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/**
* @file lltexturecache.h
* @brief Object for managing texture cachees.
*
* Copyright (c) 2000-2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
*/
#ifndef LL_LLTEXTURECACHE_
#define LL_LLTEXTURECACHE_H
#include "lldir.h"
#include "llstl.h"
#include "llstring.h"
#include "lluuid.h"
#include "llworkerthread.h"
class LLTextureCacheWorker;
class LLTextureCache : public LLWorkerThread
{
friend class LLTextureCacheWorker;
public:
class Responder : public LLResponder
{
public:
virtual void setData(U8* data, S32 datasize, S32 imagesize, S32 imageformat, BOOL imagelocal) = 0;
};
class ReadResponder : public Responder
{
public:
ReadResponder();
void setData(U8* data, S32 datasize, S32 imagesize, S32 imageformat, BOOL imagelocal);
void setImage(LLImageFormatted* image) { mFormattedImage = image; }
protected:
LLPointer<LLImageFormatted> mFormattedImage;
S32 mImageSize;
BOOL mImageLocal;
};
class WriteResponder : public Responder
{
void setData(U8* data, S32 datasize, S32 imagesize, S32 imageformat, BOOL imagelocal)
{
// not used
}
};
LLTextureCache(bool threaded);
~LLTextureCache();
/*virtual*/ S32 update(U32 max_time_ms);
void purgeCache(ELLPath location);
S64 initCache(ELLPath location, S64 maxsize, BOOL read_only);
handle_t readFromCache(const LLUUID& id, U32 priority, S32 offset, S32 size,
ReadResponder* responder);
bool readComplete(handle_t handle, bool abort);
handle_t writeToCache(const LLUUID& id, U32 priority, U8* data, S32 datasize, S32 imagesize,
WriteResponder* responder);
bool writeComplete(handle_t handle, bool abort = false);
void prioritizeWrite(handle_t handle);
void removeFromCache(const LLUUID& id);
// For LLTextureCacheWorker::Responder
LLTextureCacheWorker* getReader(handle_t handle);
LLTextureCacheWorker* getWriter(handle_t handle);
void lockWorkers() { mWorkersMutex.lock(); }
void unlockWorkers() { mWorkersMutex.unlock(); }
// debug
S32 getNumReads() { return mReaders.size(); }
S32 getNumWrites() { return mWriters.size(); }
protected:
// Accessed by LLTextureCacheWorker
apr_pool_t* getFileAPRPool() { return mFileAPRPool; }
bool appendToTextureEntryList(const LLUUID& id, S32 size);
std::string getLocalFileName(const LLUUID& id);
std::string getTextureFileName(const LLUUID& id);
void addCompleted(Responder* responder, bool success);
private:
void setDirNames(ELLPath location);
void readHeaderCache(apr_pool_t* poolp = NULL);
void purgeAllTextures(bool purge_directories);
void purgeTextures(bool validate);
S32 getHeaderCacheEntry(const LLUUID& id, bool touch, S32* imagesize = NULL);
bool removeHeaderCacheEntry(const LLUUID& id);
void lockHeaders() { mHeaderMutex.lock(); }
void unlockHeaders() { mHeaderMutex.unlock(); }
private:
// Internal
LLMutex mWorkersMutex;
LLMutex mHeaderMutex;
LLMutex mListMutex;
apr_pool_t* mFileAPRPool;
typedef std::map<handle_t, LLTextureCacheWorker*> handle_map_t;
handle_map_t mReaders;
handle_map_t mWriters;
typedef std::vector<handle_t> handle_list_t;
handle_list_t mPrioritizeWriteList;
typedef std::vector<std::pair<LLPointer<Responder>, bool> > responder_list_t;
responder_list_t mCompletedList;
BOOL mReadOnly;
// Entries
struct EntriesInfo
{
F32 mVersion;
U32 mEntries;
};
struct Entry
{
Entry() {}
Entry(const LLUUID& id, S32 size, U32 time) : mID(id), mSize(size), mTime(time) {}
LLUUID mID; // 128 bits
S32 mSize; // total size of image if known (NOT size cached)
U32 mTime; // seconds since 1/1/1970
};
// HEADERS (Include first mip)
std::string mHeaderEntriesFileName;
std::string mHeaderDataFileName;
EntriesInfo mHeaderEntriesInfo;
typedef std::map<S32,LLUUID> index_map_t;
index_map_t mLRU; // index, id; stored as a map for fast removal
typedef std::map<LLUUID,S32> id_map_t;
id_map_t mHeaderIDMap;
// BODIES (TEXTURES minus headers)
std::string mTexturesDirName;
std::string mTexturesDirEntriesFileName;
typedef std::map<LLUUID,S32> size_map_t;
size_map_t mTexturesSizeMap;
S64 mTexturesSizeTotal;
LLAtomic32<BOOL> mDoPurge;
// Statics
static F32 sHeaderCacheVersion;
static U32 sCacheMaxEntries;
static S64 sCacheMaxTexturesSize;
};
#endif // LL_LLTEXTURECACHE_H
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