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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 <utils/Thread.h>
#include <utils/Vector.h>
#include "Debug.h"
#include "ShapeCache.h"
#include "thread/Signal.h"
class SkPaint;
class SkPath;
namespace android {
namespace uirenderer {
class Caches;
///////////////////////////////////////////////////////////////////////////////
// Classes
///////////////////////////////////////////////////////////////////////////////
struct PathCacheEntry: public ShapeCacheEntry {
PathCacheEntry(SkPath* path, SkPaint* paint):
ShapeCacheEntry(ShapeCacheEntry::kShapePath, paint) {
this->path = path;
}
PathCacheEntry(): ShapeCacheEntry() {
path = NULL;
}
hash_t hash() const {
uint32_t hash = ShapeCacheEntry::hash();
hash = JenkinsHashMix(hash, android::hash_type(path));
return JenkinsHashWhiten(hash);
}
int compare(const ShapeCacheEntry& r) const {
int deltaInt = ShapeCacheEntry::compare(r);
if (deltaInt != 0) return deltaInt;
const PathCacheEntry& rhs = (const PathCacheEntry&) r;
return path - rhs.path;
}
SkPath* path;
}; // PathCacheEntry
inline hash_t hash_type(const PathCacheEntry& entry) {
return entry.hash();
}
/**
* 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 ShapeCache<PathCacheEntry> {
public:
PathCache();
~PathCache();
/**
* 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);
/**
* 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();
void precache(SkPath* path, SkPaint* paint);
private:
class PrecacheThread: public Thread {
public:
PrecacheThread(): mSignal(Condition::WAKE_UP_ONE) { }
void addTask(PathTexture* texture, SkPath* path, SkPaint* paint);
void exit();
private:
struct Task {
PathTexture* texture;
SkPath* path;
SkPaint* paint;
};
virtual bool threadLoop();
// Lock for the list of tasks
Mutex mLock;
Vector<Task> mTasks;
// Signal used to wake up the thread when a new
// task is available in the list
mutable Signal mSignal;
};
sp<PrecacheThread> mThread;
Vector<SkPath*> mGarbage;
mutable Mutex mLock;
}; // class PathCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_PATH_CACHE_H
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