shape ops work in progress
git-svn-id: http://skia.googlecode.com/svn/trunk@7836 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/Intersection/CubicSubDivide.cpp b/experimental/Intersection/CubicSubDivide.cpp
index b7cc127..ee7057b 100644
--- a/experimental/Intersection/CubicSubDivide.cpp
+++ b/experimental/Intersection/CubicSubDivide.cpp
@@ -83,6 +83,22 @@
/* cy = */ dst[2].y = (ny * 2 - my) / 18;
}
+void sub_divide(const Cubic& src, const _Point& a, const _Point& d,
+ double t1, double t2, _Point dst[2]) {
+ double ex = interp_cubic_coords(&src[0].x, (t1 * 2 + t2) / 3);
+ double ey = interp_cubic_coords(&src[0].y, (t1 * 2 + t2) / 3);
+ double fx = interp_cubic_coords(&src[0].x, (t1 + t2 * 2) / 3);
+ double fy = interp_cubic_coords(&src[0].y, (t1 + t2 * 2) / 3);
+ double mx = ex * 27 - a.x * 8 - d.x;
+ double my = ey * 27 - a.y * 8 - d.y;
+ double nx = fx * 27 - a.x - d.x * 8;
+ double ny = fy * 27 - a.y - d.y * 8;
+ /* bx = */ dst[0].x = (mx * 2 - nx) / 18;
+ /* by = */ dst[0].y = (my * 2 - ny) / 18;
+ /* cx = */ dst[1].x = (nx * 2 - mx) / 18;
+ /* cy = */ dst[1].y = (ny * 2 - my) / 18;
+}
+
/* classic one t subdivision */
static void interp_cubic_coords(const double* src, double* dst, double t)
{