diff options
| author |  mike@reedtribe.org <mike@reedtribe.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-04-14 02:40:50 +0000 |
|---|---|---|
| committer | mike@reedtribe.org <mike@reedtribe.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-04-14 02:40:50 +0000 |
| commit | 8d551011966a1bc14a654dbde704f343c0e222b6 (patch) | |
| tree | 6b673139aae31e58f9e3b3df80c543809f1163e9 /src | |
| parent | 4af6280aa366a02540f34c48f89ea73ce3d27974 (diff) | |
add special-case for chopping at exactly half for rational-quads (2-3x faster)
git-svn-id: http://skia.googlecode.com/svn/trunk@8672 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/SkGeometry.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/core/SkGeometry.cpp b/src/core/SkGeometry.cpp index 511c34e1aa..a440d039de 100644 --- a/src/core/SkGeometry.cpp +++ b/src/core/SkGeometry.cpp @@ -1464,3 +1464,24 @@ void SkRationalQuad::chopAt(SkScalar t, SkRationalQuad dst[2]) const { dst[0].fW = tmp2[0].fZ / root; dst[1].fW = tmp2[2].fZ / root; } + +void SkRationalQuad::chop(SkRationalQuad dst[2]) const { + SkScalar scale = SkScalarInvert(SK_Scalar1 + fW); + SkScalar p1x = fW * fPts[1].fX; + SkScalar p1y = fW * fPts[1].fY; + SkScalar mx = (fPts[0].fX + 2 * p1x + fPts[2].fX) * scale * SK_ScalarHalf; + SkScalar my = (fPts[0].fY + 2 * p1y + fPts[2].fY) * scale * SK_ScalarHalf; + + dst[0].fPts[0] = fPts[0]; + dst[0].fPts[1].set((fPts[0].fX + p1x) * scale, + (fPts[0].fY + p1y) * scale); + dst[0].fPts[2].set(mx, my); + + dst[1].fPts[0].set(mx, my); + dst[1].fPts[1].set((p1x + fPts[2].fX) * scale, + (p1y + fPts[2].fY) * scale); + dst[1].fPts[2] = fPts[2]; + + dst[0].fW = dst[1].fW = SkScalarSqrt((1 + fW) * SK_ScalarHalf); +} + |