Add krootbacking interface to kdeartwork

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdeartwork@1248132 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 262 insertions, 0 deletions

diff --git a/kscreensaver/krootbacking/krootbacking.cpp b/kscreensaver/krootbacking/krootbacking.cpp
new file mode 100644
index 00000000..4a4d5543
--- /dev/null
+++ b/kscreensaver/krootbacking/krootbacking.cpp
@@ -0,0 +1,262 @@
+/***************************************************************************
+ *   Copyright (C) 2011 by Timothy Pearson <kb9vqf@pearsoncomputing.net>   *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
+ ***************************************************************************/
+
+#include <tqwidget.h>
+#include <tqtimer.h>
+#include <tqrect.h>
+#include <tqimage.h>
+
+#include <kapplication.h>
+#include <kimageeffect.h>
+#include <kpixmapio.h>
+#include <kwinmodule.h>
+#include <kwin.h>
+#include <kdebug.h>
+#include <netwm.h>
+#include <dcopclient.h>
+#include <dcopref.h>
+
+#include <ksharedpixmap.h>
+#include <kstandarddirs.h>
+#include <krootbacking.h>
+
+static TQString wallpaperForDesktop(int desktop)
+{
+    return DCOPRef("kdesktop", "KBackgroundIface").call("currentWallpaper", desktop);
+}
+
+class KRootBackingData
+{
+public:
+    TQWidget *toplevel;
+#ifdef Q_WS_X11
+    KWinModule *kwin;
+#endif
+};
+
+
+KRootBacking::KRootBacking()
+    : TQObject(KApplication::desktop(), "KRootBacking" ), m_Desk(0), m_timeout(0)
+{
+    init();
+}
+
+void KRootBacking::init()
+{
+    d = new KRootBackingData;
+    m_Fade = 0;
+    m_pPixmap = new KSharedPixmap; //ordinary KPixmap on win32
+    m_pTimer = new TQTimer( this );
+    m_bInit = false;
+    m_bActive = false;
+
+    connect(kapp, TQT_SIGNAL(backgroundChanged(int)), TQT_SLOT(slotBackgroundChanged(int)));
+    connect(m_pTimer, TQT_SIGNAL(timeout()), TQT_SLOT(tqrepaint()));
+#ifdef Q_WS_X11
+    connect(m_pPixmap, TQT_SIGNAL(done(bool)), TQT_SLOT(slotDone(bool)));
+
+    d->kwin = new KWinModule( this );
+#endif
+
+    m_bInit = true;
+}
+
+KRootBacking::~KRootBacking()
+{
+    delete m_pPixmap;
+    delete d;
+}
+
+
+int KRootBacking::currentDesktop() const
+{
+#ifdef Q_WS_X11
+    NETRootInfo rinfo( qt_xdisplay(), NET::CurrentDesktop );
+    rinfo.activate();
+    return rinfo.currentDesktop();
+#endif
+}
+
+
+void KRootBacking::start()
+{
+    if (m_bActive)
+	return;
+
+    m_bActive = true;
+    if ( !isAvailable() )
+    {
+	// We should get a KIPC message when the shared pixmap is available...
+	enableExports();
+	if (m_timeout < 50) {
+		TQTimer::singleShot( 100, this, SLOT(show()) );	// ...but it doesn't always work!
+		m_timeout++;
+		return;
+	}
+    }
+    if (m_bInit) {
+	tqrepaint(true);
+    }
+}
+
+
+void KRootBacking::stop()
+{
+    m_bActive = false;
+    m_pTimer->stop();
+}
+
+
+void KRootBacking::setFadeEffect(double fade, const TQColor &color)
+{
+    if (fade < 0)
+	m_Fade = 0;
+    else if (fade > 1)
+	m_Fade = 1;
+    else
+	m_Fade = fade;
+    m_FadeColor = color;
+
+    if ( m_bActive && m_bInit ) tqrepaint(true);
+}
+
+void KRootBacking::tqrepaint()
+{
+    tqrepaint(false);
+}
+
+
+void KRootBacking::tqrepaint(bool force)
+{
+    TQWidget* desktopWidget = KApplication::desktop();
+    TQPoint p1 = desktopWidget->mapToGlobal(desktopWidget->rect().topLeft());
+    TQPoint p2 = desktopWidget->mapToGlobal(desktopWidget->rect().bottomRight());
+    if (!force && (m_Rect == TQRect(p1, p2)))
+	return;
+
+    m_Rect = TQRect(p1, p2);
+#ifdef Q_WS_X11
+    m_Desk = currentDesktop();
+
+    // KSharedPixmap will correctly generate a tile for us.
