*** Bug 127444 has been marked as a duplicate of this bug. ***

What X11 driver do you use? 

We have had problems with tiled painting in nvidia chipset (because we unlike everyone else use the tiled painting call, rather than tiling ourself).

I'm using radeon xorg driver (9200 chipset) and I see that gibberish.

Created an attachment (id=16171) [details]
Disable pretiling.

Yeah. Turned out to be our pre-tiling that breaks. Disabling fixes the bug

Okay.. replacing copyBlt by bitBlt fixes the bug. The question is if copyBlt is
broken in Qt 3.3

bitBlt is wrong for images with alpha, you -need- to use copyBlt for them

SVN commit 543129 by carewolf:

Make sure copyBlt doesn't fail because of different depth.
BUG:127189


 M  +8 -7      loader.cpp  


--- branches/KDE/3.5/kdelibs/khtml/misc/loader.cpp #543128:543129
@@ -489,7 +489,6 @@
 #define BGMINWIDTH      32
 #define BGMINHEIGHT     32
 
-
 const QPixmap &CachedImage::tiled_pixmap(const QColor& newc)
 {
     static QRgb bgTransparent = qRgba( 0, 0, 0, 0xFF );
@@ -511,11 +510,12 @@
     QSize s(pixmap_size());
     int w = r.width();
     int h = r.height();
+    assert(s.width() == r.width() && s.height() == s.height());
 
     const QPixmap* src; //source for pretiling, if any
     //See whether we can - and should - pre-blend
     if (isvalid && (r.hasAlphaChannel() || r.mask() )) {
-        bg = new QPixmap(w, h);
+        bg = new QPixmap(w, h, r.depth());
         bg->fill(newc);
         bitBlt(bg, 0, 0, &r);
         bgColor = newc.rgb();
@@ -529,15 +529,16 @@
     if ( w*h < 8192 )
     {
         if ( r.width() < BGMINWIDTH )
-            w = ((BGMINWIDTH  / s.width())+1) * s.width();
+            w = ((BGMINWIDTH-1) / s.width() + 1) * s.width();
         if ( r.height() < BGMINHEIGHT )
-            h = ((BGMINHEIGHT / s.height())+1) * s.height();
+            h = ((BGMINHEIGHT-1) / s.height() + 1) * s.height();
     }
-
     if ( w != r.width() || h != r.height() )
     {
-	QPixmap* oldbg = bg;
-        bg = new QPixmap(w, h);
+//         kdDebug() << "pre-tiling " << s.width() << "," << s.height() << " to " << w << "," << h << endl;
+        QPixmap* oldbg = bg;
+        bg = new QPixmap(w, h, r.depth());
+
         //Tile horizontally on the first stripe
         for (int x = 0; x < w; x += r.width())
             copyBlt(bg, x, 0, src, 0, 0, r.width(), r.height());