static
void read_png_image(QImageIO* iio)
{
png_structp png_ptr;
png_infop info_ptr;
png_infop end_info;
png_bytep* row_pointers;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
if (!png_ptr) {
iio->setStatus(-1);
return;
}
png_set_error_fn(png_ptr, 0, 0, qt_png_warning);
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, 0, 0);
iio->setStatus(-2);
return;
}
end_info = png_create_info_struct(png_ptr);
if (!end_info) {
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
iio->setStatus(-3);
return;
}
if (setjmp(png_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
iio->setStatus(-4);
return;
}
png_set_read_fn(png_ptr, (void*)iio, iod_read_fn);
png_read_info(png_ptr, info_ptr);
QImage image;
setup_qt(image, png_ptr, info_ptr, iio->gamma());
if (image.isNull()) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
iio->setStatus(-5);
return;
}
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int color_type;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
0, 0, 0);
uchar** jt = image.jumpTable();
row_pointers=new png_bytep[height];
for (uint y=0; y<height; y++) {
row_pointers[y]=jt[y];
}
png_read_image(png_ptr, row_pointers);
#if 0 // libpng takes care of this.
png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)
if (image.depth()==32 && png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
QRgb trans = 0xFF000000 | qRgb(
(info_ptr->trans_values.red << 8 >> bit_depth)&0xff,
(info_ptr->trans_values.green << 8 >> bit_depth)&0xff,
(info_ptr->trans_values.blue << 8 >> bit_depth)&0xff);
for (uint y=0; y<height; y++) {
for (uint x=0; x<info_ptr->width; x++) {
if (((uint**)jt)[y][x] == trans) {
((uint**)jt)[y][x] &= 0x00FFFFFF;
} else {
}
}
}
}
/*!
\internal
*/
bool Q_INTERNAL_WIN_NO_THROW QPngHandlerPrivate::readPngImage(QImage *outImage)
{
if (state == Error)
return false;
if (state == Ready && !readPngHeader()) {
state = Error;
return false;
}
row_pointers = 0;
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
delete [] row_pointers;
png_ptr = 0;
state = Error;
return false;
}
setup_qt(*outImage, png_ptr, info_ptr, gamma);
if (outImage->isNull()) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
delete [] row_pointers;
png_ptr = 0;
state = Error;
return false;
}
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int color_type;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
0, 0, 0);
uchar *data = outImage->bits();
int bpl = outImage->bytesPerLine();
row_pointers = new png_bytep[height];
for (uint y = 0; y < height; y++)
row_pointers[y] = data + y * bpl;
png_read_image(png_ptr, row_pointers);
#if 0 // libpng takes care of this.
png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)
if (outImage->depth()==32 && png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
QRgb trans = 0xFF000000 | qRgb(
(info_ptr->trans_values.red << 8 >> bit_depth)&0xff,
(info_ptr->trans_values.green << 8 >> bit_depth)&0xff,
(info_ptr->trans_values.blue << 8 >> bit_depth)&0xff);
for (uint y=0; y<height; y++) {
for (uint x=0; x<info_ptr->width; x++) {
if (((uint**)jt)[y][x] == trans) {
((uint**)jt)[y][x] &= 0x00FFFFFF;
} else {
}
}
}
}
bool Q_INTERNAL_WIN_NO_THROW QPngHandlerPrivate::readPngImage(QImage *outImage)
{
if (state == Error)
return false;
if (state == Ready && !readPngHeader()) {
state = Error;
return false;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
png_ptr = 0;
amp.deallocate();
state = Error;
return false;
}
bool doScaledRead = false;
setup_qt(*outImage, png_ptr, info_ptr, scaledSize, &doScaledRead, gamma, fileGamma);
if (outImage->isNull()) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
png_ptr = 0;
amp.deallocate();
state = Error;
return false;
}
if (doScaledRead) {
read_image_scaled(outImage, png_ptr, info_ptr, amp, scaledSize);
} else {
png_uint_32 width = 0;
png_uint_32 height = 0;
png_int_32 offset_x = 0;
png_int_32 offset_y = 0;
int bit_depth = 0;
int color_type = 0;
int unit_type = PNG_OFFSET_PIXEL;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y, &unit_type);
uchar *data = outImage->bits();
int bpl = outImage->bytesPerLine();
amp.row_pointers = new png_bytep[height];
for (uint y = 0; y < height; y++)
amp.row_pointers[y] = data + y * bpl;
png_read_image(png_ptr, amp.row_pointers);
amp.deallocate();
outImage->setDotsPerMeterX(png_get_x_pixels_per_meter(png_ptr,info_ptr));
outImage->setDotsPerMeterY(png_get_y_pixels_per_meter(png_ptr,info_ptr));
if (unit_type == PNG_OFFSET_PIXEL)
outImage->setOffset(QPoint(offset_x, offset_y));
// sanity check palette entries
if (color_type == PNG_COLOR_TYPE_PALETTE && outImage->format() == QImage::Format_Indexed8) {
int color_table_size = outImage->colorCount();
for (int y=0; y<(int)height; ++y) {
uchar *p = FAST_SCAN_LINE(data, bpl, y);
uchar *end = p + width;
while (p < end) {
if (*p >= color_table_size)
*p = 0;
++p;
}
}
}
}
state = ReadingEnd;
png_read_end(png_ptr, end_info);
readPngTexts(end_info);
for (int i = 0; i < readTexts.size()-1; i+=2)
outImage->setText(readTexts.at(i), readTexts.at(i+1));
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
png_ptr = 0;
amp.deallocate();
state = Ready;
if (scaledSize.isValid() && outImage->size() != scaledSize)
*outImage = outImage->scaled(scaledSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
return true;
}