR
      {
      if (!data->ctbl) return TRUE;
      for (int i=0; i<numColors(); i++)
          if (!isGray(data->ctbl[i]))
            return FALSE;
    }
    return TRUE;
}

/*!
    For 16-bit (Qt/Embedded only) and 32-bit images, this function is
    equivalent to allGray().

    For 8-bpp images, this function returns TRUE if color(i) is
    QRgb(i,i,i) for all indices of the color table; otherwise returns
    FALSE.

    \sa allGray() depth()
*/
02428 bool QImage::isGrayscale() const
{
    switch (depth()) {
#ifndef QT_NO_IMAGE_TRUECOLOR
    case 32:
#ifndef QT_NO_IMAGE_16_BIT
    case 16:
#endif
      return allGray();
#endif //QT_NO_IMAGE_TRUECOLOR
    case 8: {
      for (int i=0; i<numColors(); i++)
          if (data->ctbl[i] != qRgb(i,i,i))
            return FALSE;
      return TRUE;
      }
    }
    return FALSE;
}

#ifndef QT_NO_IMAGE_SMOOTHSCALE
static
void pnmscale(const QImage& src, QImage& dst)
{
    QRgb* xelrow = 0;
    QRgb* tempxelrow = 0;
    register QRgb* xP;
    register QRgb* nxP;
    int rows, cols, rowsread, newrows, newcols;
    register int row, col, needtoreadrow;
    const uchar maxval = 255;
    double xscale, yscale;
    long sxscale, syscale;
    register long fracrowtofill, fracrowleft;
    long* as;
    long* rs;
    long* gs;
    long* bs;
    int rowswritten = 0;

    cols = src.width();
    rows = src.height();
    newcols = dst.width();
    newrows = dst.height();

    long SCALE;
    long HALFSCALE;

    if (cols > 4096)
    {
        SCALE = 4096;
        HALFSCALE = 2048;
    }
    else
    {
        int fac = 4096;

        while (cols * fac > 4096)
        {
            fac /= 2;
        }

        SCALE = fac * cols;
        HALFSCALE = fac * cols / 2;
    }

    xscale = (double) newcols / (double) cols;
    yscale = (double) newrows / (double) rows;

    sxscale = (long)(xscale * SCALE);
    syscale = (long)(yscale * SCALE);

    if ( newrows != rows )    /* shortcut Y scaling if possible */
      tempxelrow = new QRgb[cols];

    if ( src.hasAlphaBuffer() ) {
      dst.setAlphaBuffer(TRUE);
      as = new long[cols];
      for ( col = 0; col < cols; ++col )
          as[col] = HALFSCALE;
    } else {
      as = 0;
    }
    rs = new long[cols];
    gs = new long[cols];
    bs = new long[cols];
    rowsread = 0;
    fracrowleft = syscale;
    needtoreadrow = 1;
    for ( col = 0; col < cols; ++col )
      rs[col] = gs[col] = bs[col] = HALFSCALE;
    fracrowtofill = SCALE;

    for ( row = 0; row < newrows; ++row ) {
      /* First scale Y from xelrow into tempxelrow. */
      if ( newrows == rows ) {
          /* shortcut Y scaling if possible */
          tempxelrow = xelrow = (QRgb*)src.scanLine(rowsread++);
      } else {
          while ( fracrowleft < fracrowtofill ) {
            if ( needtoreadrow && rowsread < rows )
                xelrow = (QRgb*)src.scanLine(rowsread++);
            for ( col = 0, xP = xelrow; col < cols; ++col, ++xP ) {
                if (as) {
                  as[col] += fracrowleft * qAlpha( *xP );
                  rs[col] += fracrowleft * qRed( *xP ) * qAlpha( *xP ) / 255;
                  gs[col] += fracrowleft * qGreen( *xP ) * qAlpha( *xP ) / 255;
                  bs[col] += fracrowleft * qBlue( *xP ) * qAlpha( *xP ) / 255;
                } else {
                  rs[col] += fracrowleft * qRed( *xP );
                  gs[col] += fracrowleft * qGreen( *xP );
                  bs[col] += fracrowleft * qBlue( *xP );
                }
            }
            fracrowtofill -= fracrowleft;
            fracrowleft = syscale;
            needtoreadrow = 1;
          }
          /* Now fracrowleft is >= fracrowtofill, so we can produce a row. */
          if ( needtoreadrow && rowsread < rows ) {
            xelrow = (QRgb*)src.scanLine(rowsread++);
            needtoreadrow = 0;
          }
          register long a=0;
          for ( col = 0, xP = xelrow, nxP = tempxelrow;
              col < cols; ++col, ++xP, ++nxP )
          {
            register long r, g, b;

            if ( as ) {
                r = rs[col] + fracrowtofill * qRed( *xP ) * qAlpha( *xP ) / 255;
                g = gs[col] + fracrowtofill * qGreen( *xP ) * qAlpha( *xP ) / 255;
                b = bs[col] + fracrowtofill * qBlue( *xP ) * qAlpha( *xP ) / 255;
                a = as[col] + fracrowtofill * qAlpha( *xP );
                if ( a ) {
                  r = r * 255 / a * SCALE;
                  g = g * 255 / a * SCALE;
                  b = b * 255 / a * SCALE;
                }
            } else {
                r = rs[col] + fracrowtofill * qRed( *xP );
                g = gs[col] + fracrowtofill * qGreen( *xP );
                b = bs[col] + fracrowtofill * qBlue( *xP );
            }
            r /= SCALE;
            if ( r > maxval ) r = maxval;
            g /= SCALE;
            if ( g > maxval ) g = maxval;
            b /= SCALE;
            if ( b > maxval ) b = maxval;
            if ( as ) {
                a /= SCALE;
                if ( a > maxval ) a = maxval;
                *nxP = qRgba( (int)r, (int)g, (int)b, (int)a );
                as[col] = HALFSCALE;
            } else {
                *nxP = qRgb( (int)r, (int)g, (int)b );
            }
            rs[col] = gs[col] = bs[col] = HALFSCALE;
          }
          fracrowleft -= fracrowtofill;
          if ( fracrowleft == 0 ) {
            fracrowleft = syscale;
            needtoreadrow = 1;
          }
          fracrowtofill = SCALE;
      }

      /* Now scale X from tempxelrow into dst and write it out. */
      if ( newcols == cols ) {
          /* shortcut X scaling if possible */
          memcpy(dst.scanLine(rowswritten++), tempxelrow, newcols*4);
      } else {
          register long a, r, g, b;
          register long fraccoltofill, fraccolleft = 0;
          register int needcol;

          nxP = (QRgb*)dst.scanLine(rowswritten++);
          fraccoltofill = SCALE;
          a = r = g = b = HALFSCALE;
          needcol = 0;
          for ( col = 0, xP = tempxelrow; col < cols; ++col, ++xP ) {
            fraccolleft = sxscale;
            while ( fraccolleft >= fraccoltofill ) {
                if ( needcol ) {
                  ++nxP;
                  a = r = g = b = HALFSCALE;
                }
                if ( as ) {
                  r += fraccoltofill * qRed( *xP ) * qAlpha( *xP ) / 255;
                  g += fraccoltofill * qGreen( *xP ) * qAlpha( *xP ) / 255;
                  b += fraccoltofill * qBlue( *xP ) * qAlpha( *xP ) / 255;
                  a += fraccoltofill * qAlpha( *xP );
                  if ( a ) {
                      r = r * 255 / a * SCALE;
                      g = g * 255 / a * SCALE;
                      b = b * 255 / a * SCALE;
                  }
                } else {
                  r += fraccoltofill * qRed( *xP );
                  g += fraccoltofill * qGreen( *xP );
                  b += fraccoltofill * qBlue( *xP );
                }
                r /= SCALE;
                if ( r > maxval ) r = maxval;
                g /= SCALE;
                if ( g > maxval ) g = maxval;
                b /= SCALE;
                if ( b > maxval ) b = maxval;
                if (as) {
                  a /= SCALE;
                  if ( a > maxval ) a = maxval;
                  *nxP = qRgba( (int)r, (int)g, (int)b, (int)a );
                } else {
                  *nxP = qRgb( (int)r, (int)g, (int)b );
                }
                fraccolleft -= fraccoltofill;
                fraccoltofill = SCALE;
                needcol = 1;
            }
            if ( fraccolleft > 0 ) {
                if ( needcol ) {
                  ++nxP;
                  a = r = g = b = HALFSCALE;
                  needcol = 0;
                }
                if (as) {
                  a += fraccolleft * qAlpha( *xP );
                  r += fraccolleft * qRed( *xP ) * qAlpha( *xP ) / 255;
                  g += fraccolleft * qGreen( *xP ) * qAlpha( *xP ) / 255;
                  b += fraccolleft * qBlue( *xP ) * qAlpha( *xP ) / 255;
                } else {
                  r += fraccolleft * qRed( *xP );
                  g += fraccolleft * qGreen( *xP );
                  b += fraccolleft * qBlue( *xP );
                }
                fraccoltofill -= fraccolleft;
            }
          }
          if ( fraccoltofill > 0 ) {
            --xP;
            if (as) {
                a += fraccolleft * qAlpha( *xP );
                r += fraccoltofill * qRed( *xP ) * qAlpha( *xP ) / 255;
                g += fraccoltofill * qGreen( *xP ) * qAlpha( *xP ) / 255;
                b += fraccoltofill * qBlue( *xP ) * qAlpha( *xP ) / 255;
                if ( a ) {
                  r = r * 255 / a * SCALE;
                  g = g * 255 / a * SCALE;
                  b = b * 255 / a * SCALE;
                }
            } else {
                r += fraccoltofill * qRed( *xP );
                g += fraccoltofill * qGreen( *xP );
                b += fraccoltofill * qBlue( *xP );
            }
          }
          if ( ! needcol ) {
            r /= SCALE;
            if ( r > maxval ) r = maxval;
            g /= SCALE;
            if ( g > maxval ) g = maxval;
            b /= SCALE;
            if ( b > maxval ) b = maxval;
            if (as) {
                a /= SCALE;
                if ( a > maxval ) a = maxval;
                *nxP = qRgba( (int)r, (int)g, (int)b, (int)a );
            } else {
                *nxP = qRgb( (int)r, (int)g, (int)b );
            }
          }
      }
    }

    if ( newrows != rows && tempxelrow )// Robust, tempxelrow might be 0 1 day
      delete [] tempxelrow;
    if ( as )                       // Avoid purify complaint
      delete [] as;
    if ( rs )                       // Robust, rs might be 0 one day
      delete [] rs;
    if ( gs )                       // Robust, gs might be 0 one day
      delete [] gs;
    if ( bs )                       // Robust, bs might be 0 one day
      delete [] bs;
}
#endif

/*!
    \enum QImage::ScaleMode

    The functions scale() and smoothScale() use different modes for
    scaling the image. The purpose of these modes is to retain the
    ratio of the image if this is required.

    \img scaling.png

    \value ScaleFree The image is scaled freely: the resulting image
      fits exactly into the specified size; the ratio will not
      necessarily be preserved.
    \value ScaleMin The ratio of the image is preserved and the
      resulting image is guaranteed to fit into the specified size
      (it is as large as possible within these constraints) - the
      image might be smaller than the requested size.
    \value ScaleMax The ratio of the image is preserved and the
      resulting image fills the whole specified rectangle (it is as
      small as possible within these constraints) - the image might
      be larger than the requested size.
*/

#ifndef QT_NO_IMAGE_SMOOTHSCALE
/*!
    Returns a smoothly scaled copy of the image. The returned image
    has a size of width \a w by height \a h pixels if \a mode is \c
    ScaleFree. The modes \c ScaleMin and \c ScaleMax may be used to
    preserve the ratio of the image: if \a mode is \c ScaleMin, the
    returned image is guaranteed to fit into the rectangle specified
    by \a w and \a h (it is as large as possible within the
    constraints); if \a mode is \c ScaleMax, the returned image fits
    at least into the specified rectangle (it is a small as possible
    within the constraints).

    For 32-bpp images and 1-bpp/8-bpp color images the result will be
    32-bpp, whereas \link allGray() all-gray \endlink images
    (including black-and-white 1-bpp) will produce 8-bit \link
    isGrayscale() grayscale \endlink images with the palette spanning
    256 grays from black to white.

    This function uses code based on pnmscale.c by Jef Poskanzer.

    pnmscale.c - read a portable anymap and scale it

    \legalese

    Copyright (C) 1989, 1991 by Jef Poskanzer.

    Permission to use, copy, modify, and distribute this software and
    its documentation for any purpose and without fee is hereby
    granted, provided that the above copyright notice appear in all
    copies and that both that copyright notice and this permission
    notice appear in supporting documentation. This software is
    provided "as is" without express or implied warranty.

    \sa scale() mirror()
*/
02773 QImage QImage::smoothScale( int w, int h, ScaleMode mode ) const
{
    return smoothScale( QSize( w, h ), mode );
}
#endif

#ifndef QT_NO_IMAGE_SMOOTHSCALE
/*!
    \overload

    The requested size of the image is \a s.
*/
02785 QImage QImage::smoothScale( const QSize& s, ScaleMode mode ) const
{
    if ( isNull() ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::smoothScale: Image is a null image" );
#endif
      return copy();
    }

    QSize newSize = size();
    newSize.scale( s, (QSize::ScaleMode)mode ); // ### remove cast in Qt 4.0
    if ( newSize == size() )
      return copy();

    if ( depth() == 32 ) {
      QImage img( newSize, 32 );
      // 32-bpp to 32-bpp
      pnmscale( *this, img );
      return img;
    } else if ( depth() != 16 && allGray() && !hasAlphaBuffer() ) {
      // Inefficient
      return convertDepth(32).smoothScale(newSize, mode).convertDepth(8);
    } else {
      // Inefficient
      return convertDepth(32).smoothScale(newSize, mode);
    }
}
#endif

/*!
    Returns a copy of the image scaled to a rectangle of width \a w
    and height \a h according to the ScaleMode \a mode.

    \list
    \i If \a mode is \c ScaleFree, the image is scaled to (\a w,
       \a h).
    \i If \a mode is \c ScaleMin, the image is scaled to a rectangle
       as large as possible inside (\a w, \a h), preserving the aspect
       ratio.
    \i If \a mode is \c ScaleMax, the image is scaled to a rectangle
       as small as possible outside (\a w, \a h), preserving the aspect
       ratio.
    \endlist

    If either the width \a w or the height \a h is 0 or negative, this
    function returns a \link isNull() null\endlink image.

    This function uses a simple, fast algorithm. If you need better
    quality, use smoothScale() instead.

    \sa scaleWidth() scaleHeight() smoothScale() xForm()
*/
#ifndef QT_NO_IMAGE_TRANSFORMATION
02838 QImage QImage::scale( int w, int h, ScaleMode mode ) const
{
    return scale( QSize( w, h ), mode );
}
#endif

/*!
    \overload

    The requested size of the image is \a s.
*/
#ifndef QT_NO_IMAGE_TRANSFORMATION
02850 QImage QImage::scale( const QSize& s, ScaleMode mode ) const
{
    if ( isNull() ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::scale: Image is a null image" );
#endif
      return copy();
    }
    if ( s.isEmpty() )
      return QImage();

    QSize newSize = size();
    newSize.scale( s, (QSize::ScaleMode)mode ); // ### remove cast in Qt 4.0
    if ( newSize == size() )
      return copy();

    QImage img;
    QWMatrix wm;
    wm.scale( (double)newSize.width() / width(), (double)newSize.height() / height() );
    img = xForm( wm );
    // ### I should test and resize the image if it has not the right size
//    if ( img.width() != newSize.width() || img.height() != newSize.height() )
//    img.resize( newSize.width(), newSize.height() );
    return img;
}
#endif

/*!
    Returns a scaled copy of the image. The returned image has a width
    of \a w pixels. This function automatically calculates the height
    of the image so that the ratio of the image is preserved.

