1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorMatrix.h"
void SkColorMatrix::setIdentity() {
memset(fMat, 0, sizeof(fMat));
fMat[kR_Scale] = fMat[kG_Scale] = fMat[kB_Scale] = fMat[kA_Scale] = 1;
}
void SkColorMatrix::setScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
SkScalar aScale) {
memset(fMat, 0, sizeof(fMat));
fMat[kR_Scale] = rScale;
fMat[kG_Scale] = gScale;
fMat[kB_Scale] = bScale;
fMat[kA_Scale] = aScale;
}
void SkColorMatrix::postTranslate(SkScalar dr, SkScalar dg, SkScalar db,
SkScalar da) {
fMat[kR_Trans] += dr;
fMat[kG_Trans] += dg;
fMat[kB_Trans] += db;
fMat[kA_Trans] += da;
}
///////////////////////////////////////////////////////////////////////////////
void SkColorMatrix::setRotate(Axis axis, SkScalar degrees) {
SkScalar S, C;
S = SkScalarSinCos(SkDegreesToRadians(degrees), &C);
this->setSinCos(axis, S, C);
}
void SkColorMatrix::setSinCos(Axis axis, SkScalar sine, SkScalar cosine) {
SkASSERT((unsigned)axis < 3);
static const uint8_t gRotateIndex[] = {
6, 7, 11, 12,
0, 10, 2, 12,
0, 1, 5, 6,
};
const uint8_t* index = gRotateIndex + axis * 4;
this->setIdentity();
fMat[index[0]] = cosine;
fMat[index[1]] = sine;
fMat[index[2]] = -sine;
fMat[index[3]] = cosine;
}
void SkColorMatrix::preRotate(Axis axis, SkScalar degrees) {
SkColorMatrix tmp;
tmp.setRotate(axis, degrees);
this->preConcat(tmp);
}
void SkColorMatrix::postRotate(Axis axis, SkScalar degrees) {
SkColorMatrix tmp;
tmp.setRotate(axis, degrees);
this->postConcat(tmp);
}
///////////////////////////////////////////////////////////////////////////////
void SkColorMatrix::setConcat(const SkColorMatrix& matA,
const SkColorMatrix& matB) {
SkScalar tmp[20];
SkScalar* result = fMat;
if (&matA == this || &matB == this) {
result = tmp;
}
const SkScalar* a = matA.fMat;
const SkScalar* b = matB.fMat;
int index = 0;
for (int j = 0; j < 20; j += 5) {
for (int i = 0; i < 4; i++) {
result[index++] = SkScalarMul(a[j + 0], b[i + 0]) +
SkScalarMul(a[j + 1], b[i + 5]) +
SkScalarMul(a[j + 2], b[i + 10]) +
SkScalarMul(a[j + 3], b[i + 15]);
}
result[index++] = SkScalarMul(a[j + 0], b[4]) +
SkScalarMul(a[j + 1], b[9]) +
SkScalarMul(a[j + 2], b[14]) +
SkScalarMul(a[j + 3], b[19]) +
a[j + 4];
}
if (fMat != result) {
memcpy(fMat, result, sizeof(fMat));
}
}
///////////////////////////////////////////////////////////////////////////////
static void setrow(SkScalar row[], SkScalar r, SkScalar g, SkScalar b) {
row[0] = r;
row[1] = g;
row[2] = b;
}
static const SkScalar kHueR = 0.213f;
static const SkScalar kHueG = 0.715f;
static const SkScalar kHueB = 0.072f;
void SkColorMatrix::setSaturation(SkScalar sat) {
memset(fMat, 0, sizeof(fMat));
const SkScalar R = kHueR * (1 - sat);
const SkScalar G = kHueG * (1 - sat);
const SkScalar B = kHueB * (1 - sat);
setrow(fMat + 0, R + sat, G, B);
setrow(fMat + 5, R, G + sat, B);
setrow(fMat + 10, R, G, B + sat);
fMat[kA_Scale] = 1;
}
static const SkScalar kR2Y = 0.299f;
static const SkScalar kG2Y = 0.587f;
static const SkScalar kB2Y = 0.114f;
static const SkScalar kR2U = -0.16874f;
static const SkScalar kG2U = -0.33126f;
static const SkScalar kB2U = 0.5f;
static const SkScalar kR2V = 0.5f;
static const SkScalar kG2V = -0.41869f;
static const SkScalar kB2V = -0.08131f;
void SkColorMatrix::setRGB2YUV() {
memset(fMat, 0, sizeof(fMat));
setrow(fMat + 0, kR2Y, kG2Y, kB2Y);
setrow(fMat + 5, kR2U, kG2U, kB2U);
setrow(fMat + 10, kR2V, kG2V, kB2V);
fMat[kA_Scale] = 1;
}
static const SkScalar kV2R = 1.402f;
static const SkScalar kU2G = -0.34414f;
static const SkScalar kV2G = -0.71414f;
static const SkScalar kU2B = 1.772f;
void SkColorMatrix::setYUV2RGB() {
memset(fMat, 0, sizeof(fMat));
setrow(fMat + 0, 1, 0, kV2R);
setrow(fMat + 5, 1, kU2G, kV2G);
setrow(fMat + 10, 1, kU2B, 0);
fMat[kA_Scale] = 1;
}
|
