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Backed out changeset 775fa3ede160 (bug 1294351) for failing in crashtest 647480.html. r=backout

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This commit is contained in:
Sebastian Hengst 2016-08-18 12:50:56 +02:00
parent 5b24ece193
commit 7ab46a480a
2 changed files with 26 additions and 40 deletions
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56
dom/canvas/CanvasRenderingContext2D.cpp
View File

@ -1645,27 +1645,25 @@ CanvasRenderingContext2D::EnsureTarget(const gfx::Rect* aCoveredRect,
Redraw();
}
if (!mBufferProvider->PreservesDrawingState() || mBufferProvider != oldBufferProvider) {
// Restore clips and transform.
mTarget->SetTransform(Matrix());
// Restore clips and transform.
mTarget->SetTransform(Matrix());
if (mTarget->GetBackendType() == gfx::BackendType::CAIRO) {
// Cairo doesn't play well with huge clips. When given a very big clip it
// will try to allocate big mask surface without taking the target
// size into account which can cause OOM. See bug 1034593.
// This limits the clip extents to the size of the canvas.
// A fix in Cairo would probably be preferable, but requires somewhat
// invasive changes.
mTarget->PushClipRect(canvasRect);
}
if (mTarget->GetBackendType() == gfx::BackendType::CAIRO) {
// Cairo doesn't play well with huge clips. When given a very big clip it
// will try to allocate big mask surface without taking the target
// size into account which can cause OOM. See bug 1034593.
// This limits the clip extents to the size of the canvas.
// A fix in Cairo would probably be preferable, but requires somewhat
// invasive changes.
mTarget->PushClipRect(canvasRect);
}
for (const auto& style : mStyleStack) {
for (const auto& clipOrTransform : style.clipsAndTransforms) {
if (clipOrTransform.IsClip()) {
mTarget->PushClip(clipOrTransform.clip);
} else {
mTarget->SetTransform(clipOrTransform.transform);
}
for (const auto& style : mStyleStack) {
for (const auto& clipOrTransform : style.clipsAndTransforms) {
if (clipOrTransform.IsClip()) {
mTarget->PushClip(clipOrTransform.clip);
} else {
mTarget->SetTransform(clipOrTransform.transform);
}
}
}
@ -1778,20 +1776,18 @@ CanvasRenderingContext2D::ReturnTarget()
{
if (mTarget && mBufferProvider && mTarget != sErrorTarget) {
CurrentState().transform = mTarget->GetTransform();
if (!mBufferProvider->PreservesDrawingState()) {
for (const auto& style : mStyleStack) {
for (const auto& clipOrTransform : style.clipsAndTransforms) {
if (clipOrTransform.IsClip()) {
mTarget->PopClip();
}
for (const auto& style : mStyleStack) {
for (const auto& clipOrTransform : style.clipsAndTransforms) {
if (clipOrTransform.IsClip()) {
mTarget->PopClip();
}
}
}
if (mTarget->GetBackendType() == gfx::BackendType::CAIRO) {
// With the cairo backend we pushed an extra clip rect which we have to
// balance out here. See the comment in EnsureDrawTarget.
mTarget->PopClip();
}
if (mTarget->GetBackendType() == gfx::BackendType::CAIRO) {
// With the cairo backend we pushed an extra clip rect which we have to
// balance out here. See the comment in EnsureDrawTarget.
mTarget->PopClip();
}
mBufferProvider->ReturnDrawTarget(mTarget.forget());

10
gfx/layers/PersistentBufferProvider.h
View File

@ -65,14 +65,6 @@ public:
virtual void OnShutdown() {}
virtual bool SetForwarder(CompositableForwarder* aFwd) { return true; }
/**
* Return true if this provider preserves the drawing state (clips, transforms,
* etc.) across frames. In practice this means users of the provider can skip
* popping all of the clips at the end of the frames and pushing them back at
* the beginning of the following frames, which can be costly (cf. bug 1294351).
*/
virtual bool PreservesDrawingState() const = 0;
};
@ -96,7 +88,6 @@ public:
virtual void ReturnSnapshot(already_AddRefed<gfx::SourceSurface> aSnapshot) override;
virtual bool PreservesDrawingState() const override { return true; }
private:
~PersistentBufferProviderBasic();
@ -137,7 +128,6 @@ public:
virtual bool SetForwarder(CompositableForwarder* aFwd) override;
virtual bool PreservesDrawingState() const override { return false; }
protected:
PersistentBufferProviderShared(gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
CompositableForwarder* aFwd,