    If \a w is 0 or negative a \link isNull() null\endlink image is
    returned.

    \sa scale() scaleHeight() smoothScale() xForm()
*/
#ifndef QT_NO_IMAGE_TRANSFORMATION
02888 QImage QImage::scaleWidth( int w ) const
{
    if ( isNull() ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::scaleWidth: Image is a null image" );
#endif
      return copy();
    }
    if ( w <= 0 )
      return QImage();

    QWMatrix wm;
    double factor = (double) w / width();
    wm.scale( factor, factor );
    return xForm( wm );
}
#endif

/*!
    Returns a scaled copy of the image. The returned image has a
    height of \a h pixels. This function automatically calculates the
    width of the image so that the ratio of the image is preserved.

    If \a h is 0 or negative a \link isNull() null\endlink image is
    returned.

    \sa scale() scaleWidth() smoothScale() xForm()
*/
#ifndef QT_NO_IMAGE_TRANSFORMATION
02917 QImage QImage::scaleHeight( int h ) const
{
    if ( isNull() ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImage::scaleHeight: Image is a null image" );
#endif
      return copy();
    }
    if ( h <= 0 )
      return QImage();

    QWMatrix wm;
    double factor = (double) h / height();
    wm.scale( factor, factor );
    return xForm( wm );
}
#endif


/*!
    Returns a copy of the image that is transformed using the
    transformation matrix, \a matrix.

    The transformation \a matrix is internally adjusted to compensate
    for unwanted translation, i.e. xForm() returns the smallest image
    that contains all the transformed points of the original image.

    \sa scale() QPixmap::xForm() QPixmap::trueMatrix() QWMatrix
*/
#ifndef QT_NO_IMAGE_TRANSFORMATION
02947 QImage QImage::xForm( const QWMatrix &matrix ) const
{
    // This function uses the same algorithm as (and steals quite some
    // code from) QPixmap::xForm().

    if ( isNull() )
      return copy();

    if ( depth() == 16 ) {
      // inefficient
      return convertDepth( 32 ).xForm( matrix );
    }

    // source image data
    int ws = width();
    int hs = height();
    int sbpl = bytesPerLine();
    uchar *sptr = bits();

    // target image data
    int wd;
    int hd;

    int bpp = depth();

    // compute size of target image
    QWMatrix mat = QPixmap::trueMatrix( matrix, ws, hs );
    if ( mat.m12() == 0.0F && mat.m21() == 0.0F ) {
      if ( mat.m11() == 1.0F && mat.m22() == 1.0F ) // identity matrix
          return copy();
      hd = qRound( mat.m22() * hs );
      wd = qRound( mat.m11() * ws );
      hd = QABS( hd );
      wd = QABS( wd );
    } else {                              // rotation or shearing
      QPointArray a( QRect(0, 0, ws, hs) );
      a = mat.map( a );
      QRect r = a.boundingRect().normalize();
      wd = r.width();
      hd = r.height();
    }

    bool invertible;
    mat = mat.invert( &invertible );            // invert matrix
    if ( hd == 0 || wd == 0 || !invertible )    // error, return null image
      return QImage();

    // create target image (some of the code is from QImage::copy())
    QImage dImage( wd, hd, depth(), numColors(), bitOrder() );

    // If the image allocation failed, we need to gracefully abort.
    if (dImage.isNull())
        return dImage;

    memcpy( dImage.colorTable(), colorTable(), numColors()*sizeof(QRgb) );
    dImage.setAlphaBuffer( hasAlphaBuffer() );
    dImage.data->dpmx = dotsPerMeterX();
    dImage.data->dpmy = dotsPerMeterY();

    switch ( bpp ) {
      // initizialize the data
      case 1:
          memset( dImage.bits(), 0, dImage.numBytes() );
          break;
      case 8:
          if ( dImage.data->ncols < 256 ) {
            // colors are left in the color table, so pick that one as transparent
            dImage.setNumColors( dImage.data->ncols+1 );
            dImage.setColor( dImage.data->ncols-1, 0x00 );
            memset( dImage.bits(), dImage.data->ncols-1, dImage.numBytes() );
          } else {
            memset( dImage.bits(), 0, dImage.numBytes() );
          }
          break;
      case 16:
          memset( dImage.bits(), 0xff, dImage.numBytes() );
          break;
      case 32:
          memset( dImage.bits(), 0x00, dImage.numBytes() );
          break;
    }

    int type;
    if ( bitOrder() == BigEndian )
      type = QT_XFORM_TYPE_MSBFIRST;
    else
      type = QT_XFORM_TYPE_LSBFIRST;
    int dbpl = dImage.bytesPerLine();
    qt_xForm_helper( mat, 0, type, bpp, dImage.bits(), dbpl, 0, hd, sptr, sbpl,
                 ws, hs );
    return dImage;
}
#endif

/*!
    Builds and returns a 1-bpp mask from the alpha buffer in this
    image. Returns a \link isNull() null\endlink image if \link
    setAlphaBuffer() alpha buffer mode\endlink is disabled.

    See QPixmap::convertFromImage() for a description of the \a
    conversion_flags argument.

    The returned image has little-endian bit order, which you can
    convert to big-endianness using convertBitOrder().

    \sa createHeuristicMask() hasAlphaBuffer() setAlphaBuffer()
*/
#ifndef QT_NO_IMAGE_DITHER_TO_1
03055 QImage QImage::createAlphaMask( int conversion_flags ) const
{
    if ( conversion_flags == 1 ) {
      // Old code is passing "TRUE".
      conversion_flags = Qt::DiffuseAlphaDither;
    }

    if ( isNull() || !hasAlphaBuffer() )
      return QImage();

    if ( depth() == 1 ) {
      // A monochrome pixmap, with alpha channels on those two colors.
      // Pretty unlikely, so use less efficient solution.
      return convertDepth(8, conversion_flags)
            .createAlphaMask( conversion_flags );
    }

    QImage mask1;
    dither_to_1( this, &mask1, conversion_flags, TRUE );
    return mask1;
}
#endif

#ifndef QT_NO_IMAGE_HEURISTIC_MASK
/*!
    Creates and returns a 1-bpp heuristic mask for this image. It
    works by selecting a color from one of the corners, then chipping
    away pixels of that color starting at all the edges.

    The four corners vote for which color is to be masked away. In
    case of a draw (this generally means that this function is not
    applicable to the image), the result is arbitrary.

    The returned image has little-endian bit order, which you can
    convert to big-endianness using convertBitOrder().

    If \a clipTight is TRUE the mask is just large enough to cover the
    pixels; otherwise, the mask is larger than the data pixels.

    This function disregards the \link hasAlphaBuffer() alpha buffer
    \endlink.

    \sa createAlphaMask()
*/

03100 QImage QImage::createHeuristicMask( bool clipTight ) const
{
    if ( isNull() ) {
      QImage nullImage;
      return nullImage;
    }
    if ( depth() != 32 ) {
      QImage img32 = convertDepth(32);
      return img32.createHeuristicMask(clipTight);
    }

#define PIX(x,y)  (*((QRgb*)scanLine(y)+x) & 0x00ffffff)

    int w = width();
    int h = height();
    QImage m(w, h, 1, 2, QImage::LittleEndian);
    m.setColor( 0, 0xffffff );
    m.setColor( 1, 0 );
    m.fill( 0xff );

    QRgb background = PIX(0,0);
    if ( background != PIX(w-1,0) &&
       background != PIX(0,h-1) &&
       background != PIX(w-1,h-1) ) {
      background = PIX(w-1,0);
      if ( background != PIX(w-1,h-1) &&
           background != PIX(0,h-1) &&
           PIX(0,h-1) == PIX(w-1,h-1) ) {
          background = PIX(w-1,h-1);
      }
    }

    int x,y;
    bool done = FALSE;
    uchar *ypp, *ypc, *ypn;
    while( !done ) {
      done = TRUE;
      ypn = m.scanLine(0);
      ypc = 0;
      for ( y = 0; y < h; y++ ) {
          ypp = ypc;
          ypc = ypn;
          ypn = (y == h-1) ? 0 : m.scanLine(y+1);
          QRgb *p = (QRgb *)scanLine(y);
          for ( x = 0; x < w; x++ ) {
            // slowness here - it's possible to do six of these tests
            // together in one go. oh well.
            if ( ( x == 0 || y == 0 || x == w-1 || y == h-1 ||
                   !(*(ypc + ((x-1) >> 3)) & (1 << ((x-1) & 7))) ||
                   !(*(ypc + ((x+1) >> 3)) & (1 << ((x+1) & 7))) ||
                   !(*(ypp + (x     >> 3)) & (1 << (x     & 7))) ||
                   !(*(ypn + (x     >> 3)) & (1 << (x     & 7))) ) &&
                 (      (*(ypc + (x     >> 3)) & (1 << (x     & 7))) ) &&
                 ( (*p & 0x00ffffff) == background ) ) {
                done = FALSE;
                *(ypc + (x >> 3)) &= ~(1 << (x & 7));
            }
            p++;
          }
      }
    }

    if ( !clipTight ) {
      ypn = m.scanLine(0);
      ypc = 0;
      for ( y = 0; y < h; y++ ) {
          ypp = ypc;
          ypc = ypn;
          ypn = (y == h-1) ? 0 : m.scanLine(y+1);
          QRgb *p = (QRgb *)scanLine(y);
          for ( x = 0; x < w; x++ ) {
            if ( (*p & 0x00ffffff) != background ) {
                if ( x > 0 )
                  *(ypc + ((x-1) >> 3)) |= (1 << ((x-1) & 7));
                if ( x < w-1 )
                  *(ypc + ((x+1) >> 3)) |= (1 << ((x+1) & 7));
                if ( y > 0 )
                  *(ypp + (x >> 3)) |= (1 << (x & 7));
                if ( y < h-1 )
                  *(ypn + (x >> 3)) |= (1 << (x & 7));
            }
            p++;
          }
      }
    }

#undef PIX

    return m;
}
#endif //QT_NO_IMAGE_HEURISTIC_MASK

#ifndef QT_NO_IMAGE_MIRROR
/*
  This code is contributed by Philipp Lang,
  GeneriCom Software Germany (www.generi.com)
  under the terms of the QPL, Version 1.0
*/

/*!
    \overload

    Returns a mirror of the image, mirrored in the horizontal and/or
    the vertical direction depending on whether \a horizontal and \a
    vertical are set to TRUE or FALSE. The original image is not
    changed.

    \sa smoothScale()
*/
03209 QImage QImage::mirror(bool horizontal, bool vertical) const
{
    int w = width();
    int h = height();
    if ( (w <= 1 && h <= 1) || (!horizontal && !vertical) )
      return copy();

    // Create result image, copy colormap
    QImage result(w, h, depth(), numColors(), bitOrder());
    memcpy(result.colorTable(), colorTable(), numColors()*sizeof(QRgb));
    result.setAlphaBuffer(hasAlphaBuffer());

    if (depth() == 1)
      w = (w+7)/8;
    int dxi = horizontal ? -1 : 1;
    int dxs = horizontal ? w-1 : 0;
    int dyi = vertical ? -1 : 1;
    int dy = vertical ? h-1: 0;

    // 1 bit, 8 bit
    if (depth() == 1 || depth() == 8) {
      for (int sy = 0; sy < h; sy++, dy += dyi) {
          Q_UINT8* ssl = (Q_UINT8*)(data->bits[sy]);
          Q_UINT8* dsl = (Q_UINT8*)(result.data->bits[dy]);
          int dx = dxs;
          for (int sx = 0; sx < w; sx++, dx += dxi)
            dsl[dx] = ssl[sx];
      }
    }
#ifndef QT_NO_IMAGE_TRUECOLOR
#ifndef QT_NO_IMAGE_16_BIT
    // 16 bit
    else if (depth() == 16) {
      for (int sy = 0; sy < h; sy++, dy += dyi) {
          Q_UINT16* ssl = (Q_UINT16*)(data->bits[sy]);
          Q_UINT16* dsl = (Q_UINT16*)(result.data->bits[dy]);
          int dx = dxs;
          for (int sx = 0; sx < w; sx++, dx += dxi)
            dsl[dx] = ssl[sx];
      }
    }
#endif
    // 32 bit
    else if (depth() == 32) {
      for (int sy = 0; sy < h; sy++, dy += dyi) {
          Q_UINT32* ssl = (Q_UINT32*)(data->bits[sy]);
          Q_UINT32* dsl = (Q_UINT32*)(result.data->bits[dy]);
          int dx = dxs;
          for (int sx = 0; sx < w; sx++, dx += dxi)
            dsl[dx] = ssl[sx];
      }
    }
#endif

    // special handling of 1 bit images for horizontal mirroring
    if (horizontal && depth() == 1) {
      int shift = width() % 8;
      for (int y = h-1; y >= 0; y--) {
          Q_UINT8* a0 = (Q_UINT8*)(result.data->bits[y]);
          // Swap bytes
          Q_UINT8* a = a0+dxs;
          while (a >= a0) {
            *a = bitflip[*a];
            a--;
          }
          // Shift bits if unaligned
          if (shift != 0) {
            a = a0+dxs;
            Q_UINT8 c = 0;
            if (bitOrder() == QImage::LittleEndian) {
                while (a >= a0) {
                  Q_UINT8 nc = *a << shift;
                  *a = (*a >> (8-shift)) | c;
                  --a;
                  c = nc;
                }
            } else {
                while (a >= a0) {
                  Q_UINT8 nc = *a >> shift;
                  *a = (*a << (8-shift)) | c;
                  --a;
                  c = nc;
                }
            }
          }
      }
    }

    return result;
}

/*!
    Returns a QImage which is a vertically mirrored copy of this
    image. The original QImage is not changed.
*/

03305 QImage QImage::mirror() const
{
    return mirror(FALSE,TRUE);
}
#endif //QT_NO_IMAGE_MIRROR

/*!
    Returns a QImage in which the values of the red and blue
    components of all pixels have been swapped, effectively converting
    an RGB image to a BGR image. The original QImage is not changed.
*/

03317 QImage QImage::swapRGB() const
{
    QImage res = copy();
    if ( !isNull() ) {
#ifndef QT_NO_IMAGE_TRUECOLOR
      if ( depth() == 32 ) {
          for ( int i=0; i < height(); i++ ) {
            uint *p = (uint*)scanLine( i );
            uint *q = (uint*)res.scanLine( i );
            uint *end = p + width();
            while ( p < end ) {
                *q = ((*p << 16) & 0xff0000) | ((*p >> 16) & 0xff) |
                   (*p & 0xff00ff00);
                p++;
                q++;
            }
          }
#ifndef QT_NO_IMAGE_16_BIT
      } else if ( depth() == 16 ) {
          qWarning( "QImage::swapRGB not implemented for 16bpp" );
#endif
      } else
#endif //QT_NO_IMAGE_TRUECOLOR
          {
          uint* p = (uint*)colorTable();
          uint* q = (uint*)res.colorTable();
          if ( p && q ) {
            for ( int i=0; i < numColors(); i++ ) {
                *q = ((*p << 16) & 0xff0000) | ((*p >> 16) & 0xff) |
                   (*p & 0xff00ff00);
                p++;
                q++;
            }
          }
      }
    }
    return res;
}

#ifndef QT_NO_IMAGEIO
/*!
    Returns a string that specifies the image format of the file \a
    fileName, or 0 if the file cannot be read or if the format is not
    recognized.

