Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 1359 insertions, 0 deletions

diff --git a/kcontrol/background/bgrender.cpp b/kcontrol/background/bgrender.cpp
new file mode 100644
index 000000000..f17892dce
--- /dev/null
+++ b/kcontrol/background/bgrender.cpp
@@ -0,0 +1,1359 @@
+/* vi: ts=8 sts=4 sw=4
+ * kate: space-indent on; tab-width 8; indent-width 4; indent-mode cstyle;
+ *
+ * This file is part of the KDE project, module kdesktop.
+ * Copyright (C) 1999 Geert Jansen <[email protected]>
+ *
+ * You can Freely distribute this program under the GNU Library General
+ * Public License. See the file "COPYING.LIB" for the exact licensing terms.
+ */
+
+#include <config.h>
+
+#include <time.h>
+#include <stdlib.h>
+#include <utime.h>
+
+#include <qtimer.h>
+#include <qpainter.h>
+#include <qimage.h>
+#include <qfileinfo.h>
+#include <qdir.h>
+
+#include <dcopclient.h>
+#include <kapplication.h>
+#include <kdebug.h>
+#include <kstandarddirs.h>
+#include <kimageeffect.h>
+#include <kprocess.h>
+#include <kpixmapio.h>
+#include <ktempfile.h>
+#include <kcursor.h>
+#include <kmimetype.h>
+#include <kfilemetainfo.h>
+
+#ifdef HAVE_LIBART
+#include <ksvgiconengine.h>
+#endif
+
+#include "bgdefaults.h"
+#include "bghash.h"
+#include "bgrender.h"
+
+#include <X11/Xlib.h>
+
+#include <config.h>
+
+/**** KBackgroundRenderer ****/
+
+
+KBackgroundRenderer::KBackgroundRenderer(int desk, int screen, bool drawBackgroundPerScreen, KConfig *config)
+    : KBackgroundSettings(desk, screen, drawBackgroundPerScreen, config)
+{
+    m_State = 0;
+    m_isBusyCursor = false;
+    m_enableBusyCursor = false;
+    m_pDirs = KGlobal::dirs();
+    m_rSize = m_Size = drawBackgroundPerScreen ?
+            QApplication::desktop()->screenGeometry(screen).size() : QApplication::desktop()->size();
+    m_pProc = 0L;
+    m_Tempfile = 0L;
+    m_bPreview = false;
+    m_Cached = false;
+    m_TilingEnabled = false;
+
+    m_pTimer = new QTimer(this);
+    connect(m_pTimer, SIGNAL(timeout()), SLOT(render()));
+}
+
+
+KBackgroundRenderer::~KBackgroundRenderer()
+{
+    cleanup();
+    delete m_Tempfile;
+    m_Tempfile = 0;
+}
+
+
+void KBackgroundRenderer::setSize(const QSize &size)
+{
+    m_rSize = m_Size = size;
+}
+
+/*
+ * Re-configure because the desktop has been resized.
+ */
+void KBackgroundRenderer::desktopResized()
+{
+    m_State = 0;
+    m_rSize = drawBackgroundPerScreen() ?
+            QApplication::desktop()->screenGeometry(screen()).size() : QApplication::desktop()->size();
+    if( !m_bPreview )
+        m_Size = m_rSize;
+}
+
+
+void KBackgroundRenderer::tile(QImage& dest, QRect rect, const QImage& src)
+{
+    rect &= dest.rect();
+
+    int x, y;
+    int h = rect.height(), w = rect.width();
+    int offx = rect.x(), offy = rect.y();
+    int sw = src.width(), sh = src.height();
+
+    for (y=offy; y<offy+h; y++)
+	for (x=offx; x<offx+w; x++)
+	    dest.setPixel(x, y, src.pixel(x%sw, y%sh));
+}
+
+
+/*
+ * Build a command line to run the program.
+ */
+
+QString KBackgroundRenderer::buildCommand()
+{
+    QString num;
+    int pos = 0;
+
+    QString cmd;
+    if (m_bPreview)
+        cmd = previewCommand();
+    else
+        cmd = command();
+
+    if (cmd.isEmpty())
+	return QString();
+
+    while ((pos = cmd.find('%', pos)) != -1) {
+
+        if (pos == (int) (cmd.length() - 1))
+            break;
+
+        switch (cmd.at(pos+1).latin1()) {
+        case 'f':
+            createTempFile();
+            cmd.replace(pos, 2, KShellProcess::quote(m_Tempfile->name()));
+            pos += m_Tempfile->name().length() - 2;
+            break;
+
+        case 'x':
+            num.setNum(m_Size.width());
+            cmd.replace(pos, 2, num);
+            pos += num.length() - 2;
+            break;
+
+        case 'y':
+            num.setNum(m_Size.height());
+            cmd.replace(pos, 2, num);
+            pos += num.length() - 2;
+            break;
+
+        case '%':
+            cmd.replace(pos, 2, "%");
+            pos--;
+            break;
+        default:
+            ++pos; // avoid infinite loop
+            break;
+        }
+
+    }
+    return cmd;
+}
+
+
+/*
+ * Create a background tile. If the background mode is `Program',
+ * this is asynchronous.
