The more I work in this space, the more I’m convinced that all major OS’s and browsers’ 2D rendering stacks should be thrown out and redone.
You should see the kind of numbers we see with WebRender. The vertex shading step is <1% of GPU time.
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And we aggressively Z-cull the whole scene. So we paint every pixel only once, modulo transparent geometry.
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If the composition results have to be written out to memory, it's less efficient (This is more so for system, not app level composition)
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