    The QImageIO documentation lists the guaranteed supported image
    formats, or use QImage::inputFormats() and QImage::outputFormats()
    to get lists that include the installed formats.

    \sa load() save()
*/

03369 const char* QImage::imageFormat( const QString &fileName )
{
    return QImageIO::imageFormat( fileName );
}

/*!
    Returns a list of image formats that are supported for image
    input.

    \sa outputFormats() inputFormatList() QImageIO
*/
03380 QStrList QImage::inputFormats()
{
    return QImageIO::inputFormats();
}
#ifndef QT_NO_STRINGLIST
/*!
    Returns a list of image formats that are supported for image
    input.

    Note that if you want to iterate over the list, you should iterate
    over a copy, e.g.
    \code
    QStringList list = myImage.inputFormatList();
    QStringList::Iterator it = list.begin();
    while( it != list.end() ) {
      myProcessing( *it );
      ++it;
    }
    \endcode

    \sa outputFormatList() inputFormats() QImageIO
*/
03402 QStringList QImage::inputFormatList()
{
    return QStringList::fromStrList(QImageIO::inputFormats());
}


/*!
    Returns a list of image formats that are supported for image
    output.

    Note that if you want to iterate over the list, you should iterate
    over a copy, e.g.
    \code
    QStringList list = myImage.outputFormatList();
    QStringList::Iterator it = list.begin();
    while( it != list.end() ) {
      myProcessing( *it );
      ++it;
    }
    \endcode

    \sa inputFormatList() outputFormats() QImageIO
*/
03425 QStringList QImage::outputFormatList()
{
    return QStringList::fromStrList(QImageIO::outputFormats());
}
#endif //QT_NO_STRINGLIST

/*!
    Returns a list of image formats that are supported for image
    output.

    \sa inputFormats() outputFormatList() QImageIO
*/
03437 QStrList QImage::outputFormats()
{
    return QImageIO::outputFormats();
}


/*!
    Loads an image from the file \a fileName. Returns TRUE if the
    image was successfully loaded; otherwise returns FALSE.

    If \a format is specified, the loader attempts to read the image
    using the specified format. If \a format is not specified (which
    is the default), the loader reads a few bytes from the header to
    guess the file format.

    The QImageIO documentation lists the supported image formats and
    explains how to add extra formats.

    \sa loadFromData() save() imageFormat() QPixmap::load() QImageIO
*/

03458 bool QImage::load( const QString &fileName, const char* format )
{
    QImageIO io( fileName, format );
    bool result = io.read();
    if ( result )
      operator=( io.image() );
    return result;
}

/*!
    Loads an image from the first \a len bytes of binary data in \a
    buf. Returns TRUE if the image was successfully loaded; otherwise
    returns FALSE.

    If \a format is specified, the loader attempts to read the image
    using the specified format. If \a format is not specified (which
    is the default), the loader reads a few bytes from the header to
    guess the file format.

    The QImageIO documentation lists the supported image formats and
    explains how to add extra formats.

    \sa load() save() imageFormat() QPixmap::loadFromData() QImageIO
*/

03483 bool QImage::loadFromData( const uchar *buf, uint len, const char *format )
{
    QByteArray a;
    a.setRawData( (char *)buf, len );
    QBuffer b( a );
    b.open( IO_ReadOnly );
    QImageIO io( &b, format );
    bool result = io.read();
    b.close();
    a.resetRawData( (char *)buf, len );
    if ( result )
      operator=( io.image() );
    return result;
}

/*!
    \overload

    Loads an image from the QByteArray \a buf.
*/
03503 bool QImage::loadFromData( QByteArray buf, const char *format )
{
    return loadFromData( (const uchar *)(buf.data()), buf.size(), format );
}

/*!
    Saves the image to the file \a fileName, using the image file
    format \a format and a quality factor of \a quality. \a quality
    must be in the range 0..100 or -1. Specify 0 to obtain small
    compressed files, 100 for large uncompressed files, and -1 (the
    default) to use the default settings.

    Returns TRUE if the image was successfully saved; otherwise
    returns FALSE.

    \sa load() loadFromData() imageFormat() QPixmap::save() QImageIO
*/

03521 bool QImage::save( const QString &fileName, const char* format, int quality ) const
{
    if ( isNull() )
      return FALSE;                       // nothing to save
    QImageIO io( fileName, format );
    return doImageIO( &io, quality );
}

/*!
    \overload

    This function writes a QImage to the QIODevice, \a device. This
    can be used, for example, to save an image directly into a
    QByteArray:
    \code
    QImage image;
    QByteArray ba;
    QBuffer buffer( ba );
    buffer.open( IO_WriteOnly );
    image.save( &buffer, "PNG" ); // writes image into ba in PNG format
    \endcode
*/

03544 bool QImage::save( QIODevice* device, const char* format, int quality ) const
{
    if ( isNull() )
      return FALSE;                       // nothing to save
    QImageIO io( device, format );
    return doImageIO( &io, quality );
}

/* \internal
*/

bool QImage::doImageIO( QImageIO* io, int quality ) const
{
    if ( !io )
      return FALSE;
    io->setImage( *this );
#if defined(QT_CHECK_RANGE)
    if ( quality > 100  || quality < -1 )
      qWarning( "QPixmap::save: quality out of range [-1,100]" );
#endif
    if ( quality >= 0 )
      io->setQuality( QMIN(quality,100) );
    return io->write();
}
#endif //QT_NO_IMAGEIO

/*****************************************************************************
  QImage stream functions
 *****************************************************************************/
#if !defined(QT_NO_DATASTREAM) && !defined(QT_NO_IMAGEIO)
/*!
    \relates QImage

    Writes the image \a image to the stream \a s as a PNG image, or as a
    BMP image if the stream's version is 1.

    Note that writing the stream to a file will not produce a valid image file.

    \sa QImage::save()
    \link datastreamformat.html Format of the QDataStream operators \endlink
*/

03586 QDataStream &operator<<( QDataStream &s, const QImage &image )
{
    if ( s.version() >= 5 ) {
      if ( image.isNull() ) {
          s << (Q_INT32) 0; // null image marker
          return s;
      } else {
          s << (Q_INT32) 1;
          // continue ...
      }
    }
    QImageIO io;
    io.setIODevice( s.device() );
    if ( s.version() == 1 )
      io.setFormat( "BMP" );
    else
      io.setFormat( "PNG" );

    io.setImage( image );
    io.write();
    return s;
}

/*!
    \relates QImage

    Reads an image from the stream \a s and stores it in \a image.

    \sa QImage::load()
    \link datastreamformat.html Format of the QDataStream operators \endlink
*/

03618 QDataStream &operator>>( QDataStream &s, QImage &image )
{
    if ( s.version() >= 5 ) {
      Q_INT32 nullMarker;
      s >> nullMarker;
      if ( !nullMarker ) {
          image = QImage(); // null image
          return s;
      }
    }
    QImageIO io( s.device(), 0 );
    if ( io.read() )
      image = io.image();
    return s;
}
#endif

/*****************************************************************************
  Standard image io handlers (defined below)
 *****************************************************************************/

// standard image io handlers (defined below)
#ifndef QT_NO_IMAGEIO_BMP
static void read_bmp_image( QImageIO * );
static void write_bmp_image( QImageIO * );
#endif
#ifndef QT_NO_IMAGEIO_PPM
static void read_pbm_image( QImageIO * );
static void write_pbm_image( QImageIO * );
#endif
#ifndef QT_NO_IMAGEIO_XBM
static void read_xbm_image( QImageIO * );
static void write_xbm_image( QImageIO * );
#endif
#ifndef QT_NO_IMAGEIO_XPM
static void read_xpm_image( QImageIO * );
static void write_xpm_image( QImageIO * );
#endif

#ifndef QT_NO_ASYNC_IMAGE_IO
static void read_async_image( QImageIO * ); // Not in table of handlers
#endif

/*****************************************************************************
  Misc. utility functions
 *****************************************************************************/
#if !defined(QT_NO_IMAGEIO_XPM) || !defined(QT_NO_IMAGEIO_XBM)
static QString fbname( const QString &fileName ) // get file basename (sort of)
{
    QString s = fileName;
    if ( !s.isEmpty() ) {
      int i;
      if ( (i = s.findRev('/')) >= 0 )
          s = s.mid( i );
      if ( (i = s.findRev('\\')) >= 0 )
          s = s.mid( i );
      QRegExp r( QString::fromLatin1("[a-zA-Z][a-zA-Z0-9_]*") );
      int p = r.search( s );
      if ( p == -1 )
          s.truncate( 0 );
      else
          s = s.mid( p, r.matchedLength() );
    }
    if ( s.isEmpty() )
      s = QString::fromLatin1( "dummy" );
    return s;
}
#endif

#ifndef QT_NO_IMAGEIO_BMP
static void swapPixel01( QImage *image )  // 1-bpp: swap 0 and 1 pixels
{
    int i;
    if ( image->depth() == 1 && image->numColors() == 2 ) {
      register uint *p = (uint *)image->bits();
      int nbytes = image->numBytes();
      for ( i=0; i<nbytes/4; i++ ) {
          *p = ~*p;
          p++;
      }
      uchar *p2 = (uchar *)p;
      for ( i=0; i<(nbytes&3); i++ ) {
          *p2 = ~*p2;
          p2++;
      }
      QRgb t = image->color(0);           // swap color 0 and 1
      image->setColor( 0, image->color(1) );
      image->setColor( 1, t );
    }
}
#endif


/*****************************************************************************
  QImageIO member functions
 *****************************************************************************/

/*!
    \class QImageIO qimage.h

    \brief The QImageIO class contains parameters for loading and
    saving images.

    \ingroup images
    \ingroup graphics
    \ingroup io

    QImageIO contains a QIODevice object that is used for image data
    I/O. The programmer can install new image file formats in addition
    to those that Qt provides.

    Qt currently supports the following image file formats: PNG, BMP,
    XBM, XPM and PNM. It may also support JPEG, MNG and GIF, if
    specially configured during compilation. The different PNM formats
    are: PBM (P1 or P4), PGM (P2 or P5), and PPM (P3 or P6).

    You don't normally need to use this class; QPixmap::load(),
    QPixmap::save(), and QImage contain sufficient functionality.

    For image files that contain sequences of images, only the first
    is read. See QMovie for loading multiple images.

    PBM, PGM, and PPM format \e output is always in the more condensed
    raw format. PPM and PGM files with more than 256 levels of
    intensity are scaled down when reading.

    \warning If you are in a country which recognizes software patents
    and in which Unisys holds a patent on LZW compression and/or
    decompression and you want to use GIF, Unisys may require you to
    license the technology. Such countries include Canada, Japan, the
    USA, France, Germany, Italy and the UK.

    GIF support may be removed completely in a future version of Qt.
    We recommend using the PNG format.

    \sa QImage QPixmap QFile QMovie
*/

#ifndef QT_NO_IMAGEIO
struct QImageIOData
{
    const char *parameters;
    int quality;
    float gamma;
};

/*!
    Constructs a QImageIO object with all parameters set to zero.
*/

03768 QImageIO::QImageIO()
{
    init();
}

/*!
    Constructs a QImageIO object with the I/O device \a ioDevice and a
    \a format tag.
*/

03778 QImageIO::QImageIO( QIODevice *ioDevice, const char *format )
    : frmt(format)
{
    init();
    iodev  = ioDevice;
}

/*!
    Constructs a QImageIO object with the file name \a fileName and a
    \a format tag.
*/

03790 QImageIO::QImageIO( const QString &fileName, const char* format )
    : frmt(format), fname(fileName)
{
    init();
}

/*!
    Contains initialization common to all QImageIO constructors.
*/

03800 void QImageIO::init()
{
    d = new QImageIOData();
    d->parameters = 0;
    d->quality = -1; // default quality of the current format
    d->gamma=0.0f;
    iostat = 0;
    iodev  = 0;
}

/*!
    Destroys the object and all related data.
*/

03814 QImageIO::~QImageIO()
{
    if ( d->parameters )
      delete [] (char*)d->parameters;
    delete d;
}


/*****************************************************************************
  QImageIO image handler functions
 *****************************************************************************/

class QImageHandler
{
public:
    QImageHandler( const char *f, const char *h, const QCString& fl,
               image_io_handler r, image_io_handler w );
    QCString            format;                 // image format
    QRegExp       header;                 // image header pattern
    enum TMode { Untranslated=0, TranslateIn, TranslateInOut } text_mode;
    image_io_handler  read_image;         // image read function
    image_io_handler  write_image;        // image write function
    bool          obsolete;               // support not "published"
};

QImageHandler::QImageHandler( const char *f, const char *h, const QCString& fl,
                        image_io_handler r, image_io_handler w )
    : format(f), header(QString::fromLatin1(h))
{
    text_mode = Untranslated;
    if ( fl.contains('t') )
      text_mode = TranslateIn;
    else if ( fl.contains('T') )
      text_mode = TranslateInOut;
    obsolete = fl.contains('O');
    read_image    = r;
    write_image = w;
}

typedef QPtrList<QImageHandler> QIHList;// list of image handlers
static QIHList *imageHandlers = 0;
#ifndef QT_NO_COMPONENT
static QPluginManager<QImageFormatInterface> *plugin_manager = 0;
#else
static void *plugin_manager = 0;
#endif

void qt_init_image_plugins()
{
#ifndef QT_NO_COMPONENT
    if ( plugin_manager )
      return;

    plugin_manager = new QPluginManager<QImageFormatInterface>( IID_QImageFormat, QApplication::libraryPaths(), "/imageformats" );

    QStringList features = plugin_manager->featureList();
    QStringList::Iterator it = features.begin();
    while ( it != features.end() ) {
      QString str = *it;
      ++it;
      QInterfacePtr<QImageFormatInterface> iface;
      plugin_manager->queryInterface( str, &iface );
      if ( iface )
          iface->installIOHandler( str );
    }
#endif
}

static void cleanup()
{
    // make sure that image handlers are delete before plugin manager
    delete imageHandlers;
    imageHandlers = 0;
#ifndef QT_NO_COMPONENT
    delete plugin_manager;
    plugin_manager = 0;
#endif
}

void qt_init_image_handlers()       // initialize image handlers
{
    if ( !imageHandlers ) {
      imageHandlers = new QIHList;
      Q_CHECK_PTR( imageHandlers );
      imageHandlers->setAutoDelete( TRUE );
      qAddPostRoutine( cleanup );
#ifndef QT_NO_IMAGEIO_BMP
      QImageIO::defineIOHandler( "BMP", "^BM", 0,
                           read_bmp_image, write_bmp_image );
#endif
#ifndef QT_NO_IMAGEIO_PPM
      QImageIO::defineIOHandler( "PBM", "^P1", "t",
                           read_pbm_image, write_pbm_image );
      QImageIO::defineIOHandler( "PBMRAW", "^P4", "O",
                           read_pbm_image, write_pbm_image );
      QImageIO::defineIOHandler( "PGM", "^P2", "t",
                           read_pbm_image, write_pbm_image );
      QImageIO::defineIOHandler( "PGMRAW", "^P5", "O",
                           read_pbm_image, write_pbm_image );
      QImageIO::defineIOHandler( "PPM", "^P3", "t",
                           read_pbm_image, write_pbm_image );
      QImageIO::defineIOHandler( "PPMRAW", "^P6", "O",
                           read_pbm_image, write_pbm_image );
#endif
#ifndef QT_NO_IMAGEIO_XBM
      QImageIO::defineIOHandler( "XBM", "^((/\\*(?!.XPM.\\*/))|#define)", "T",
                           read_xbm_image, write_xbm_image );
#endif
#ifndef QT_NO_IMAGEIO_XPM
      QImageIO::defineIOHandler( "XPM", "/\\*.XPM.\\*/", "T",
                           read_xpm_image, write_xpm_image );
#endif
#ifndef QT_NO_IMAGEIO_MNG
      qInitMngIO();
#endif
#ifndef QT_NO_IMAGEIO_PNG
      qInitPngIO();
#endif
#ifndef QT_NO_IMAGEIO_JPEG
      qInitJpegIO();
#endif
    }
}

static QImageHandler *get_image_handler( const char *format )
{                                   // get pointer to handler
    qt_init_image_handlers();
    qt_init_image_plugins();
    register QImageHandler *p = imageHandlers->first();
    while ( p ) {                   // traverse list
      if ( p->format == format )
          return p;
      p = imageHandlers->next();
    }
    return 0;                             // no such handler
}


/*!
    Defines an image I/O handler for the image format called \a
    format, which is recognized using the \link qregexp.html#details
    regular expression\endlink \a header, read using \a readImage and
    written using \a writeImage.

