NEW 218187
Web Inspector WebGL canvas debugger is reading uninitialised drawing buffers intentionally 
https://bugs.webkit.org/show_bug.cgi?id=218187
Summary Web Inspector WebGL canvas debugger is reading uninitialised drawing buffers ...
Kimmo Kinnunen
Reported 2020-10-26 06:44:51 PDT
Web Inspector WebGL canvas debugger is: * reading uninitialised drawing buffers intentionally * displaying at best 3 buffers old content (at worst, seee above) * is most likely corrupting the toDataURL / snapshot / printing cache bitmap The problem the inspector hack is trying to solve is: * need to capture snapshot of synchronously * need to capture drawing buffer if drawing buffer has been drawn to * need to capture display buffer if drawing buffer has not been draw to Fix by: * introducing a better function to read the canvas content * implement display buffer read * not pollute the HTMLCanvasElement "rendering results" image * implement cairo toDataURL or route data through ImageBuffer
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Kimmo Kinnunen
Comment 1 2020-10-26 06:45:55 PDT
See also bug 218186 where roughly similar problems have resulted in a different hack
Radar WebKit Bug Importer
Comment 2 2020-11-02 05:45:31 PST
<rdar://problem/70946992>
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