src/TransparentWindow.h

/*
 *   O         ,-
 *  ° o    . -´  '     ,-
 *   °  .´        ` . ´,´
 *     ( °   ))     . (
 *      `-;_    . -´ `.`.
 *          `._'       ´
 *
 * Copyright (c) 2007-2010 Markus Fisch <mf@markusfisch.de>
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/mit-license.php
 */
#ifndef _PieDock_TransparentWindow_
#define _PieDock_TransparentWindow_

#include "Application.h"
#include "XSurface.h"

#include <X11/Xlib.h>

#ifdef HAVE_XRENDER
#include <X11/extensions/Xrender.h>
#endif

namespace PieDock
{
    class TransparentWindow
    {
        public:
            TransparentWindow( Application & );
            virtual ~TransparentWindow();
            inline const Window &getWindow() const { return window; }
            virtual void appear() {}
            virtual void draw() {}
            virtual bool processEvent( XEvent & ) { return false; }

        protected:
            inline Application *getApp() const { return app; }
            inline const int &getWidth() const { return width; }
            inline const int &getHeight() const { return height; }
            inline XSurface *getCanvas() const { return canvas; }
            inline const GC &getGc() const { return gc; }
#ifdef HAVE_XRENDER
            inline const Pixmap &getAlphaPixmap() const { return alphaPixmap; }
            inline virtual void composite() const
            {
                XRenderComposite(
                    app->getDisplay(),
                    PictOpOver,
                    windowPicture,
                    None,
                    alphaPicture,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    width,
                    height );
            }
#endif
            virtual void show();
            virtual void hide() const;
            virtual void clear();
            virtual void update() const;

        private:
            Application *app;
            Window window;
            int width;
            int height;
            XSurface *canvas;
            unsigned char *buffer;
            GC gc;
#ifdef HAVE_XRENDER
            Pixmap alphaPixmap;
            Picture windowPicture;
            Picture alphaPicture;
#endif
    };
}

#endif