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revert match for newAlpha to exactly match old math, so we don't drive

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dumprendertree crazy



git-svn-id: http://skia.googlecode.com/svn/trunk@2287 2bbb7eff-a529-9590-31e7-b0007b416f81
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reed@google.com 2011-09-19 21:21:45 +00:00
parent 5672838761
commit 6a87fafc5c
1 changed files with 8 additions and 0 deletions
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8
src/core/SkDraw.cpp
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@ -862,7 +862,15 @@ bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix,
SkScalar len1 = fast_len(dst[1]); SkScalar len1 = fast_len(dst[1]);
if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) { if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) {
SkScalar modulate = SkScalarAve(len0, len1); SkScalar modulate = SkScalarAve(len0, len1);
#if 0
*newAlpha = SkToU8(SkScalarRoundToInt(modulate * paint.getAlpha())); *newAlpha = SkToU8(SkScalarRoundToInt(modulate * paint.getAlpha()));
#else
// this is the old technique, which we preserve for now so we don't
// change previous results (testing)
// the new way seems fine, its just (a tiny bit) different
int scale = (int)SkScalarMul(modulate, 256);
*newAlpha = paint.getAlpha() * scale >> 8;
#endif
return true; return true;
} }
return false; return false;