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179 lines
3.7 KiB
179 lines
3.7 KiB
/* ============================================================
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*
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* This file is a part of digiKam project
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* http://www.digikam.org
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*
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* Date : 2005-02-05
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* Description : undo cache manager for image editor
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*
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* Copyright (C) 2005 by Renchi Raju <renchi@pooh.tam.uiuc.edu>
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* Copyright (C) 2005 by Joern Ahrens <joern.ahrens@kdemail.net>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software Foundation;
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* either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ============================================================ */
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// C Ansi includes.
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extern "C"
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{
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#include <unistd.h>
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}
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// TQt includes.
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#include <tqcstring.h>
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#include <tqstring.h>
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#include <tqfile.h>
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#include <tqdatastream.h>
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#include <tqstringlist.h>
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// KDE includes.
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#include <kstandarddirs.h>
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#include <kaboutdata.h>
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#include <kinstance.h>
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#include <kglobal.h>
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// Local includes.
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#include "ddebug.h"
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#include "undocache.h"
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namespace Digikam
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{
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class UndoCachePriv
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{
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public:
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TQString cachePrefix;
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TQStringList cacheFilenames;
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};
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UndoCache::UndoCache()
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{
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d = new UndoCachePriv;
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TQString cacheDir;
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cacheDir = locateLocal("cache",
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KGlobal::instance()->aboutData()->programName() + '/');
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d->cachePrefix = TQString("%1undocache-%2")
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.tqarg(cacheDir)
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.tqarg(getpid());
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}
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UndoCache::~UndoCache()
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{
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clear();
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delete d;
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}
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/**
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* delete all cache files
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*/
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void UndoCache::clear()
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{
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for (TQStringList::iterator it = d->cacheFilenames.begin();
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it != d->cacheFilenames.end(); ++it)
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{
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::unlink(TQFile::encodeName(*it));
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}
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d->cacheFilenames.clear();
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}
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/**
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* write the data into a cache file
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*/
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bool UndoCache::putData(int level, int w, int h, int bytesDepth, uchar* data)
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{
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TQString cacheFile = TQString("%1-%2.bin")
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.tqarg(d->cachePrefix)
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.tqarg(level);
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TQFile file(cacheFile);
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if (file.exists() || !file.open(IO_WriteOnly))
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return false;
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TQDataStream ds(&file);
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ds << w;
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ds << h;
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ds << bytesDepth;
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TQByteArray ba(w*h*bytesDepth);
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memcpy (ba.data(), data, w*h*bytesDepth);
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ds << ba;
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file.close();
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d->cacheFilenames.append(cacheFile);
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return true;
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}
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/**
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* get the data from a cache file
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*/
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uchar* UndoCache::getData(int level, int& w, int& h, int& bytesDepth, bool del)
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{
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TQString cacheFile = TQString("%1-%2.bin")
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.tqarg(d->cachePrefix)
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.tqarg(level);
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TQFile file(cacheFile);
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if (!file.open(IO_ReadOnly))
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return 0;
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TQDataStream ds(&file);
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ds >> w;
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ds >> h;
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ds >> bytesDepth;
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uchar *data = new uchar[w*h*bytesDepth];
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if (!data)
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return 0;
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TQByteArray ba(w*h*bytesDepth);
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ds >> ba;
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memcpy (data, ba.data(), w*h*bytesDepth);
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file.close();
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if(del)
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{
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::unlink(TQFile::encodeName(cacheFile));
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d->cacheFilenames.remove(cacheFile);
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}
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return data;
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}
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/**
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* delete a cache file
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*/
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void UndoCache::erase(int level)
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{
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TQString cacheFile = TQString("%1-%2.bin")
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.tqarg(d->cachePrefix)
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.tqarg(level);
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if(d->cacheFilenames.find(cacheFile) == d->cacheFilenames.end())
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return;
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::unlink(TQFile::encodeName(cacheFile));
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}
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} // namespace Digikam
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