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# ksharedpixmap.cpp

    00001 /* vi: ts=8 sts=4 sw=4
    00002  *
    00003  *
    00004  * This file is part of the KDE libraries.
    00005  * Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
    00006  *
    00007  * This library is free software; you can redistribute it and/or
    00008  * modify it under the terms of the GNU Library General Public
    00009  * License as published by the Free Software Foundation; either
    00010  * version 2 of the License, or (at your option) any later version.
    00011  *
    00012  * Shared pixmap client for KDE.
    00013  */
    00014 #include "config.h"
    00015
    00016 #include <qrect.h>
    00017 #include <qsize.h>
    00018 #include <qstring.h>
    00019 #include <qpixmap.h>
    00020 #include <qwindowdefs.h>
    00021 #include <qwidget.h>
    00022
    00023 #ifdef Q_WS_X11
    00024
    00025 #include <kapplication.h>
    00026 #include <krootprop.h>
    00027 #include <ksharedpixmap.h>
    00028 #include <kdebug.h>
    00029 #include <stdlib.h> // for abs
    00030
    00031 #include <X11/Xlib.h>
    00032
    00033 // Make sure to include all this X-based shit before we clean up the mess.
    00034 // Needed for --enable-final. Not needed by this file itself!
    00035 #include <X11/Xutil.h>
    00036 #ifdef HAVE_MITSHM
    00037 #include <X11/extensions/XShm.h>
    00038 #endif
    00039
    00040 #include <netwm.h>
    00041
    00042 // Clean up the mess
    00043
    00044 #undef Bool
    00045 #undef Above
    00046 #undef Below
    00047 #undef KeyPress
    00048 #undef KeyRelease
    00049 #undef FocusOut
    00050
    00055 class KSharedPixmapPrivate
    00056 {
    00057 public:
    00058   Atom pixmap;
    00059   Atom target;
    00060   Atom selection;
    00061   QRect rect;
    00062 };
    00063
    00064 KSharedPixmap::KSharedPixmap()
    00065     : QWidget(0L, "shpixmap comm window")
    00066 {
    00067     d = new KSharedPixmapPrivate;
    00068     init();
    00069 }
    00070
    00071
    00072 KSharedPixmap::~KSharedPixmap()
    00073 {
    00074     delete d;
    00075 }
    00076
    00077
    00078 void KSharedPixmap::init()
    00079 {
    00080     d->pixmap = XInternAtom(qt_xdisplay(), "PIXMAP", false);
    00081     QCString atom;
    00082     atom.sprintf("target prop for window %lx", static_cast<unsigned long int>(winId()));
    00083     d->target = XInternAtom(qt_xdisplay(), atom.data(), false);
    00084     d->selection = None;
    00085 }
    00086
    00087
    00088 bool KSharedPixmap::isAvailable(const QString & name) const
    00089 {
    00090     QString str = QString("KDESHPIXMAP:%1").arg(name);
    00091     Atom sel = XInternAtom(qt_xdisplay(), str.latin1(), true);
    00092     if (sel == None)
    00093     return false;
    00094     return XGetSelectionOwner(qt_xdisplay(), sel) != None;
    00095 }
    00096
    00097
    00098 bool KSharedPixmap::loadFromShared(const QString & name, const QRect & rect)
    00099 {
    00100     d->rect = rect;
    00101     if (d->selection != None)
    00102     // already active
    00103     return false;
    00104
    00105     QPixmap::resize(0, 0); // invalidate
    00106
    00107     QString str = QString("KDESHPIXMAP:%1").arg(name);
    00108     d->selection = XInternAtom(qt_xdisplay(), str.latin1(), true);
    00109     if (d->selection == None)
    00110     return false;
    00111     if (XGetSelectionOwner(qt_xdisplay(), d->selection) == None)
    00112     {
    00113     d->selection = None;
    00114     return false;
    00115     }
    00116
    00117     XConvertSelection(qt_xdisplay(), d->selection, d->pixmap, d->target,
    00118         winId(), CurrentTime);
    00119     return true;
    00120 }
    00121
    00122
    00123 bool KSharedPixmap::x11Event(XEvent *event)
    00124 {
    00125     if (event->type != SelectionNotify)
    00126     return false;
    00127
    00128     XSelectionEvent *ev = &event->xselection;
    00129     if (ev->selection != d->selection)
    00130     return false;
