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 "SkMatrixPriv.h"
13
14 class SkTextMapStateProc {
15 public:
SkTextMapStateProc(const SkMatrix & matrix,const SkPoint & offset,int scalarsPerPosition)16 SkTextMapStateProc(const SkMatrix& matrix, const SkPoint& offset, int scalarsPerPosition)
17 : fMatrix(matrix)
18 , fProc(SkMatrixPriv::GetMapXYProc(matrix))
19 , fOffset(offset)
20 , fScaleX(fMatrix.getScaleX()) {
21 SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
22 if (1 == scalarsPerPosition) {
23 unsigned mtype = fMatrix.getType();
24 if (mtype & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
25 fMapCase = kX;
26 } else {
27 // Bake the matrix scale/translation components into fOffset,
28 // to expedite proc computations.
29 fOffset.set(offset.x() * fMatrix.getScaleX() + fMatrix.getTranslateX(),
30 offset.y() * fMatrix.getScaleY() + fMatrix.getTranslateY());
31
32 if (mtype & SkMatrix::kScale_Mask) {
33 fMapCase = kOnlyScaleX;
34 } else {
35 fMapCase = kOnlyTransX;
36 }
37 }
38 } else {
39 fMapCase = kXY;
40 }
41 }
42
43 void operator()(const SkScalar pos[], SkPoint* loc) const;
44
45 private:
46 const SkMatrix& fMatrix;
47 enum {
48 kXY,
49 kOnlyScaleX,
50 kOnlyTransX,
51 kX
52 } fMapCase;
53 const SkMatrixPriv::MapXYProc fProc;
54 SkPoint fOffset; // In kOnly* mode, this includes the matrix translation component.
55 SkScalar fScaleX; // This is only used by kOnly... cases.
56 };
57
operator()58 inline void SkTextMapStateProc::operator()(const SkScalar pos[], SkPoint* loc) const {
59 switch(fMapCase) {
60 case kXY:
61 fProc(fMatrix, pos[0] + fOffset.x(), pos[1] + fOffset.y(), loc);
62 break;
63 case kOnlyScaleX:
64 loc->set(fScaleX * *pos + fOffset.x(), fOffset.y());
65 break;
66 case kOnlyTransX:
67 loc->set(*pos + fOffset.x(), fOffset.y());
68 break;
69 default:
70 SkASSERT(false);
71 case kX:
72 fProc(fMatrix, *pos + fOffset.x(), fOffset.y(), loc);
73 break;
74 }
75 }
76
77 #endif
78