1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "SkBoundaryPatch.h" 9 10 SK_DEFINE_INST_COUNT(SkBoundary) 11 12 SkBoundaryPatch::SkBoundaryPatch() : fBoundary(NULL) {} 13 14 SkBoundaryPatch::~SkBoundaryPatch() { 15 SkSafeUnref(fBoundary); 16 } 17 18 SkBoundary* SkBoundaryPatch::setBoundary(SkBoundary* b) { 19 SkRefCnt_SafeAssign(fBoundary, b); 20 return b; 21 } 22 23 static SkPoint SkMakePoint(SkScalar x, SkScalar y) { 24 SkPoint pt; 25 pt.set(x, y); 26 return pt; 27 } 28 29 static SkPoint SkPointInterp(const SkPoint& a, const SkPoint& b, SkScalar t) { 30 return SkMakePoint(SkScalarInterp(a.fX, b.fX, t), 31 SkScalarInterp(a.fY, b.fY, t)); 32 } 33 34 SkPoint SkBoundaryPatch::eval(SkScalar unitU, SkScalar unitV) { 35 SkBoundary* b = fBoundary; 36 SkPoint u = SkPointInterp(b->eval(SkBoundary::kLeft, SK_Scalar1 - unitV), 37 b->eval(SkBoundary::kRight, unitV), 38 unitU); 39 SkPoint v = SkPointInterp(b->eval(SkBoundary::kTop, unitU), 40 b->eval(SkBoundary::kBottom, SK_Scalar1 - unitU), 41 unitV); 42 return SkMakePoint(SkScalarAve(u.fX, v.fX), 43 SkScalarAve(u.fY, v.fY)); 44 } 45 46 bool SkBoundaryPatch::evalPatch(SkPoint verts[], int rows, int cols) { 47 if (rows < 2 || cols < 2) { 48 return false; 49 } 50 51 const SkScalar invR = SkScalarInvert(SkIntToScalar(rows - 1)); 52 const SkScalar invC = SkScalarInvert(SkIntToScalar(cols - 1)); 53 54 for (int y = 0; y < cols; y++) { 55 SkScalar yy = y * invC; 56 for (int x = 0; x < rows; x++) { 57 *verts++ = this->eval(x * invR, yy); 58 } 59 } 60 return true; 61 } 62 63 //////////////////////////////////////////////////////////////////////// 64 65 #include "SkGeometry.h" 66 67 SkPoint SkLineBoundary::eval(Edge e, SkScalar t) { 68 SkASSERT((unsigned)e < 4); 69 return SkPointInterp(fPts[e], fPts[(e + 1) & 3], t); 70 } 71 72 SkPoint SkCubicBoundary::eval(Edge e, SkScalar t) { 73 SkASSERT((unsigned)e < 4); 74 75 // ensure our 4th cubic wraps to the start of the first 76 fPts[12] = fPts[0]; 77 78 SkPoint loc; 79 SkEvalCubicAt(&fPts[e * 3], t, &loc, NULL, NULL); 80 return loc; 81 } 82
