kwin/effects/_test/demo_showpicture.cpp

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

Copyright (C) 2007 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 "demo_showpicture.h"

#include <kstandarddirs.h>
#include <qimage.h>

namespace KWin
{

KWIN_EFFECT(demo_showpicture, ShowPictureEffect)

ShowPictureEffect::ShowPictureEffect()
    : init(true)
    , picture(NULL)
{
}

ShowPictureEffect::~ShowPictureEffect()
{
    delete picture;
}

void ShowPictureEffect::paintScreen(int mask, QRegion region, ScreenPaintData& data)
{
    effects->paintScreen(mask, region, data);
    if (init) {
        loadPicture();
        init = false;
    }
    if (picture && region.intersects(pictureRect)) {
        glPushAttrib(GL_CURRENT_BIT | GL_ENABLE_BIT);
        picture->bind();
        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        picture->render(region, pictureRect);
        picture->unbind();
        glPopAttrib();
    }
}

void ShowPictureEffect::loadPicture()
{
    QString file = KGlobal::dirs()->findResource("appdata", "showpicture.png");
    if (file.isEmpty())
        return;
    QImage im(file);
    QRect area = effects->clientArea(PlacementArea, effects->activeScreen(), effects->currentDesktop());
    picture = new GLTexture(im);
    pictureRect = QRect(area.x() + (area.width() - im.width()) / 2,
                        area.y() + (area.height() - im.height()) / 2, im.width(), im.height());
}

} // namespace