GammaFontRenderer.h revision eca0ca2424afc1e98912405906edfc32f7733e16 
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
24namespace android {
25namespace uirenderer {
26
27struct GammaFontRenderer {
28    GammaFontRenderer();
29    ~GammaFontRenderer();
30
31    enum Gamma {
32        kGammaDefault = 0,
33        kGammaBlack = 1,
34        kGammaWhite = 2,
35        kGammaCount = 3
36    };
37
38    void clear();
39    void flush();
40
41    FontRenderer& getFontRenderer(const SkPaint* paint);
42
43    uint32_t getFontRendererCount() const {
44        return kGammaCount;
45    }
46
47    uint32_t getFontRendererSize(uint32_t fontRenderer) const {
48        if (fontRenderer >= kGammaCount) return 0;
49
50        FontRenderer* renderer = mRenderers[fontRenderer];
51        if (!renderer) return 0;
52
53        return renderer->getCacheHeight() * renderer->getCacheWidth();
54    }
55
56private:
57    FontRenderer* getRenderer(Gamma gamma);
58
59    uint32_t mRenderersUsageCount[kGammaCount];
60    FontRenderer* mRenderers[kGammaCount];
61
62    int mBlackThreshold;
63    int mWhiteThreshold;
64
65    uint8_t mGammaTable[256 * kGammaCount];
66};
67
68}; // namespace uirenderer
69}; // namespace android
70
71#endif // ANDROID_HWUI_GAMMA_FONT_RENDERER_H
72