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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_SKIA_COLOR_FILTER_H
#define ANDROID_HWUI_SKIA_COLOR_FILTER_H
#include <GLES2/gl2.h>
#include <SkColorFilter.h>
#include "ProgramCache.h"
#include "Extensions.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Base color filter
///////////////////////////////////////////////////////////////////////////////
/**
* Represents a Skia color filter. A color filter modifies a ProgramDescription
* and sets uniforms on the resulting shaders.
*/
struct SkiaColorFilter {
/**
* Type of Skia color filter in use.
*/
enum Type {
kNone,
kColorMatrix,
kLighting,
kBlend,
};
SkiaColorFilter(SkColorFilter *skFilter, Type type, bool blend);
virtual ~SkiaColorFilter();
virtual void describe(ProgramDescription& description, const Extensions& extensions) = 0;
virtual void setupProgram(Program* program) = 0;
inline bool blend() const {
return mBlend;
}
Type type() const {
return mType;
}
SkColorFilter *getSkColorFilter() {
return mSkFilter;
}
protected:
Type mType;
bool mBlend;
private:
SkColorFilter *mSkFilter;
}; // struct SkiaColorFilter
///////////////////////////////////////////////////////////////////////////////
// Implementations
///////////////////////////////////////////////////////////////////////////////
/**
* A color filter that multiplies the source color with a matrix and adds a vector.
*/
struct SkiaColorMatrixFilter: public SkiaColorFilter {
SkiaColorMatrixFilter(SkColorFilter *skFilter, float* matrix, float* vector);
~SkiaColorMatrixFilter();
void describe(ProgramDescription& description, const Extensions& extensions);
void setupProgram(Program* program);
private:
float* mMatrix;
float* mVector;
}; // struct SkiaColorMatrixFilter
/**
* A color filters that multiplies the source color with a fixed value and adds
* another fixed value. Ignores the alpha channel of both arguments.
*/
struct SkiaLightingFilter: public SkiaColorFilter {
SkiaLightingFilter(SkColorFilter *skFilter, int multiply, int add);
void describe(ProgramDescription& description, const Extensions& extensions);
void setupProgram(Program* program);
private:
GLfloat mMulR, mMulG, mMulB;
GLfloat mAddR, mAddG, mAddB;
}; // struct SkiaLightingFilter
/**
* A color filters that blends the source color with a specified destination color
* and PorterDuff blending mode.
*/
struct SkiaBlendFilter: public SkiaColorFilter {
SkiaBlendFilter(SkColorFilter *skFilter, int color, SkXfermode::Mode mode);
void describe(ProgramDescription& description, const Extensions& extensions);
void setupProgram(Program* program);
private:
SkXfermode::Mode mMode;
GLfloat mR, mG, mB, mA;
}; // struct SkiaBlendFilter
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_SKIA_COLOR_FILTER_H
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