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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_PATH_CACHE_H
#define ANDROID_HWUI_PATH_CACHE_H
#include <SkBitmap.h>
#include <SkPaint.h>
#include <SkPath.h>
#include <utils/Vector.h>
#include "Debug.h"
#include "Texture.h"
#include "utils/Compare.h"
#include "utils/GenerationCache.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////
// Debug
#if DEBUG_PATHS
#define PATH_LOGD(...) LOGD(__VA_ARGS__)
#else
#define PATH_LOGD(...)
#endif
///////////////////////////////////////////////////////////////////////////////
// Classes
///////////////////////////////////////////////////////////////////////////////
/**
* Describe a path in the path cache.
*/
struct PathCacheEntry {
PathCacheEntry() {
path = NULL;
join = SkPaint::kDefault_Join;
cap = SkPaint::kDefault_Cap;
style = SkPaint::kFill_Style;
miter = 4.0f;
strokeWidth = 1.0f;
}
PathCacheEntry(const PathCacheEntry& entry):
path(entry.path), join(entry.join), cap(entry.cap),
style(entry.style), miter(entry.miter),
strokeWidth(entry.strokeWidth) {
}
PathCacheEntry(SkPath* path, SkPaint* paint) {
this->path = path;
join = paint->getStrokeJoin();
cap = paint->getStrokeCap();
miter = paint->getStrokeMiter();
strokeWidth = paint->getStrokeWidth();
style = paint->getStyle();
}
SkPath* path;
SkPaint::Join join;
SkPaint::Cap cap;
SkPaint::Style style;
float miter;
float strokeWidth;
bool operator<(const PathCacheEntry& rhs) const {
LTE_INT(path) {
LTE_INT(join) {
LTE_INT(cap) {
LTE_INT(style) {
LTE_FLOAT(miter) {
LTE_FLOAT(strokeWidth) return false;
}
}
}
}
}
return false;
}
}; // struct PathCacheEntry
/**
* Alpha texture used to represent a path.
*/
struct PathTexture: public Texture {
PathTexture(): Texture() {
}
/**
* Left coordinate of the path bounds.
*/
float left;
/**
* Top coordinate of the path bounds.
*/
float top;
/**
* Offset to draw the path at the correct origin.
*/
float offset;
}; // struct PathTexture
/**
* A simple LRU path 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 PathCache: public OnEntryRemoved<PathCacheEntry, PathTexture*> {
public:
PathCache();
PathCache(uint32_t maxByteSize);
~PathCache();
/**
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
*/
void operator()(PathCacheEntry& path, PathTexture*& texture);
/**
* Returns the texture associated with the specified path. If the texture
* cannot be found in the cache, a new texture is generated.
*/
PathTexture* get(SkPath* path, SkPaint* paint);
/**
* Clears the cache. This causes all textures to be deleted.
*/
void clear();
/**
* Removes an entry.
*/
void remove(SkPath* path);
/**
* Removes the specified path. This is meant to be called from threads
* that are not the EGL context thread.
*/
void removeDeferred(SkPath* path);
/**
* Process deferred removals.
*/
void clearGarbage();
/**
* 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:
/**
* Generates the texture from a bitmap into the specified texture structure.
*/
void generateTexture(SkBitmap& bitmap, Texture* texture);
void removeTexture(PathTexture* texture);
PathTexture* addTexture(const PathCacheEntry& entry, const SkPath *path, const SkPaint* paint);
void init();
GenerationCache<PathCacheEntry, PathTexture*> mCache;
uint32_t mSize;
uint32_t mMaxSize;
GLuint mMaxTextureSize;
bool mDebugEnabled;
Vector<SkPath*> mGarbage;
mutable Mutex mLock;
}; // class PathCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_PATH_CACHE_H
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