    \a flags is a string of single-character flags for this format.
    The only flag defined currently is T (upper case), so the only
    legal value for \a flags are "T" and the empty string. The "T"
    flag means that the image file is a text file, and Qt should treat
    all newline conventions as equivalent. (XPM files and some PPM
    files are text files for example.)

    \a format is used to select a handler to write a QImage; \a header
    is used to select a handler to read an image file.

    If \a readImage is a null pointer, the QImageIO will not be able
    to read images in \a format. If \a writeImage is a null pointer,
    the QImageIO will not be able to write images in \a format. If
    both are null, the QImageIO object is valid but useless.

    Example:
    \code
      void readGIF( QImageIO *image )
      {
      // read the image using the image->ioDevice()
      }

      void writeGIF( QImageIO *image )
      {
      // write the image using the image->ioDevice()
      }

      // add the GIF image handler

      QImageIO::defineIOHandler( "GIF",
                           "^GIF[0-9][0-9][a-z]",
                           0,
                           readGIF,
                           writeGIF );
    \endcode

    Before the regex test, all the 0 bytes in the file header are
    converted to 1 bytes. This is done because when Qt was
    ASCII-based, QRegExp could not handle 0 bytes in strings.

    The regexp is only applied on the first 14 bytes of the file.

    Note that Qt assumes that there is only one handler per format; if
    two handlers support the same format, Qt will choose one
    arbitrarily. It is not possible to have one handler support
    reading, and another support writing.
*/

04006 void QImageIO::defineIOHandler( const char *format,
                        const char *header,
                        const char *flags,
                        image_io_handler readImage,
                        image_io_handler writeImage )
{
    qt_init_image_handlers();
    QImageHandler *p;
    p = new QImageHandler( format, header, flags,
                     readImage, writeImage );
    Q_CHECK_PTR( p );
    imageHandlers->insert( 0, p );
}


/*****************************************************************************
  QImageIO normal member functions
 *****************************************************************************/

/*!
    \fn const QImage &QImageIO::image() const

    Returns the image currently set.

    \sa setImage()
*/

/*!
    \fn int QImageIO::status() const

    Returns the image's IO status. A non-zero value indicates an
    error, whereas 0 means that the IO operation was successful.

    \sa setStatus()
*/

/*!
    \fn const char *QImageIO::format() const

    Returns the image format string or 0 if no format has been
    explicitly set.
*/

/*!
    \fn QIODevice *QImageIO::ioDevice() const

    Returns the IO device currently set.

    \sa setIODevice()
*/

/*!
    \fn QString QImageIO::fileName() const

    Returns the file name currently set.

    \sa setFileName()
*/

/*!
    \fn QString QImageIO::description() const

    Returns the image description string.

    \sa setDescription()
*/


/*!
    Sets the image to \a image.

    \sa image()
*/

04080 void QImageIO::setImage( const QImage &image )
{
    im = image;
}

/*!
    Sets the image IO status to \a status. A non-zero value indicates
    an error, whereas 0 means that the IO operation was successful.

    \sa status()
*/

04092 void QImageIO::setStatus( int status )
{
    iostat = status;
}

/*!
    Sets the image format to \a format for the image to be read or
    written.

    It is necessary to specify a format before writing an image, but
    it is not necessary to specify a format before reading an image.

    If no format has been set, Qt guesses the image format before
    reading it. If a format is set the image will only be read if it
    has that format.

    \sa read() write() format()
*/

04111 void QImageIO::setFormat( const char *format )
{
    frmt = format;
}

/*!
    Sets the IO device to be used for reading or writing an image.

    Setting the IO device allows images to be read/written to any
    block-oriented QIODevice.

    If \a ioDevice is not null, this IO device will override file name
    settings.

    \sa setFileName()
*/

04128 void QImageIO::setIODevice( QIODevice *ioDevice )
{
    iodev = ioDevice;
}

/*!
    Sets the name of the file to read or write an image from to \a
    fileName.

    \sa setIODevice()
*/

04140 void QImageIO::setFileName( const QString &fileName )
{
    fname = fileName;
}

/*!
    Returns the quality of the written image, related to the
    compression ratio.

    \sa setQuality() QImage::save()
*/

04152 int QImageIO::quality() const
{
    return d->quality;
}

/*!
    Sets the quality of the written image to \a q, related to the
    compression ratio.

    \a q must be in the range -1..100. Specify 0 to obtain small
    compressed files, 100 for large uncompressed files. (-1 signifies
    the default compression.)

    \sa quality() QImage::save()
*/

04168 void QImageIO::setQuality( int q )
{
    d->quality = q;
}

/*!
    Returns the image's parameters string.

    \sa setParameters()
*/

04179 const char *QImageIO::parameters() const
{
    return d->parameters;
}

/*!
    Sets the image's parameter string to \a parameters. This is for
    image handlers that require special parameters.

    Although the current image formats supported by Qt ignore the
    parameters string, it may be used in future extensions or by
    contributions (for example, JPEG).

    \sa parameters()
*/

04195 void QImageIO::setParameters( const char *parameters )
{
    if ( d && d->parameters )
      delete [] (char*)d->parameters;
    d->parameters = qstrdup( parameters );
}

/*!
    Sets the gamma value at which the image will be viewed to \a
    gamma. If the image format stores a gamma value for which the
    image is intended to be used, then this setting will be used to
    modify the image. Setting to 0.0 will disable gamma correction
    (i.e. any specification in the file will be ignored).

    The default value is 0.0.

    \sa gamma()
*/
04213 void QImageIO::setGamma( float gamma )
{
    d->gamma=gamma;
}

/*!
    Returns the gamma value at which the image will be viewed.

    \sa setGamma()
*/
04223 float QImageIO::gamma() const
{
    return d->gamma;
}

/*!
    Sets the image description string for image handlers that support
    image descriptions to \a description.

    Currently, no image format supported by Qt uses the description
    string.
*/

04236 void QImageIO::setDescription( const QString &description )
{
    descr = description;
}


/*!
    Returns a string that specifies the image format of the file \a
    fileName, or null if the file cannot be read or if the format is
    not recognized.
*/

04248 const char* QImageIO::imageFormat( const QString &fileName )
{
    QFile file( fileName );
    if ( !file.open(IO_ReadOnly) )
      return 0;
    const char* format = imageFormat( &file );
    file.close();
    return format;
}

/*!
    \overload

    Returns a string that specifies the image format of the image read
    from IO device \a d, or 0 if the device cannot be read or if the
    format is not recognized.

    Make sure that \a d is at the right position in the device (for
    example, at the beginning of the file).

    \sa QIODevice::at()
*/

04271 const char *QImageIO::imageFormat( QIODevice *d )
{
    // if you change this change the documentation for defineIOHandler()
    const int buflen = 14;

    char buf[buflen];
    char buf2[buflen];
    qt_init_image_handlers();
    qt_init_image_plugins();
    int pos = d->at();              // save position
    int rdlen = d->readBlock( buf, buflen );    // read a few bytes

    if ( rdlen != buflen )
      return 0;

    memcpy( buf2, buf, buflen );

    const char* format = 0;
    for ( int n = 0; n < rdlen; n++ )
      if ( buf[n] == '\0' )
          buf[n] = '\001';
    if ( d->status() == IO_Ok && rdlen > 0 ) {
      buf[rdlen - 1] = '\0';
      QString bufStr = QString::fromLatin1(buf);
      QImageHandler *p = imageHandlers->first();
      int bestMatch = -1;
      while ( p ) {
          if ( p->read_image && p->header.search(bufStr) != -1 ) {
            // try match with header if a read function is available
            if (p->header.matchedLength() > bestMatch) {
                // keep looking for best match
                format = p->format;
                bestMatch = p->header.matchedLength();
            }
          }
          p = imageHandlers->next();
      }
    }
    d->at( pos );                   // restore position
#ifndef QT_NO_ASYNC_IMAGE_IO
    if ( !format )
      format = QImageDecoder::formatName( (uchar*)buf2, rdlen );
#endif

    return format;
}

/*!
    Returns a sorted list of image formats that are supported for
    image input.
*/
04322 QStrList QImageIO::inputFormats()
{
    QStrList result;

    qt_init_image_handlers();
    qt_init_image_plugins();

#ifndef QT_NO_ASYNC_IMAGE_IO
    // Include asynchronous loaders first.
    result = QImageDecoder::inputFormats();
#endif

    QImageHandler *p = imageHandlers->first();
    while ( p ) {
      if ( p->read_image
          && !p->obsolete
          && !result.contains(p->format) )
      {
          result.inSort(p->format);
      }
      p = imageHandlers->next();
    }

    return result;
}

/*!
    Returns a sorted list of image formats that are supported for
    image output.
*/
04352 QStrList QImageIO::outputFormats()
{
    QStrList result;

    qt_init_image_handlers();
    qt_init_image_plugins();

    // Include asynchronous writers (!) first.
    // (None)

    QImageHandler *p = imageHandlers->first();
    while ( p ) {
      if ( p->write_image
          && !p->obsolete
          && !result.contains(p->format) )
      {
          result.inSort(p->format);
      }
      p = imageHandlers->next();
    }

    return result;
}



/*!
    Reads an image into memory and returns TRUE if the image was
    successfully read; otherwise returns FALSE.

    Before reading an image you must set an IO device or a file name.
    If both an IO device and a file name have been set, the IO device
    will be used.

    Setting the image file format string is optional.

    Note that this function does \e not set the \link format()
    format\endlink used to read the image. If you need that
    information, use the imageFormat() static functions.

    Example:

    \code
      QImageIO iio;
      QPixmap  pixmap;
      iio.setFileName( "vegeburger.bmp" );
      if ( image.read() )        // ok
          pixmap = iio.image();  // convert to pixmap
    \endcode

    \sa setIODevice() setFileName() setFormat() write() QPixmap::load()
*/

04405 bool QImageIO::read()
{
    QFile      file;
    const char      *image_format;
    QImageHandler *h;

    if ( iodev ) {                        // read from io device
      // ok, already open
    } else if ( !fname.isEmpty() ) {            // read from file
      file.setName( fname );
      if ( !file.open(IO_ReadOnly) )
          return FALSE;             // cannot open file
      iodev = &file;
    } else {                              // no file name or io device
      return FALSE;
    }
    if (frmt.isEmpty()) {
      // Try to guess format
      image_format = imageFormat( iodev );      // get image format
      if ( !image_format ) {
          if ( file.isOpen() ) {                // unknown format
            file.close();
            iodev = 0;
          }
          return FALSE;
      }
    } else {
      image_format = frmt;
    }

    h = get_image_handler( image_format );
    if ( file.isOpen() ) {
#if !defined(Q_OS_UNIX)
      if ( h && h->text_mode ) {          // reopen in translated mode
          file.close();
          file.open( IO_ReadOnly | IO_Translate );
      }
      else
#endif
          file.at( 0 );             // position to start
    }
    iostat = 1;                           // assume error

    if ( h && h->read_image ) {
      (*h->read_image)( this );
    }
#ifndef QT_NO_ASYNC_IMAGE_IO
    else {
      // Format name, but no handler - must be an asychronous reader
      read_async_image( this );
    }
#endif

    if ( file.isOpen() ) {                // image was read using file
      file.close();
      iodev = 0;
    }
    return iostat == 0;                   // image successfully read?
}


/*!
    Writes an image to an IO device and returns TRUE if the image was
    successfully written; otherwise returns FALSE.

    Before writing an image you must set an IO device or a file name.
    If both an IO device and a file name have been set, the IO device
    will be used.

    The image will be written using the specified image format.

