b1d0a4ed21
This change is the first step to a shader-based text antialias gamma correction. Change-Id: I9eb02d4c56cb95d05219f712290c865b46141954
136 lines
3.0 KiB
C++
136 lines
3.0 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_HWUI_GAMMA_FONT_RENDERER_H
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#define ANDROID_HWUI_GAMMA_FONT_RENDERER_H
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#include <SkPaint.h>
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#include "FontRenderer.h"
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namespace android {
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namespace uirenderer {
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class GammaFontRenderer {
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public:
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virtual ~GammaFontRenderer();
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virtual void clear() = 0;
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virtual void flush() = 0;
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virtual FontRenderer& getFontRenderer(const SkPaint* paint) = 0;
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virtual uint32_t getFontRendererCount() const = 0;
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virtual uint32_t getFontRendererSize(uint32_t fontRenderer) const = 0;
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static GammaFontRenderer* createRenderer();
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protected:
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GammaFontRenderer();
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int mBlackThreshold;
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int mWhiteThreshold;
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float mGamma;
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};
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class ShaderGammaFontRenderer: public GammaFontRenderer {
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public:
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~ShaderGammaFontRenderer() {
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delete mRenderer;
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}
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void clear() {
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delete mRenderer;
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}
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void flush() {
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if (mRenderer) {
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mRenderer->flushLargeCaches();
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}
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}
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FontRenderer& getFontRenderer(const SkPaint* paint) {
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if (!mRenderer) {
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mRenderer = new FontRenderer;
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}
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return *mRenderer;
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}
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uint32_t getFontRendererCount() const {
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return 1;
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}
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uint32_t getFontRendererSize(uint32_t fontRenderer) const {
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return mRenderer->getCacheSize();
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}
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private:
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ShaderGammaFontRenderer();
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FontRenderer* mRenderer;
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friend class GammaFontRenderer;
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};
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class LookupGammaFontRenderer: public GammaFontRenderer {
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public:
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~LookupGammaFontRenderer();
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void clear();
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void flush();
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FontRenderer& getFontRenderer(const SkPaint* paint);
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uint32_t getFontRendererCount() const {
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return kGammaCount;
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}
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uint32_t getFontRendererSize(uint32_t fontRenderer) const {
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if (fontRenderer >= kGammaCount) return 0;
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FontRenderer* renderer = mRenderers[fontRenderer];
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if (!renderer) return 0;
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return renderer->getCacheSize();
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}
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private:
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LookupGammaFontRenderer();
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enum Gamma {
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kGammaDefault = 0,
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kGammaBlack = 1,
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kGammaWhite = 2,
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kGammaCount = 3
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};
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FontRenderer* getRenderer(Gamma gamma);
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uint32_t mRenderersUsageCount[kGammaCount];
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FontRenderer* mRenderers[kGammaCount];
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uint8_t mGammaTable[256 * kGammaCount];
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friend class GammaFontRenderer;
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};
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_GAMMA_FONT_RENDERER_H
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