GammaFontRenderer.h revision 0aa87bbfc41e8b5f52de701ac17b4e66a7a7b609 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_HWUI_GAMMA_FONT_RENDERER_H
18#define ANDROID_HWUI_GAMMA_FONT_RENDERER_H
19
20#include <SkPaint.h>
21
22#include "FontRenderer.h"
23#include "Program.h"
24
25namespace android {
26namespace uirenderer {
27
28class GammaFontRenderer {
29public:
30    virtual ~GammaFontRenderer();
31
32    virtual void clear() = 0;
33    virtual void flush() = 0;
34
35    virtual FontRenderer& getFontRenderer(const SkPaint* paint) = 0;
36
37    virtual uint32_t getFontRendererCount() const = 0;
38    virtual uint32_t getFontRendererSize(uint32_t fontRenderer) const = 0;
39
40    virtual void describe(ProgramDescription& description, const SkPaint* paint) const = 0;
41    virtual void setupProgram(ProgramDescription& description, Program* program) const = 0;
42
43    static GammaFontRenderer* createRenderer();
44
45protected:
46    GammaFontRenderer();
47
48    int mBlackThreshold;
49    int mWhiteThreshold;
50
51    float mGamma;
52};
53
54class ShaderGammaFontRenderer: public GammaFontRenderer {
55public:
56    ~ShaderGammaFontRenderer() {
57        delete mRenderer;
58    }
59
60    void clear() {
61        delete mRenderer;
62        mRenderer = NULL;
63    }
64
65    void flush() {
66        if (mRenderer) {
67            mRenderer->flushLargeCaches();
68        }
69    }
70
71    FontRenderer& getFontRenderer(const SkPaint* paint) {
72        if (!mRenderer) {
73            mRenderer = new FontRenderer;
74        }
75        return *mRenderer;
76    }
77
78    uint32_t getFontRendererCount() const {
79        return 1;
80    }
81
82    uint32_t getFontRendererSize(uint32_t fontRenderer) const {
83        return mRenderer ? mRenderer->getCacheSize() : 0;
84    }
85
86    void describe(ProgramDescription& description, const SkPaint* paint) const;
87    void setupProgram(ProgramDescription& description, Program* program) const;
88
89private:
90    ShaderGammaFontRenderer(bool multiGamma);
91
92    FontRenderer* mRenderer;
93    bool mMultiGamma;
94
95    friend class GammaFontRenderer;
96};
97
98class LookupGammaFontRenderer: public GammaFontRenderer {
99public:
100    ~LookupGammaFontRenderer() {
101        delete mRenderer;
102    }
103
104    void clear() {
105        delete mRenderer;
106    }
107
108    void flush() {
109        if (mRenderer) {
110            mRenderer->flushLargeCaches();
111        }
112    }
113
114    FontRenderer& getFontRenderer(const SkPaint* paint) {
115        if (!mRenderer) {
116            mRenderer = new FontRenderer;
117            mRenderer->setGammaTable(&mGammaTable[0]);
118        }
119        return *mRenderer;
120    }
121
122    uint32_t getFontRendererCount() const {
123        return 1;
124    }
125
126    uint32_t getFontRendererSize(uint32_t fontRenderer) const {
127        return mRenderer ? mRenderer->getCacheSize() : 0;
128    }
129
130    void describe(ProgramDescription& description, const SkPaint* paint) const {
131    }
132
133    void setupProgram(ProgramDescription& description, Program* program) const {
134    }
135
136private:
137    LookupGammaFontRenderer();
138
139    FontRenderer* mRenderer;
140    uint8_t mGammaTable[256];
141
142    friend class GammaFontRenderer;
143};
144
145class Lookup3GammaFontRenderer: public GammaFontRenderer {
146public:
147    ~Lookup3GammaFontRenderer();
148
149    void clear();
150    void flush();
151
152    FontRenderer& getFontRenderer(const SkPaint* paint);
153
154    uint32_t getFontRendererCount() const {
155        return kGammaCount;
156    }
157
158    uint32_t getFontRendererSize(uint32_t fontRenderer) const {
159        if (fontRenderer >= kGammaCount) return 0;
160
161        FontRenderer* renderer = mRenderers[fontRenderer];
162        if (!renderer) return 0;
163
164        return renderer->getCacheSize();
165    }
166
167    void describe(ProgramDescription& description, const SkPaint* paint) const {
168    }
169
170    void setupProgram(ProgramDescription& description, Program* program) const {
171    }
172
173private:
174    Lookup3GammaFontRenderer();
175
176    enum Gamma {
177        kGammaDefault = 0,
178        kGammaBlack = 1,
179        kGammaWhite = 2,
180        kGammaCount = 3
181    };
182
183    FontRenderer* getRenderer(Gamma gamma);
184
185    uint32_t mRenderersUsageCount[kGammaCount];
186    FontRenderer* mRenderers[kGammaCount];
187
188    uint8_t mGammaTable[256 * kGammaCount];
189
190    friend class GammaFontRenderer;
191};
192
193}; // namespace uirenderer
194}; // namespace android
195
196#endif // ANDROID_HWUI_GAMMA_FONT_RENDERER_H
197