    Example:
    \code
      QImageIO iio;
      QImage   im;
      im = pixmap; // convert to image
      iio.setImage( im );
      iio.setFileName( "vegeburger.bmp" );
      iio.setFormat( "BMP" );
      if ( iio.write() )
          // returned TRUE if written successfully
    \endcode

    \sa setIODevice() setFileName() setFormat() read() QPixmap::save()
*/

04491 bool QImageIO::write()
{
    if ( frmt.isEmpty() )
      return FALSE;
    QImageHandler *h = get_image_handler( frmt );
    if ( !h && !plugin_manager) {
      qt_init_image_plugins();
      h = get_image_handler( frmt );
    }
    if ( !h || !h->write_image ) {
#if defined(QT_CHECK_RANGE)
      qWarning( "QImageIO::write: No such image format handler: %s",
             format() );
#endif
      return FALSE;
    }
    QFile file;
    if ( !iodev && !fname.isEmpty() ) {
      file.setName( fname );
      bool translate = h->text_mode==QImageHandler::TranslateInOut;
      int fmode = translate ? IO_WriteOnly|IO_Translate : IO_WriteOnly;
      if ( !file.open(fmode) )            // couldn't create file
          return FALSE;
      iodev = &file;
    }
    iostat = 1;
    (*h->write_image)( this );
    if ( file.isOpen() ) {                // image was written using file
      file.close();
      iodev = 0;
    }
    return iostat == 0;                   // image successfully written?
}
#endif //QT_NO_IMAGEIO

#ifndef QT_NO_IMAGEIO_BMP

/*****************************************************************************
  BMP (DIB) image read/write functions
 *****************************************************************************/

const int BMP_FILEHDR_SIZE = 14;          // size of BMP_FILEHDR data

struct BMP_FILEHDR {                      // BMP file header
    char   bfType[2];                     // "BM"
    Q_INT32  bfSize;                      // size of file
    Q_INT16  bfReserved1;
    Q_INT16  bfReserved2;
    Q_INT32  bfOffBits;                   // pointer to the pixmap bits
};

QDataStream &operator>>( QDataStream &s, BMP_FILEHDR &bf )
{                                   // read file header
    s.readRawBytes( bf.bfType, 2 );
    s >> bf.bfSize >> bf.bfReserved1 >> bf.bfReserved2 >> bf.bfOffBits;
    return s;
}

QDataStream &operator<<( QDataStream &s, const BMP_FILEHDR &bf )
{                                   // write file header
    s.writeRawBytes( bf.bfType, 2 );
    s << bf.bfSize << bf.bfReserved1 << bf.bfReserved2 << bf.bfOffBits;
    return s;
}


const int BMP_OLD  = 12;                  // old Windows/OS2 BMP size
const int BMP_WIN  = 40;                  // new Windows BMP size
const int BMP_OS2  = 64;                  // new OS/2 BMP size

const int BMP_RGB  = 0;                   // no compression
const int BMP_RLE8 = 1;                   // run-length encoded, 8 bits
const int BMP_RLE4 = 2;                   // run-length encoded, 4 bits
const int BMP_BITFIELDS = 3;              // RGB values encoded in data as bit-fields

struct BMP_INFOHDR {                      // BMP information header
    Q_INT32  biSize;                      // size of this struct
    Q_INT32  biWidth;                     // pixmap width
    Q_INT32  biHeight;                    // pixmap height
    Q_INT16  biPlanes;                    // should be 1
    Q_INT16  biBitCount;                  // number of bits per pixel
    Q_INT32  biCompression;               // compression method
    Q_INT32  biSizeImage;                       // size of image
    Q_INT32  biXPelsPerMeter;             // horizontal resolution
    Q_INT32  biYPelsPerMeter;             // vertical resolution
    Q_INT32  biClrUsed;                   // number of colors used
    Q_INT32  biClrImportant;              // number of important colors
};


QDataStream &operator>>( QDataStream &s, BMP_INFOHDR &bi )
{
    s >> bi.biSize;
    if ( bi.biSize == BMP_WIN || bi.biSize == BMP_OS2 ) {
      s >> bi.biWidth >> bi.biHeight >> bi.biPlanes >> bi.biBitCount;
      s >> bi.biCompression >> bi.biSizeImage;
      s >> bi.biXPelsPerMeter >> bi.biYPelsPerMeter;
      s >> bi.biClrUsed >> bi.biClrImportant;
    }
    else {                          // probably old Windows format
      Q_INT16 w, h;
      s >> w >> h >> bi.biPlanes >> bi.biBitCount;
      bi.biWidth  = w;
      bi.biHeight = h;
      bi.biCompression = BMP_RGB;         // no compression
      bi.biSizeImage = 0;
      bi.biXPelsPerMeter = bi.biYPelsPerMeter = 0;
      bi.biClrUsed = bi.biClrImportant = 0;
    }
    return s;
}

QDataStream &operator<<( QDataStream &s, const BMP_INFOHDR &bi )
{
    s << bi.biSize;
    s << bi.biWidth << bi.biHeight;
    s << bi.biPlanes;
    s << bi.biBitCount;
    s << bi.biCompression;
    s << bi.biSizeImage;
    s << bi.biXPelsPerMeter << bi.biYPelsPerMeter;
    s << bi.biClrUsed << bi.biClrImportant;
    return s;
}

static
int calc_shift(int mask)
{
    int result = 0;
    while (!(mask & 1)) {
      result++;
      mask >>= 1;
    }
    return result;
}

static
bool read_dib( QDataStream& s, int offset, int startpos, QImage& image )
{
    BMP_INFOHDR bi;
    QIODevice* d = s.device();

    s >> bi;                              // read BMP info header
    if ( d->atEnd() )                     // end of stream/file
      return FALSE;
#if 0
    qDebug( "offset...........%d", offset );
    qDebug( "startpos.........%d", startpos );
    qDebug( "biSize...........%d", bi.biSize );
    qDebug( "biWidth..........%d", bi.biWidth );
    qDebug( "biHeight.........%d", bi.biHeight );
    qDebug( "biPlanes.........%d", bi.biPlanes );
    qDebug( "biBitCount.......%d", bi.biBitCount );
    qDebug( "biCompression....%d", bi.biCompression );
    qDebug( "biSizeImage......%d", bi.biSizeImage );
    qDebug( "biXPelsPerMeter..%d", bi.biXPelsPerMeter );
    qDebug( "biYPelsPerMeter..%d", bi.biYPelsPerMeter );
    qDebug( "biClrUsed........%d", bi.biClrUsed );
    qDebug( "biClrImportant...%d", bi.biClrImportant );
#endif
    int w = bi.biWidth,  h = bi.biHeight,  nbits = bi.biBitCount;
    int t = bi.biSize,   comp = bi.biCompression;
    int red_mask, green_mask, blue_mask;
    int red_shift = 0;
    int green_shift = 0;
    int blue_shift = 0;
    int red_scale = 0;
    int green_scale = 0;
    int blue_scale = 0;

    if ( !(nbits == 1 || nbits == 4 || nbits == 8 || nbits == 16 || nbits == 24 || nbits == 32) ||
      bi.biPlanes != 1 || comp > BMP_BITFIELDS )
      return FALSE;                             // weird BMP image
    if ( !(comp == BMP_RGB || (nbits == 4 && comp == BMP_RLE4) ||
      (nbits == 8 && comp == BMP_RLE8) || ((nbits == 16 || nbits == 32) && comp == BMP_BITFIELDS)) )
       return FALSE;                      // weird compression type

    int ncols;
    int depth;
    switch ( nbits ) {
      case 32:
      case 24:
      case 16:
          depth = 32;
          break;
      case 8:
      case 4:
          depth = 8;
          break;
      default:
          depth = 1;
    }
    if ( depth == 32 )                    // there's no colormap
      ncols = 0;
    else                            // # colors used
      ncols = bi.biClrUsed ? bi.biClrUsed : 1 << nbits;

    image.create( w, h, depth, ncols, nbits == 1 ?
              QImage::BigEndian : QImage::IgnoreEndian );
    if ( image.isNull() )                 // could not create image
      return FALSE;

    image.setDotsPerMeterX( bi.biXPelsPerMeter );
    image.setDotsPerMeterY( bi.biYPelsPerMeter );

    d->at( startpos + BMP_FILEHDR_SIZE + bi.biSize ); // goto start of colormap

    if ( ncols > 0 ) {                    // read color table
      uchar rgb[4];
      int   rgb_len = t == BMP_OLD ? 3 : 4;
      for ( int i=0; i<ncols; i++ ) {
          if ( d->readBlock( (char *)rgb, rgb_len ) != rgb_len )
            return FALSE;
          image.setColor( i, qRgb(rgb[2],rgb[1],rgb[0]) );
          if ( d->atEnd() )               // truncated file
            return FALSE;
      }
    } else if (comp == BMP_BITFIELDS && (nbits == 16 || nbits == 32)) {
      if ( (Q_ULONG)d->readBlock( (char *)&red_mask, sizeof(red_mask) ) != sizeof(red_mask) )
          return FALSE;
      if ( (Q_ULONG)d->readBlock( (char *)&green_mask, sizeof(green_mask) ) != sizeof(green_mask) )
          return FALSE;
      if ( (Q_ULONG)d->readBlock( (char *)&blue_mask, sizeof(blue_mask) ) != sizeof(blue_mask) )
          return FALSE;
      red_shift = calc_shift(red_mask);
      red_scale = 256 / ((red_mask >> red_shift) + 1);
      green_shift = calc_shift(green_mask);
      green_scale = 256 / ((green_mask >> green_shift) + 1);
      blue_shift = calc_shift(blue_mask);
      blue_scale = 256 / ((blue_mask >> blue_shift) + 1);
    } else if (comp == BMP_RGB && (nbits == 24 || nbits == 32)) {
      blue_mask = 0x000000ff;
      green_mask = 0x0000ff00;
      red_mask = 0x00ff0000;
      blue_shift = 0;
      green_shift = 8;
      red_shift = 16;
      blue_scale = green_scale = red_scale = 1;
    } else if (comp == BMP_RGB && nbits == 16)  // don't support RGB values for 15/16 bpp
      return FALSE;

    // offset can be bogus, be careful
    if (offset>=0 && startpos + offset > (Q_LONG)d->at() )
      d->at( startpos + offset );         // start of image data

    int          bpl = image.bytesPerLine();
#ifdef Q_WS_QWS
    //
    // Guess the number of bytes-per-line if we don't know how much
    // image data is in the file (bogus image ?).
    //
    int bmpbpl = bi.biSizeImage > 0 ?
      bi.biSizeImage / bi.biHeight :
      (d->size() - offset) / bi.biHeight;
    int pad = bmpbpl-bpl;
#endif
    uchar **line = image.jumpTable();

    if ( nbits == 1 ) {                   // 1 bit BMP image
      while ( --h >= 0 ) {
          if ( d->readBlock((char*)line[h],bpl) != bpl )
            break;
#ifdef Q_WS_QWS
          if ( pad > 0 )
            d->at(d->at()+pad);
#endif
      }
      if ( ncols == 2 && qGray(image.color(0)) < qGray(image.color(1)) )
          swapPixel01( &image );          // pixel 0 is white!
    }

    else if ( nbits == 4 ) {              // 4 bit BMP image
      int    buflen = ((w+7)/8)*4;
      uchar *buf    = new uchar[buflen];
      Q_CHECK_PTR( buf );
      if ( comp == BMP_RLE4 ) {           // run length compression
          int x=0, y=0, b, c, i;
          register uchar *p = line[h-1];
          uchar *endp = line[h-1]+w;
          while ( y < h ) {
            if ( (b=d->getch()) == EOF )
                break;
            if ( b == 0 ) {               // escape code
                switch ( (b=d->getch()) ) {
                  case 0:                 // end of line
                      x = 0;
                      y++;
                      p = line[h-y-1];
                      break;
                  case 1:                 // end of image
                  case EOF:         // end of file
                      y = h;        // exit loop
                      break;
                  case 2:                 // delta (jump)
                      x += d->getch();
                      y += d->getch();

                      // Protection
                      if ( (uint)x >= (uint)w )
                        x = w-1;
                      if ( (uint)y >= (uint)h )
                        y = h-1;

                      p = line[h-y-1] + x;
                      break;
                  default:          // absolute mode
                      // Protection
                      if ( p + b > endp )
                        b = endp-p;

                      i = (c = b)/2;
                      while ( i-- ) {
                        b = d->getch();
                        *p++ = b >> 4;
                        *p++ = b & 0x0f;
                      }
                      if ( c & 1 )
                        *p++ = d->getch() >> 4;
                      if ( (((c & 3) + 1) & 2) == 2 )
                        d->getch(); // align on word boundary
                      x += c;
                }
            } else {                // encoded mode
                // Protection
                if ( p + b > endp )
                  b = endp-p;

                i = (c = b)/2;
                b = d->getch();           // 2 pixels to be repeated
                while ( i-- ) {
                  *p++ = b >> 4;
                  *p++ = b & 0x0f;
                }
                if ( c & 1 )
                  *p++ = b >> 4;
                x += c;
            }
          }
      } else if ( comp == BMP_RGB ) {           // no compression
          while ( --h >= 0 ) {
            if ( d->readBlock((char*)buf,buflen) != buflen )
                break;
            register uchar *p = line[h];
            uchar *b = buf;
            for ( int i=0; i<w/2; i++ ) { // convert nibbles to bytes
                *p++ = *b >> 4;
                *p++ = *b++ & 0x0f;
            }
            if ( w & 1 )                  // the last nibble
                *p = *b >> 4;
          }
      }
      delete [] buf;
    }

    else if ( nbits == 8 ) {              // 8 bit BMP image
      if ( comp == BMP_RLE8 ) {           // run length compression
          int x=0, y=0, b;
          register uchar *p = line[h-1];
          const uchar *endp = line[h-1]+w;
          while ( y < h ) {
            if ( (b=d->getch()) == EOF )
                break;
            if ( b == 0 ) {               // escape code
                switch ( (b=d->getch()) ) {
                  case 0:                 // end of line
                      x = 0;
                      y++;
                      p = line[h-y-1];
                      break;
                  case 1:                 // end of image
                  case EOF:         // end of file
                      y = h;        // exit loop
                      break;
                  case 2:                 // delta (jump)
                      x += d->getch();
                      y += d->getch();

                      // Protection
                      if ( (uint)x >= (uint)w )
                        x = w-1;
                      if ( (uint)y >= (uint)h )
                        y = h-1;

                      p = line[h-y-1] + x;
                      break;
                  default:          // absolute mode
                      // Protection
                      if ( p + b > endp )
                        b = endp-p;

                      if ( d->readBlock( (char *)p, b ) != b )
                        return FALSE;
                      if ( (b & 1) == 1 )
                        d->getch(); // align on word boundary
                      x += b;
                      p += b;
                }
            } else {                // encoded mode
                // Protection
                if ( p + b > endp )
                  b = endp-p;

                memset( p, d->getch(), b ); // repeat pixel
                x += b;
                p += b;
            }
          }
      } else if ( comp == BMP_RGB ) {           // uncompressed
          while ( --h >= 0 ) {
            if ( d->readBlock((char *)line[h],bpl) != bpl )
                break;
#ifdef Q_WS_QWS
            if ( pad > 0 )
                d->at(d->at()+pad);
#endif
          }
      }
    }

    else if ( nbits == 16 || nbits == 24 || nbits == 32 ) { // 16,24,32 bit BMP image
      register QRgb *p;
      QRgb  *end;
      uchar *buf24 = new uchar[bpl];
      int    bpl24 = ((w*nbits+31)/32)*4;
      uchar *b;
      int c;

      while ( --h >= 0 ) {
          p = (QRgb *)line[h];
          end = p + w;
          if ( d->readBlock( (char *)buf24,bpl24) != bpl24 )
            break;
          b = buf24;
          while ( p < end ) {
            c = *(uchar*)b | (*(uchar*)(b+1)<<8);
            if (nbits != 16)
                c |= *(uchar*)(b+2)<<16;
            *p++ = qRgb(((c & red_mask) >> red_shift) * red_scale,
                              ((c & green_mask) >> green_shift) * green_scale,
                              ((c & blue_mask) >> blue_shift) * blue_scale);
            b += nbits/8;
          }
      }
      delete[] buf24;
    }

    return TRUE;
}

bool qt_read_dib( QDataStream& s, QImage& image )
{
    return read_dib(s,-1,-BMP_FILEHDR_SIZE,image);
}


static void read_bmp_image( QImageIO *iio )
{
    QIODevice  *d = iio->ioDevice();
    QDataStream s( d );
    BMP_FILEHDR bf;
    int           startpos = d->at();

    s.setByteOrder( QDataStream::LittleEndian );// Intel byte order
    s >> bf;                              // read BMP file header

    if ( qstrncmp(bf.bfType,"BM",2) != 0 )      // not a BMP image
      return;

    QImage image;
    if (read_dib( s, bf.bfOffBits, startpos, image )) {
      iio->setImage( image );
      iio->setStatus( 0 );                // image ok
    }
}

bool qt_write_dib( QDataStream& s, QImage image )
{
    int     nbits;
    int     bpl_bmp;
    int     bpl = image.bytesPerLine();

