162 lines
4.1 KiB
C++
162 lines
4.1 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_UI_PATH_CACHE_H
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#define ANDROID_UI_PATH_CACHE_H
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#include <SkBitmap.h>
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#include <SkPaint.h>
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#include <SkPath.h>
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#include "Texture.h"
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#include "GenerationCache.h"
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namespace android {
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namespace uirenderer {
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/**
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* Describe a path in the path cache.
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*/
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struct PathCacheEntry {
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PathCacheEntry() {
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path = NULL;
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join = SkPaint::kDefault_Join;
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cap = SkPaint::kDefault_Cap;
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style = SkPaint::kFill_Style;
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miter = 4.0f;
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strokeWidth = 1.0f;
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}
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PathCacheEntry(const PathCacheEntry& entry):
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path(entry.path), join(entry.join), cap(entry.cap),
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style(entry.style), miter(entry.miter),
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strokeWidth(entry.strokeWidth) {
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}
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PathCacheEntry(SkPath* path, SkPaint* paint) {
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this->path = path;
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join = paint->getStrokeJoin();
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cap = paint->getStrokeCap();
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miter = paint->getStrokeMiter();
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strokeWidth = paint->getStrokeWidth();
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style = paint->getStyle();
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}
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SkPath* path;
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SkPaint::Join join;
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SkPaint::Cap cap;
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SkPaint::Style style;
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float miter;
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float strokeWidth;
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bool operator<(const PathCacheEntry& rhs) const {
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return memcmp(this, &rhs, sizeof(PathCacheEntry)) < 0;
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}
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}; // struct PathCacheEntry
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/**
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* Alpha texture used to represent a path.
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*/
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struct PathTexture: public Texture {
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PathTexture(): Texture() {
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}
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/**
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* Left coordinate of the path bounds.
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*/
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float left;
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/**
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* Top coordinate of the path bounds.
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*/
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float top;
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/**
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* Offset to draw the path at the correct origin.
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*/
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float offset;
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}; // struct PathTexture
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/**
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* A simple LRU path cache. The cache has a maximum size expressed in bytes.
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* Any texture added to the cache causing the cache to grow beyond the maximum
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* allowed size will also cause the oldest texture to be kicked out.
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*/
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class PathCache: public OnEntryRemoved<PathCacheEntry, PathTexture*> {
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public:
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PathCache();
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PathCache(uint32_t maxByteSize);
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~PathCache();
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/**
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* Used as a callback when an entry is removed from the cache.
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* Do not invoke directly.
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*/
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void operator()(PathCacheEntry& path, PathTexture*& texture);
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/**
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* Returns the texture associated with the specified path. If the texture
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* cannot be found in the cache, a new texture is generated.
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*/
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PathTexture* get(SkPath* path, SkPaint* paint);
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/**
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* Clears the cache. This causes all textures to be deleted.
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*/
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void clear();
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/**
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* Removes an entry.
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*/
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void remove(SkPath* path);
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/**
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* Sets the maximum size of the cache in bytes.
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*/
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void setMaxSize(uint32_t maxSize);
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/**
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* Returns the maximum size of the cache in bytes.
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*/
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uint32_t getMaxSize();
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/**
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* Returns the current size of the cache in bytes.
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*/
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uint32_t getSize();
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private:
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/**
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* Generates the texture from a bitmap into the specified texture structure.
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*/
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void generateTexture(SkBitmap& bitmap, Texture* texture);
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PathTexture* addTexture(const PathCacheEntry& entry, const SkPath *path, const SkPaint* paint);
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void init();
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GenerationCache<PathCacheEntry, PathTexture*> mCache;
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uint32_t mSize;
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uint32_t mMaxSize;
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GLuint mMaxTextureSize;
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/**
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* Used to access mCache and mSize. All methods are accessed from a single
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* thread except for remove().
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*/
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mutable Mutex mLock;
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}; // class PathCache
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_UI_PATH_CACHE_H
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