SkColorMatrix.h revision 31b3044af4e97c662076147d119ba233a163b769 
1/*
2 * Copyright 2007 The Android Open Source Project
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 SkColorMatrix_DEFINED
9#define SkColorMatrix_DEFINED
10
11#include "SkScalar.h"
12
13class SK_API SkColorMatrix {
14public:
15    SkScalar    fMat[20];
16
17    enum Elem {
18        kR_Scale    = 0,
19        kG_Scale    = 6,
20        kB_Scale    = 12,
21        kA_Scale    = 18,
22
23        kR_Trans    = 4,
24        kG_Trans    = 9,
25        kB_Trans    = 14,
26        kA_Trans    = 19,
27    };
28
29    void setIdentity();
30    void setScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
31                  SkScalar aScale = SK_Scalar1);
32    void preScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
33                  SkScalar aScale = SK_Scalar1);
34    void postScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
35                   SkScalar aScale = SK_Scalar1);
36    void postTranslate(SkScalar rTrans, SkScalar gTrans, SkScalar bTrans,
37                       SkScalar aTrans = 0);
38
39    enum Axis {
40        kR_Axis = 0,
41        kG_Axis = 1,
42        kB_Axis = 2
43    };
44    void setRotate(Axis, SkScalar degrees);
45    void setSinCos(Axis, SkScalar sine, SkScalar cosine);
46    void preRotate(Axis, SkScalar degrees);
47    void postRotate(Axis, SkScalar degrees);
48
49    void setConcat(const SkColorMatrix& a, const SkColorMatrix& b);
50    void preConcat(const SkColorMatrix& mat) { this->setConcat(*this, mat); }
51    void postConcat(const SkColorMatrix& mat) { this->setConcat(mat, *this); }
52
53    void setSaturation(SkScalar sat);
54    void setRGB2YUV();
55    void setYUV2RGB();
56
57    bool operator==(const SkColorMatrix& other) const {
58        return 0 == memcmp(fMat, other.fMat, sizeof(fMat));
59    }
60
61    bool operator!=(const SkColorMatrix& other) const { return !((*this) == other); }
62};
63
64#endif
65