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[Impeller] Avoid unnecessary pre-pass when filtering images #35422
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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat (don't just cc him here, he won't see it! He's on Discord!). If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. |
chinmaygarde
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Aug 16, 2022
engine-flutter-autoroll
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Most of the time when filters are applied to textures (including layer textures), pre-rendering the texture is unnecessary. By just returning the texture in RenderToSnapshot with a proper matrix, a subpass is avoided. Filters can already handle arbitrary snapshot transforms and properly map UVs.
This change also adds a sampling configuration to snapshots, which allows filters more control over how the final blit should behave (will be needed for optimizing the Gaussian Blur).