unsigned ImageDecoder::frameBytesAtIndex(size_t index, SubsamplingLevel subsamplingLevel) const
{
if (!m_nativeDecoder)
return 0;
auto frameSize = frameSizeAtIndex(index, subsamplingLevel);
return (frameSize.area() * 4).unsafeGet();
}
IntSize ImageSource::frameSizeAtIndex(size_t index, ImageOrientationDescription description) const
{
RetainPtr<CFDictionaryRef> properties = adoptCF(CGImageSourceCopyPropertiesAtIndex(m_decoder, index, imageSourceOptions(SkipMetadata)));
if (!properties)
return IntSize();
int w = 0, h = 0;
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(properties.get(), kCGImagePropertyPixelWidth);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &w);
num = (CFNumberRef)CFDictionaryGetValue(properties.get(), kCGImagePropertyPixelHeight);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &h);
#if PLATFORM(IOS)
if (!m_isProgressive) {
CFDictionaryRef jfifProperties = static_cast<CFDictionaryRef>(CFDictionaryGetValue(properties.get(), kCGImagePropertyJFIFDictionary));
if (jfifProperties) {
CFBooleanRef isProgCFBool = static_cast<CFBooleanRef>(CFDictionaryGetValue(jfifProperties, kCGImagePropertyJFIFIsProgressive));
if (isProgCFBool)
m_isProgressive = CFBooleanGetValue(isProgCFBool);
// Workaround for <rdar://problem/5184655> - Hang rendering very large progressive JPEG. Decoding progressive
// images hangs for a very long time right now. Until this is fixed, don't sub-sample progressive images. This
// will cause them to fail our large image check and they won't be decoded.
// FIXME: Remove once underlying issue is fixed (<rdar://problem/5191418>)
}
}
if ((m_baseSubsampling == 0) && !m_isProgressive) {
IntSize subsampledSize(w, h);
const int cMaximumImageSizeBeforeSubsampling = 5 * 1024 * 1024;
while ((m_baseSubsampling < 3) && subsampledSize.width() * subsampledSize.height() > cMaximumImageSizeBeforeSubsampling) {
// We know the size, but the actual image is very large and should be sub-sampled.
// Increase the base subsampling and ask for the size again. If the image can be subsampled, the size will be
// greatly reduced. 4x sub-sampling will make us support up to 320MP (5MP * 4^3) images, which should be plenty.
// There's no callback from ImageIO when the size is available, so we do the check when we happen
// to check the size and its non - zero.
// Note: Some clients of this class don't call isSizeAvailable() so we can't rely on that.
++m_baseSubsampling;
subsampledSize = frameSizeAtIndex(index, description.respectImageOrientation());
}
w = subsampledSize.width();
h = subsampledSize.height();
}
#endif
if ((description.respectImageOrientation() == RespectImageOrientation) && orientationFromProperties(properties.get()).usesWidthAsHeight())
return IntSize(h, w);
return IntSize(w, h);
}
size_t ImageDecoder::frameBytesAtIndex(size_t index) const {
if (index >= m_frameBufferCache.size() ||
m_frameBufferCache[index].getStatus() == ImageFrame::FrameEmpty)
return 0;
struct ImageSize {
explicit ImageSize(IntSize size) {
area = static_cast<uint64_t>(size.width()) * size.height();
}
uint64_t area;
};
return ImageSize(frameSizeAtIndex(index)).area *
sizeof(ImageFrame::PixelData);
}
IntSize ImageSource::originalSize(RespectImageOrientationEnum shouldRespectOrientation) const
{
frameSizeAtIndex(0, shouldRespectOrientation);
RetainPtr<CFDictionaryRef> properties = adoptCF(CGImageSourceCopyPropertiesAtIndex(m_decoder, 0, imageSourceOptions(SkipMetadata, -1)));
if (!properties)
return IntSize();
int width = 0;
int height = 0;
CFNumberRef number = (CFNumberRef)CFDictionaryGetValue(properties.get(), kCGImagePropertyPixelWidth);
if (number)
CFNumberGetValue(number, kCFNumberIntType, &width);
number = static_cast<CFNumberRef>(CFDictionaryGetValue(properties.get(), kCGImagePropertyPixelHeight));
if (number)
CFNumberGetValue(number, kCFNumberIntType, &height);
if ((shouldRespectOrientation == RespectImageOrientation) && orientationFromProperties(properties.get()).usesWidthAsHeight())
return IntSize(height, width);
return IntSize(width, height);
}
IntSize ImageSource::size() const
{
return frameSizeAtIndex(0);
}
unsigned ImageDecoder::frameBytesAtIndex(size_t index, SubsamplingLevel subsamplingLevel) const
{
IntSize frameSize = frameSizeAtIndex(index, subsamplingLevel);
return (frameSize.area() * 4).unsafeGet();
}
unsigned ImageSource::frameBytesAtIndex(size_t index, SubsamplingLevel subsamplingLevel) const
{
IntSize frameSize = frameSizeAtIndex(index, subsamplingLevel, ImageOrientationDescription(RespectImageOrientation));
return frameSize.width() * frameSize.height() * 4;
}
IntSize ImageSource::size(ImageOrientationDescription description) const
{
return frameSizeAtIndex(0, 0, description);
}
IntSize ImageSource::size(RespectImageOrientationEnum shouldRespectOrientation) const
{
return frameSizeAtIndex(0, shouldRespectOrientation);
}
size_t ImageDecoder::frameBytesAtIndex(size_t index) const
{
if (index >= m_frameBufferCache.size() || m_frameBufferCache[index].status() == ImageFrame::FrameEmpty)
return 0;
return frameSizeAtIndex(index).area() * sizeof(ImageFrame::PixelData);
}
unsigned ImageSource::frameBytesAtIndex(size_t index) const
{
IntSize frameSize = frameSizeAtIndex(index, RespectImageOrientation);
return frameSize.width() * frameSize.height() * 4;
}
