// Uses the max curvature function for quads to estimate
// where to chop the conic. If the max curvature is not
// found along the curve segment it will return 1 and
// dst[0] is the original conic. If it returns 2 the dst[0]
// and dst[1] are the two new conics.
static int split_conic(const SkPoint src[3], SkConic dst[2], const SkScalar weight) {
SkScalar t = SkFindQuadMaxCurvature(src);
if (t == 0) {
if (dst) {
dst[0].set(src, weight);
}
return 1;
} else {
if (dst) {
SkConic conic;
conic.set(src, weight);
conic.chopAt(t, dst);
}
return 2;
}
}
static void chopBothWays(const SkDConic& dConic, double t, const char* name) {
SkConic conic;
for (int index = 0; index < 3; ++index) {
conic.fPts[index] = dConic.fPts[index].asSkPoint();
}
conic.fW = dConic.fWeight;
SkConic chopped[2];
SkDConic dChopped[2];
conic.chopAt(SkDoubleToScalar(t), chopped);
dChopped[0] = dConic.subDivide(0, t);
dChopped[1] = dConic.subDivide(t, 1);
#if DEBUG_VISUALIZE_CONICS
dConic.dump();
#endif
chopCompare(chopped, dChopped);
#if DEBUG_VISUALIZE_CONICS
writePng(conic, chopped, name);
#endif
}
static void test_conic_eval_tan(skiatest::Reporter* reporter, const SkConic& conic, SkScalar t) {
SkVector v0, v1;
conic.evalAt(t, nullptr, &v0);
v1 = conic.evalTangentAt(t);
check_pairs(reporter, 0, t, "conic-tan", v0.fX, v0.fY, v1.fX, v1.fY);
}
static void test_conic_eval_pos(skiatest::Reporter* reporter, const SkConic& conic, SkScalar t) {
SkPoint p0, p1;
conic.evalAt(t, &p0, nullptr);
p1 = conic.evalAt(t);
check_pairs(reporter, 0, t, "conic-pos", p0.fX, p0.fY, p1.fX, p1.fY);
}