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Simplify k.w calculation in getConicKLM.

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Additionally reformat the equations to better expose the symmetry.

BUG=skia:

Change-Id: If485cc7aeae97b89dedeb4d6b23efbe945036e3a
Reviewed-on: https://skia-review.googlesource.com/7000
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Dean McNamee <deanm@chromium.org>
Commit-Queue: Greg Daniel <egdaniel@google.com>
This commit is contained in:
Dean McNamee 2017-01-13 12:17:09 +00:00 committed by Skia Commit-Bot
parent 930f69eef3
commit 3b830a9ea3
1 changed files with 4 additions and 4 deletions
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8
src/gpu/GrPathUtils.cpp
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@ -320,14 +320,14 @@ void GrPathUtils::QuadUVMatrix::set(const SkPoint qPts[3]) {
////////////////////////////////////////////////////////////////////////////////
// k = (y2 - y0, x0 - x2, (x2 - x0)*y0 - (y2 - y0)*x0 )
// l = (2*w * (y1 - y0), 2*w * (x0 - x1), 2*w * (x1*y0 - x0*y1))
// m = (2*w * (y2 - y1), 2*w * (x1 - x2), 2*w * (x2*y1 - x1*y2))
// k = (y2 - y0, x0 - x2, x2*y0 - x0*y2)
// l = (y1 - y0, x0 - x1, x1*y0 - x0*y1) * 2*w
// m = (y2 - y1, x1 - x2, x2*y1 - x1*y2) * 2*w
void GrPathUtils::getConicKLM(const SkPoint p[3], const SkScalar weight, SkScalar klm[9]) {
const SkScalar w2 = 2.f * weight;
klm[0] = p[2].fY - p[0].fY;
klm[1] = p[0].fX - p[2].fX;
klm[2] = (p[2].fX - p[0].fX) * p[0].fY - (p[2].fY - p[0].fY) * p[0].fX;
klm[2] = p[2].fX * p[0].fY - p[0].fX * p[2].fY;
klm[3] = w2 * (p[1].fY - p[0].fY);
klm[4] = w2 * (p[0].fX - p[1].fX);