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Bug 1575828: Ensure that CanvasChild::GetDataSurface is called on the main thread. r=jrmuizel

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This also makes sure the SourceSurfaceCanvasRecording clean-up is done on the
main thread where required.

Differential Revision: https://phabricator.services.mozilla.com/D43077

--HG--
extra : moz-landing-system : lando
This commit is contained in:
Bob Owen 2019-09-10 02:06:46 +00:00
parent 7d5ad55fe0
commit 4a393ad08e
2 changed files with 37 additions and 8 deletions
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6
gfx/layers/RecordedCanvasEventImpl.h
View File

@ -374,8 +374,8 @@ RecordedGetDataForSurface::RecordedGetDataForSurface(S& aStream)
class RecordedAddSurfaceAlias final
: public RecordedEventDerived<RecordedAddSurfaceAlias> {
public:
RecordedAddSurfaceAlias(const gfx::SourceSurface* aSurfaceAlias,
const gfx::SourceSurface* aActualSurface)
RecordedAddSurfaceAlias(ReferencePtr aSurfaceAlias,
const RefPtr<gfx::SourceSurface>& aActualSurface)
: RecordedEventDerived(ADD_SURFACE_ALIAS),
mSurfaceAlias(aSurfaceAlias),
mActualSurface(aActualSurface) {}
@ -423,7 +423,7 @@ RecordedAddSurfaceAlias::RecordedAddSurfaceAlias(S& aStream)
class RecordedRemoveSurfaceAlias final
: public RecordedEventDerived<RecordedRemoveSurfaceAlias> {
public:
explicit RecordedRemoveSurfaceAlias(const gfx::SourceSurface* aSurfaceAlias)
explicit RecordedRemoveSurfaceAlias(ReferencePtr aSurfaceAlias)
: RecordedEventDerived(REMOVE_SURFACE_ALIAS),
mSurfaceAlias(aSurfaceAlias) {}

39
gfx/layers/ipc/CanvasChild.cpp
View File

@ -51,8 +51,8 @@ class SourceSurfaceCanvasRecording final : public gfx::SourceSurface {
}
~SourceSurfaceCanvasRecording() {
mRecorder->RemoveStoredObject(this);
mRecorder->RecordEvent(RecordedRemoveSurfaceAlias(this));
ReleaseOnMainThread(std::move(mRecorder), this, std::move(mRecordedSurface),
std::move(mCanvasChild));
}
gfx::SurfaceType GetType() const final { return mRecordedSurface->GetType(); }
@ -64,11 +64,40 @@ class SourceSurfaceCanvasRecording final : public gfx::SourceSurface {
}
already_AddRefed<gfx::DataSourceSurface> GetDataSurface() final {
if (!mDataSourceSurface) {
EnsureDataSurfaceOnMainThread();
return do_AddRef(mDataSourceSurface);
}
protected:
void GuaranteePersistance() final { EnsureDataSurfaceOnMainThread(); }
private:
void EnsureDataSurfaceOnMainThread() {
// The data can only be retrieved on the main thread.
if (!mDataSourceSurface && NS_IsMainThread()) {
mDataSourceSurface = mCanvasChild->GetDataSurface(mRecordedSurface);
}
}
return do_AddRef(mDataSourceSurface);
// Used to ensure that clean-up that requires it is done on the main thread.
static void ReleaseOnMainThread(RefPtr<CanvasDrawEventRecorder> aRecorder,
ReferencePtr aSurfaceAlias,
RefPtr<gfx::SourceSurface> aAliasedSurface,
RefPtr<CanvasChild> aCanvasChild) {
if (!NS_IsMainThread()) {
NS_DispatchToMainThread(NewRunnableFunction(
"SourceSurfaceCanvasRecording::ReleaseOnMainThread",
SourceSurfaceCanvasRecording::ReleaseOnMainThread,
std::move(aRecorder), aSurfaceAlias, std::move(aAliasedSurface),
std::move(aCanvasChild)));
return;
}
aRecorder->RemoveStoredObject(aSurfaceAlias);
aRecorder->RecordEvent(RecordedRemoveSurfaceAlias(aSurfaceAlias));
aAliasedSurface = nullptr;
aCanvasChild = nullptr;
aRecorder = nullptr;
}
RefPtr<gfx::SourceSurface> mRecordedSurface;
@ -191,7 +220,7 @@ void CanvasChild::RecordEvent(const gfx::RecordedEvent& aEvent) {
already_AddRefed<gfx::DataSourceSurface> CanvasChild::GetDataSurface(
const gfx::SourceSurface* aSurface) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aSurface);
if (!mRecorder) {