+ */
+int KBackgroundRenderer::doBackground(bool quit)
+{
+    if (m_State & BackgroundDone)
+        return Done;
+    int bgmode = backgroundMode();
+
+    if (!enabled())
+      bgmode= Flat;
+
+    if (quit) {
+	if (bgmode == Program && m_pProc)
+	    m_pProc->kill();
+        return Done;
+    }
+
+    int retval = Done;
+    QString file;
+
+    static unsigned int tileWidth = 0;
+    static unsigned int tileHeight = 0;
+    if( tileWidth == 0 )
+        {
+        int tile_val = QPixmap::defaultDepth() >= 24 ? 1 : 2;
+    // some dithering may be needed even with bpb==15/16, so don't use tileWidth==1
+    // for them
+    // with tileWidth>2, repainting the desktop causes nasty effect (XFree86 4.1.0 )
+        if( XQueryBestTile( qt_xdisplay(), qt_xrootwin(), tile_val, tile_val,
+            &tileWidth, &tileHeight ) != Success )
+            tileWidth = tileHeight = tile_val; // some defaults
+    }
+    switch (bgmode) {
+
+    case Flat:
+        // this can be tiled correctly without problems
+	m_Background.create( tileWidth, tileHeight, 32);
+        m_Background.fill(colorA().rgb());
+        break;
+
+    case Pattern:
+    {
+        if (pattern().isEmpty())
+            break;
+        file = m_pDirs->findResource("dtop_pattern", pattern());
+        if (file.isEmpty())
+            break;
+
+	m_Background.load(file);
+	if (m_Background.isNull())
+	    break;
+	int w = m_Background.width();
+	int h = m_Background.height();
+	if ((w > m_Size.width()) || (h > m_Size.height())) {
+	    w = QMIN(w, m_Size.width());
+	    h = QMIN(h, m_Size.height());
+	    m_Background = m_Background.copy(0, 0, w, h);
+	}
+	KImageEffect::flatten(m_Background, colorA(), colorB(), 0);
+	break;
+    }
+    case Program:
+        if (m_State & BackgroundStarted)
+            break;
+        m_State |= BackgroundStarted;
+        createTempFile();
+
+	file = buildCommand();
+	if (file.isEmpty())
+	    break;
+
+        delete m_pProc;
+        m_pProc = new KShellProcess;
+        *m_pProc << file;
+        connect(m_pProc, SIGNAL(processExited(KProcess *)),
+                SLOT(slotBackgroundDone(KProcess *)));
+        m_pProc->start(KShellProcess::NotifyOnExit);
+        retval = Wait;
+        break;
+
+    case HorizontalGradient:
+    {
+	QSize size = m_Size;
+        // on <16bpp displays the gradient sucks when tiled because of dithering
+        if( canTile())
+	    size.setHeight( tileHeight );
+	m_Background = KImageEffect::gradient(size, colorA(), colorB(),
+		KImageEffect::HorizontalGradient, 0);
+        break;
+    }
+    case VerticalGradient:
+    {
+	QSize size = m_Size;
+        // on <16bpp displays the gradient sucks when tiled because of dithering
+        if( canTile())
+	    size.setWidth( tileWidth );
+        m_Background = KImageEffect::gradient(size, colorA(), colorB(),
+		KImageEffect::VerticalGradient, 0);
+        break;
+    }
+    case PyramidGradient:
+        m_Background = KImageEffect::gradient(m_Size, colorA(), colorB(),
+		KImageEffect::PyramidGradient, 0);
+        break;
+
+    case PipeCrossGradient:
+        m_Background = KImageEffect::gradient(m_Size, colorA(), colorB(),
+		KImageEffect::PipeCrossGradient, 0);
+        break;
+
+    case EllipticGradient:
+        m_Background = KImageEffect::gradient(m_Size, colorA(), colorB(),
+		KImageEffect::EllipticGradient, 0);
+        break;
+    }
+
+    if (retval == Done)
+        m_State |= BackgroundDone;
+
+    return retval;
+}
+
+
+int KBackgroundRenderer::doWallpaper(bool quit)
+{
+    if (m_State & WallpaperDone)
+        return Done;
+
+    if (quit)
+        // currently no asynch. wallpapers
+        return Done;
+
+    int wpmode= enabled()?wallpaperMode():NoWallpaper;
+
+    m_Wallpaper = QImage();
+    if (wpmode != NoWallpaper) {
+wp_load:
+	if (currentWallpaper().isEmpty()) {
+	    wpmode = NoWallpaper;
+	    goto wp_out;
+	}
+	QString file = m_pDirs->findResource("wallpaper", currentWallpaper());
+	if (file.isEmpty()) {
+	    wpmode = NoWallpaper;
+	    goto wp_out;
+	}
+
+        // _Don't_ use KMimeType, as it relies on ksycoca which we really
+        // don't want in krootimage (kdm context).
