Fix lack of system tray icon transparency when parent application utilizes ARGB visuals

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1249526 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

kdeui/ksystemtray.cpp

@@ -39,6 +39,7 @@
 #include <kconfig.h>
 
 #include <tqapplication.h>
+#include <tqbitmap.h>
 
 class KSystemTrayPrivate
 {
@@ -326,12 +327,37 @@ TQPixmap KSystemTray::loadSizedIcon( const TQString &icon, int iconWidth, KInsta
 
 void KSystemTray::setPixmap( const TQPixmap& p )
 {
-    TQPixmap iconPixmapToSet = p;
-    if (TQPaintDevice::x11AppDepth() == 32) iconPixmapToSet.convertFromImage(KImageEffect::convertToPremultipliedAlpha( iconPixmapToSet.convertToImage() ));
-    if (TQPaintDevice::x11AppDepth() == 32) setBackgroundMode( NoBackground );
-    TQLabel::setPixmap( iconPixmapToSet );
+	TQPixmap iconPixmapToSet = p;
+	if (TQPaintDevice::x11AppDepth() == 32) {
+		// Since full ARGB visuals are in use, we must handle the three primary data
+		// channel types (color, alpha, and mask) separately.
+		// First, make the actual color and internal alpha of the icon is correct
+		TQImage correctedImage = KImageEffect::convertToPremultipliedAlpha( iconPixmapToSet.convertToImage() );
+		iconPixmapToSet.convertFromImage(correctedImage);
+		// Next, handle the mask channel to make sure that the transparent
+		// sections remain transparent when drawn on the screen
+		TQBitmap maskBitmap;
+		// Generate the mask utilizing ONLY the pixels that are fully opaque
+		TQImage newMaskImage = correctedImage;
+		int w = newMaskImage.width();
+		int h = newMaskImage.height();
+		for (int y = 0; y < h; ++y) {
+			TQRgb *ls = (TQRgb *)newMaskImage.scanLine( y );
+			for (int x = 0; x < w; ++x) {
+				TQRgb l = ls[x];
+				int r = int( tqRed( l ) );
+				int g = int( tqGreen( l ) );
+				int b = int( tqBlue( l ) );
+				int a = int( (tqAlpha( l ) == 255) ? 255 : 0 );
+				ls[x] = tqRgba( r, g, b, a );
+			}
+		}
+		maskBitmap.convertFromImage(newMaskImage.createAlphaMask());
+		setMask(maskBitmap);
+	}
+	TQLabel::setPixmap( iconPixmapToSet );
 #ifdef Q_WS_X11
-    KWin::setIcons( winId(), iconPixmapToSet, TQPixmap());
+	KWin::setIcons( winId(), iconPixmapToSet, TQPixmap());
 #endif
 }