1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkTextMapStateProc_DEFINED 9 #define SkTextMapStateProc_DEFINED 10 11 #include "SkPoint.h" 12 #include "SkMatrix.h" 13 14 class SkTextMapStateProc { 15 public: 16 SkTextMapStateProc(const SkMatrix& matrix, SkScalar y, int scalarsPerPosition) 17 : fMatrix(matrix) 18 , fProc(matrix.getMapXYProc()) 19 , fY(y) 20 , fScaleX(fMatrix.getScaleX()) 21 , fTransX(fMatrix.getTranslateX()) { 22 SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); 23 if (1 == scalarsPerPosition) { 24 unsigned mtype = fMatrix.getType(); 25 if (mtype & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) { 26 fMapCase = kX; 27 } else { 28 fY = SkScalarMul(y, fMatrix.getScaleY()) + 29 fMatrix.getTranslateY(); 30 if (mtype & SkMatrix::kScale_Mask) { 31 fMapCase = kOnlyScaleX; 32 } else { 33 fMapCase = kOnlyTransX; 34 } 35 } 36 } else { 37 fMapCase = kXY; 38 } 39 } 40 41 void operator()(const SkScalar pos[], SkPoint* loc) const; 42 43 private: 44 const SkMatrix& fMatrix; 45 enum { 46 kXY, 47 kOnlyScaleX, 48 kOnlyTransX, 49 kX 50 } fMapCase; 51 const SkMatrix::MapXYProc fProc; 52 SkScalar fY; // Ignored by kXY case. 53 SkScalar fScaleX, fTransX; // These are only used by Only... cases. 54 }; 55 56 inline void SkTextMapStateProc::operator()(const SkScalar pos[], SkPoint* loc) const { 57 switch(fMapCase) { 58 case kXY: 59 fProc(fMatrix, pos[0], pos[1], loc); 60 break; 61 case kOnlyScaleX: 62 loc->set(SkScalarMul(fScaleX, *pos) + fTransX, fY); 63 break; 64 case kOnlyTransX: 65 loc->set(*pos + fTransX, fY); 66 break; 67 default: 68 SkASSERT(false); 69 case kX: 70 fProc(fMatrix, *pos, fY, loc); 71 break; 72 } 73 } 74 75 #endif 76 77
