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Diffstat (limited to 'libs/hwui/GradientCache.h')
-rw-r--r-- | libs/hwui/GradientCache.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/libs/hwui/GradientCache.h b/libs/hwui/GradientCache.h new file mode 100644 index 0000000..12c8a23 --- /dev/null +++ b/libs/hwui/GradientCache.h @@ -0,0 +1,89 @@ +/* + * 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_UI_GRADIENT_CACHE_H +#define ANDROID_UI_GRADIENT_CACHE_H + +#include <SkShader.h> + +#include "Texture.h" +#include "GenerationCache.h" + +namespace android { +namespace uirenderer { + +/** + * 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<SkShader*, Texture*> { +public: + GradientCache(uint32_t maxByteSize); + ~GradientCache(); + + /** + * Used as a callback when an entry is removed from the cache. + * Do not invoke directly. + */ + void operator()(SkShader*& shader, Texture*& texture); + + /** + * Adds a new linear gradient to the cache. The generated texture is + * returned. + */ + Texture* addLinearGradient(SkShader* shader, float* bounds, uint32_t* colors, + float* positions, int count, SkShader::TileMode tileMode); + /** + * Returns the texture associated with the specified shader. + */ + Texture* get(SkShader* shader); + /** + * Removes the texture associated with the specified shader. Returns NULL + * if the texture cannot be found. Upon remove the texture is freed. + */ + void remove(SkShader* shader); + /** + * 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: + void generateTexture(SkBitmap* bitmap, Texture* texture); + + GenerationCache<SkShader*, Texture*> mCache; + + uint32_t mSize; + uint32_t mMaxSize; +}; // class GradientCache + +}; // namespace uirenderer +}; // namespace android + +#endif // ANDROID_UI_GRADIENT_CACHE_H |