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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "OpenGLRenderer"
#include "Debug.h"
#include "GammaFontRenderer.h"
#include "Properties.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Base class GammaFontRenderer
///////////////////////////////////////////////////////////////////////////////
GammaFontRenderer* GammaFontRenderer::createRenderer() {
// Choose the best renderer
char property[PROPERTY_VALUE_MAX];
if (property_get(PROPERTY_TEXT_GAMMA_SHADER, property, DEFAULT_TEXT_GAMMA_SHADER) > 0) {
if (!strcasecmp(property, "true")) {
return new ShaderGammaFontRenderer();
}
}
return new LookupGammaFontRenderer();
}
GammaFontRenderer::GammaFontRenderer() {
// Get the renderer properties
char property[PROPERTY_VALUE_MAX];
// Get the gamma
mGamma = DEFAULT_TEXT_GAMMA;
if (property_get(PROPERTY_TEXT_GAMMA, property, NULL) > 0) {
INIT_LOGD(" Setting text gamma to %s", property);
mGamma = atof(property);
} else {
INIT_LOGD(" Using default text gamma of %.2f", DEFAULT_TEXT_GAMMA);
}
// Get the black gamma threshold
mBlackThreshold = DEFAULT_TEXT_BLACK_GAMMA_THRESHOLD;
if (property_get(PROPERTY_TEXT_BLACK_GAMMA_THRESHOLD, property, NULL) > 0) {
INIT_LOGD(" Setting text black gamma threshold to %s", property);
mBlackThreshold = atoi(property);
} else {
INIT_LOGD(" Using default text black gamma threshold of %d",
DEFAULT_TEXT_BLACK_GAMMA_THRESHOLD);
}
// Get the white gamma threshold
mWhiteThreshold = DEFAULT_TEXT_WHITE_GAMMA_THRESHOLD;
if (property_get(PROPERTY_TEXT_WHITE_GAMMA_THRESHOLD, property, NULL) > 0) {
INIT_LOGD(" Setting text white gamma threshold to %s", property);
mWhiteThreshold = atoi(property);
} else {
INIT_LOGD(" Using default white black gamma threshold of %d",
DEFAULT_TEXT_WHITE_GAMMA_THRESHOLD);
}
}
GammaFontRenderer::~GammaFontRenderer() {
}
///////////////////////////////////////////////////////////////////////////////
// Shader-based renderer
///////////////////////////////////////////////////////////////////////////////
ShaderGammaFontRenderer::ShaderGammaFontRenderer(): GammaFontRenderer() {
INIT_LOGD("Creating shader gamma font renderer");
}
///////////////////////////////////////////////////////////////////////////////
// Lookup-based renderer
///////////////////////////////////////////////////////////////////////////////
LookupGammaFontRenderer::LookupGammaFontRenderer(): GammaFontRenderer() {
INIT_LOGD("Creating lookup gamma font renderer");
// Compute the gamma tables
const float blackGamma = mGamma;
const float whiteGamma = 1.0f / mGamma;
for (uint32_t i = 0; i <= 255; i++) {
mGammaTable[i] = i;
const float v = i / 255.0f;
const float black = pow(v, blackGamma);
const float white = pow(v, whiteGamma);
mGammaTable[256 + i] = uint8_t((float)::floor(black * 255.0f + 0.5f));
mGammaTable[512 + i] = uint8_t((float)::floor(white * 255.0f + 0.5f));
}
memset(mRenderers, 0, sizeof(FontRenderer*) * kGammaCount);
memset(mRenderersUsageCount, 0, sizeof(uint32_t) * kGammaCount);
}
LookupGammaFontRenderer::~LookupGammaFontRenderer() {
for (int i = 0; i < kGammaCount; i++) {
delete mRenderers[i];
}
}
void LookupGammaFontRenderer::clear() {
for (int i = 0; i < kGammaCount; i++) {
delete mRenderers[i];
mRenderers[i] = NULL;
}
}
void LookupGammaFontRenderer::flush() {
int count = 0;
int min = -1;
uint32_t minCount = UINT_MAX;
for (int i = 0; i < kGammaCount; i++) {
if (mRenderers[i]) {
count++;
if (mRenderersUsageCount[i] < minCount) {
minCount = mRenderersUsageCount[i];
min = i;
}
}
}
if (count <= 1 || min < 0) return;
delete mRenderers[min];
mRenderers[min] = NULL;
// Also eliminate the caches for large glyphs, as they consume significant memory
for (int i = 0; i < kGammaCount; ++i) {
if (mRenderers[i]) {
mRenderers[i]->flushLargeCaches();
}
}
}
FontRenderer* LookupGammaFontRenderer::getRenderer(Gamma gamma) {
FontRenderer* renderer = mRenderers[gamma];
if (!renderer) {
renderer = new FontRenderer();
mRenderers[gamma] = renderer;
renderer->setGammaTable(&mGammaTable[gamma * 256]);
}
mRenderersUsageCount[gamma]++;
return renderer;
}
FontRenderer& LookupGammaFontRenderer::getFontRenderer(const SkPaint* paint) {
if (paint->getShader() == NULL) {
uint32_t c = paint->getColor();
const int r = (c >> 16) & 0xFF;
const int g = (c >> 8) & 0xFF;
const int b = (c ) & 0xFF;
const int luminance = (r * 2 + g * 5 + b) >> 3;
if (luminance <= mBlackThreshold) {
return *getRenderer(kGammaBlack);
} else if (luminance >= mWhiteThreshold) {
return *getRenderer(kGammaWhite);
}
}
return *getRenderer(kGammaDefault);
}
}; // namespace uirenderer
}; // namespace android
|