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Gecko:Layers: Difference between revisions
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→Rendering Layers To Arbitrary Cairo Targets
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To support drawWindow and printing, we need to be able to draw a layer tree to any target, with maximum possible fidelity. | To support drawWindow and printing, we need to be able to draw a layer tree to any target, with maximum possible fidelity. | ||
For printing, it would be enough to create a LayerManager for a destination gfxContext* and build a new set of layers for it. This would use the immediate-mode implementation described above. This implies that we need to have multiple implementations compiled in. Also, even if we disable 3D rendering on non-accelerated systems, we'll still want to have a complete software fallback (using pixman transforms?) for printing. | |||
For drawWindow, we probably want the ability to retarget an existing set of layers to draw them to a different context. | |||
Maybe we should add to LayerManager a method | |||
void beginTransactionWithTarget(gfxContext* aDestination); | |||
and a way to construct a LayerManager with a device context for printing. When you end the transaction started with beginTransactionWithTarget, everything is guaranteed to have been rendered to the destination context. | |||
= Jeff = | = Jeff = | ||