[Impeller] Add mask blur style support to the RRect blur fast path. #51250
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The SDF implementation suggested here might lend itself to an even more direct implementation if we could teach it to implement unequal corner radii. Since it computes the distance to the interior and knows if it is inside or outside, a lot of variants could be developed from it just by doing some clamping based on the sign of the SDF computation. |
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LGTM! The only thing we should do is make the test results easier to talk about and evaluate. There is like 30 images all on one image. These should be separate tests or labeled in the output. People should be able to easily talk about the results and correlate the output with the code, this makes that too difficult.
impeller/aiks/canvas.cc
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| rrect_paint.color = | ||
| rrect_paint.GetColorFilter()->GetCPUColorFilterProc()(paint.color); | ||
| rrect_paint.color_filter = nullptr; | ||
| rrect_paint.invert_colors = false; |
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nit: This seems tricky, having to clear out invert_colors. I could see someone missing this easily, it might be worth making a function AbsorbColorFilter
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This should be turned around. Rather than clone and eliminate properties, create a default paint and only copy in the attributes you want.
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I fixed this up to try and make the paint construction less confusing. Please TAL.
impeller/aiks/aiks_unittests.cc
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| BlendMode blend_mode = BlendMode::kSourceOver; | ||
| }; | ||
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| static Picture MaskBlurVariantTest(const AiksTest& test_context, |
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Oh wait, can you put these in aiks_blur_unittests, please? I wish I had a better way to force the sorting of this.
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…144817) flutter/engine@bbb1ed0...bc4abcd 2024-03-08 bdero@google.com [Impeller] Add mask blur style support to the RRect blur fast path. (flutter/engine#51250) 2024-03-08 30870216+gaaclarke@users.noreply.github.com [Impeller] moved tests to aiks_blur_unittests, added warning (flutter/engine#51274) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC rmistry@google.com,zra@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
This improves performance by avoiding the 2-pass Gaussian blur in more shadow drawing situations.
The new golden also serves as a good reference for how mask blurs are supposed to work alongside various other paint properties such as color filters, color opacity, image filters, and blending.
The top 5 shapes are various RRect cases and are rendering correctly via the new blur style implementation in this patch.
The two bottom rows (the triangles and arcs) are non-rrect paths, so they're falling back to rendering using the 2-pass Gaussian blur. Rendering errors are circled in red below:
BlurStyle::kSolid. After the first clipped overlay has been drawn, subsequent clipped overlays aren't drawing.BlendMode::kExclusion.BlurStyle::kInnerandBlurStyle::kOuterrespectfully, but with a blur ImageFilter also set on the paint state. The ImageFilter needs to be applied to the rasterized mask blurred content.