void
AnimationDecodingTask::Run()
{
while (true) {
LexerResult result = mDecoder->Decode(WrapNotNull(this));
if (result.is<TerminalState>()) {
NotifyDecodeComplete(mDecoder->GetImage(), mDecoder);
return; // We're done.
}
MOZ_ASSERT(result.is<Yield>());
// Notify for the progress we've made so far.
if (mDecoder->HasProgress()) {
NotifyProgress(mDecoder->GetImage(), mDecoder);
}
if (result == LexerResult(Yield::NEED_MORE_DATA)) {
// We can't make any more progress right now. The decoder itself will
// ensure that we get reenqueued when more data is available; just return
// for now.
return;
}
// Right now we don't do anything special for other kinds of yields, so just
// keep working.
}
}
void
MetadataDecodingTask::Run()
{
nsresult rv = mDecoder->Decode(WrapNotNull(this));
if (NS_SUCCEEDED(rv) && !mDecoder->GetDecodeDone()) {
// It's important that metadata decode results are delivered atomically, so
// we'll wait until NotifyDecodeComplete() to report any progress. We don't
// need to do anything else for this case. The decoder itself will ensure
// that we get reenqueued when more data is available.
return;
}
NotifyDecodeComplete(mDecoder);
}
void
DecodingTask::Run()
{
nsresult rv = mDecoder->Decode(WrapNotNull(this));
if (NS_SUCCEEDED(rv) && !mDecoder->GetDecodeDone()) {
// Notify for the progress we've made so far.
if (mDecoder->HasProgress()) {
NotifyProgress(mDecoder);
}
// We don't need to do anything else for this case. The decoder itself will
// ensure that we get reenqueued when more data is available.
return;
}
NotifyDecodeComplete(mDecoder);
}
void
MetadataDecodingTask::Run()
{
LexerResult result = mDecoder->Decode(WrapNotNull(this));
if (result.is<TerminalState>()) {
NotifyDecodeComplete(mDecoder->GetImage(), mDecoder);
return; // We're done.
}
if (result == LexerResult(Yield::NEED_MORE_DATA)) {
// We can't make any more progress right now. We also don't want to report
// any progress, because it's important that metadata decode results are
// delivered atomically. The decoder itself will ensure that we get
// reenqueued when more data is available; just return for now.
return;
}
MOZ_ASSERT_UNREACHABLE("Metadata decode yielded for an unexpected reason");
}
void
AnimationSurfaceProvider::FinishDecoding()
{
mDecodingMutex.AssertCurrentThreadOwns();
MOZ_ASSERT(mImage);
MOZ_ASSERT(mDecoder);
// Send notifications.
NotifyDecodeComplete(WrapNotNull(mImage), WrapNotNull(mDecoder));
// Destroy our decoder; we don't need it anymore.
mDecoder = nullptr;
// We don't need a reference to our image anymore, either, and we don't want
// one. We may be stored in the surface cache for a long time after decoding
// finishes. If we don't drop our reference to the image, we'll end up
// keeping it alive as long as we remain in the surface cache, which could
// greatly extend the image's lifetime - in fact, if the image isn't
// discardable, it'd result in a leak!
DropImageReference();
}