+        //if ( KMimeType::findByPath( file )->is( "image/svg+xml" ) ) {
+        if (file.endsWith(".svg") || file.endsWith(".svgz")) {
+#ifdef HAVE_LIBART
+	    // Special stuff for SVG icons
+	    KSVGIconEngine* svgEngine = new KSVGIconEngine();
+
+	    //FIXME
+	    //ksvgiconloader doesn't seem to let us find out the
+	    //ratio of width to height so for the most part we just
+	    //assume it's a square
+	    int svgWidth;
+	    int svgHeight;
+	    switch (wpmode)
+	    {
+	        case Centred:
+	        case CentredAutoFit:
+		    svgHeight = (int)(m_Size.height() * 0.8);
+		    svgWidth = svgHeight;
+	            break;
+	        case Tiled:
+	        case CenterTiled:
+		    svgHeight = (int)(m_Size.height() * 0.5);
+		    svgWidth = svgHeight;
+	            break;
+	        case Scaled:
+		    svgHeight = m_Size.height();
+		    svgWidth = m_Size.width();
+	            break;
+	        case CentredMaxpect:
+		case ScaleAndCrop:
+	        case TiledMaxpect:
+		    svgHeight = m_Size.height();
+		    svgWidth = svgHeight;
+	            break;
+	        case NoWallpaper:
+	        default:
+	            kdWarning() << k_funcinfo << "unknown diagram type" << endl;
+		    svgHeight = m_Size.height();
+		    svgWidth = svgHeight;
+		    break;
+	    }
+	    //FIXME hack due to strangeness with
+	    //background control modules
+	    if ( svgHeight < 200 ) {
+		svgHeight *= 6;
+	        svgWidth *= 6;
+	    }
+
+	    if (svgEngine->load(svgWidth, svgHeight, file )) {
+		QImage *image = svgEngine->image();
+		m_Wallpaper = *image;
+		delete image;
+	    } else {
+		kdWarning() << "failed to load SVG file " << file << endl;
+	    }
+
+	    delete svgEngine;
+#else //not libart
+	    kdWarning() << k_funcinfo
+			<< "tried to load SVG file but libart not installed" << endl;
+#endif
+	} else {
+	    m_Wallpaper.load(file);
+	}
+	if (m_Wallpaper.isNull()) {
+            if (discardCurrentWallpaper())
+               goto wp_load;
+	    wpmode = NoWallpaper;
+	    goto wp_out;
+	}
+	m_Wallpaper = m_Wallpaper.convertDepth(32, DiffuseAlphaDither);
+
+	// If we're previewing, scale the wallpaper down to make the preview
+	// look more like the real desktop.
+	if (m_bPreview) {
+	    int xs = m_Wallpaper.width() * m_Size.width() / m_rSize.width();
+	    int ys = m_Wallpaper.height() * m_Size.height() / m_rSize.height();
+	    if ((xs < 1) || (ys < 1))
+	    {
+	       xs = ys = 1;
+	    }
+	    if( m_Wallpaper.size() != QSize( xs, ys ))
+		m_Wallpaper = m_Wallpaper.smoothScale(xs, ys);
+	}
+
+	// HACK: Use KFileMetaInfo only when we're attached to DCOP.
+	// KFileMetaInfo needs ksycoca and so on, but this code is
+	// used also in krootimage (which in turn is used by kdm).
+	if( kapp->dcopClient()->isAttached()) {
+	    KFileMetaInfo metaInfo(file);
+	    if (metaInfo.isValid() && metaInfo.item("Orientation").isValid()) {
+		switch (metaInfo.item("Orientation").string().toInt()) {
+		    case 2:
+			// Flipped horizontally
+			m_Wallpaper = m_Wallpaper.mirror(true, false);
+			break;
+		    case 3:
+			// Rotated 180 degrees
+			m_Wallpaper = KImageEffect::rotate(m_Wallpaper, KImageEffect::Rotate180);
+			break;
+		    case 4:
+			// Flipped vertically
+			m_Wallpaper = m_Wallpaper.mirror(false, true);
+			break;
+		    case 5:
+			// Rotated 90 degrees & flipped horizontally
+			m_Wallpaper = KImageEffect::rotate(m_Wallpaper, KImageEffect::Rotate90).mirror(true, false);
+			break;
+		    case 6:
+			// Rotated 90 degrees
+			m_Wallpaper = KImageEffect::rotate(m_Wallpaper, KImageEffect::Rotate90);
+			break;
+		    case 7:
+			// Rotated 90 degrees & flipped vertically
+			m_Wallpaper = KImageEffect::rotate(m_Wallpaper, KImageEffect::Rotate90).mirror(false, true);
+			break;
+		    case 8:
+			// Rotated 270 degrees
+			m_Wallpaper = KImageEffect::rotate(m_Wallpaper, KImageEffect::Rotate270);
+			break;
+		    case 1:
+		    default:
+			// Normal or invalid orientation
+			break;
+		}
+	    }
+	}
+    }
+wp_out:
+
+    if (m_Background.isNull()) {
+	m_Background.create(8, 8, 32);
+	m_Background.fill(colorA().rgb());
+    }
+
+    int retval = Done;
+
+    int w = m_Size.width();	// desktop width/height
+    int h = m_Size.height();
+
+    int ww = m_Wallpaper.width();	// wallpaper width/height
+    int wh = m_Wallpaper.height();
+
+    m_WallpaperRect = QRect();	// to be filled destination rectangle; may exceed desktop!
