[Webkit-unassigned] [Bug 17284] [CAIRO] Introduce single-pixel image optimizations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=17284


krit at webkit.org changed:

           What    |Removed                     |Added
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  Attachment #28192|0                           |1
        is obsolete|                            |
  Attachment #28221|                            |review?
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------- Comment #3 from krit at webkit.org  2009-03-03 08:30 PDT -------
Created an attachment (id=28221)
 --> (https://bugs.webkit.org/attachment.cgi?id=28221&action=view)
single pixel optimization with CairoColor

I talked to eseidel in IRC and he mentioned to add a new typedef or somthing
like that to avoid failured and make the code reading better.
I added a new color schema to Cairo: CairoColor. CairoColor attends to
premultiplying and every other calculation. I added some small callers to have
access to the color values of a pixel. You can easily get the unpremutiplied
colors of a pixel or set them by adding unpremultiplied colors.
We just support image surfaces with 32bit for now. There are asserts before
every direct manipulation of surfaces. But I don't see a problem to support
other surfaces in the future if wanted.


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