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.cpp | 90 +++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/kvilib/ext/kvi_doublebuffer.cpp

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

diff --git a/src/kvilib/ext/kvi_doublebuffer.cpp b/src/kvilib/ext/kvi_doublebuffer.cpp
new file mode 100644
index 00000000..5997e934
--- /dev/null
+++ b/src/kvilib/ext/kvi_doublebuffer.cpp
@@ -0,0 +1,90 @@
+//=============================================================================
+//
+//   File : kvi_doublebuffer.cpp
+//   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.
+//
+//=============================================================================
+
+#define __KVILIB__
+
+#include "kvi_doublebuffer.h"
+
+static QPixmap * g_pMemoryPixmap = 0;
+static unsigned int g_uMaxRequestedWidth = 0;
+static unsigned int g_uMaxRequestedHeight = 0;
+
+KviDoubleBuffer::KviDoubleBuffer(unsigned int uWidth,unsigned int uHeight)
+{
+	if((g_pMemoryPixmap->width() < uWidth) || (g_pMemoryPixmap->height() < uHeight))
+	{
+		// The memory buffer is too small
+		// There is either no such user requirement or it has grown by the meantime
+		unsigned int uMaxW = uWidth > g_pMemoryPixmap->width() ? uWidth : g_pMemoryPixmap->width();
+		unsigned int uMaxH = uHeight > g_pMemoryPixmap->height() ? uHeight : g_pMemoryPixmap->height();
+#ifdef COMPILE_USE_QT4
+		// QT4SUX: QPixmap::resize() is missing (it's a widely used function and assigning a new QPixmap() seems to be slower and not intuitive)
+		*g_pMemoryPixmap = QPixmap(uMaxW,uMaxH);
+#else
+		g_pMemoryPixmap->resize(uMaxW,uMaxH);
+#endif
+	}
+
+	if(uWidth > g_uMaxRequestedWidth)g_uMaxRequestedWidth = uWidth;
+	if(uHeight > g_uMaxRequestedHeight)g_uMaxRequestedHeight = uHeight;
+}
+
+KviDoubleBuffer::~KviDoubleBuffer()
+{
+	// We never shrink here (it's time consuming)
+}
+
+QPixmap * KviDoubleBuffer::pixmap()
+{
+	return g_pMemoryPixmap;
+}
+
+void KviDoubleBuffer::init()
+{
+	if(g_pMemoryPixmap)return;
+	g_pMemoryPixmap = new QPixmap();
+}
+
+void KviDoubleBuffer::done()
+{
+	if(!g_pMemoryPixmap)return;
+	delete g_pMemoryPixmap;
+	g_pMemoryPixmap = 0;
+}
+
+void KviDoubleBuffer::heartbeat()
+{
+	if(((g_uMaxRequestedHeight + 64) < g_pMemoryPixmap->height()) || ((g_uMaxRequestedWidth + 64) < g_pMemoryPixmap->width()))
+	{
+		// do shrink :)
+#ifdef COMPILE_USE_QT4
+		// QT4SUX: QPixmap::resize() is missing (it's a widely used function and assigning a new QPixmap() seems to be slower and not intuitive)
+		*g_pMemoryPixmap = QPixmap(g_uMaxRequestedWidth,g_uMaxRequestedHeight);
+#else
+		g_pMemoryPixmap->resize(g_uMaxRequestedWidth,g_uMaxRequestedHeight);
+#endif
+	}
+	g_uMaxRequestedHeight = 0;
+	g_uMaxRequestedWidth = 0;
+}
-- 
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