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Relax the extra span's alpha

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BUG=chrome:662862
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2477393002

Review-Url: https://codereview.chromium.org/2477393002
This commit is contained in:
liyuqian 2016-11-08 13:55:15 -08:00 committed by Commit bot
parent f6bddfd33d
commit 1d3ab12b82
1 changed files with 8 additions and 4 deletions
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12
src/core/SkAAClip.cpp
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@ -1331,12 +1331,16 @@ public:
}
// The supersampler's buffer can be the width of the device, so
// we may have to trim the run to our bounds. If so, we assert that
// the extra spans are always alpha==0
// we may have to trim the run to our bounds. Previously, we assert that
// the extra spans are always alpha==0.
// However, the analytic AA is too sensitive to precision errors
// so it may have extra spans with very tiny alpha because after several
// arithmatic operations, the edge may bleed the path boundary a little bit.
// Therefore, instead of always asserting alpha==0, we assert alpha < 0x10.
int localX = x;
int localCount = count;
if (x < fLeft) {
SkASSERT(0 == *alpha);
SkASSERT(0x10 > *alpha);
int gap = fLeft - x;
SkASSERT(gap <= count);
localX += gap;
@ -1344,7 +1348,7 @@ public:
}
int right = x + count;
if (right > fRight) {
SkASSERT(0 == *alpha);
SkASSERT(0x10 > *alpha);
localCount -= right - fRight;
SkASSERT(localCount >= 0);
}