    00131
    00132     if ((ev->target != d->pixmap) || (ev->property == None))
    00133     {
    00134     kdWarning(270) << k_funcinfo << "illegal selection notify event.\n";
    00135     d->selection = None;
    00136     emit done(false);
    00137     return true;
    00138     }
    00139
    00140     // Read pixmap handle from ev->property
    00141
    00142     int dummy, format;
    00143     unsigned long nitems, ldummy;
    00144     Drawable *pixmap_id;
    00145     Atom type;
    00146
    00147     XGetWindowProperty(qt_xdisplay(), winId(), ev->property, 0, 1, false,
    00148         d->pixmap, &type, &format, &nitems, &ldummy,
    00149         (unsigned char **) &pixmap_id);
    00150
    00151     if (nitems != 1)
    00152     {
    00153     kdWarning(270) << k_funcinfo << "could not read property, nitems = " << nitems << "\n";
    00154     emit done(false);
    00155     return true;
    00156     }
    00157
    00158     Window root;
    00159     unsigned int width, height, udummy;
    00160     XGetGeometry(qt_xdisplay(), *pixmap_id, &root, &dummy, &dummy, &width,
    00161         &height, &udummy, &udummy);
    00162
    00163     if (d->rect.isEmpty())
    00164     {
    00165     QPixmap::resize(width, height);
    00166     XCopyArea(qt_xdisplay(), *pixmap_id, ((KPixmap*)this)->handle(), qt_xget_temp_gc(qt_xscreen(), false),
    00167         0, 0, width, height, 0, 0);
    00168
    00169         XFree(pixmap_id);
    00170     XDeleteProperty(qt_xdisplay(), winId(), ev->property);
    00171     d->selection = None;
    00172     emit done(true);
    00173     return true;
    00174     }
    00175
    00176     // Do some more processing here: Generate a tile that can be used as a
    00177     // background tile for the rectangle "rect".
    00178
    00179     //Check for origin off screen
    00180     QPoint origin(0, 0);
    00181     if(  d->rect.topLeft().x() < 0 ||  d->rect.topLeft().y() < 0 ) {
    00182         //Save the offset and relocate the rect corners
    00183         QPoint tl = d->rect.topLeft();
    00184         QPoint br = d->rect.bottomRight();
    00185         if( tl.x() < 0 ) {
    00186             origin.setX( abs( tl.x() ) );
    00187             tl.setX( 0 );
    00188         }
    00189         if( tl.y() < 0 ) {
    00190             origin.setY( abs( tl.y() ) );
    00191             tl.setY( 0 );
    00192         }
    00193         QRect adjustedRect( tl, br );
    00194         d->rect = adjustedRect;
    00195     }
    00196
    00197     unsigned w = d->rect.width(), h = d->rect.height();
    00198     unsigned tw = QMIN(width, w), th = QMIN(height, h);
    00199     unsigned xa = d->rect.x() % width, ya = d->rect.y() % height;
    00200     unsigned t1w = QMIN(width-xa,tw), t1h = QMIN(height-ya,th);
    00201
    00202     QPixmap::resize( tw+origin.x(), th+origin.y() );
    00203
    00204     XCopyArea(qt_xdisplay(), *pixmap_id, ((KPixmap*)this)->handle(), qt_xget_temp_gc(qt_xscreen(), false),
    00205             xa, ya, t1w+origin.x(), t1h+origin.y(), origin.x(), origin.y() );
    00206     XCopyArea(qt_xdisplay(), *pixmap_id, ((KPixmap*)this)->handle(), qt_xget_temp_gc(qt_xscreen(), false),
    00207         0, ya, tw-t1w, t1h, t1w, 0);
    00208     XCopyArea(qt_xdisplay(), *pixmap_id, ((KPixmap*)this)->handle(), qt_xget_temp_gc(qt_xscreen(), false),
    00209         xa, 0, t1w, th-t1h, 0, t1h);
    00210     XCopyArea(qt_xdisplay(), *pixmap_id, ((KPixmap*)this)->handle(), qt_xget_temp_gc(qt_xscreen(), false),
    00211         0, 0, tw-t1w, th-t1h, t1w, t1h);
    00212
    00213     XFree(pixmap_id);
    00214
    00215     d->selection = None;
    00216     XDeleteProperty(qt_xdisplay(), winId(), ev->property);
    00217     emit done(true);
    00218     return true;
    00219 }
    00220
    00221
    00222 #include "ksharedpixmap.moc"
    00223 #endif

This file is part of the documentation for kdeui Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:20:22 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003