[Impeller] use screen space coordinates for dithering. #51668
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I've confirmed locally the dithering is still working by creating a gradient with a single color and checking that the framebuffer values were slightly varied. (You can also still see the dithering pattern if you zoom in)
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…145788) flutter/engine@026d890...92ebd47 2024-03-26 jonahwilliams@google.com [Impeller] use screen space coordinates for dithering. (flutter/engine#51668) 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 jacksongardner@google.com,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
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Currently we're using the canvas coordinate positions for dithering. This usually works, but if the gradient includes a transform, then we might end up with 1 canvas coordinate pt = multiple physical pixels. This can result dithering artifacts since larger blocks will get the same color weight.
instead we can use gl_FragCoord.xy to get the screenspace coordinates which aren't effect by this transform.
Fixes flutter/flutter#145481
Before
After
Using the app from flutter/flutter#145481 but with the scaling factor increased to 10.0.