    QIODevice* d = s.device();

    if ( image.depth() == 8 && image.numColors() <= 16 ) {
      bpl_bmp = (((bpl+1)/2+3)/4)*4;
      nbits = 4;
    } else if ( image.depth() == 32 ) {
      bpl_bmp = ((image.width()*24+31)/32)*4;
      nbits = 24;
#ifdef Q_WS_QWS
    } else if ( image.depth() == 1 || image.depth() == 8 ) {
      // Qt/E doesn't word align.
      bpl_bmp = ((image.width()*image.depth()+31)/32)*4;
      nbits = image.depth();
#endif
    } else {
      bpl_bmp = bpl;
      nbits = image.depth();
    }

    BMP_INFOHDR bi;
    bi.biSize            = BMP_WIN;       // build info header
    bi.biWidth           = image.width();
    bi.biHeight          = image.height();
    bi.biPlanes          = 1;
    bi.biBitCount      = nbits;
    bi.biCompression   = BMP_RGB;
    bi.biSizeImage     = bpl_bmp*image.height();
    bi.biXPelsPerMeter = image.dotsPerMeterX() ? image.dotsPerMeterX()
                                    : 2834; // 72 dpi default
    bi.biYPelsPerMeter = image.dotsPerMeterY() ? image.dotsPerMeterY() : 2834;
    bi.biClrUsed       = image.numColors();
    bi.biClrImportant  = image.numColors();
    s << bi;                              // write info header

    if ( image.depth() != 32 ) {          // write color table
      uchar *color_table = new uchar[4*image.numColors()];
      uchar *rgb = color_table;
      QRgb *c = image.colorTable();
      for ( int i=0; i<image.numColors(); i++ ) {
          *rgb++ = qBlue ( c[i] );
          *rgb++ = qGreen( c[i] );
          *rgb++ = qRed  ( c[i] );
          *rgb++ = 0;
      }
      d->writeBlock( (char *)color_table, 4*image.numColors() );
      delete [] color_table;
    }

    if ( image.depth() == 1 && image.bitOrder() != QImage::BigEndian )
      image = image.convertBitOrder( QImage::BigEndian );

    int      y;

    if ( nbits == 1 || nbits == 8 ) {           // direct output
#ifdef Q_WS_QWS
      // Qt/E doesn't word align.
      int pad = bpl_bmp - bpl;
      char padding[4];
#endif
      for ( y=image.height()-1; y>=0; y-- ) {
          d->writeBlock( (char*)image.scanLine(y), bpl );
#ifdef Q_WS_QWS
          d->writeBlock( padding, pad );
#endif
      }
      return TRUE;
    }

    uchar *buf    = new uchar[bpl_bmp];
    uchar *b, *end;
    register uchar *p;

    memset( buf, 0, bpl_bmp );
    for ( y=image.height()-1; y>=0; y-- ) {     // write the image bits
      if ( nbits == 4 ) {                 // convert 8 -> 4 bits
          p = image.scanLine(y);
          b = buf;
          end = b + image.width()/2;
          while ( b < end ) {
            *b++ = (*p << 4) | (*(p+1) & 0x0f);
            p += 2;
          }
          if ( image.width() & 1 )
            *b = *p << 4;
      } else {                      // 32 bits
          QRgb *p   = (QRgb *)image.scanLine( y );
          QRgb *end = p + image.width();
          b = buf;
          while ( p < end ) {
            *b++ = qBlue(*p);
            *b++ = qGreen(*p);
            *b++ = qRed(*p);
            p++;
          }
      }
      if ( bpl_bmp != d->writeBlock( (char*)buf, bpl_bmp ) ) {
          delete[] buf;
          return FALSE;
      }
    }
    delete[] buf;
    return TRUE;
}


static void write_bmp_image( QImageIO *iio )
{
    QIODevice  *d = iio->ioDevice();
    QImage  image = iio->image();
    QDataStream s( d );
    BMP_FILEHDR bf;
    int           bpl_bmp;
    int           bpl = image.bytesPerLine();

    // Code partially repeated in qt_write_dib
    if ( image.depth() == 8 && image.numColors() <= 16 ) {
      bpl_bmp = (((bpl+1)/2+3)/4)*4;
    } else if ( image.depth() == 32 ) {
      bpl_bmp = ((image.width()*24+31)/32)*4;
    } else {
      bpl_bmp = bpl;
    }

    iio->setStatus( 0 );
    s.setByteOrder( QDataStream::LittleEndian );// Intel byte order
    strncpy( bf.bfType, "BM", 2 );        // build file header
    bf.bfReserved1 = bf.bfReserved2 = 0;  // reserved, should be zero
    bf.bfOffBits   = BMP_FILEHDR_SIZE + BMP_WIN + image.numColors()*4;
    bf.bfSize        = bf.bfOffBits + bpl_bmp*image.height();
    s << bf;                              // write file header

    if ( !qt_write_dib( s, image ) )
      iio->setStatus( 1 );

}

#endif // QT_NO_IMAGEIO_BMP

#ifndef QT_NO_IMAGEIO_PPM

/*****************************************************************************
  PBM/PGM/PPM (ASCII and RAW) image read/write functions
 *****************************************************************************/

static int read_pbm_int( QIODevice *d )
{
    int       c;
    int       val = -1;
    bool  digit;
    const int buflen = 100;
    char  buf[buflen];
    for ( ;; ) {
      if ( (c=d->getch()) == EOF )        // end of file
          break;
      digit = isdigit( (uchar) c );
      if ( val != -1 ) {
          if ( digit ) {
            val = 10*val + c - '0';
            continue;
          } else {
            if ( c == '#' )               // comment
                d->readLine( buf, buflen );
            break;
          }
      }
      if ( digit )                        // first digit
          val = c - '0';
      else if ( isspace((uchar) c) )
          continue;
      else if ( c == '#' )
          d->readLine( buf, buflen );
      else
          break;
    }
    return val;
}

static void read_pbm_image( QImageIO *iio )     // read PBM image data
{
    const int     buflen = 300;
    char    buf[buflen];
    QIODevice  *d = iio->ioDevice();
    int           w, h, nbits, mcc, y;
    int           pbm_bpl;
    char    type;
    bool    raw;
    QImage  image;

    if ( d->readBlock( buf, 3 ) != 3 )                // read P[1-6]<white-space>
      return;
    if ( !(buf[0] == 'P' && isdigit((uchar) buf[1]) && isspace((uchar) buf[2])) )
      return;
    switch ( (type=buf[1]) ) {
      case '1':                     // ascii PBM
      case '4':                     // raw PBM
          nbits = 1;
          break;
      case '2':                     // ascii PGM
      case '5':                     // raw PGM
          nbits = 8;
          break;
      case '3':                     // ascii PPM
      case '6':                     // raw PPM
          nbits = 32;
          break;
      default:
          return;
    }
    raw = type >= '4';
    w = read_pbm_int( d );                // get image width
    h = read_pbm_int( d );                // get image height
    if ( nbits == 1 )
      mcc = 1;                      // ignore max color component
    else
      mcc = read_pbm_int( d );            // get max color component
    if ( w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0 )
      return;                             // weird P.M image

    int maxc = mcc;
    if ( maxc > 255 )
      maxc = 255;
    image.create( w, h, nbits, 0,
              nbits == 1 ? QImage::BigEndian :  QImage::IgnoreEndian );
    if ( image.isNull() )
      return;

    pbm_bpl = (nbits*w+7)/8;              // bytes per scanline in PBM

    if ( raw ) {                    // read raw data
      if ( nbits == 32 ) {                // type 6
          pbm_bpl = 3*w;
          uchar *buf24 = new uchar[pbm_bpl], *b;
          QRgb  *p;
          QRgb  *end;
          for ( y=0; y<h; y++ ) {
            if ( d->readBlock( (char *)buf24, pbm_bpl ) != pbm_bpl ) {
                delete[] buf24;
                return;
            }
            p = (QRgb *)image.scanLine( y );
            end = p + w;
            b = buf24;
            while ( p < end ) {
                *p++ = qRgb(b[0],b[1],b[2]);
                b += 3;
            }
          }
          delete[] buf24;
      } else {                      // type 4,5
          for ( y=0; y<h; y++ ) {
            if ( d->readBlock( (char *)image.scanLine(y), pbm_bpl )
                  != pbm_bpl )
                return;
          }
      }
    } else {                              // read ascii data
      register uchar *p;
      int n;
      for ( y=0; y<h; y++ ) {
          p = image.scanLine( y );
          n = pbm_bpl;
          if ( nbits == 1 ) {
            int b;
            while ( n-- ) {
                b = 0;
                for ( int i=0; i<8; i++ )
                  b = (b << 1) | (read_pbm_int(d) & 1);
                *p++ = b;
            }
          } else if ( nbits == 8 ) {
            if ( mcc == maxc ) {
                while ( n-- ) {
                  *p++ = read_pbm_int( d );
                }
            } else {
                while ( n-- ) {
                  *p++ = read_pbm_int( d ) * maxc / mcc;
                }
            }
          } else {                        // 32 bits
            n /= 4;
            int r, g, b;
            if ( mcc == maxc ) {
                while ( n-- ) {
                  r = read_pbm_int( d );
                  g = read_pbm_int( d );
                  b = read_pbm_int( d );
                  *((QRgb*)p) = qRgb( r, g, b );
                  p += 4;
                }
            } else {
                while ( n-- ) {
                  r = read_pbm_int( d ) * maxc / mcc;
                  g = read_pbm_int( d ) * maxc / mcc;
                  b = read_pbm_int( d ) * maxc / mcc;
                  *((QRgb*)p) = qRgb( r, g, b );
                  p += 4;
                }
            }
          }
      }
    }

    if ( nbits == 1 ) {                   // bitmap
      image.setNumColors( 2 );
      image.setColor( 0, qRgb(255,255,255) ); // white
      image.setColor( 1, qRgb(0,0,0) );   // black
    } else if ( nbits == 8 ) {                  // graymap
      image.setNumColors( maxc+1 );
      for ( int i=0; i<=maxc; i++ )
          image.setColor( i, qRgb(i*255/maxc,i*255/maxc,i*255/maxc) );
    }

    iio->setImage( image );
    iio->setStatus( 0 );                  // image ok
}


static void write_pbm_image( QImageIO *iio )
{
    QIODevice* out = iio->ioDevice();
    QCString str;

    QImage  image  = iio->image();
    QCString format = iio->format();
    format = format.left(3);              // ignore RAW part
    bool gray = format == "PGM";

    if ( format == "PBM" ) {
      image = image.convertDepth(1);
    } else if ( image.depth() == 1 ) {
      image = image.convertDepth(8);
    }

    if ( image.depth() == 1 && image.numColors() == 2 ) {
      if ( qGray(image.color(0)) < qGray(image.color(1)) ) {
          // 0=dark/black, 1=light/white - invert
          image.detach();
          for ( int y=0; y<image.height(); y++ ) {
            uchar *p = image.scanLine(y);
            uchar *end = p + image.bytesPerLine();
            while ( p < end )
                *p++ ^= 0xff;
          }
      }
    }

    uint w = image.width();
    uint h = image.height();

    str.sprintf("P\n%d %d\n", w, h);

    switch (image.depth()) {
      case 1: {
          str.insert(1, '4');
          if ((uint)out->writeBlock(str, str.length()) != str.length()) {
            iio->setStatus(1);
            return;
          }
          w = (w+7)/8;
          for (uint y=0; y<h; y++) {
            uchar* line = image.scanLine(y);
            if ( w != (uint)out->writeBlock((char*)line, w) ) {
                iio->setStatus(1);
                return;
            }
          }
          }
          break;

      case 8: {
          str.insert(1, gray ? '5' : '6');
          str.append("255\n");
          if ((uint)out->writeBlock(str, str.length()) != str.length()) {
            iio->setStatus(1);
            return;
          }
          QRgb  *color = image.colorTable();
          uint bpl = w*(gray ? 1 : 3);
          uchar *buf   = new uchar[bpl];
          for (uint y=0; y<h; y++) {
            uchar *b = image.scanLine(y);
            uchar *p = buf;
            uchar *end = buf+bpl;
            if ( gray ) {
                while ( p < end ) {
                  uchar g = (uchar)qGray(color[*b++]);
                  *p++ = g;
                }
            } else {
                while ( p < end ) {
                  QRgb rgb = color[*b++];
                  *p++ = qRed(rgb);
                  *p++ = qGreen(rgb);
                  *p++ = qBlue(rgb);
                }
            }
            if ( bpl != (uint)out->writeBlock((char*)buf, bpl) ) {
                iio->setStatus(1);
                return;
            }
          }
          delete [] buf;
          }
          break;

      case 32: {
          str.insert(1, gray ? '5' : '6');
          str.append("255\n");
          if ((uint)out->writeBlock(str, str.length()) != str.length()) {
            iio->setStatus(1);
            return;
          }
          uint bpl = w*(gray ? 1 : 3);
          uchar *buf = new uchar[bpl];
          for (uint y=0; y<h; y++) {
            QRgb  *b = (QRgb*)image.scanLine(y);
            uchar *p = buf;
            uchar *end = buf+bpl;
            if ( gray ) {
                while ( p < end ) {
                  uchar g = (uchar)qGray(*b++);
                  *p++ = g;
                }
            } else {
                while ( p < end ) {
                  QRgb rgb = *b++;
                  *p++ = qRed(rgb);
                  *p++ = qGreen(rgb);
                  *p++ = qBlue(rgb);
                }
            }
            if ( bpl != (uint)out->writeBlock((char*)buf, bpl) ) {
                iio->setStatus(1);
                return;
            }
          }
          delete [] buf;
          }
    }

    iio->setStatus(0);
}

#endif // QT_NO_IMAGEIO_PPM

#ifndef QT_NO_ASYNC_IMAGE_IO

class QImageIOFrameGrabber : public QImageConsumer {
public:
    QImageIOFrameGrabber() : framecount(0) { }

    QImageDecoder *decoder;
    int framecount;

    void changed(const QRect&) { }
    void end() { }
    void frameDone(const QPoint&, const QRect&) { framecount++; }
    void frameDone() { framecount++; }
    void setLooping(int) { }
    void setFramePeriod(int) { }
    void setSize(int, int) { }
};

static void read_async_image( QImageIO *iio )
{
    const int buf_len = 2048;
    uchar buffer[buf_len];
    QIODevice  *d = iio->ioDevice();
    QImageIOFrameGrabber* consumer = new QImageIOFrameGrabber();
    QImageDecoder *decoder = new QImageDecoder(consumer);
    consumer->decoder = decoder;
    int startAt = d->at();
    int totLen = 0;

    for (;;) {
      int length = d->readBlock((char*)buffer, buf_len);
      if ( length <= 0 ) {
          iio->setStatus(length);
          break;
      }
      uchar* b = buffer;
      int r = -1;
      while (length > 0 && consumer->framecount==0) {
          r = decoder->decode(b, length);
          if ( r <= 0 ) break;
          b += r;
          totLen += r;
          length -= r;
      }
      if ( consumer->framecount ) {
          // Stopped after first frame
          if ( d->isDirectAccess() )
            d->at( startAt + totLen );
          else {
            // ### We have (probably) read too much from the stream into
            // the buffer, and there is no way to put it back!
          }
          iio->setImage(decoder->image());
          iio->setStatus(0);
          break;
      }
      if ( r <= 0 ) {
          iio->setStatus(r);
          break;
      }
    }

    consumer->decoder = 0;
    delete decoder;
    delete consumer;
}

#endif // QT_NO_ASYNC_IMAGE_IO

#ifndef QT_NO_IMAGEIO_XBM

/*****************************************************************************
  X bitmap image read/write functions
 *****************************************************************************/

static inline int hex2byte( register char *p )
{
    return ( (isdigit((uchar) *p) ? *p - '0' : toupper((uchar) *p) - 'A' + 10) << 4 ) |
         ( isdigit((uchar) *(p+1)) ? *(p+1) - '0' : toupper((uchar) *(p+1)) - 'A' + 10 );
}

static void read_xbm_image( QImageIO *iio )
{
    const int     buflen = 300;
    char    buf[buflen];
    QRegExp r1, r2;
    QIODevice  *d = iio->ioDevice();
    int           w=-1, h=-1;
    QImage  image;

    r1 = QString::fromLatin1("^#define[ \t]+[a-zA-Z0-9._]+[ \t]+");
    r2 = QString::fromLatin1("[0-9]+");
    d->readLine( buf, buflen );           // "#define .._width <num>"

    while (!d->atEnd() && buf[0] != '#') //skip leading comment, if any
        d->readLine( buf, buflen );

