[cairo] Dithering

[Keith Packard]

On Tue, 2008-04-01 at 03:54 +0400, Behdad Esfahbod wrote:

> The hard part about dithering in cairo is that compositing requires to
> read back the drawable contents, compose to it, and put it back.  So if
> one's not careful, the dithering adjustment can accumulate and show very
> bad effect.  I "fix" that by subtracting the dithering adjustment when
> getting the image from the server.  Seems to work fine.

What i'd like to see is to have the xlib backend just keep a 32-bit
image on the client side and never fetch bits back from the server, that
way the dithering would be done only on put-image.

As a side-effect, drawing without Render would become a lot faster too.

-- 
keith.packard at intel.com
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