+
+    switch (wpmode)
+    {
+	case NoWallpaper:
+	    break;
+	case Centred:
+	    m_WallpaperRect.setRect((w - ww) / 2, (h - wh) / 2, ww, wh);
+	    break;
+	case Tiled:
+	    m_WallpaperRect.setRect(0, 0, w, h);
+	    break;
+	case CenterTiled:
+	    m_WallpaperRect.setCoords(-ww + ((w - ww) / 2) % ww, -wh + ((h - wh) / 2) % wh, w-1, h-1);
+	    break;
+	case Scaled:
+	    ww = w;
+	    wh = h;
+	    if( m_WallpaperRect.size() != QSize( w, h ))
+		m_Wallpaper = m_Wallpaper.smoothScale( w, h );
+	    m_WallpaperRect.setRect(0, 0, w, h);
+	    break;
+        case CentredAutoFit:
+            if( ww <= w && wh <= h ) {
+    	        m_WallpaperRect.setRect((w - ww) / 2, (h - wh) / 2, ww, wh); // like Centred
+	        break;
+            }
+            // fall through
+	case CentredMaxpect:
+            {
+              double sx = (double) w / ww;
+              double sy = (double) h / wh;
+              if (sx > sy) {
+                  ww = (int)(sy * ww);
+                  wh = h;
+              } else {
+                  wh = (int)(sx * wh);
+                  ww = w;
+              }
+	      if( m_WallpaperRect.size() != QSize( ww, wh ))
+                  m_Wallpaper = m_Wallpaper.smoothScale(ww, wh);
+	      m_WallpaperRect.setRect((w - ww) / 2, (h - wh) / 2, ww, wh);
+	      break;
+            }
+	case TiledMaxpect:
+            {
+              double sx = (double) w / ww;
+              double sy = (double) h / wh;
+              if (sx > sy) {
+                  ww = (int)(sy * ww);
+                  wh = h;
+              } else {
+                  wh = (int)(sx * wh);
+                  ww = w;
+              }
+              if( m_WallpaperRect.size() != QSize( ww, wh ))
+                  m_Wallpaper = m_Wallpaper.smoothScale(ww, wh);
+	      m_WallpaperRect.setRect(0, 0, w, h);
+	      break;
+            }
+	 case ScaleAndCrop:
+            {
+              double sx = (double) w / ww;
+              double sy = (double) h / wh;
+              if (sx > sy) {
+	      	  //Case 1: x needs bigger scaling. Lets increase x and leave part of y offscreen
+                  ww = w;
+		  wh=(int)(sx * wh);
+              } else {
+	          //Case 2: y needs bigger scaling. Lets increase y and leave part of x offscreen
+                  wh = h;
+                  ww = (int)(sy*ww);
+              }
+              if( m_WallpaperRect.size() != QSize( ww, wh ))
+                  m_Wallpaper = m_Wallpaper.smoothScale(ww, wh);
+	      m_WallpaperRect.setRect((w - ww) / 2, (h - wh) / 2,w, h);
+	      break;
+            }
+    }
+
+    wallpaperBlend();
+
+    if (retval == Done)
+        m_State |= WallpaperDone;
+
+    return retval;
+}
+
+bool KBackgroundRenderer::canTile() const
+{
+    return m_TilingEnabled && optimize();
+}
+
+extern bool qt_use_xrender; // in Qt ( qapplication_x11.cpp )
+
+void KBackgroundRenderer::wallpaperBlend()
+{
+    if( !enabled() || wallpaperMode() == NoWallpaper
+        || (blendMode() == NoBlending && ( qt_use_xrender || !m_Wallpaper.hasAlphaBuffer()))) {
+        fastWallpaperBlend();
+    }
+    else {
+        fullWallpaperBlend();
+    }
+}
+
+// works only for NoBlending and no alpha in wallpaper
+// but is much faster than QImage fidling
+void KBackgroundRenderer::fastWallpaperBlend()
+{
+    m_Image = QImage();
+    // copy background to m_pPixmap
+    if( !enabled() || (wallpaperMode() == NoWallpaper && canTile())) {
+        // if there's no wallpaper, no need to tile the pixmap to the size of desktop, as X does
+        // that automatically and using a smaller pixmap should save some memory
+        m_Pixmap.convertFromImage( m_Background );
+        return;
+    }
+    else if( wallpaperMode() == Tiled && !m_Wallpaper.hasAlphaBuffer() && canTile() && !m_bPreview ) {
+    // tiles will be tiled by X automatically
+        if( useShm()) {
+            KPixmapIO io;
+            m_Pixmap = io.convertToPixmap( m_Wallpaper );
+        }
+        else
+            m_Pixmap.convertFromImage( m_Wallpaper );
+        return;
+    }
+    else if( m_WallpaperRect.contains( QRect( QPoint( 0, 0 ), m_Size ))
+        && !m_Wallpaper.hasAlphaBuffer()) // wallpaper covers all and no blending
+        m_Pixmap = QPixmap( m_Size );
+    else if (m_Background.size() == m_Size)
+        m_Pixmap.convertFromImage( m_Background );
+    else {
+        m_Pixmap = QPixmap( m_Size );
+        QPainter p( &m_Pixmap );
+        QPixmap pm;
+        pm.convertFromImage( m_Background );
+        p.drawTiledPixmap( 0, 0, m_Size.width(), m_Size.height(), pm );
+    }
+
+    // paint/alpha-blend wallpaper to destination rectangle of m_pPixmap
+    if (m_WallpaperRect.isValid()) {
+        QPixmap wp_pixmap;
+        if( useShm() && !m_Wallpaper.hasAlphaBuffer()) {
+            KPixmapIO io;
+            wp_pixmap = io.convertToPixmap( m_Wallpaper );
+        }
+        else
