1 files changed, 178 insertions, 0 deletions
diff --git a/src/utilities/imageeditor/canvas/undocache.cpp b/src/utilities/imageeditor/canvas/undocache.cpp
new file mode 100644
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--- /dev/null
+++ b/src/utilities/imageeditor/canvas/undocache.cpp
@@ -0,0 +1,178 @@
+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2005-02-05
+ * Description : undo cache manager for image editor
+ * 
+ * Copyright (C) 2005 by Renchi Raju <renchi@pooh.tam.uiuc.edu>
+ * Copyright (C) 2005 by Joern Ahrens <joern.ahrens@kdemail.net>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software Foundation;
+ * either version 2, or (at your option)
+ * any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * ============================================================ */
+
+// C Ansi includes.
+
+extern "C"
+{
+#include <unistd.h>
+}
+
+// TQt includes.
+
+#include <tqcstring.h>
+#include <tqstring.h>
+#include <tqfile.h>
+#include <tqdatastream.h>
+#include <tqstringlist.h>
+
+// KDE includes.
+
+#include <kstandarddirs.h>
+#include <tdeaboutdata.h>
+#include <kinstance.h>
+#include <tdeglobal.h>
+
+// Local includes.
+
+#include "ddebug.h"
+#include "undocache.h"
+
+namespace Digikam
+{
+
+class UndoCachePriv
+{
+public:
+
+    TQString     cachePrefix;
+    TQStringList cacheFilenames;
+};
+
+UndoCache::UndoCache()
+{
+    d = new UndoCachePriv;
+
+    TQString cacheDir;
+    cacheDir = locateLocal("cache", 
+                           TDEGlobal::instance()->aboutData()->programName() + '/');
+
+    d->cachePrefix = TQString("%1undocache-%2")
+                             .arg(cacheDir)
+                             .arg(getpid());
+}
+
+UndoCache::~UndoCache()
+{
+    clear();
+    delete d;
+}
+
+/**
+ * delete all cache files
+ */
+void UndoCache::clear()
+{
+    for (TQStringList::iterator it = d->cacheFilenames.begin();
+         it != d->cacheFilenames.end(); ++it)
+    {
+        ::unlink(TQFile::encodeName(*it));
+    }
+
+    d->cacheFilenames.clear();
+}
+
+/**
+ * write the data into a cache file
+ */
+bool UndoCache::putData(int level, int w, int h, int bytesDepth, uchar* data)
+{
+    TQString cacheFile = TQString("%1-%2.bin")
+                        .arg(d->cachePrefix)
+                        .arg(level);
+
+    TQFile file(cacheFile);
+    
+    if (file.exists() || !file.open(IO_WriteOnly))
+        return false;
+
+    TQDataStream ds(&file);
+    ds << w;
+    ds << h;
+    ds << bytesDepth;
+
+    TQByteArray ba(w*h*bytesDepth);
+    memcpy (ba.data(), data, w*h*bytesDepth);
+    ds << ba;
+
+    file.close();
+
+    d->cacheFilenames.append(cacheFile);
+
+    return true;
+}
+
+/**
+ * get the data from a cache file
+ */
+uchar* UndoCache::getData(int level, int& w, int& h, int& bytesDepth, bool del)
+{
+    TQString cacheFile = TQString("%1-%2.bin")
+                        .arg(d->cachePrefix)
+                        .arg(level);
+
+    TQFile file(cacheFile);
+    if (!file.open(IO_ReadOnly))
+        return 0;
+
+    TQDataStream ds(&file);
+    ds >> w;
+    ds >> h;
+    ds >> bytesDepth;
+
+    uchar *data = new uchar[w*h*bytesDepth];
+    if (!data)
+        return 0;
+
+    TQByteArray ba(w*h*bytesDepth);
+    ds >> ba;
+    memcpy (data, ba.data(), w*h*bytesDepth);
+    
+    file.close();
+
+    if(del)
+    {
+        ::unlink(TQFile::encodeName(cacheFile));
+        d->cacheFilenames.remove(cacheFile);
+    }
+
+    return data;
+}
+
+/**
+ * delete a cache file
+ */
+void UndoCache::erase(int level)
+{
+    TQString cacheFile = TQString("%1-%2.bin")
+                        .arg(d->cachePrefix)
+                        .arg(level);
+
+    if(d->cacheFilenames.find(cacheFile) == d->cacheFilenames.end())
+        return;
+    
+    ::unlink(TQFile::encodeName(cacheFile));
+}
+
+}  // namespace Digikam