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/***************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (directui@nokia.com)
**
** This file is part of mcompositor.
**
** If you have questions regarding the use of this file, please contact
** Nokia at directui@nokia.com.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation
** and appearing in the file LICENSE.LGPL included in the packaging
** of this file.
**
****************************************************************************/
#include <QX11Info>
#include <QKeySequence>
#include <QKeyEvent>
#include <QEvent>
#include <QTimer>
#include <QApplication>
#include <QDesktopWidget>
#include "mcompositewindow.h"
#include "mcompositescene.h"
#include "mcompositewindowgroup.h"
#include <X11/extensions/Xfixes.h>
#ifdef HAVE_SHAPECONST
#include <X11/extensions/shapeconst.h>
#else
#include <X11/extensions/shape.h>
#endif
#include <X11/extensions/Xcomposite.h>
static int error_handler(Display * , XErrorEvent *error)
{
if (error->resourceid == QX11Info::appRootWindow() && error->error_code == BadAccess) {
qCritical("Another window manager is running.");
::exit(0);
}
if (error->error_code == BadMatch)
qDebug() << "Bad match error " << error->resourceid;
return 0;
}
MCompositeScene::MCompositeScene(QObject *p)
: QGraphicsScene(p)
{
setBackgroundBrush(Qt::NoBrush);
setForegroundBrush(Qt::NoBrush);
setSceneRect(QRect(0, 0,
QApplication::desktop()->width(),
QApplication::desktop()->height()));
installEventFilter(this);
}
void MCompositeScene::prepareRoot()
{
Display *dpy = QX11Info::display();
Window root = QX11Info::appRootWindow();
XSetWindowAttributes sattr;
sattr.event_mask = SubstructureRedirectMask | SubstructureNotifyMask | StructureNotifyMask | PropertyChangeMask;
// All newly mapped windows should be redirected to avoid double Expose
XCompositeRedirectSubwindows(dpy, root, CompositeRedirectManual);
XChangeWindowAttributes(dpy, root, CWEventMask, &sattr);
XSelectInput(dpy, root, SubstructureNotifyMask | SubstructureRedirectMask
| StructureNotifyMask | PropertyChangeMask
| FocusChangeMask);
XSetErrorHandler(error_handler);
}
void MCompositeScene::drawItems(QPainter *painter, int numItems, QGraphicsItem *items[], const QStyleOptionGraphicsItem options[], QWidget *widget)
{
QRegion visible(sceneRect().toRect());
QVector<int> to_paint(10);
int size = 0;
bool desktop_painted = false;
// visibility is determined from top to bottom
for (int i = numItems - 1; i >= 0; --i) {
MCompositeWindow *cw = (MCompositeWindow *) items[i];
if (cw->type() != MCompositeWindowGroup::Type) {
if (!cw->propertyCache()) // this window is dead
continue;
if (cw->hasTransitioningWindow() && cw->propertyCache()->isDecorator())
// if we have a transition animation, don't draw the decorator
// lest we can have it drawn with the transition (especially
// when desktop window is not yet shown, NB#192454)
continue;
if (cw->isDirectRendered() || !cw->isVisible()
|| !(cw->propertyCache()->isMapped() || cw->isWindowTransitioning())
|| cw->propertyCache()->isInputOnly())
continue;
if (visible.isEmpty())
// nothing below is visible anymore
break;
}
// Ensure that intersects() still work, otherwise, painting a window
// is skipped when another window above it is scaled or moved to an
// area that exposed the lower window and causes an ugly flicker.
// r reflects the applied transformation and position of the window
QRegion r = cw->sceneTransform().map(cw->propertyCache()->shapeRegion());
// transitioning window can be smaller than shapeRegion(), so paint
// all transitioning windows
if (cw->isWindowTransitioning() || visible.intersects(r)
|| cw->type() == MCompositeWindowGroup::Type) {
if (size >= 9)
to_paint.resize(to_paint.size()+1);
to_paint[size++] = i;
if (cw->propertyCache()->windowTypeAtom()
== ATOM(_NET_WM_WINDOW_TYPE_DESKTOP))
desktop_painted = true;
}
// subtract opaque regions
if (!cw->isWindowTransitioning()
&& !cw->propertyCache()->hasAlpha()
&& cw->opacity() == 1.0
&& !cw->windowGroup()) // window is renderered off-screen)
visible -= r;
}
if (size > 0) {
// paint from bottom to top so that blending works
for (int i = size - 1; i >= 0; --i) {
int item_i = to_paint[i];
painter->save();
if (!desktop_painted) {
// clear rubbish from the root window during startup when
// desktop window does not exist and we show zoom animations
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
desktop_painted = true;
if (((MCompositeWindow*)items[item_i])->
propertyCache()->isDecorator()) {
// don't paint decorator on top of plain black background
// (see NB#182860, NB#192454)
painter->restore();
continue;
}
}
// TODO: paint only the intersected region (glScissor?)
painter->setMatrix(items[item_i]->sceneMatrix(), true);
items[item_i]->paint(painter, &options[item_i], widget);
painter->restore();
}
}
}
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