218187 2020-10-26 06:44:51 -0700 Web Inspector WebGL canvas debugger is reading uninitialised drawing buffers intentionally 2020-11-02 05:45:31 -0800 1 1 1 Unclassified WebKit Web Inspector WebKit Local Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=218186 InRadar P2 Normal --- 1 kkinnunen webkit-unassigned inspector-bugzilla-changes webkit-bug-importer oldest_to_newest 1701437 0 kkinnunen 2020-10-26 06:44:51 -0700 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 1701439 1 kkinnunen 2020-10-26 06:45:55 -0700 See also bug 218186 where roughly similar problems have resulted in a different hack 1703500 2 webkit-bug-importer 2020-11-02 05:45:31 -0800 <rdar://problem/70946992>