Reduce blitting caused by backdrop-filter
Categories
(Core :: Graphics: WebRender, enhancement, P3)
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People
(Reporter: cbrewster, Unassigned)
References
Details
To compute a filtered backdrop, we currently render the backdrop to an intermediate surface and later blit it to the backdrop root.
This isn't ideal in cases where a navbar has backdrop-filter. Usually this means the entire page (excluding the navbar) forms the backdrop which will then cause a very large blit to the backdrop root.
We could potentially compute the filtered backdrop using a readback which would no longer require rendering the backdrop in its own intermediate surface. This is very similar to how mix-blend-mode works. The tricky part is handling filters or filter chains that require multiple passes.
I haven't done any detailed performance profiling, but on pages with many backdrop-filter effects, it looks like we spend a lot of time in the brush_image shader which is presumably due to excess blitting.
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Updated•3 years ago
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Comment 1•2 years ago
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This is no longer an issue with the updated implementation.
Description
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