bool ImageSource::frameIsCompleteAtIndex(size_t index)
{
ASSERT(frameCount());
// CGImageSourceGetStatusAtIndex claims that all frames of a multi-frame image are incomplete
// when we've not yet received the complete data for an image that is using an incremental data
// source (<rdar://problem/7679174>). We work around this by special-casing all frames except the
// last in an image and treating them as complete if they are present and reported as being
// incomplete. We do this on the assumption that loading new data can only modify the existing last
// frame or append new frames. The last frame is only treated as being complete if the image source
// reports it as such. This ensures that it is truly the last frame of the image rather than just
// the last that we currently have data for.
CGImageSourceStatus frameStatus = CGImageSourceGetStatusAtIndex(m_decoder, index);
if (index < frameCount() - 1)
return frameStatus >= kCGImageStatusIncomplete;
return frameStatus == kCGImageStatusComplete;
}
bool ImageSource::frameIsCompleteAtIndex(size_t index)
{
return CGImageSourceGetStatusAtIndex(m_decoder, index) == kCGImageStatusComplete;
}
bool ImageDecoder::frameIsCompleteAtIndex(size_t index) const
{
ASSERT(frameCount());
return CGImageSourceGetStatusAtIndex(m_nativeDecoder.get(), index) == kCGImageStatusComplete;
}