+            wp_pixmap.convertFromImage( m_Wallpaper );
+        int ww = m_Wallpaper.width();
+        int wh = m_Wallpaper.height();
+        for (int y = m_WallpaperRect.top(); y < m_WallpaperRect.bottom(); y += wh) {
+	    for (int x = m_WallpaperRect.left(); x < m_WallpaperRect.right(); x += ww) {
+		bitBlt( &m_Pixmap, x, y, &wp_pixmap, 0, 0, ww, wh );
+	    }
+	}
+    }
+}
+
+
+void KBackgroundRenderer::fullWallpaperBlend()
+{
+    m_Pixmap = QPixmap();
+    int w = m_Size.width();	// desktop width/height
+    int h = m_Size.height();
+    // copy background to m_pImage
+    if (m_Background.size() == m_Size) {
+	m_Image = m_Background.copy();
+
+	if (m_Image.depth() < 32)
+	    m_Image = m_Image.convertDepth(32, DiffuseAlphaDither);
+
+    } else {
+	m_Image.create(w, h, 32);
+	tile(m_Image, QRect(0, 0, w, h), m_Background);
+    }
+
+    // blend wallpaper to destination rectangle of m_pImage
+    if (m_WallpaperRect.isValid())
+    {
+        int blendFactor = 100;
+        if (blendMode() == FlatBlending)
+            blendFactor = (blendBalance()+200)/4;
+        int ww = m_Wallpaper.width();
+        int wh = m_Wallpaper.height();
+        for (int y = m_WallpaperRect.top(); y < m_WallpaperRect.bottom(); y += wh) {
+	    for (int x = m_WallpaperRect.left(); x < m_WallpaperRect.right(); x += ww) {
+		blend(m_Image, QRect(x, y, ww, wh), m_Wallpaper,
+			QPoint(-QMIN(x, 0), -QMIN(y, 0)), blendFactor);
+	    }
+	}
+    }
+
+
+    // blend whole desktop
+    if ( wallpaperMode() != NoWallpaper) {
+      int bal = blendBalance();
+
+      switch( blendMode() ) {
+      case HorizontalBlending:
+	KImageEffect::blend( m_Image, m_Background,
+			     KImageEffect::HorizontalGradient,
+			     bal, 100 );
+	break;
+
+      case VerticalBlending:
+	KImageEffect::blend( m_Image, m_Background,
+			     KImageEffect::VerticalGradient,
+			     100, bal );
+	break;
+
+      case PyramidBlending:
+	KImageEffect::blend( m_Image, m_Background,
+			     KImageEffect::PyramidGradient,
+			     bal, bal );
+	break;
+
+      case PipeCrossBlending:
+	KImageEffect::blend( m_Image, m_Background,
+			     KImageEffect::PipeCrossGradient,
+			     bal, bal );
+	break;
+
+      case EllipticBlending:
+	KImageEffect::blend( m_Image, m_Background,
+			     KImageEffect::EllipticGradient,
+			     bal, bal );
+	break;
+
+      case IntensityBlending:
+	KImageEffect::modulate( m_Image, m_Background, reverseBlending(),
+		    KImageEffect::Intensity, bal, KImageEffect::All );
+	break;
+
+      case SaturateBlending:
+	KImageEffect::modulate( m_Image, m_Background, reverseBlending(),
+		    KImageEffect::Saturation, bal, KImageEffect::Gray );
+	break;
+
+      case ContrastBlending:
+	KImageEffect::modulate( m_Image, m_Background, reverseBlending(),
+		    KImageEffect::Contrast, bal, KImageEffect::All );
+	break;
+
+      case HueShiftBlending:
+	KImageEffect::modulate( m_Image, m_Background, reverseBlending(),
+		    KImageEffect::HueShift, bal, KImageEffect::Gray );
+	break;
+
+      case FlatBlending:
+        // Already handled
+	break;
+      }
+    }
+}
+
+/* Alpha blend an area from <src> with offset <soffs> to rectangle <dr> of <dst>
+ * Default offset is QPoint(0, 0).
+ * blendfactor = [0, 100%]
+ */
+void KBackgroundRenderer::blend(QImage& dst, QRect dr, const QImage& src, QPoint soffs, int blendFactor)
+{
+    int x, y, a;
+    dr &= dst.rect();
+
+    for (y = 0; y < dr.height(); y++) {
+	if (dst.scanLine(dr.y() + y) && src.scanLine(soffs.y() + y)) {
+	    QRgb *b, *d;
+	    for (x = 0; x < dr.width(); x++) {
+		b = reinterpret_cast<QRgb*>(dst.scanLine(dr.y() + y)
+			+ (dr.x() + x) * sizeof(QRgb));
+                d = reinterpret_cast<QRgb*>(src.scanLine(soffs.y() + y)
+			+ (soffs.x() + x) * sizeof(QRgb));
+                a = (qAlpha(*d) * blendFactor) / 100;
+                *b = qRgb(qRed(*b) - (((qRed(*b) - qRed(*d)) * a) >> 8),
+                          qGreen(*b) - (((qGreen(*b) - qGreen(*d)) * a) >> 8),
+                          qBlue(*b) - (((qBlue(*b) - qBlue(*d)) * a) >> 8));
+            }
+        }
+    }
+}
+
+
+
+void KBackgroundRenderer::slotBackgroundDone(KProcess *process)
+{
+    Q_ASSERT(process == m_pProc);
+    m_State |= BackgroundDone;
+
+    if (m_pProc->normalExit() && !m_pProc->exitStatus()) {
+        m_Background.load(m_Tempfile->name());
+        m_State |= BackgroundDone;
+    }
+
+    m_Tempfile->unlink();
+    delete m_Tempfile; m_Tempfile = 0;
+    m_pTimer->start(0, true);
+    setBusyCursor(false);
+}
+
+
+
+/*
+ * Starts the rendering process.
+ */
+void KBackgroundRenderer::start(bool enableBusyCursor)
+{
+    m_enableBusyCursor = enableBusyCursor;
+    setBusyCursor(true);
+
+    m_Cached = false;
+
+    m_State = Rendering;
+    m_pTimer->start(0, true);
+}
+
+
+/*
+ * This slot is connected to a timer event. It is called repeatedly until
+ * the rendering is done.
