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
AnimationSurfaceProvider::Run()
{
MutexAutoLock lock(mDecodingMutex);
if (!mDecoder || !mImage) {
MOZ_ASSERT_UNREACHABLE("Running after decoding finished?");
return;
}
while (true) {
// Run the decoder.
LexerResult result = mDecoder->Decode(WrapNotNull(this));
if (result.is<TerminalState>()) {
// We may have a new frame now, but it's not guaranteed - a decoding
// failure or truncated data may mean that no new frame got produced.
// Since we're not sure, rather than call CheckForNewFrameAtYield() here
// we call CheckForNewFrameAtTerminalState(), which handles both of these
// possibilities.
CheckForNewFrameAtTerminalState();
// We're done!
FinishDecoding();
return;
}
// Notify for the progress we've made so far.
if (mDecoder->HasProgress()) {
NotifyProgress(WrapNotNull(mImage), WrapNotNull(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;
}
// There's new output available - a new frame! Grab it.
MOZ_ASSERT(result == LexerResult(Yield::OUTPUT_AVAILABLE));
CheckForNewFrameAtYield();
}
}
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
AnonymousDecodingTask::Run()
{
while (true) {
LexerResult result = mDecoder->Decode(WrapNotNull(this));
if (result.is<TerminalState>()) {
return; // We're done.
}
if (result == LexerResult(Yield::NEED_MORE_DATA)) {
// We can't make any more progress right now. Let the caller decide how to
// handle it.
return;
}
// Right now we don't do anything special for other kinds of yields, so just
// keep working.
MOZ_ASSERT(result.is<Yield>());
}
}
void
DecodedSurfaceProvider::Run()
{
MutexAutoLock lock(mMutex);
if (!mDecoder || !mImage) {
MOZ_ASSERT_UNREACHABLE("Running after decoding finished?");
return;
}
// Run the decoder.
LexerResult result = mDecoder->Decode(WrapNotNull(this));
// If there's a new surface available, announce it to the surface cache.
CheckForNewSurface();
if (result.is<TerminalState>()) {
FinishDecoding();
return; // We're done.
}
// Notify for the progress we've made so far.
if (mDecoder->HasProgress()) {
NotifyProgress(WrapNotNull(mImage), WrapNotNull(mDecoder));
}
MOZ_ASSERT(result.is<Yield>());
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;
}
// Single-frame images shouldn't yield for any reason except NEED_MORE_DATA.
MOZ_ASSERT_UNREACHABLE("Unexpected yield for single-frame image");
mDecoder->TerminateFailure();
FinishDecoding();
}