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:
SkTextMapStateProc(const SkMatrix & matrix,SkScalar y,int scalarsPerPosition)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
operator()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