[Pixman] [Patch] Gradient dithering into pixman (Try 2)

[Marc Jeanmougin]

Hi, I'm back :)


I tried to implement the proposed changes :

* the gradient walker now deals with argb_t (floats) and not uint32_t
* all gradients are WIDE because of the above change
* WIDE formats (using argb_t) can be dithered on write_back call
depending on the "dither" property of the image (set with
pixman_image_set_dither)
* The dithering is still random. I could try to implement other ones if
it's really needed for the patch to be accepted


Thanks for any feedback, please do tell if there are any more changes
needed for the patch to be accepted.

-- 
Marc
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