/**************************************************************************** ** ** Implementation of QImage and QImageIO classes ** ** Created : 950207 ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial 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 WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #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 #include "qimageformatinterface_p.h" #include "qwmatrix.h" #include "qapplication.h" #include "qmime.h" #include "qdragobject.h" #include #include #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 list() { return text_lang.keys(); } QStringList languages() { QStringList r; QMap::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::Iterator it = text_lang.begin(); for ( ; it != text_lang.end(); ++it ) { r.remove( it.key().key ); r.append( it.key().key ); } return r; } QMap 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() */ 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() */ 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() */ 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 */ 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. */ 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() */ QImage::QImage( const QByteArray &array ) { init(); loadFromData(array); } #endif //QT_NO_IMAGEIO /*! Constructs a \link shclass.html shallow copy\endlink of \a image. */ 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. */ 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; jbits = 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; jbits = jt; data->bitordr = bitOrder; } #endif // Q_WS_QWS /*! Destroys the image and cleans up. */ 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 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() */ 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(). */ 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() */ void QImage::detach() { if ( data->count != 1 ) *this = copy(); } /*! Returns a \link shclass.html deep copy\endlink of the image. \sa detach() */ 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 */ 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. */ 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() */ 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 // needed for systemBitOrder #include #include #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() */ 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() */ 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() */ 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() */ 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 ) */ 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. */ 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. */ 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; yheight(); 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; isetNumColors( 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[sw]; line2[0] = new int[sw]; line1[1] = new int[sw]; line2[1] = new int[sw]; line1[2] = new int[sw]; line2[2] = new int[sw]; 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; iheight() ) { for (int i=0; i>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; xhasAlphaBuffer() ) { 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>= 1)) { bit = 0x80; while ( xcreate(src->width(), src->height(), 32) ) return FALSE; // create failed dst->setAlphaBuffer( src->hasAlphaBuffer() ); for ( int y=0; yheight(); 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; yheight(); 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; xwidth(); x++ ) { *p++ = src->color( (*b >> (7 - (x & 7))) & 1 ); if ( (x & 7) == 7 ) b++; } } else { for ( x=0; xwidth(); 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; yheight(); 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; xwidth(); x++ ) { *p++ = (*b >> (7 - (x & 7))) & 1; if ( (x & 7) == 7 ) b++; } } else { for ( x=0; xwidth(); 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; inumColors(); i++ ) gray[i] = (255 - (src->color(i) >> 24)); } else { // Pixel 0x00 -> 1 pixels (black) // Pixel 0xFF -> 0 pixels (white) for ( int i=0; inumColors(); 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; yscanLine(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; ifill( 0 ); uchar** mline = dst->jumpTable(); #ifndef QT_NO_IMAGE_TRUECOLOR if ( d == 32 ) { uint** line = (uint**)src->jumpTable(); for ( int i=0; i> 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; ifill( 0 ); uchar** mline = dst->jumpTable(); #ifndef QT_NO_IMAGE_TRUECOLOR if ( d == 32 ) { uint** line = (uint**)src->jumpTable(); for ( int i=0; i> 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> 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; yheight(); 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; yheight(); 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() */ 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 */ 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() */ 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() */ 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() */ 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() */ 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() */ 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() */ 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; ictbl[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() */ 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; ictbl[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() */ 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. */ 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 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 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 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 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 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 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() */ 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() */ 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. */ 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. */ 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() */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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. */ 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 */ 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 */ 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 */ 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 */ 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; icolor(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. */ QImageIO::QImageIO() { init(); } /*! Constructs a QImageIO object with the I/O device \a ioDevice and a \a format tag. */ 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. */ QImageIO::QImageIO( const QString &fileName, const char* format ) : frmt(format), fname(fileName) { init(); } /*! Contains initialization common to all QImageIO constructors. */ 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. */ 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 QIHList;// list of image handlers static QIHList *imageHandlers = 0; #ifndef QT_NO_COMPONENT static QPluginManager *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( IID_QImageFormat, QApplication::libraryPaths(), "/imageformats" ); QStringList features = plugin_manager->featureList(); QStringList::Iterator it = features.begin(); while ( it != features.end() ) { QString str = *it; ++it; QInterfacePtr 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. */ 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() */ 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() */ 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() */ 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() */ 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() */ void QImageIO::setFileName( const QString &fileName ) { fname = fileName; } /*! Returns the quality of the written image, related to the compression ratio. \sa setQuality() QImage::save() */ 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() */ void QImageIO::setQuality( int q ) { d->quality = q; } /*! Returns the image's parameters string. \sa setParameters() */ 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() */ 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() */ void QImageIO::setGamma( float gamma ) { d->gamma=gamma; } /*! Returns the gamma value at which the image will be viewed. \sa setGamma() */ 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. */ 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. */ 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() */ 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. */ 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. */ 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() */ 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() */ 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 if ((w < 0) || ((w * abs(h)) > (16384 * 16384))) return FALSE; 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; ireadBlock( (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); if (((red_mask >> red_shift) + 1) == 0) return FALSE; red_scale = 256 / ((red_mask >> red_shift) + 1); green_shift = calc_shift(green_mask); if (((green_mask >> green_shift) + 1) == 0) return FALSE; green_scale = 256 / ((green_mask >> green_shift) + 1); blue_shift = calc_shift(blue_mask); if (((blue_mask >> blue_shift) + 1) == 0) return FALSE; 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> 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; iwriteBlock( (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] 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; yreadBlock( (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; yreadBlock( (char *)image.scanLine(y), pbm_bpl ) != pbm_bpl ) return; } } } else { // read ascii data register uchar *p; int n; for ( y=0; ysetImage( 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; ywriteBlock(str, str.length()) != str.length()) { iio->setStatus(1); return; } w = (w+7)/8; for (uint y=0; ywriteBlock((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; ywriteBlock((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; ywriteBlock((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) { } virtual ~QImageIOFrameGrabber() { } 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 " 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 " 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 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; ysetImage( 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 colorMap; int w = image.width(), h = image.height(), ncolors = 0; int x, y; // build color table for( y=0; y 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::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 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 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, \a 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. */ 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=() */ 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=() */ 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. */ void QImage::setDotsPerMeterX(int x) { data->dpmx = x; } /*! Sets the value returned by dotsPerMeterY() to \a y. */ 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. */ 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. */ 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. */ 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. */ 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() */ 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() */ 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 list = myImage.textList(); QValueList::Iterator it = list.begin(); while( it != list.end() ) { myProcessing( *it ); ++it; } \endcode */ QValueList QImage::textList() const { if ( !data->misc ) return QValueList(); 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. */ 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