зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1190210 - Part 2: Make sure the size of created ImageBitmap is the same as the intented cropping area. r=roc
--HG-- extra : rebase_source : 9a7ad9b04c39b981428d77b86222e326c42b85f6
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@ -453,14 +453,10 @@ ImageBitmap::PrepareForDrawTarget(gfx::DrawTarget* aTarget)
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IntPoint dest(std::max(0, surfPortion.X() - mPictureRect.X()),
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std::max(0, surfPortion.Y() - mPictureRect.Y()));
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// Do not initialize this target with mPictureRect.Size().
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// In the Windows8 D2D1 backend, it might trigger "partial upload" from a
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// non-SourceSurfaceD2D1 surface to a D2D1Image in the following
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// CopySurface() step. However, the "partial upload" only supports uploading
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// a rectangle starts from the upper-left point, which means it cannot
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// upload an arbitrary part of the source surface and this causes problems
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// if the mPictureRect is not starts from the upper-left point.
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target = target->CreateSimilarDrawTarget(mSurface->GetSize(),
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// We must initialize this target with mPictureRect.Size() because the
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// specification states that if the cropping area is given, then return an
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// ImageBitmap with the size equals to the cropping area.
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target = target->CreateSimilarDrawTarget(mPictureRect.Size(),
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target->GetFormat());
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if (!target) {
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@ -469,10 +465,31 @@ ImageBitmap::PrepareForDrawTarget(gfx::DrawTarget* aTarget)
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return surface.forget();
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}
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// We need to fall back to generic copying and cropping for the Windows8.1,
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// D2D1 backend.
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// In the Windows8.1 D2D1 backend, it might trigger "partial upload" from a
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// non-SourceSurfaceD2D1 surface to a D2D1Image in the following
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// CopySurface() step. However, the "partial upload" only supports uploading
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// a rectangle starts from the upper-left point, which means it cannot
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// upload an arbitrary part of the source surface and this causes problems
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// if the mPictureRect is not starts from the upper-left point.
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if (target->GetBackendType() == BackendType::DIRECT2D1_1 &&
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mSurface->GetType() != SurfaceType::D2D1_1_IMAGE) {
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RefPtr<DataSourceSurface> dataSurface = mSurface->GetDataSurface();
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if (NS_WARN_IF(!dataSurface)) {
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mSurface = nullptr;
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RefPtr<gfx::SourceSurface> surface(mSurface);
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return surface.forget();
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}
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mSurface = CropAndCopyDataSourceSurface(dataSurface, mPictureRect);
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} else {
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target->CopySurface(mSurface, surfPortion, dest);
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mSurface = target->Snapshot();
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}
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// Make mCropRect match new surface we've cropped to
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mPictureRect.MoveTo(0, 0);
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target->CopySurface(mSurface, surfPortion, dest);
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mSurface = target->Snapshot();
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}
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// Replace our surface with one optimized for the target we're about to draw
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@ -481,7 +498,6 @@ ImageBitmap::PrepareForDrawTarget(gfx::DrawTarget* aTarget)
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mSurface = target->OptimizeSourceSurface(mSurface);
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RefPtr<gfx::SourceSurface> surface(mSurface);
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return surface.forget();
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}
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