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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_GRADIENT_CACHE_H
#define ANDROID_HWUI_GRADIENT_CACHE_H
#include <GLES2/gl2.h>
#include <SkShader.h>
#include <utils/Mutex.h>
#include <utils/Vector.h>
#include "Texture.h"
#include "utils/Compare.h"
#include "utils/GenerationCache.h"
namespace android {
namespace uirenderer {
struct GradientCacheEntry {
GradientCacheEntry() {
count = 0;
colors = NULL;
positions = NULL;
}
GradientCacheEntry(uint32_t* colors, float* positions, int count) {
copy(colors, positions, count);
}
GradientCacheEntry(const GradientCacheEntry& entry) {
copy(entry.colors, entry.positions, entry.count);
}
~GradientCacheEntry() {
delete[] colors;
delete[] positions;
}
GradientCacheEntry& operator=(const GradientCacheEntry& entry) {
if (this != &entry) {
delete[] colors;
delete[] positions;
copy(entry.colors, entry.positions, entry.count);
}
return *this;
}
bool operator<(const GradientCacheEntry& r) const {
const GradientCacheEntry& rhs = (const GradientCacheEntry&) r;
LTE_INT(count) {
int result = memcmp(colors, rhs.colors, count * sizeof(uint32_t));
if (result< 0) return true;
else if (result == 0) {
result = memcmp(positions, rhs.positions, count * sizeof(float));
if (result < 0) return true;
}
}
return false;
}
uint32_t* colors;
float* positions;
int count;
SkShader::TileMode tileMode;
private:
void copy(uint32_t* colors, float* positions, int count) {
this->count = count;
this->colors = new uint32_t[count];
this->positions = new float[count];
memcpy(this->colors, colors, count * sizeof(uint32_t));
memcpy(this->positions, positions, count * sizeof(float));
}
}; // GradientCacheEntry
/**
* A simple LRU gradient cache. The cache has a maximum size expressed in bytes.
* Any texture added to the cache causing the cache to grow beyond the maximum
* allowed size will also cause the oldest texture to be kicked out.
*/
class GradientCache: public OnEntryRemoved<GradientCacheEntry, Texture*> {
public:
GradientCache();
GradientCache(uint32_t maxByteSize);
~GradientCache();
/**
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
*/
void operator()(GradientCacheEntry& shader, Texture*& texture);
/**
* Returns the texture associated with the specified shader.
*/
Texture* get(uint32_t* colors, float* positions, int count);
/**
* Clears the cache. This causes all textures to be deleted.
*/
void clear();
/**
* Sets the maximum size of the cache in bytes.
*/
void setMaxSize(uint32_t maxSize);
/**
* Returns the maximum size of the cache in bytes.
*/
uint32_t getMaxSize();
/**
* Returns the current size of the cache in bytes.
*/
uint32_t getSize();
private:
/**
* Adds a new linear gradient to the cache. The generated texture is
* returned.
*/
Texture* addLinearGradient(GradientCacheEntry& gradient,
uint32_t* colors, float* positions, int count);
void generateTexture(uint32_t* colors, float* positions, int count, Texture* texture);
struct GradientInfo {
uint32_t width;
bool hasAlpha;
};
void getGradientInfo(const uint32_t* colors, const int count, GradientInfo& info);
GenerationCache<GradientCacheEntry, Texture*> mCache;
uint32_t mSize;
uint32_t mMaxSize;
GLint mMaxTextureSize;
Vector<SkShader*> mGarbage;
mutable Mutex mLock;
}; // class GradientCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_GRADIENT_CACHE_H
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