    QString sbuf;
    sbuf = QString::fromLatin1(buf);

   if ( r1.search(sbuf) == 0 &&
       r2.search(sbuf, r1.matchedLength()) == r1.matchedLength() )
      w = atoi( &buf[r1.matchedLength()] );

    d->readLine( buf, buflen );                 // "#define .._height <num>"
    sbuf = QString::fromLatin1(buf);

    if ( r1.search(sbuf) == 0 &&
       r2.search(sbuf, r1.matchedLength()) == r1.matchedLength() )
      h = atoi( &buf[r1.matchedLength()] );

    if ( w <= 0 || w > 32767 || h <= 0 || h > 32767 )
      return;                             // format error

    for ( ;; ) {                    // scan for data
      if ( d->readLine(buf, buflen) <= 0 )      // end of file
          return;
      if ( strstr(buf,"0x") != 0 )        // does line contain data?
          break;
    }

    image.create( w, h, 1, 2, QImage::LittleEndian );
    if ( image.isNull() )
      return;

    image.setColor( 0, qRgb(255,255,255) );     // white
    image.setColor( 1, qRgb(0,0,0) );           // black

    int        x = 0, y = 0;
    uchar *b = image.scanLine(0);
    char  *p = strstr( buf, "0x" );
    w = (w+7)/8;                    // byte width

    while ( y < h ) {                     // for all encoded bytes...
      if ( p ) {                    // p = "0x.."
          *b++ = hex2byte(p+2);
          p += 2;
          if ( ++x == w && ++y < h ) {
            b = image.scanLine(y);
            x = 0;
          }
          p = strstr( p, "0x" );
      } else {                      // read another line
          if ( d->readLine(buf,buflen) <= 0 )   // EOF ==> truncated image
            break;
          p = strstr( buf, "0x" );
      }
    }

    iio->setImage( image );
    iio->setStatus( 0 );                  // image ok
}


static void write_xbm_image( QImageIO *iio )
{
    QIODevice *d = iio->ioDevice();
    QImage     image = iio->image();
    int            w = image.width();
    int            h = image.height();
    int            i;
    QString    s = fbname(iio->fileName());     // get file base name
    char *buf = new char[s.length() + 100];

    sprintf( buf, "#define %s_width %d\n", s.ascii(), w );
    d->writeBlock( buf, qstrlen(buf) );
    sprintf( buf, "#define %s_height %d\n", s.ascii(), h );
    d->writeBlock( buf, qstrlen(buf) );
    sprintf( buf, "static char %s_bits[] = {\n ", s.ascii() );
    d->writeBlock( buf, qstrlen(buf) );

    iio->setStatus( 0 );

    if ( image.depth() != 1 )
      image = image.convertDepth( 1 );    // dither
    if ( image.bitOrder() != QImage::LittleEndian )
        image = image.convertBitOrder( QImage::LittleEndian );

    bool invert = qGray(image.color(0)) < qGray(image.color(1));
    char hexrep[16];
    for ( i=0; i<10; i++ )
      hexrep[i] = '0' + i;
    for ( i=10; i<16; i++ )
      hexrep[i] = 'a' -10 + i;
    if ( invert ) {
      char t;
      for ( i=0; i<8; i++ ) {
          t = hexrep[15-i];
          hexrep[15-i] = hexrep[i];
          hexrep[i] = t;
      }
    }
    int bcnt = 0;
    register char *p = buf;
    int bpl = (w+7)/8;
    for (int y = 0; y < h; ++y) {
        uchar *b = image.scanLine(y);
        for (i = 0; i < bpl; ++i) {
            *p++ = '0'; *p++ = 'x';
            *p++ = hexrep[*b >> 4];
            *p++ = hexrep[*b++ & 0xf];

            if ( i < bpl - 1 || y < h - 1 ) {
                *p++ = ',';
                if ( ++bcnt > 14 ) {
                    *p++ = '\n';
                    *p++ = ' ';
                    *p   = '\0';
                    if ( (int)qstrlen(buf) != d->writeBlock( buf, qstrlen(buf) ) ) {
                        iio->setStatus( 1 );
                        delete [] buf;
                        return;
                    }
                    p = buf;
                    bcnt = 0;
                }
            }
        }
    }
    strcpy( p, " };\n" );
    if ( (int)qstrlen(buf) != d->writeBlock( buf, qstrlen(buf) ) )
      iio->setStatus( 1 );
    delete [] buf;
}

#endif // QT_NO_IMAGEIO_XBM


#ifndef QT_NO_IMAGEIO_XPM

/*****************************************************************************
  XPM image read/write functions
 *****************************************************************************/


// Skip until ", read until the next ", return the rest in *buf
// Returns FALSE on error, TRUE on success

static bool read_xpm_string( QCString &buf, QIODevice *d,
                       const char * const *source, int &index )
{
    if ( source ) {
      buf = source[index++];
      return TRUE;
    }

    if ( buf.size() < 69 )        //# just an approximation
      buf.resize( 123 );

    buf[0] = '\0';
    int c;
    int i;
    while ( (c=d->getch()) != EOF && c != '"' ) { }
    if ( c == EOF ) {
      return FALSE;
    }
    i = 0;
    while ( (c=d->getch()) != EOF && c != '"' ) {
      if ( i == (int)buf.size() )
          buf.resize( i*2+42 );
      buf[i++] = c;
    }
    if ( c == EOF ) {
      return FALSE;
    }

    if ( i == (int)buf.size() ) // always use a 0 terminator
      buf.resize( i+1 );
    buf[i] = '\0';
    return TRUE;
}



static int nextColorSpec(const QCString & buf)
{
    int i = buf.find(" c ");
    if (i < 0)
        i = buf.find(" g ");
    if (i < 0)
        i = buf.find(" g4 ");
    if (i < 0)
        i = buf.find(" m ");
    if (i < 0)
        i = buf.find(" s ");
    return i;
}

//
// INTERNAL
//
// Reads an .xpm from either the QImageIO or from the QString *.
// One of the two HAS to be 0, the other one is used.
//

static void read_xpm_image_or_array( QImageIO * iio, const char * const * source,
                             QImage & image)
{
    QCString buf;
    QIODevice *d = 0;
    buf.resize( 200 );

    int i, cpp, ncols, w, h, index = 0;

    if ( iio ) {
      iio->setStatus( 1 );
      d = iio ? iio->ioDevice() : 0;
      d->readLine( buf.data(), buf.size() );    // "/* XPM */"
      QRegExp r( QString::fromLatin1("/\\*.XPM.\\*/") );
      if ( buf.find(r) == -1 )
          return;                         // bad magic
    } else if ( !source ) {
      return;
    }

    if ( !read_xpm_string( buf, d, source, index ) )
      return;

    if ( sscanf( buf, "%d %d %d %d", &w, &h, &ncols, &cpp ) < 4 )
      return;                             // < 4 numbers parsed

    if ( cpp > 15 )
      return;

    if ( ncols > 256 ) {
      image.create( w, h, 32 );
    } else {
      image.create( w, h, 8, ncols );
    }

    if (image.isNull())
        return;

    QMap<QString, int> colorMap;
    int currentColor;

    for( currentColor=0; currentColor < ncols; ++currentColor ) {
      if ( !read_xpm_string( buf, d, source, index ) ) {
#if defined(QT_CHECK_RANGE)
          qWarning( "QImage: XPM color specification missing");
#endif
          return;
      }
      QString index;
      index = buf.left( cpp );
      buf = buf.mid( cpp ).simplifyWhiteSpace().lower();
      buf.prepend( " " );
      i = nextColorSpec(buf);
      if ( i < 0 ) {
#if defined(QT_CHECK_RANGE)
          qWarning( "QImage: XPM color specification is missing: %s", buf.data());
#endif
          return; // no c/g/g4/m/s specification at all
      }
      buf = buf.mid( i+3 );
      // Strip any other colorspec
      int end = nextColorSpec(buf);
      if (end != -1)
          buf.truncate(end);
      buf = buf.stripWhiteSpace();
      if ( buf == "none" ) {
          image.setAlphaBuffer( TRUE );
          int transparentColor = currentColor;
          if ( image.depth() == 8 ) {
            image.setColor( transparentColor,
                        RGB_MASK & qRgb(198,198,198) );
            colorMap.insert( index, transparentColor );
          } else {
            QRgb rgb = RGB_MASK & qRgb(198,198,198);
            colorMap.insert( index, rgb );
          }
      } else {
          if ( ((buf.length()-1) % 3) && (buf[0] == '#') ) {
            buf.truncate (((buf.length()-1) / 4 * 3) + 1); // remove alpha channel left by imagemagick
          }
          QColor c( buf.data() );
          if ( image.depth() == 8 ) {
            image.setColor( currentColor, 0xff000000 | c.rgb() );
            colorMap.insert( index, currentColor );
          } else {
            QRgb rgb = 0xff000000 | c.rgb();
            colorMap.insert( index, rgb );
          }
      }
    }

    // Read pixels
    for( int y=0; y<h; y++ ) {
      if ( !read_xpm_string( buf, d, source, index ) ) {
#if defined(QT_CHECK_RANGE)
          qWarning( "QImage: XPM pixels missing on image line %d", y);
#endif
          return;
      }
      if ( image.depth() == 8 ) {
          uchar *p = image.scanLine(y);
          uchar *d = (uchar *)buf.data();
          uchar *end = d + buf.length();
          int x;
          if ( cpp == 1 ) {
            char b[2];
            b[1] = '\0';
            for ( x=0; x<w && d<end; x++ ) {
                b[0] = *d++;
                *p++ = (uchar)colorMap[b];
            }
          } else {
            char b[16];
            b[cpp] = '\0';
            for ( x=0; x<w && d<end; x++ ) {
                strncpy( b, (char *)d, cpp );
                *p++ = (uchar)colorMap[b];
                d += cpp;
            }
          }
      } else {
          QRgb *p = (QRgb*)image.scanLine(y);
          uchar *d = (uchar *)buf.data();
          uchar *end = d + buf.length();
          int x;
          char b[16];
          b[cpp] = '\0';
          for ( x=0; x<w && d<end; x++ ) {
            strncpy( b, (char *)d, cpp );
            *p++ = (QRgb)colorMap[b];
            d += cpp;
          }
      }
    }
    if ( iio ) {
      iio->setImage( image );
      iio->setStatus( 0 );                // image ok
    }
}


static void read_xpm_image( QImageIO * iio )
{
    QImage i;
    (void)read_xpm_image_or_array( iio, 0, i );
    return;
}


static const char* xpm_color_name( int cpp, int index )
{
    static char returnable[5];
    static const char code[] = ".#abcdefghijklmnopqrstuvwxyzABCD"
                         "EFGHIJKLMNOPQRSTUVWXYZ0123456789";
    // cpp is limited to 4 and index is limited to 64^cpp
    if ( cpp > 1 ) {
      if ( cpp > 2 ) {
          if ( cpp > 3 ) {
            returnable[3] = code[index % 64];
            index /= 64;
          } else
            returnable[3] = '\0';
          returnable[2] = code[index % 64];
          index /= 64;
      } else
          returnable[2] = '\0';
      // the following 4 lines are a joke!
      if ( index == 0 )
          index = 64*44+21;
      else if ( index == 64*44+21 )
          index = 0;
      returnable[1] = code[index % 64];
      index /= 64;
    } else
      returnable[1] = '\0';
    returnable[0] = code[index];

    return returnable;
}


// write XPM image data
static void write_xpm_image( QImageIO * iio )
{
    if ( iio )
      iio->setStatus( 1 );
    else
      return;

    // ### 8-bit case could be made faster
    QImage image;
    if ( iio->image().depth() != 32 )
      image = iio->image().convertDepth( 32 );
    else
      image = iio->image();

    QMap<QRgb, int> colorMap;

    int w = image.width(), h = image.height(), ncolors = 0;
    int x, y;

    // build color table
    for( y=0; y<h; y++ ) {
      QRgb * yp = (QRgb *)image.scanLine( y );
      for( x=0; x<w; x++ ) {
          QRgb color = *(yp + x);
          if ( !colorMap.contains(color) )
            colorMap.insert( color, ncolors++ );
      }
    }

    // number of 64-bit characters per pixel needed to encode all colors
    int cpp = 1;
    for ( int k = 64; ncolors > k; k *= 64 ) {
      ++cpp;
      // limit to 4 characters per pixel
      // 64^4 colors is enough for a 4096x4096 image
       if ( cpp > 4)
          break;
    }

    QString line;

    // write header
    QTextStream s( iio->ioDevice() );
    s << "/* XPM */" << endl
      << "static char *" << fbname(iio->fileName()) << "[]={" << endl
      << "\"" << w << " " << h << " " << ncolors << " " << cpp << "\"";

    // write palette
    QMap<QRgb, int>::Iterator c = colorMap.begin();
    while ( c != colorMap.end() ) {
      QRgb color = c.key();
      if ( image.hasAlphaBuffer() && color == (color & RGB_MASK) )
          line.sprintf( "\"%s c None\"",
                    xpm_color_name(cpp, *c) );
      else
          line.sprintf( "\"%s c #%02x%02x%02x\"",
                    xpm_color_name(cpp, *c),
                    qRed(color),
                    qGreen(color),
                    qBlue(color) );
      ++c;
      s << "," << endl << line;
    }

    // write pixels, limit to 4 characters per pixel
    line.truncate( cpp*w );
    for( y=0; y<h; y++ ) {
      QRgb * yp = (QRgb *) image.scanLine( y );
      int cc = 0;
      for( x=0; x<w; x++ ) {
          int color = (int)(*(yp + x));
          QCString chars = xpm_color_name( cpp, colorMap[color] );
          line[cc++] = chars[0];
          if ( cpp > 1 ) {
            line[cc++] = chars[1];
            if ( cpp > 2 ) {
                line[cc++] = chars[2];
                if ( cpp > 3 ) {
                  line[cc++] = chars[3];
                }
            }
          }
      }
      s << "," << endl << "\"" << line << "\"";
    }
    s << "};" << endl;

    iio->setStatus( 0 );
}

#endif // QT_NO_IMAGEIO_XPM

/*!
    Returns an image with depth \a d, using the \a palette_count
    colors pointed to by \a palette. If \a d is 1 or 8, the returned
    image will have its color table ordered the same as \a palette.

