W3C home > Mailing lists > Public > whatwg@whatwg.org > April 2006

[whatwg] proposed canvas 2d API additions

From: Ian Hickson <ian@hixie.ch>
Date: Fri, 21 Apr 2006 23:18:17 +0000 (UTC)
Message-ID: <Pine.LNX.4.62.0604212316560.21459@dhalsim.dreamhost.com>
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 
no-op:

   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.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 21 April 2006 16:18:17 UTC

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