+ */
+void KBackgroundRenderer::render()
+{
+    setBusyCursor(true);
+    if (!(m_State & Rendering))
+        return;
+
+    if( !(m_State & InitCheck)) {
+        QString f = cacheFileName();
+        if( useCacheFile()) {
+            QString w = m_pDirs->findResource("wallpaper", currentWallpaper());
+            QFileInfo wi( w );
+            QFileInfo fi( f );
+            if( wi.lastModified().isValid() && fi.lastModified().isValid()
+                && wi.lastModified() < fi.lastModified()) {
+                QImage im;
+                if( im.load( f, "PNG" )) {
+                    m_Image = im;
+                    m_Pixmap = QPixmap( m_Size );
+                    m_Pixmap.convertFromImage( m_Image );
+                    m_Cached = true;
+                    m_State |= InitCheck | BackgroundDone | WallpaperDone;
+                }
+            }
+        }
+        m_pTimer->start(0, true);
+        m_State |= InitCheck;
+        return;
+    }
+
+    int ret;
+
+    if (!(m_State & BackgroundDone)) {
+        ret = doBackground();
+        if (ret != Wait)
+	    m_pTimer->start(0, true);
+	return;
+    }
+
+    // No async wallpaper
+    doWallpaper();
+
+    done();
+    setBusyCursor(false);
+}
+
+
+/*
+ * Rendering is finished.
+ */
+void KBackgroundRenderer::done()
+{
+    setBusyCursor(false);
+    m_State |= AllDone;
+    emit imageDone(desk(), screen());
+    if(backgroundMode() == Program && m_pProc &&
+       m_pProc->normalExit() && m_pProc->exitStatus()) {
+         emit programFailure(desk(), m_pProc->exitStatus());
+     } else if(backgroundMode() == Program && m_pProc &&
+       !m_pProc->normalExit()) {
+         emit programFailure(desk(), -1);
+     } else if(backgroundMode() == Program) {
+         emit programSuccess(desk());
+     }
+
+}
+
+/*
+ * This function toggles a busy cursor on and off, for use in rendering.
+ * It is useful because of the ASYNC nature of the rendering - it is hard
+ * to make sure we don't set the busy cursor twice, but only restore
+ * once.
+ */
+void KBackgroundRenderer::setBusyCursor(bool isBusy) {
+   if(m_isBusyCursor == isBusy)
+      return;
+   if (isBusy && !m_enableBusyCursor)
+      return;
+   m_isBusyCursor = isBusy;
+   if(isBusy)
+      QApplication::setOverrideCursor( KCursor::workingCursor() );
+   else
+      QApplication::restoreOverrideCursor();
+}
+
+/*
+ * Stop the rendering.
+ */
+void KBackgroundRenderer::stop()
+{
+    if (!(m_State & Rendering))
+	return;
+
+    doBackground(true);
+    doWallpaper(true);
+    m_State = 0;
+}
+
+
+/*
+ * Cleanup after rendering.
+ */
+void KBackgroundRenderer::cleanup()
+{
+    setBusyCursor(false);
+    m_Background = QImage();
+    m_Image = QImage();
+    m_Pixmap = QPixmap();
+    m_Wallpaper = QImage();
+    delete m_pProc; m_pProc = 0L;
+    m_State = 0;
+    m_WallpaperRect = QRect();
+    m_Cached = false;
+}
+
+
+void KBackgroundRenderer::setPreview(const QSize &size)
+{
+    if (size.isNull())
+        m_bPreview = false;
+    else {
+        m_bPreview = true;
+        m_Size = size;
+    }
+}
+
+
+QPixmap KBackgroundRenderer::pixmap()
+{
+    if (m_State & AllDone) {
+        if( m_Pixmap.isNull())
+            m_Pixmap.convertFromImage( m_Image );
+        return m_Pixmap;
+    }
+    return QPixmap();
+}
+
+QImage KBackgroundRenderer::image()
+{
+    if (m_State & AllDone) {
+        if( m_Image.isNull())
+            fullWallpaperBlend(); // create from m_Pixmap
+        return m_Image;
+    }
+    return QImage();
+}
+
+
+void KBackgroundRenderer::load(int desk, int screen, bool drawBackgroundPerScreen, bool reparseConfig)
+{
+    if (m_State & Rendering)
+        stop();
+
+    cleanup();
+    m_bPreview = false;
+    m_Size = m_rSize;
+
+    KBackgroundSettings::load(desk, screen, drawBackgroundPerScreen, reparseConfig);
+}
+
+void KBackgroundRenderer::createTempFile()
+{
+   if( !m_Tempfile )
+     m_Tempfile = new KTempFile();
+}
+
+QString KBackgroundRenderer::cacheFileName()
+{
+    QString f = fingerprint();
+    f.replace ( ':', '_' ); // avoid characters that shouldn't be in filenames
+    f.replace ( '/', '#' );
+    f = locateLocal( "cache", QString( "background/%1x%2_%3.png" )
+        .arg( m_Size.width()).arg( m_Size.height()).arg( f ));
+    return f;
+}
+
+bool KBackgroundRenderer::useCacheFile() const
+{
+    if( !enabled())
+        return false;
+    if( backgroundMode() == Program )
+        return false; // don't cache these at all
+    if( wallpaperMode() == NoWallpaper )
+        return false; // generating only background patterns should be always faster
+    QString file = currentWallpaper();
+    if( file.endsWith(".svg") || file.endsWith(".svgz"))
+        return true; // cache these, they can be bloody slow
+    switch( backgroundMode())
+        {
+        case NoWallpaper:
+        case Centred:
+        case Tiled:
+        case CenterTiled:
+            return false; // these don't need scaling
+        case CentredMaxpect:
+        case TiledMaxpect:
+        case Scaled:
+        case CentredAutoFit:
+        case ScaleAndCrop:
+        default:
+            return true;
+        }
+}
+
+void KBackgroundRenderer::saveCacheFile()
+{
+    if( !( m_State & AllDone ))
+        return;
+    if( !useCacheFile())
+        return;
+    if( m_Image.isNull())
