/*****************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>

You can Freely distribute this program under the GNU General Public
License. See the file "COPYING" for the exact licensing terms.
******************************************************************/

#include "scene_xrender.h"

#ifdef HAVE_XRENDER

#include "toplevel.h"

namespace KWinInternal
{

//****************************************
// SceneXrender
//****************************************

SceneXrender::SceneXrender( Workspace* ws )
    : Scene( ws )
    {
    format = XRenderFindVisualFormat( display(), DefaultVisual( display(), DefaultScreen( display())));
    XRenderPictureAttributes pa;
    pa.subwindow_mode = IncludeInferiors;
    front = XRenderCreatePicture( display(), rootWindow(), format, CPSubwindowMode, &pa );
    createBuffer();
    }

SceneXrender::~SceneXrender()
    {
    XRenderFreePicture( display(), front );
    XRenderFreePicture( display(), buffer );
    }

// TODO handle xrandr changes

void SceneXrender::createBuffer()
    {
    if( buffer != None )
        XRenderFreePicture( display(), buffer );
    Pixmap pixmap = XCreatePixmap( display(), rootWindow(), displayWidth(), displayHeight(), QX11Info::appDepth());
    buffer = XRenderCreatePicture( display(), pixmap, format, 0, 0 );
    XFreePixmap( display(), pixmap ); // The picture owns the pixmap now
    }

void SceneXrender::paint()
    {
    XRenderColor col = { 0xffff, 0xffff, 0xffff, 0xffff };
    XRenderFillRectangle( display(), PictOpSrc, buffer, &col, 0, 0, displayWidth(), displayHeight());
    for( ToplevelList::ConstIterator it = windows.begin();
         it != windows.end();
         ++it )
        {
        QRect r = (*it)->geometry().intersect( QRect( 0, 0, displayWidth(), displayHeight()));
        if( !r.isEmpty())
            {
            XWindowAttributes attrs;
            if( !XGetWindowAttributes( display(), (*it)->handle(), &attrs ))
                continue;
            if( XRenderPictFormat* clientFormat = XRenderFindVisualFormat( display(), attrs.visual ))
                {
                Picture picture = XRenderCreatePicture( display(), (*it)->windowPixmap(), clientFormat, 0, 0 );
                XRenderComposite( display(), PictOpSrc, picture, None, buffer, 0, 0, 0, 0,
                    (*it)->x(), (*it)->y(), (*it)->width(), (*it)->height());
                }
            }
        }
    XRenderComposite( display(), PictOpSrc, buffer, None, front, 0, 0, 0, 0, 0, 0, displayWidth(), displayHeight());
    XFlush( display());
    }

} // namespace
#endif