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compute new weight in standard-form

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git-svn-id: http://skia.googlecode.com/svn/trunk@8671 2bbb7eff-a529-9590-31e7-b0007b416f81
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mike@reedtribe.org 2013-04-13 10:51:51 +00:00
parent 4bb50b22fc
commit 4af6280aa3
1 changed files with 10 additions and 2 deletions
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12
src/core/SkGeometry.cpp
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@ -1453,6 +1453,14 @@ void SkRationalQuad::chopAt(SkScalar t, SkRationalQuad dst[2]) const {
tmp2[2].projectDown(&dst[1].fPts[1]);
dst[1].fPts[2] = fPts[2];
dst[0].fW = tmp2[0].fZ; // ?????
dst[1].fW = tmp2[2].fZ; // ?????
// to put in "standard form", where w0 and w2 are both 1, we compute the
// new w1 as sqrt(w1*w1/w0*w2)
// or
// w1 /= sqrt(w0*w2)
//
// However, in our case, we know that for dst[0], w0 == 1, and for dst[1], w2 == 1
//
SkScalar root = SkScalarSqrt(tmp2[1].fZ);
dst[0].fW = tmp2[0].fZ / root;
dst[1].fW = tmp2[2].fZ / root;
}