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
|
/*
* 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 {
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
GammaFontRenderer::GammaFontRenderer() {
INIT_LOGD("Creating gamma font renderer");
// Get the renderer properties
char property[PROPERTY_VALUE_MAX];
// Get the gamma
float gamma = DEFAULT_TEXT_GAMMA;
if (property_get(PROPERTY_TEXT_GAMMA, property, NULL) > 0) {
INIT_LOGD(" Setting text gamma to %s", property);
gamma = 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);
}
// Compute the gamma tables
const float blackGamma = gamma;
const float whiteGamma = 1.0f / gamma;
for (uint32_t i = 0; i <= 255; i++) {
mDefault[i] = i;
const float v = i / 255.0f;
const float black = pow(v, blackGamma);
const float white = pow(v, whiteGamma);
mBlackGamma[i] = uint8_t((float)::floor(black * 255.0f + 0.5f));
mWhiteGamma[i] = uint8_t((float)::floor(white * 255.0f + 0.5f));
}
// Configure the font renderers
mDefaultRenderer.setGammaTable(&mDefault[0]);
mBlackGammaRenderer.setGammaTable(&mBlackGamma[0]);
mWhiteGammaRenderer.setGammaTable(&mWhiteGamma[0]);
}
FontRenderer& GammaFontRenderer::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 mBlackGammaRenderer;
} else if (luminance >= mWhiteThreshold) {
return mWhiteGammaRenderer;
}
}
return mDefaultRenderer;
}
}; // namespace uirenderer
}; // namespace android
|
