From a6d58bb6052ac8cb01805a48c4ad2f129126116f Mon Sep 17 00:00:00 2001
From: tpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>
Date: Wed, 24 Feb 2010 02:13:59 +0000
Subject: Added KDE3 version of kvirc

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/kvirc@1095341 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
---
 src/kvilib/ext/kvi_doublebuffer.h | 62 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/kvilib/ext/kvi_doublebuffer.h

(limited to 'src/kvilib/ext/kvi_doublebuffer.h')

diff --git a/src/kvilib/ext/kvi_doublebuffer.h b/src/kvilib/ext/kvi_doublebuffer.h
new file mode 100644
index 00000000..103759a1
--- /dev/null
+++ b/src/kvilib/ext/kvi_doublebuffer.h
@@ -0,0 +1,62 @@
+#ifndef _KVI_DOUBLEBUFFER_H_
+#define _KVI_DOUBLEBUFFER_H_
+//=============================================================================
+//
+//   File : kvi_doublebuffer.h
+//   Created on Fri 27 Jan 2006 18:59:54 by Szymon Stefanek
+//
+//   This file is part of the KVIrc IRC Client distribution
+//   Copyright (C) 2006 Szymon Stefanek <pragma at kvirc dot 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
+//   of the License, or (at your opinion) 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.
+//
+//   You should have received a copy of the GNU General Public License
+//   along with this program. If not, write to the Free Software Foundation,
+//   Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+//=============================================================================
+
+#include "kvi_settings.h"
+
+#include <qpixmap.h>
+
+//
+// This class is basically a huge shared memory pixmap meant to be used in double-buffer
+// painting operations. The memory buffer is resized on the fly so you will always obtain
+// a pixmap that is at least of the specified size. The problem is that this is a time
+// consuming operation (not good in a paint event). We solve it by keeping the buffer
+// with the greatest requested size in the last N minutes.
+//
+// The keyword in all this thingie is "memory is cheap, processing time is not".
+// We know in advance that KVIrc needs a huge double buffer anyway...
+// So we basically grow instantly but we are really lazy at shrinking.
+//
+
+class KVILIB_API KviDoubleBuffer
+{
+public:
+	KviDoubleBuffer(unsigned int uWidth,unsigned int uHeight);
+	~KviDoubleBuffer();
+public:
+	// This returns a pointer to the memory buffer. The buffer is at least
+	// of the size declared in the constructor.
+	QPixmap * pixmap();
+
+	// The stuff below is internal (used only by KviApp)
+
+	// to be called at application initialisation and cleanup
+	static void init();
+	static void done();
+	// this has to be called at sensible intervals (like 2 minutes)
+	static void heartbeat();
+};
+
+#endif //!_KVI_DOUBLEBUFFER_H_
-- 
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