tree e2f472800cff801a1ddf334f64b9d79f3216a8b3
parent 2f83940c4db5d17dcb4fd7df24d8002022730a85
author vandebo@chromium.org <vandebo@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> 1306255145 +0000
committer vandebo@chromium.org <vandebo@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> 1306255145 +0000

[PDF] Add clip support and some optimizations for "complex" xfer modes.

For Clear, Src, Dst/Src-In/Out, we have to consider the current clip, and
potentially draw Dst, clipped to the inverse of the current clip before
doing the operation of interest.

For clear or src, if we haven't drawn anything, or the clip is empty, there's
nothing to be done.
For Src/Dst-In/Out, if either is empty, the result is empty.

Review URL: http://codereview.appspot.com/4538082

git-svn-id: http://skia.googlecode.com/svn/trunk@1407 2bbb7eff-a529-9590-31e7-b0007b416f81