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/*
* 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.
*/
#ifndef ANDROID_HWUI_GAMMA_FONT_RENDERER_H
#define ANDROID_HWUI_GAMMA_FONT_RENDERER_H
#include <SkPaint.h>
#include "FontRenderer.h"
#include "Program.h"
namespace android {
namespace uirenderer {
class GammaFontRenderer {
public:
virtual ~GammaFontRenderer();
virtual void clear() = 0;
virtual void flush() = 0;
virtual FontRenderer& getFontRenderer(const SkPaint* paint) = 0;
virtual uint32_t getFontRendererCount() const = 0;
virtual uint32_t getFontRendererSize(uint32_t fontRenderer) const = 0;
virtual void describe(ProgramDescription& description, const SkPaint* paint) const = 0;
virtual void setupProgram(ProgramDescription& description, Program* program) const = 0;
virtual void endPrecaching() = 0;
static GammaFontRenderer* createRenderer();
protected:
GammaFontRenderer();
int mBlackThreshold;
int mWhiteThreshold;
float mGamma;
};
class ShaderGammaFontRenderer: public GammaFontRenderer {
public:
~ShaderGammaFontRenderer() {
delete mRenderer;
}
void clear() {
delete mRenderer;
mRenderer = NULL;
}
void flush() {
if (mRenderer) {
mRenderer->flushLargeCaches();
}
}
FontRenderer& getFontRenderer(const SkPaint* paint) {
if (!mRenderer) {
mRenderer = new FontRenderer;
}
return *mRenderer;
}
uint32_t getFontRendererCount() const {
return 1;
}
uint32_t getFontRendererSize(uint32_t fontRenderer) const {
return mRenderer ? mRenderer->getCacheSize() : 0;
}
void describe(ProgramDescription& description, const SkPaint* paint) const;
void setupProgram(ProgramDescription& description, Program* program) const;
void endPrecaching();
private:
ShaderGammaFontRenderer(bool multiGamma);
FontRenderer* mRenderer;
bool mMultiGamma;
friend class GammaFontRenderer;
};
class LookupGammaFontRenderer: public GammaFontRenderer {
public:
~LookupGammaFontRenderer() {
delete mRenderer;
}
void clear() {
delete mRenderer;
mRenderer = NULL;
}
void flush() {
if (mRenderer) {
mRenderer->flushLargeCaches();
}
}
FontRenderer& getFontRenderer(const SkPaint* paint) {
if (!mRenderer) {
mRenderer = new FontRenderer;
mRenderer->setGammaTable(&mGammaTable[0]);
}
return *mRenderer;
}
uint32_t getFontRendererCount() const {
return 1;
}
uint32_t getFontRendererSize(uint32_t fontRenderer) const {
return mRenderer ? mRenderer->getCacheSize() : 0;
}
void describe(ProgramDescription& description, const SkPaint* paint) const {
}
void setupProgram(ProgramDescription& description, Program* program) const {
}
void endPrecaching();
private:
LookupGammaFontRenderer();
FontRenderer* mRenderer;
uint8_t mGammaTable[256];
friend class GammaFontRenderer;
};
class Lookup3GammaFontRenderer: public GammaFontRenderer {
public:
~Lookup3GammaFontRenderer();
void clear();
void flush();
FontRenderer& getFontRenderer(const SkPaint* paint);
uint32_t getFontRendererCount() const {
return kGammaCount;
}
uint32_t getFontRendererSize(uint32_t fontRenderer) const {
if (fontRenderer >= kGammaCount) return 0;
FontRenderer* renderer = mRenderers[fontRenderer];
if (!renderer) return 0;
return renderer->getCacheSize();
}
void describe(ProgramDescription& description, const SkPaint* paint) const {
}
void setupProgram(ProgramDescription& description, Program* program) const {
}
void endPrecaching();
private:
Lookup3GammaFontRenderer();
enum Gamma {
kGammaDefault = 0,
kGammaBlack = 1,
kGammaWhite = 2,
kGammaCount = 3
};
FontRenderer* getRenderer(Gamma gamma);
uint32_t mRenderersUsageCount[kGammaCount];
FontRenderer* mRenderers[kGammaCount];
uint8_t mGammaTable[256 * kGammaCount];
friend class GammaFontRenderer;
};
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_GAMMA_FONT_RENDERER_H
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