GammaFontRenderer.h revision 4121063313ac0d6f69f6253cac821d0c1c122086 
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    }
63
64    void flush() {
65        if (mRenderer) {
66            mRenderer->flushLargeCaches();
67        }
68    }
69
70    FontRenderer& getFontRenderer(const SkPaint* paint) {
71        if (!mRenderer) {
72            mRenderer = new FontRenderer;
73        }
74        return *mRenderer;
75    }
76
77    uint32_t getFontRendererCount() const {
78        return 1;
79    }
80
81    uint32_t getFontRendererSize(uint32_t fontRenderer) const {
82        return mRenderer->getCacheSize();
83    }
84
85    void describe(ProgramDescription& description, const SkPaint* paint) const;
86    void setupProgram(ProgramDescription& description, Program* program) const;
87
88private:
89    ShaderGammaFontRenderer();
90
91    FontRenderer* mRenderer;
92
93    friend class GammaFontRenderer;
94};
95
96class LookupGammaFontRenderer: public GammaFontRenderer {
97public:
98    ~LookupGammaFontRenderer();
99
100    void clear();
101    void flush();
102
103    FontRenderer& getFontRenderer(const SkPaint* paint);
104
105    uint32_t getFontRendererCount() const {
106        return kGammaCount;
107    }
108
109    uint32_t getFontRendererSize(uint32_t fontRenderer) const {
110        if (fontRenderer >= kGammaCount) return 0;
111
112        FontRenderer* renderer = mRenderers[fontRenderer];
113        if (!renderer) return 0;
114
115        return renderer->getCacheSize();
116    }
117
118    void describe(ProgramDescription& description, const SkPaint* paint) const {
119    }
120
121    void setupProgram(ProgramDescription& description, Program* program) const {
122    }
123
124private:
125    LookupGammaFontRenderer();
126
127    enum Gamma {
128        kGammaDefault = 0,
129        kGammaBlack = 1,
130        kGammaWhite = 2,
131        kGammaCount = 3
132    };
133
134    FontRenderer* getRenderer(Gamma gamma);
135
136    uint32_t mRenderersUsageCount[kGammaCount];
137    FontRenderer* mRenderers[kGammaCount];
138
139    uint8_t mGammaTable[256 * kGammaCount];
140
141    friend class GammaFontRenderer;
142};
143
144}; // namespace uirenderer
145}; // namespace android
146
147#endif // ANDROID_HWUI_GAMMA_FONT_RENDERER_H
148