+    m_pPixmap->loadFromShared(pixmapName(m_Desk), m_Rect);
+#else
+    m_Desk = currentDesktop();
+    // !x11 note: tile is not generated!
+    // TODO: pixmapName() is a nonsense now!
+    m_pPixmap->load( pixmapName(m_Desk) );
+    if (!m_pPixmap->isNull()) {
+        m_pPixmap->resize( m_Rect.size() );
+        slotDone(true);
+    }
+#endif
+}
+
+bool KRootBacking::isAvailable() const
+{
+// #ifdef Q_WS_X11
+//     return m_pPixmap->isAvailable(pixmapName(m_Desk));
+// #else
+    return m_pPixmap->isNull();
+// #endif
+}
+
+TQString KRootBacking::pixmapName(int desk) {
+    TQString pattern = TQString("DESKTOP%1");
+#ifdef Q_WS_X11
+    int screen_number = DefaultScreen(qt_xdisplay());
+    if (screen_number) {
+        pattern = TQString("SCREEN%1-DESKTOP").arg(screen_number) + "%1";
+    }
+#endif
+    return pattern.arg( desk );
+}
+
+
+void KRootBacking::enableExports()
+{
+#ifdef Q_WS_X11
+    kdDebug(270) << k_lineinfo << "activating background exports.\n";
+    DCOPClient *client = kapp->dcopClient();
+    if (!client->isAttached())
+	client->attach();
+    TQByteArray data;
+    TQDataStream args( data, IO_WriteOnly );
+    args << 1;
+
+    TQCString appname( "kdesktop" );
+    int screen_number = DefaultScreen(qt_xdisplay());
+    if ( screen_number )
+        appname.sprintf("kdesktop-screen-%d", screen_number );
+
+    client->send( appname, "KBackgroundIface", "setExport(int)", data );
+#endif
+}
+
+
+void KRootBacking::slotDone(bool success)
+{
+    if (!success)
+    {
+	kdWarning(270) << k_lineinfo << "loading of desktop background failed.\n";
+	if (m_timeout < 50) {
+		TQTimer::singleShot( 100, this, SLOT(show()) );
+		m_timeout++;
+		return;
+	}
+    }
+
+    // We need to test active as the pixmap might become available
+    // after the widget has been destroyed.
+    if ( m_bActive )
+	updateBackground( m_pPixmap );
+}
+
+void KRootBacking::updateBackground( KSharedPixmap *spm )
+{
+    TQPixmap pm = *spm;
+
+    if (m_Fade > 1e-6)
+    {
+	KPixmapIO io;
+	TQImage img = io.convertToImage(pm);
+	img = KImageEffect::fade(img, m_Fade, m_FadeColor);
+	pm = io.convertToPixmap(img);
+    }
+
+    TQString filename = getenv("USER");
+    filename.prepend("/tmp/kde-");
+    filename.append("/krootbacking.png");
+    pm.save(filename, "PNG");
+    printf("%s\n\r", filename.ascii()); fflush(stdout);
+    exit(0);
+}
+
+
+void KRootBacking::slotBackgroundChanged(int desk)
+{
+    if (!m_bInit || !m_bActive)
+	return;
+
+    if (desk == m_Desk)
+	tqrepaint(true);
+}
+
+// #include "krootpixmap.moc"
+