+        fullWallpaperBlend(); // generate from m_Pixmap
+    QString f = cacheFileName();
+    if( KStandardDirs::exists( f ) || m_Cached )
+        utime( QFile::encodeName( f ), NULL );
+    else {
+        m_Image.save( f, "PNG" );
+        // remove old entries from the cache
+        QDir dir( locateLocal( "cache", "background/" ));
+        if( const QFileInfoList* list = dir.entryInfoList( "*.png", QDir::Files, QDir::Time | QDir::Reversed )) {
+            int size = 0;
+            for( QFileInfoListIterator it( *list );
+                 QFileInfo* info = it.current();
+                 ++it )
+                size += info->size();
+            for( QFileInfoListIterator it( *list );
+                 QFileInfo* info = it.current();
+                 ++it ) {
+                if( size < 8 * 1024 * 1024 )
+                    break;
+                // keep everything newer than 10 minutes if the total size is less than 50M (just in case)
+                if( size < 50 * 1024 * 1024
+                    && ( time_t ) info->lastModified().toTime_t() >= time( NULL ) - 10 * 60 )
+                    break;
+                size -= info->size();
+                QFile::remove( info->absFilePath());
+            }
+        }
+    }
+}
+
+//BEGIN class KVirtualBGRenderer
+KVirtualBGRenderer::KVirtualBGRenderer( int desk, KConfig *config )
+{
+    m_pPixmap = 0l;
+    m_desk = desk;
+    m_numRenderers = 0;
+    m_scaleX = 1;
+    m_scaleY = 1;
+    
+    // The following code is borrowed from KBackgroundSettings::KBackgroundSettings
+    if (!config) {
+        int screen_number = 0;
+        if (qt_xdisplay())
+            screen_number = DefaultScreen(qt_xdisplay());
+        QCString configname;
+        if (screen_number == 0)
+            configname = "kdesktoprc";
+        else
+            configname.sprintf("kdesktop-screen-%drc", screen_number);
+
+        m_pConfig = new KConfig(configname, false, false);
+        m_bDeleteConfig = true;
+    } else {
+        m_pConfig = config;
+        m_bDeleteConfig = false;
+    }
+    
+    initRenderers();
+    m_size = QApplication::desktop()->size();
+}
+
+KVirtualBGRenderer::~KVirtualBGRenderer()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        delete m_renderer[i];
+   
+    delete m_pPixmap;
+    
+    if (m_bDeleteConfig)
+        delete m_pConfig;
+}
+
+    
+KBackgroundRenderer * KVirtualBGRenderer::renderer(unsigned screen)
+{
+    return m_renderer[screen];
+}
+
+
+QPixmap KVirtualBGRenderer::pixmap()
+{
+    if (m_numRenderers == 1)
+        return m_renderer[0]->pixmap();
+    
+    return *m_pPixmap;
+}
+
+
+bool KVirtualBGRenderer::needProgramUpdate()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        if ( m_renderer[i]->backgroundMode() == KBackgroundSettings::Program &&
+             m_renderer[i]->KBackgroundProgram::needUpdate() )
+            return true;
+    }
+    return false;
+}
+
+
+void KVirtualBGRenderer::programUpdate()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        if ( m_renderer[i]->backgroundMode() == KBackgroundSettings::Program &&
+             m_renderer[i]->KBackgroundProgram::needUpdate() )
+        {
+            m_renderer[i]->KBackgroundProgram::update();
+        }
+    }
+}
+
+
+bool KVirtualBGRenderer::needWallpaperChange()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        if ( m_renderer[i]->needWallpaperChange() )
+            return true;
+    }
+    return false;
+}
+
+
+void KVirtualBGRenderer::changeWallpaper()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        m_renderer[i]->changeWallpaper();
+    }
+}
+
+
+int KVirtualBGRenderer::hash()
+{
+    QString fp;
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        fp += m_renderer[i]->fingerprint();
+    }
+    //kdDebug() << k_funcinfo << " fp=\""<<fp<<"\" h="<<QHash(fp)<<endl;
+    return QHash(fp);
+}
+
+
+bool KVirtualBGRenderer::isActive()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        if ( m_renderer[i]->isActive() )
+            return true;
+    }
+    return false;
+}
+
+
+void KVirtualBGRenderer::setEnabled(bool enable)
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        m_renderer[i]->setEnabled(enable);
+}
+
+
+void KVirtualBGRenderer::desktopResized()
+{
+    m_size = QApplication::desktop()->size();
+    
+    if (m_pPixmap)
+    {
+        delete m_pPixmap;
+        m_pPixmap = new QPixmap(m_size);
+        m_pPixmap->fill(Qt::black);
+    }
+
+    initRenderers();    
+}
+
+
+void KVirtualBGRenderer::setPreview(const QSize & size)
+{
+    if (m_size == size)
+        return;
+    
+    m_size = size;
+    
+    if (m_pPixmap)
+        m_pPixmap->resize(m_size);
+    
+    // Scaling factors
+    m_scaleX = float(m_size.width()) / float(QApplication::desktop()->size().width());
+    m_scaleY = float(m_size.height()) / float(QApplication::desktop()->size().height());
+    
+    // Scale renderers appropriately
+    for (unsigned i=0; i<m_renderer.size(); ++i)
+    {
+        QSize unscaledRendererSize = renderSize(i);
+        
+        m_renderer[i]->setPreview( QSize(
+                int(unscaledRendererSize.width() * m_scaleX),
+                int(unscaledRendererSize.height() * m_scaleY) ) );
+    }
+}
+
+
+QSize KVirtualBGRenderer::renderSize(int screen)
+{
+    return m_bDrawBackgroundPerScreen ?
