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[skwasm] Fixes for getting pixels from an image. #53561
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There were two issues here: 1) We have to stop using the emscripten thread scheduling APIs, as they can be invoked out of order from the rest of the messages that are posted. In some cases, out of order message handling can cause the request for reading pixels in an image to be serviced before some of the texture sources have been transfered to the web worker. 2) Skia's `readPixels` fails if there is is a lazy picture image made from a picture that contains a lazy texture image. The pertinent bug is here: https://g-issues.skia.org/issues/349201915 To work around the Skia bug, we just render the image itself onto our scratch canvas and pull the pixels out with `glReadPixels`. This fixes flutter/flutter#141326
yjbanov
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Jun 25, 2024
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The semantics here actually changed as part of this PR. dispose used to be called on the main thread, and then that dispatched to the web worker which called _dispose. Now there's just one method, dispose and that does what _dispose used to do.
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…150797) flutter/engine@62e0b5f...94023d7 2024-06-25 [email protected] [skwasm] Fixes for getting pixels from an image. (flutter/engine#53561) 2024-06-25 [email protected] fix: web canvaskit fragment shaders were not using updated uniform values (flutter/engine#53246) 2024-06-25 [email protected] Roll Dart SDK from b5fc85cfcf1b to 65ab2f2cf0d3 (1 revision) (flutter/engine#53565) 2024-06-25 [email protected] Roll Skia from e4e4feb97a54 to da1ea4eb0270 (4 revisions) (flutter/engine#53563) 2024-06-25 [email protected] [DisplayList] Switch to recording DrawVertices objects by reference (flutter/engine#53548) 2024-06-25 [email protected] Roll Skia from 5f21260470cf to e4e4feb97a54 (1 revision) (flutter/engine#53559) 2024-06-25 [email protected] [impeller] Cleanup blur (flutter/engine#53543) 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 [email protected],[email protected],[email protected] 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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There were two issues here:
We have to stop using the emscripten thread scheduling APIs, as they can be invoked out of order from the rest of the messages that are posted. In some cases, out of order message handling can cause the request for reading pixels in an image to be serviced before some of the texture sources have been transfered to the web worker.
Skia's
readPixelsfails if there is is a lazy picture image made from a picture that contains a lazy texture image. The pertinent bug is here: https://g-issues.skia.org/issues/349201915To work around the Skia bug, we just render the image itself onto our scratch canvas and pull the pixels out with
glReadPixels.This fixes flutter/flutter#141326