[whatwg] proposed canvas 2d API additions
sjoerd at w3future.com
Sat Apr 22 04:05:29 PDT 2006
Ian Hickson wrote:
> On Sat, 22 Apr 2006, Sjoerd Visscher wrote:
>>> I understand what you are proposing. What I don't understand is what
>>> colour should be returned when the many device pixels represented by
>>> the given coordinate space pixel have different colors.
>> The weighted average of the colors in the square the size of 1 by 1
>> canvas pixels.
> ...in fact, that won't work. It would mean that this, which should be a
> c.putPixels(c.getPixels(x, y, width, height), x, y, width, height);
> ...will end up down-sampling the bitmap, which seems like it would break
> the main use case for this API.
If this is the main use case, then putPixels is just drawImage, and
getPixels should be called copyCanvas, with the 4 arguments just setting
a clip region.
The main use case of calculating the color of a (pixel-)square whould be
the eye drop tool.
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