Commit d194f743 authored by Luboš Luňák's avatar Luboš Luňák

Reduce wallpaper repaints during desktop switching.

svn path=/trunk/kdebase/kwin/; revision=90111
parent 67f1c999
......@@ -2032,6 +2032,71 @@ void Workspace::refresh() {
XFlush(qt_xdisplay());
}
/*!
During virt. desktop switching, desktop areas covered by windows that are
going to be hidden are first obscured by new windows with no background
( i.e. transparent ) placed right below the windows. These invisible windows
are removed after the switch is complete.
Reduces desktop ( wallpaper ) repaints during desktop switching
*/
class ObscuringWindows
{
public:
~ObscuringWindows();
void create( Client* c );
private:
QValueList<Window> obscuring_windows;
static QValueList<Window>* cached;
static unsigned int max_cache_size;
};
QValueList<Window>* ObscuringWindows::cached = NULL;
unsigned int ObscuringWindows::max_cache_size = 0;
void ObscuringWindows::create( Client* c )
{
if( cached == NULL )
cached = new QValueList<Window>;
Window obs_win;
XWindowChanges chngs;
int mask = CWSibling | CWStackMode;
if( cached->count() > 0 ) {
cached->remove( obs_win = cached->first());
chngs.x = c->x();
chngs.y = c->y();
chngs.width = c->width();
chngs.height = c->height();
mask |= CWX | CWY | CWWidth | CWHeight;
}
else {
XSetWindowAttributes a;
a.background_pixmap = None;
a.override_redirect = True;
obs_win = XCreateWindow( qt_xdisplay(), qt_xrootwin(), c->x(), c->y(),
c->width(), c->height(), 0, CopyFromParent, InputOutput,
CopyFromParent, CWBackPixmap | CWOverrideRedirect, &a );
}
chngs.sibling = c->winId();
chngs.stack_mode = Below;
XConfigureWindow( qt_xdisplay(), obs_win, mask, &chngs );
XMapWindow( qt_xdisplay(), obs_win );
obscuring_windows.append( obs_win );
}
ObscuringWindows::~ObscuringWindows()
{
max_cache_size = QMAX( max_cache_size, obscuring_windows.count() + 4 ) - 1;
for( QValueList<Window>::ConstIterator it = obscuring_windows.begin();
it != obscuring_windows.end();
++it ) {
XUnmapWindow( qt_xdisplay(), *it );
if( cached->count() < max_cache_size )
cached->prepend( *it );
else
XDestroyWindow( qt_xdisplay(), *it );
}
}
/*!
Sets the current desktop to \a new_desktop
......@@ -2056,9 +2121,12 @@ void Workspace::setCurrentDesktop( int new_desktop ){
mapping done from front to back => less exposure events
*/
Events::raise((Events::Event) (Events::DesktopChange+new_desktop));
ObscuringWindows obs_wins;
for ( ClientList::ConstIterator it = stacking_order.begin(); it != stacking_order.end(); ++it) {
if ( (*it)->isVisible() && !(*it)->isOnDesktop( new_desktop ) ) {
obs_wins.create( *it );
(*it)->hide();
unmapList += (*it);
}
......
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