+            QApplication::desktop()->screenGeometry(screen).size() : QApplication::desktop()->size();
+}
+
+
+void KVirtualBGRenderer::initRenderers()
+{
+    m_pConfig->setGroup("Background Common");
+    m_bDrawBackgroundPerScreen = m_pConfig->readBoolEntry( QString("DrawBackgroundPerScreen_%1").arg(m_desk), _defDrawBackgroundPerScreen );
+    
+    m_bCommonScreen = m_pConfig->readBoolEntry("CommonScreen", _defCommonScreen);
+    
+    m_numRenderers = m_bDrawBackgroundPerScreen ? QApplication::desktop()->numScreens() : 1;
+    
+    m_bFinished.resize(m_numRenderers);
+    m_bFinished.fill(false);
+    
+    if (m_numRenderers == m_renderer.size())
+        return;
+    
+    for (unsigned i=0; i<m_renderer.size(); ++i)
+        delete m_renderer[i];
+    
+    m_renderer.resize(m_numRenderers);
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        int eScreen = m_bCommonScreen ? 0 : i;
+        KBackgroundRenderer * r = new KBackgroundRenderer( m_desk, eScreen, m_bDrawBackgroundPerScreen, m_pConfig );
+        m_renderer.insert( i, r );
+        r->setSize(renderSize(i));
+        connect( r, SIGNAL(imageDone(int,int)), this, SLOT(screenDone(int,int)) );
+    }
+}
+
+
+void KVirtualBGRenderer::load(int desk, bool reparseConfig)
+{
+    m_desk = desk;
+    
+    m_pConfig->setGroup("Background Common");
+    m_bCommonScreen = m_pConfig->readBoolEntry("CommonScreen", _defCommonScreen);
+    
+    initRenderers();
+    
+    for (unsigned i=0; i<m_numRenderers; ++i)
+    {
+        unsigned eScreen = m_bCommonScreen ? 0 : i;
+        m_renderer[i]->load(desk, eScreen, m_bDrawBackgroundPerScreen, reparseConfig);
+    }
+}
+
+
+void KVirtualBGRenderer::screenDone(int _desk, int _screen)
+{
+    Q_UNUSED(_desk);
+    Q_UNUSED(_screen);
+    
+    const KBackgroundRenderer * sender = dynamic_cast<const KBackgroundRenderer*>(this->sender());
+    int screen = m_renderer.find(sender);
+    if (screen == -1)
+        //??
+        return;
+    
+    m_bFinished[screen] = true;
+    
+    
+    if (m_pPixmap)
+    {
+        // There's more than one renderer, so we are drawing each output to our own pixmap
+        
+        QRect overallGeometry;
+        for (int i=0; i < QApplication::desktop()->numScreens(); ++i)
+            overallGeometry |= QApplication::desktop()->screenGeometry(i);
+        
+        QPoint drawPos = QApplication::desktop()->screenGeometry(screen).topLeft() - overallGeometry.topLeft();
+        drawPos.setX( int(drawPos.x() * m_scaleX) );
+        drawPos.setY( int(drawPos.y() * m_scaleY) );
+        
+        QPixmap source = m_renderer[screen]->pixmap();
+        QSize renderSize = this->renderSize(screen);
+        renderSize.setWidth( int(renderSize.width() * m_scaleX) );
+        renderSize.setHeight( int(renderSize.height() * m_scaleY) );
+        
+        QPainter p(m_pPixmap);
+        
+        if (renderSize == source.size())
+            p.drawPixmap( drawPos, source );
+        
+        else
+            p.drawTiledPixmap( drawPos.x(), drawPos.y(), renderSize.width(), renderSize.height(), source );
+        
+        p.end();
+    }
+    
+    for (unsigned i=0; i<m_bFinished.size(); ++i)
+    {
+        if (!m_bFinished[i])
+            return;
+    }
+    
+    emit imageDone(m_desk);
+}
+
+
+void KVirtualBGRenderer::start()
+{
+    if (m_pPixmap)
+    {
+        delete m_pPixmap;
+        m_pPixmap = 0l;
+    }
+    
+    if (m_numRenderers > 1)
+    {
+        m_pPixmap = new QPixmap(m_size);
+        // If are screen sizes do not properly tile the overall virtual screen
+        // size, then we want the untiled parts to be black for use in desktop
+        // previews, etc
+        m_pPixmap->fill(Qt::black);
+    }
+    
+    m_bFinished.fill(false);
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        m_renderer[i]->start();
+}
+
+
+void KVirtualBGRenderer::stop()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        m_renderer[i]->stop();
+}
+
+
+void KVirtualBGRenderer::cleanup()
+{
+    m_bFinished.fill(false);
+    
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        m_renderer[i]->cleanup();
+    
+    delete m_pPixmap;
+    m_pPixmap = 0l;
+}
+
+void KVirtualBGRenderer::saveCacheFile()
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        m_renderer[i]->saveCacheFile();
+}
+
+void KVirtualBGRenderer::enableTiling( bool enable )
+{
+    for (unsigned i=0; i<m_numRenderers; ++i)
+        m_renderer[i]->enableTiling( enable );
+}
+
+//END class KVirtualBGRenderer
+
+
+#include "bgrender.moc"