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Reading a canvas back doubles its memory: numbers from three engines

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getImageData on the full canvas. For a long time our memory estimate for a large image was "width × height × 4". That number is right for the canvas itself, and it is exactly half of what the component actually holds once it reads the pixels back. The numbers below come from a round of measurements on an Apple M4 with 16 GB, using three engine builds: the Chromium 149 open-source build, a WebKit 26.5 build and a Firefox 151 build. None of them is the browser you download, so read nothing here as Chrome, Safari or release Firefox behavior.

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