    If the image needs to be modified to fit in a lower-resolution
    result (e.g. converting from 32-bit to 8-bit), use the \a
    conversion_flags to specify how you'd prefer this to happen.

    Note: currently no closest-color search is made. If colors are
    found that are not in the palette, the palette may not be used at
    all. This result should not be considered valid because it may
    change in future implementations.

    Currently inefficient for non-32-bit images.

    \sa Qt::ImageConversionFlags
*/
#ifndef QT_NO_IMAGE_TRUECOLOR
06007 QImage QImage::convertDepthWithPalette( int d, QRgb* palette, int palette_count, int conversion_flags ) const
{
    if ( depth() == 1 ) {
      return convertDepth( 8, conversion_flags )
             .convertDepthWithPalette( d, palette, palette_count, conversion_flags );
    } else if ( depth() == 8 ) {
      // ### this could be easily made more efficient
      return convertDepth( 32, conversion_flags )
             .convertDepthWithPalette( d, palette, palette_count, conversion_flags );
    } else {
      QImage result;
      convert_32_to_8( this, &result,
          (conversion_flags&~Qt::DitherMode_Mask) | Qt::AvoidDither,
          palette, palette_count );
      return result.convertDepth( d );
    }
}
#endif
static
bool
haveSamePalette(const QImage& a, const QImage& b)
{
    if (a.depth() != b.depth()) return FALSE;
    if (a.numColors() != b.numColors()) return FALSE;
    QRgb* ca = a.colorTable();
    QRgb* cb = b.colorTable();
    for (int i=a.numColors(); i--; ) {
      if (*ca++ != *cb++) return FALSE;
    }
    return TRUE;
}

/*!
    \relates QImage

    Copies a block of pixels from \a src to \a dst. The pixels
    copied from source (src) are converted according to
    \a conversion_flags if it is incompatible with the destination
    (\a dst).

    \a sx, \a sy is the top-left pixel in \a src, \a dx, \a dy
    is the top-left position in \a dst and \a sw, \sh is the
    size of the copied block.

    The copying is clipped if areas outside \a src or \a dst are
    specified.

    If \a sw is -1, it is adjusted to src->width(). Similarly, if \a
    sh is -1, it is adjusted to src->height().

    Currently inefficient for non 32-bit images.
*/
06059 void bitBlt( QImage* dst, int dx, int dy, const QImage* src,
            int sx, int sy, int sw, int sh, int conversion_flags )
{
    // Parameter correction
    if ( sw < 0 ) sw = src->width();
    if ( sh < 0 ) sh = src->height();
    if ( sx < 0 ) { dx -= sx; sw += sx; sx = 0; }
    if ( sy < 0 ) { dy -= sy; sh += sy; sy = 0; }
    if ( dx < 0 ) { sx -= dx; sw += dx; dx = 0; }
    if ( dy < 0 ) { sy -= dy; sh += dy; dy = 0; }
    if ( sx + sw > src->width() ) sw = src->width() - sx;
    if ( sy + sh > src->height() ) sh = src->height() - sy;
    if ( dx + sw > dst->width() ) sw = dst->width() - dx;
    if ( dy + sh > dst->height() ) sh = dst->height() - dy;
    if ( sw <= 0 || sh <= 0 ) return; // Nothing left to copy
    if ( (dst->data == src->data) && dx==sx && dy==sy ) return; // Same pixels

    // "Easy" to copy if both same depth and one of:
    //   - 32 bit
    //   - 8 bit, identical palette
    //   - 1 bit, identical palette and byte-aligned area
    //
    if ( haveSamePalette(*dst,*src)
       && ( dst->depth() != 1 ||
            !( (dx&7) || (sx&7) ||
             ((sw&7) && (sx+sw < src->width()) ||
              (dx+sw < dst->width()) ) ) ) )
      {
          // easy to copy
      } else if ( dst->depth() != 32 ) {
#ifndef QT_NO_IMAGE_TRUECOLOR

          QImage dstconv = dst->convertDepth( 32 );
          bitBlt( &dstconv, dx, dy, src, sx, sy, sw, sh,
                (conversion_flags&~Qt::DitherMode_Mask) | Qt::AvoidDither );
          *dst = dstconv.convertDepthWithPalette( dst->depth(),
                                        dst->colorTable(), dst->numColors() );
#endif
          return;
      }

    // Now assume palette can be ignored

    if ( dst->depth() != src->depth() ) {
      if ( sw == src->width() && sh == src->height() || dst->depth()==32 ) {
          QImage srcconv = src->convertDepth( dst->depth(), conversion_flags );
          bitBlt( dst, dx, dy, &srcconv, sx, sy, sw, sh, conversion_flags );
      } else {
          QImage srcconv = src->copy( sx, sy, sw, sh ); // ie. bitBlt
          bitBlt( dst, dx, dy, &srcconv, 0, 0, sw, sh, conversion_flags );
      }
      return;
    }

    // Now assume both are the same depth.

    // Now assume both are 32-bit or 8-bit with compatible palettes.

    // "Easy"

    switch ( dst->depth() ) {
    case 1:
      {
          uchar* d = dst->scanLine(dy) + dx/8;
          uchar* s = src->scanLine(sy) + sx/8;
          const int bw = (sw+7)/8;
          if ( bw < 64 ) {
            // Trust ourselves
            const int dd = dst->bytesPerLine() - bw;
            const int ds = src->bytesPerLine() - bw;
            while ( sh-- ) {
                for ( int t=bw; t--; )
                  *d++ = *s++;
                d += dd;
                s += ds;
            }
          } else {
            // Trust libc
            const int dd = dst->bytesPerLine();
            const int ds = src->bytesPerLine();
            while ( sh-- ) {
                memcpy( d, s, bw );
                d += dd;
                s += ds;
            }
          }
      }
      break;
    case 8:
      {
          uchar* d = dst->scanLine(dy) + dx;
          uchar* s = src->scanLine(sy) + sx;
          if ( sw < 64 ) {
            // Trust ourselves
            const int dd = dst->bytesPerLine() - sw;
            const int ds = src->bytesPerLine() - sw;
            while ( sh-- ) {
                for ( int t=sw; t--; )
                  *d++ = *s++;
                d += dd;
                s += ds;
            }
          } else {
            // Trust libc
            const int dd = dst->bytesPerLine();
            const int ds = src->bytesPerLine();
            while ( sh-- ) {
                memcpy( d, s, sw );
                d += dd;
                s += ds;
            }
          }
      }
      break;
#ifndef QT_NO_IMAGE_TRUECOLOR
    case 32:
      if ( src->hasAlphaBuffer() ) {
          QRgb* d = (QRgb*)dst->scanLine(dy) + dx;
          QRgb* s = (QRgb*)src->scanLine(sy) + sx;
          const int dd = dst->width() - sw;
          const int ds = src->width() - sw;
          while ( sh-- ) {
            for ( int t=sw; t--; ) {
                unsigned char a = qAlpha(*s);
                if ( a == 255 )
                  *d++ = *s++;
                else if ( a == 0 )
                  ++d,++s; // nothing
                else {
                  unsigned char r = ((qRed(*s)-qRed(*d)) * a) / 256 + qRed(*d);
                  unsigned char g = ((qGreen(*s)-qGreen(*d)) * a) / 256 + qGreen(*d);
                  unsigned char b = ((qBlue(*s)-qBlue(*d)) * a) / 256 + qBlue(*d);
                  a = QMAX(qAlpha(*d),a); // alternatives...
                  *d++ = qRgba(r,g,b,a);
                  ++s;
                }
            }
            d += dd;
            s += ds;
          }
      } else {
          QRgb* d = (QRgb*)dst->scanLine(dy) + dx;
          QRgb* s = (QRgb*)src->scanLine(sy) + sx;
          if ( sw < 64 ) {
            // Trust ourselves
            const int dd = dst->width() - sw;
            const int ds = src->width() - sw;
            while ( sh-- ) {
                for ( int t=sw; t--; )
                  *d++ = *s++;
                d += dd;
                s += ds;
            }
          } else {
            // Trust libc
            const int dd = dst->width();
            const int ds = src->width();
            const int b = sw*sizeof(QRgb);
            while ( sh-- ) {
                memcpy( d, s, b );
                d += dd;
                s += ds;
            }
          }
      }
      break;
#endif // QT_NO_IMAGE_TRUECOLOR
    }
}


/*!
    Returns TRUE if this image and image \a i have the same contents;
    otherwise returns FALSE. The comparison can be slow, unless there
    is some obvious difference, such as different widths, in which
    case the function will return quickly.

    \sa operator=()
*/

06239 bool QImage::operator==( const QImage & i ) const
{
    // same object, or shared?
    if ( i.data == data )
      return TRUE;
    // obviously different stuff?
    if ( i.data->h != data->h ||
       i.data->w != data->w )
      return FALSE;
    // not equal if one has alphabuffer and the other does not
    if ( i.hasAlphaBuffer() != hasAlphaBuffer() )
        return FALSE;
    // that was the fast bit...
    QImage i1 = convertDepth( 32 );
    QImage i2 = i.convertDepth( 32 );
    int l;
    // if no alpha buffer used, there might still be junk in the
    // alpha bits; thus, we can't do memcmp-style comparison of scanlines
    if ( !hasAlphaBuffer() ) {
        int m;
        QRgb *i1line;
        QRgb *i2line;
        for( l=0; l < data->h; l++ ) {
            i1line = (uint *)i1.scanLine( l );
            i2line = (uint *)i2.scanLine( l );
            // compare pixels of scanline individually
            for ( m=0; m < data->w; m++ )
                if ( (i1line[m] ^ i2line[m]) & 0x00FFFFFF )
                    return FALSE;
        }
    } else {
        // yay, we can do fast binary comparison on entire scanlines
        for( l=0; l < data->h; l++ )
            if ( memcmp( i1.scanLine( l ), i2.scanLine( l ), 4*data->w ) )
              return FALSE;
    }
    return TRUE;
}


/*!
    Returns TRUE if this image and image \a i have different contents;
    otherwise returns FALSE. The comparison can be slow, unless there
    is some obvious difference, such as different widths, in which
    case the function will return quickly.

    \sa operator=()
*/

06288 bool QImage::operator!=( const QImage & i ) const
{
    return !(*this == i);
}




/*!
    \fn int QImage::dotsPerMeterX() const

    Returns the number of pixels that fit horizontally in a physical
    meter. This and dotsPerMeterY() define the intended scale and
    aspect ratio of the image.

    \sa setDotsPerMeterX()
*/

/*!
    \fn int QImage::dotsPerMeterY() const

    Returns the number of pixels that fit vertically in a physical
    meter. This and dotsPerMeterX() define the intended scale and
    aspect ratio of the image.

    \sa setDotsPerMeterY()
*/

/*!
    Sets the value returned by dotsPerMeterX() to \a x.
*/
06319 void QImage::setDotsPerMeterX(int x)
{
    data->dpmx = x;
}

/*!
    Sets the value returned by dotsPerMeterY() to \a y.
*/
06327 void QImage::setDotsPerMeterY(int y)
{
    data->dpmy = y;
}

/*!
    \fn QPoint QImage::offset() const

    Returns the number of pixels by which the image is intended to be
    offset by when positioning relative to other images.
*/

/*!
    Sets the value returned by offset() to \a p.
*/
06342 void QImage::setOffset(const QPoint& p)
{
    data->offset = p;
}
#ifndef QT_NO_IMAGE_TEXT
/*!
    \internal

    Returns the internal QImageDataMisc object. This object will be
    created if it doesn't already exist.
*/
06353 QImageDataMisc& QImage::misc() const
{
    if ( !data->misc )
      data->misc = new QImageDataMisc;
    return *data->misc;
}

/*!
    Returns the string recorded for the keyword \a key in language \a
    lang, or in a default language if \a lang is 0.
*/
06364 QString QImage::text(const char* key, const char* lang) const
{
    QImageTextKeyLang x(key,lang);
    return misc().text_lang[x];
}

/*!
    \overload

    Returns the string recorded for the keyword and language \a kl.
*/
06375 QString QImage::text(const QImageTextKeyLang& kl) const
{
    return misc().text_lang[kl];
}

/*!
    Returns the language identifiers for which some texts are
    recorded.

    Note that if you want to iterate over the list, you should iterate
    over a copy, e.g.
    \code
    QStringList list = myImage.textLanguages();
    QStringList::Iterator it = list.begin();
    while( it != list.end() ) {
      myProcessing( *it );
      ++it;
    }
    \endcode

    \sa textList() text() setText() textKeys()
*/
06397 QStringList QImage::textLanguages() const
{
    if ( !data->misc )
      return QStringList();
    return misc().languages();
}

/*!
    Returns the keywords for which some texts are recorded.

    Note that if you want to iterate over the list, you should iterate
    over a copy, e.g.
    \code
    QStringList list = myImage.textKeys();
    QStringList::Iterator it = list.begin();
    while( it != list.end() ) {
      myProcessing( *it );
      ++it;
    }
    \endcode

    \sa textList() text() setText() textLanguages()
*/
06420 QStringList QImage::textKeys() const
{
    if ( !data->misc )
      return QStringList();
    return misc().keys();
}

/*!
    Returns a list of QImageTextKeyLang objects that enumerate all the
    texts key/language pairs set by setText() for this image.

    Note that if you want to iterate over the list, you should iterate
    over a copy, e.g.
    \code
    QValueList<QImageTextKeyLang> list = myImage.textList();
    QValueList<QImageTextKeyLang>::Iterator it = list.begin();
    while( it != list.end() ) {
      myProcessing( *it );
      ++it;
    }
    \endcode
*/
06442 QValueList<QImageTextKeyLang> QImage::textList() const
{
    if ( !data->misc )
      return QValueList<QImageTextKeyLang>();
    return misc().list();
}

/*!
    Records string \a s for the keyword \a key. The \a key should be a
    portable keyword recognizable by other software - some suggested
    values can be found in \link
    http://www.libpng.org/pub/png/spec/1.2/png-1.2-pdg.html#C.Anc-text
    the PNG specification \endlink. \a s can be any text. \a lang
    should specify the language code (see
    \link http://www.rfc-editor.org/rfc/rfc1766.txt RFC 1766 \endlink) or 0.
*/
06458 void QImage::setText(const char* key, const char* lang, const QString& s)
{
    QImageTextKeyLang x(key,lang);
    misc().text_lang.replace(x,s);
}

#endif // QT_NO_IMAGE_TEXT

#ifdef Q_WS_QWS
/*!
    \internal
*/
QGfx * QImage::graphicsContext()
{
    QGfx * ret=0;
    if(depth()) {
      int w = qt_screen->mapToDevice( QSize(width(),height()) ).width();
      int h = qt_screen->mapToDevice( QSize(width(),height()) ).height();
      ret=QGfx::createGfx(depth(),bits(),w,h,bytesPerLine());
    } else {
      qDebug("Trying to create image for null depth");
      return 0;
    }
    if(depth()<=8) {
      QRgb * tmp=colorTable();
      int nc=numColors();
      if(tmp==0) {
          static QRgb table[2] = { qRgb(255,255,255), qRgb(0,0,0) };
          tmp=table;
          nc=2;
      }
      ret->setClut(tmp,nc);
    }
    return ret;
}

#endif

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