diff options
| -rw-r--r-- | src/plugins/imageformats/gif/qgifhandler.cpp | 40 |
1 files changed, 26 insertions, 14 deletions
diff --git a/src/plugins/imageformats/gif/qgifhandler.cpp b/src/plugins/imageformats/gif/qgifhandler.cpp index c95b63c..dee0e52 100644 --- a/src/plugins/imageformats/gif/qgifhandler.cpp +++ b/src/plugins/imageformats/gif/qgifhandler.cpp @@ -54,6 +54,10 @@ QT_BEGIN_NAMESPACE #define Q_TRANSPARENT 0x00ffffff +// avoid going through QImage::scanLine() which calls detach +#define FAST_SCAN_LINE(bits, bpl, y) (bits + (y) * bpl) + + /* Incremental image decoder for GIF image format. @@ -135,7 +139,7 @@ private: int frame; bool out_of_bounds; bool digress; - void nextY(QImage *image); + void nextY(unsigned char *bits, int bpl); void disposePrevious(QImage *image); }; @@ -232,6 +236,10 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length, // CompuServe Incorporated. GIF(sm) is a Service Mark property of // CompuServe Incorporated." + image->detach(); + int bpl = image->bytesPerLine(); + unsigned char *bits = image->bits(); + #define LM(l, m) (((m)<<8)|l) digress = false; const int initial = length; @@ -335,7 +343,9 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length, QImage::Format format = trans_index >= 0 ? QImage::Format_ARGB32 : QImage::Format_RGB32; if (image->isNull()) { (*image) = QImage(swidth, sheight, format); - memset(image->bits(), 0, image->byteCount()); + bpl = image->bytesPerLine(); + bits = image->bits(); + memset(bits, 0, image->byteCount()); // ### size of the upcoming frame, should rather // be known before decoding it. @@ -393,11 +403,13 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length, backingstore = QImage(qMax(backingstore.width(), w), qMax(backingstore.height(), h), QImage::Format_RGB32); - memset(image->bits(), 0, image->byteCount()); + memset(bits, 0, image->byteCount()); } + const int dest_bpl = backingstore.bytesPerLine(); + unsigned char *dest_data = backingstore.bits(); for (int ln=0; ln<h; ln++) { - memcpy(backingstore.scanLine(ln), - image->scanLine(t+ln)+l, w*sizeof(QRgb)); + memcpy(FAST_SCAN_LINE(dest_data, dest_bpl, ln), + FAST_SCAN_LINE(bits, bpl, t+ln) + l, w*sizeof(QRgb)); } } @@ -470,14 +482,14 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length, if (needfirst) { firstcode=oldcode=code; if (!out_of_bounds && image->height() > y && firstcode!=trans_index) - ((QRgb*)image->scanLine(y))[x] = color(firstcode); + ((QRgb*)FAST_SCAN_LINE(bits, bpl, y))[x] = color(firstcode); x++; if (x>=swidth) out_of_bounds = true; needfirst=false; if (x>=left+width) { x=left; out_of_bounds = left>=swidth || y>=sheight; - nextY(image); + nextY(bits, bpl); } } else { incode=code; @@ -515,7 +527,7 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length, const QRgb *map = lcmap ? localcmap : globalcmap; QRgb *line = 0; if (!out_of_bounds && h > y) - line = (QRgb*)image->scanLine(y); + line = (QRgb*)FAST_SCAN_LINE(bits, bpl, y); while (sp>stack) { const uchar index = *(--sp); if (!out_of_bounds && h > y && index!=trans_index) { @@ -529,9 +541,9 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length, if (x>=left+width) { x=left; out_of_bounds = left>=swidth || y>=sheight; - nextY(image); + nextY(bits, bpl); if (!out_of_bounds && h > y) - line = (QRgb*)image->scanLine(y); + line = (QRgb*)FAST_SCAN_LINE(bits, bpl, y); } } } @@ -644,7 +656,7 @@ void QGIFFormat::fillRect(QImage *image, int col, int row, int w, int h, QRgb co } } -void QGIFFormat::nextY(QImage *image) +void QGIFFormat::nextY(unsigned char *bits, int bpl) { int my; switch (interlace) { @@ -660,7 +672,7 @@ void QGIFFormat::nextY(QImage *image) // Don't dup with transparency if (trans_index < 0) { for (i=1; i<=my; i++) { - memcpy(image->scanLine(y+i)+left*sizeof(QRgb), image->scanLine(y)+left*sizeof(QRgb), + memcpy(FAST_SCAN_LINE(bits, bpl, y+i)+left*sizeof(QRgb), FAST_SCAN_LINE(bits, bpl, y)+left*sizeof(QRgb), (right-left+1)*sizeof(QRgb)); } } @@ -689,7 +701,7 @@ void QGIFFormat::nextY(QImage *image) // Don't dup with transparency if (trans_index < 0) { for (i=1; i<=my; i++) { - memcpy(image->scanLine(y+i)+left*sizeof(QRgb), image->scanLine(y)+left*sizeof(QRgb), + memcpy(FAST_SCAN_LINE(bits, bpl, y+i)+left*sizeof(QRgb), FAST_SCAN_LINE(bits, bpl, y)+left*sizeof(QRgb), (right-left+1)*sizeof(QRgb)); } } @@ -713,7 +725,7 @@ void QGIFFormat::nextY(QImage *image) // Don't dup with transparency if (trans_index < 0) { for (i=1; i<=my; i++) { - memcpy(image->scanLine(y+i)+left*sizeof(QRgb), image->scanLine(y)+left*sizeof(QRgb), + memcpy(FAST_SCAN_LINE(bits, bpl, y+i)+left*sizeof(QRgb), FAST_SCAN_LINE(bits, bpl, y)+left*sizeof(QRgb), (right-left+1)*sizeof(QRgb)); } } |