cached pixmap helper, works like auto ptr for cached pixmaps

src/FbTk/CachedPixmap.cc

@@ -0,0 +1,51 @@
+// CachedPixmap.hh
+// Copyright (c) 2006 Fluxbox Team (fluxgen at fluxbox dot org)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#include "CachedPixmap.hh"
+#include "ImageControl.hh"
+
+namespace FbTk {
+
+CachedPixmap::CachedPixmap( FbTk::ImageControl& ctrl ):
+    m_pixmap( 0 ),
+    m_ctrl( ctrl ) {
+}
+
+CachedPixmap::CachedPixmap( FbTk::ImageControl& ctrl, Pixmap pm ):
+    m_pixmap( pm ),
+    m_ctrl( ctrl ) { }
+
+CachedPixmap::~CachedPixmap() {
+    destroy();
+}
+
+void CachedPixmap::reset( Pixmap pm ) {
+    destroy();
+    m_pixmap = pm;
+}
+
+void CachedPixmap::destroy() {
+    if ( m_pixmap != 0 ) {
+        m_ctrl.removeImage( m_pixmap );
+    }
+}
+
+}

src/FbTk/CachedPixmap.hh

@@ -0,0 +1,70 @@
+// CachedPixmap.hh
+// Copyright (c) 2006 Fluxbox Team (fluxgen at fluxbox dot org)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+
+#ifndef FBTK_CACHED_PIXMAP_H
+#define FBTK_CACHED_PIXMAP_H
+
+#include <X11/Xlib.h>
+
+namespace FbTk {
+
+class ImageControl;
+
+/// holds cached pixmap and releases it from cache when it dies
+class CachedPixmap {
+public:
+    /// @param ctrl the image cache control
+    explicit CachedPixmap( FbTk::ImageControl& ctrl );
+    /**
+     * @param ctrl cache control
+     * @param pm pixmap to store
+     */
+    CachedPixmap( FbTk::ImageControl& ctrl,
+                  Pixmap pm );
+    ~CachedPixmap();
+
+    operator Pixmap() const { 
+        return m_pixmap;
+    }
+
+    /**
+     * Sets new pixmap and releases the old pixmap from cache
+     * @param pm the new pixmap to set
+     */
+    void reset( Pixmap pm );
+
+    /// @return pixmap
+    Pixmap operator *() const {
+        return m_pixmap;
+    }
+
+public:
+    /// releases pixmap from cache
+    void destroy();
+
+    Pixmap m_pixmap; //< cached pixmap
+    FbTk::ImageControl &m_ctrl; //< cache control
+};
+
+} // namespace CachedPixmap
+
+#endif // FBTK_CACHED_PIXMAP