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"Fix" case when bicubic filtering warps premultiplied color

Browse Source 
https://codereview.appspot.com/7447048/



git-svn-id: http://skia.googlecode.com/svn/trunk@8096 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
robertphillips@google.com 2013-03-12 13:13:07 +00:00
parent 2d9dbd4f78
commit a041b954ff
1 changed files with 5 additions and 2 deletions
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7
src/effects/SkBicubicImageFilter.cpp
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@ -66,11 +66,14 @@ inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPM
cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3);
cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3);
cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3);
SkScalar a = SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3));
SkScalar a = SkScalarClampMax(SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3)), 255);
SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3));
SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3));
SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3));
return SkPackARGB32(SkScalarRoundToInt(SkScalarClampMax(a, 255)), SkScalarRoundToInt(SkScalarClampMax(r, 255)), SkScalarRoundToInt(SkScalarClampMax(g, 255)), SkScalarRoundToInt(SkScalarClampMax(b, 255)));
return SkPackARGB32(SkScalarRoundToInt(a),
SkScalarRoundToInt(SkScalarClampMax(r, a)),
SkScalarRoundToInt(SkScalarClampMax(g, a)),
SkScalarRoundToInt(SkScalarClampMax(b, a)));
}
bool SkBicubicImageFilter::onFilterImage(Proxy* proxy,