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Bug 593604. Part 4: Create Layer::GetSurfaceMode to help determine what kind of alpha support the layer needs. r=vlad,a=blocking
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@ -631,6 +631,20 @@ public:
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// quality.
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PRBool CanUseOpaqueSurface();
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enum SurfaceMode {
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SURFACE_OPAQUE,
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SURFACE_SINGLE_CHANNEL_ALPHA,
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SURFACE_COMPONENT_ALPHA
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};
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SurfaceMode GetSurfaceMode()
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{
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if (CanUseOpaqueSurface())
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return SURFACE_OPAQUE;
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if (mContentFlags & CONTENT_COMPONENT_ALPHA)
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return SURFACE_COMPONENT_ALPHA;
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return SURFACE_SINGLE_CHANNEL_ALPHA;
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}
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/**
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* This setter can be used anytime. The user data for all keys is
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* initially null. Ownership pases to the layer manager.
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