[Bug 15041] Clarify dimensions of image returned by Canvas toDataURL

https://www.w3.org/Bugs/Public/show_bug.cgi?id=15041

--- Comment #2 from Simon Fraser <smfr@me.com> 2011-12-02 19:15:50 UTC ---
(In reply to comment #1)

> toDataURL should be producing an image identical to what's displayed in the
> canvas.  If it produces an image with one image pixel = one backing store
> pixel, then it won't roundtrip through canvas, which your spec quote implies
> should happen.
> 
> toDataURL, thus, should use screen pixels, not backing store pixels.

These two statements are not logically consistent. If the canvas has 2x backing
store, but toDataURL uses screen pixels, then the toDataURL image will look
fuzzy compared to the canvas on a 2x display.

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Received on Friday, 2 December 2011 19:15:54 UTC