1 #include "SkBoundaryPatch.h"
2
SkBoundaryPatch()3 SkBoundaryPatch::SkBoundaryPatch() : fBoundary(NULL) {}
4
~SkBoundaryPatch()5 SkBoundaryPatch::~SkBoundaryPatch() {
6 SkSafeUnref(fBoundary);
7 }
8
setBoundary(SkBoundary * b)9 SkBoundary* SkBoundaryPatch::setBoundary(SkBoundary* b) {
10 SkRefCnt_SafeAssign(fBoundary, b);
11 return b;
12 }
13
SkMakePoint(SkScalar x,SkScalar y)14 static SkPoint SkMakePoint(SkScalar x, SkScalar y) {
15 SkPoint pt;
16 pt.set(x, y);
17 return pt;
18 }
19
SkPointInterp(const SkPoint & a,const SkPoint & b,SkScalar t)20 static SkPoint SkPointInterp(const SkPoint& a, const SkPoint& b, SkScalar t) {
21 return SkMakePoint(SkScalarInterp(a.fX, b.fX, t),
22 SkScalarInterp(a.fY, b.fY, t));
23 }
24
eval(SkScalar unitU,SkScalar unitV)25 SkPoint SkBoundaryPatch::eval(SkScalar unitU, SkScalar unitV) {
26 SkBoundary* b = fBoundary;
27 SkPoint u = SkPointInterp(b->eval(SkBoundary::kLeft, SK_Scalar1 - unitV),
28 b->eval(SkBoundary::kRight, unitV),
29 unitU);
30 SkPoint v = SkPointInterp(b->eval(SkBoundary::kTop, unitU),
31 b->eval(SkBoundary::kBottom, SK_Scalar1 - unitU),
32 unitV);
33 return SkMakePoint(SkScalarAve(u.fX, v.fX),
34 SkScalarAve(u.fY, v.fY));
35 }
36
evalPatch(SkPoint verts[],int rows,int cols)37 bool SkBoundaryPatch::evalPatch(SkPoint verts[], int rows, int cols) {
38 if (rows < 2 || cols < 2) {
39 return false;
40 }
41
42 const SkScalar invR = SkScalarInvert(SkIntToScalar(rows - 1));
43 const SkScalar invC = SkScalarInvert(SkIntToScalar(cols - 1));
44
45 for (int y = 0; y < cols; y++) {
46 SkScalar yy = y * invC;
47 for (int x = 0; x < rows; x++) {
48 *verts++ = this->eval(x * invR, yy);
49 }
50 }
51 return true;
52 }
53
54 ////////////////////////////////////////////////////////////////////////
55
56 #include "SkGeometry.h"
57
eval(Edge e,SkScalar t)58 SkPoint SkLineBoundary::eval(Edge e, SkScalar t) {
59 SkASSERT((unsigned)e < 4);
60 return SkPointInterp(fPts[e], fPts[(e + 1) & 3], t);
61 }
62
eval(Edge e,SkScalar t)63 SkPoint SkCubicBoundary::eval(Edge e, SkScalar t) {
64 SkASSERT((unsigned)e < 4);
65
66 // ensure our 4th cubic wraps to the start of the first
67 fPts[12] = fPts[0];
68
69 SkPoint loc;
70 SkEvalCubicAt(&fPts[e * 3], t, &loc, NULL, NULL);
71 return loc;
72 }
73
74