[whatwg] several messages
ian at hixie.ch
Wed Jun 3 12:51:06 PDT 2009
On Tue, 7 Apr 2009, Jeff Creamer wrote:
> Hi. Since March of '06, Opera 9 has supported a custom extension to the
> canvas context called "opera-2dgame." Importantly, their extension adds
> these methods:
> getPixel(x, y)
> Returns the pixel value (colour, opacity) at (x, y). Returned in the
> form #rrggbb if fully opaque and rgba(r, g, b, a) if it has some alpha
> setPixel (x, y, color)
> Allows you to set the colour of the pixel at (x, y). The third argument
> should be a CSS color - you could provide a string such as `red', a HTML
> colour code or even a rgba() value.
> I don't see any recent discussion of this. And I am also aware that the
> canvas drawing model is not pixel-oriented. Nonetheless, mightn't these
> functions be extremely useful? As the Opera folk point out, they bless
> game developers, and it occurs to me that they could be used for other
> Description including several demo programs and a discussion of security
> issues is available here.
> Why not make getPixel () and setPixel() a standard?
On Tue, 7 Apr 2009, Oliver Hunt wrote:
> The ImageData APIs already provide the ability to do this and are
> already supported by Firefox, Opera and Safari.
Given the ImageData APIs, and given that they are generally more efficient
at the typical use cases for getPixel/setPixel, I haven't added getPixel/
setPixel to the spec.
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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