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Cumulate deltas even if they're out of the clip

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Otherwise, GM complexclip_aa_inverse will be drawn incorrectly
in t8888 mode.

Bug: skia:
Change-Id: I2fe9dd94f3219e3883f713ca95ea3c3d8a49c7ba
Reviewed-on: https://skia-review.googlesource.com/121261
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
This commit is contained in:
Yuqian Li 2018-04-13 12:08:01 -04:00 committed by Skia Commit-Bot
parent 3e4cbbb55d
commit 520e578b99
1 changed files with 9 additions and 3 deletions
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12
src/core/SkBlitter.cpp
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@ -129,9 +129,15 @@ void SkBlitter::blitCoverageDeltas(SkCoverageDeltaList* deltas, const SkIRect& c
int lastX = clip.fLeft; // init x to clip.fLeft
SkFixed coverage = 0; // init coverage to 0
// skip deltas with x less than clip.fLeft; they must be precision errors
for(; i < deltas->count(y) && deltas->getDelta(y, i).fX < clip.fLeft; ++i)
;
// skip deltas with x less than clip.fLeft; they may be:
// 1. precision errors
// 2. deltas generated during init-once phase (threaded backend) that has a wider
// clip than the final tile clip.
for(; i < deltas->count(y) && deltas->getDelta(y, i).fX < clip.fLeft; ++i) {
#ifndef SK_SUPPORT_LEGACY_THREADED_DAA_BUGS
coverage += deltas->getDelta(y, i).fDelta;
#endif
}
for(; i < deltas->count(y) && deltas->getDelta(y, i).fX < clip.fRight; ++i) {
const SkCoverageDelta& delta = deltas->getDelta(y, i);
SkASSERT(delta.fX >= lastX); // delta must be x sorted