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{
  "commit": "87c021981231ec6f0b0acd2e0bd2c603835c05a0",
  "tree": "e6ab44c5ccba8fdd1cfcf333326ba55fe88f8525",
  "parents": [
    "5b9af9af95650a7905e1268f57a8c5eced3f79f5"
  ],
  "author": {
    "name": "Jackson Gardner",
    "email": "jacksongardner@google.com",
    "time": "Tue Sep 01 21:27:20 2026 +0000"
  },
  "committer": {
    "name": "GitHub",
    "email": "noreply@github.com",
    "time": "Tue Sep 01 21:27:20 2026 +0000"
  },
  "message": "[wimp] Turn on multithreading for wimp. (#191747)\n\nThis turns multithreaded wimp on. This fixes a few issues that popped up\nwhen diagnosing problems related to multithreading:\n* Instead of directly transferring `VideoFrame` objects to the web\nworker, make an `ImageBitmap` out of it. This normalizes the EXIF\nrotation of the image so that we don\u0027t end up with problems\ntransferrring it to a texture.\n* Use globals for the raster thread rather than function-local statics.\nEmscripten uses some complex locking schemes for function-local statics\nthat can sometimes cause compilcations and deadlocks, and they are\noverkill for what we\u0027re doing here. Using globals simplifies any locking\nschemes.\n* Pass the `ContentContext` when generating the impeller texture. This\nmakes sure that paths like the picture-to-image code path can share\nresources like the typographer context and cached runtime effects.\n* Because we\u0027re sharing the `ContentContext` when rendering pictures to\nimages now, we do a pre-pass that renders pictures to their image\nrepresentations before starting the rendering of the frame and puts them\nin the image cache. This avoids having nested render passes inside of a\nframe, which can cause problems for the state of the glyph atlas in the\n`ContentContext`",
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