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Unified Diff: src/core/SkGeometry.cpp

Issue 1084283003: Speeup hairline curves (quads and cubics) (patchset #7 id:120001 of https://codereview.chromium.org… (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 8 months ago
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Index: src/core/SkGeometry.cpp
diff --git a/src/core/SkGeometry.cpp b/src/core/SkGeometry.cpp
index 50af22de37d1acc968676bd581f90fe9cf5696b5..59796154252dac1f7494591f281fa9da02b3a5a4 100644
--- a/src/core/SkGeometry.cpp
+++ b/src/core/SkGeometry.cpp
@@ -9,6 +9,7 @@
#include "SkMatrix.h"
#include "SkNx.h"
+#if 0
static Sk2s from_point(const SkPoint& point) {
return Sk2s::Load(&point.fX);
}
@@ -18,6 +19,7 @@ static SkPoint to_point(const Sk2s& x) {
x.store(&point.fX);
return point;
}
+#endif
static SkVector to_vector(const Sk2s& x) {
SkVector vector;
@@ -135,6 +137,18 @@ static SkScalar eval_quad_derivative(const SkScalar src[], SkScalar t) {
return 2 * SkScalarMulAdd(A, t, B);
}
+void SkQuadToCoeff(const SkPoint pts[3], SkPoint coeff[3]) {
+ Sk2s p0 = from_point(pts[0]);
+ Sk2s p1 = from_point(pts[1]);
+ Sk2s p2 = from_point(pts[2]);
+
+ Sk2s p1minus2 = p1 - p0;
+
+ coeff[0] = to_point(p2 - p1 - p1 + p0); // A * t^2
+ coeff[1] = to_point(p1minus2 + p1minus2); // B * t
+ coeff[2] = pts[0]; // C
+}
+
void SkEvalQuadAt(const SkPoint src[3], SkScalar t, SkPoint* pt, SkVector* tangent) {
SkASSERT(src);
SkASSERT(t >= 0 && t <= SK_Scalar1);
@@ -452,6 +466,26 @@ void SkChopCubicAt(const SkPoint src[4], SkPoint dst[7], SkScalar t) {
dst[6] = src[3];
}
+void SkCubicToCoeff(const SkPoint pts[4], SkPoint coeff[4]) {
+ Sk2s p0 = from_point(pts[0]);
+ Sk2s p1 = from_point(pts[1]);
+ Sk2s p2 = from_point(pts[2]);
+ Sk2s p3 = from_point(pts[3]);
+
+ const Sk2s three(3);
+ Sk2s p1minusp2 = p1 - p2;
+
+ Sk2s D = p0;
+ Sk2s A = p3 + three * p1minusp2 - D;
+ Sk2s B = three * (D - p1minusp2 - p1);
+ Sk2s C = three * (p1 - D);
+
+ coeff[0] = to_point(A);
+ coeff[1] = to_point(B);
+ coeff[2] = to_point(C);
+ coeff[3] = to_point(D);
+}
+
/* http://code.google.com/p/skia/issues/detail?id=32
This test code would fail when we didn't check the return result of
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