Enhance Amarok OSD in ARGB mode

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/amarok@1249948 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

amarok/src/osd.cpp

@@ -36,6 +36,9 @@
 #include <tqtimer.h>
 #include <tqvaluevector.h>
 
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
 namespace ShadowEngine
 {
     TQImage makeShadow( const TQPixmap &textPixmap, const TQColor &bgColor );
@@ -314,6 +317,16 @@ OSDWidget::render( const uint M, const TQSize &size )
         KPixmapEffect::fade( background, 0.80, backgroundColor() );
         p.drawPixmap( 0, 0, background );
     }
+    else if (( m_translucency ) && (kapp->isX11CompositionAvailable()))
+    {
+        // Make the background semi-transparent
+        TQPixmap background( m_screenshot.width(), m_screenshot.height(), 32 );
+        TQRgb blend_color = tqRgba(backgroundColor().red(), backgroundColor().green(), backgroundColor().blue(), 204);	// RGBA
+        float alpha = tqAlpha(blend_color) / 255.0;
+        int pixel = tqAlpha(blend_color) << 24 | int(tqRed(blend_color) * alpha) << 16 | int(tqGreen(blend_color) * alpha) << 8  | int(tqBlue(blend_color) * alpha);
+        background.fill(TQColor(blend_color, pixel));
+        bitBlt( &m_buffer, 0, 0, &background );
+    }
     else
         p.fillRect( rect, backgroundColor() );
 
@@ -392,6 +405,16 @@ OSDWidget::render( const uint M, const TQSize &size )
             KPixmapEffect::fade( background, 0.80, backgroundColor() );
             bitBlt( &vol, -r.left(), -r.top(), &background );
         }
+        else if (( m_translucency ) && (kapp->isX11CompositionAvailable()))
+        {
+            // Make the background semi-transparent
+            TQPixmap background( m_screenshot.width(), m_screenshot.height(), 32 );
+            TQRgb blend_color = tqRgba(backgroundColor().red(), backgroundColor().green(), backgroundColor().blue(), 204);	// RGBA
+            float alpha = tqAlpha(blend_color) / 255.0;
+            int pixel = tqAlpha(blend_color) << 24 | int(tqRed(blend_color) * alpha) << 16 | int(tqGreen(blend_color) * alpha) << 8  | int(tqBlue(blend_color) * alpha);
+            background.fill(TQColor(blend_color, pixel));
+            bitBlt( &vol, -r.left(), -r.top(), &background );
+        }
         else
             vol.fill( backgroundColor() );
 
@@ -496,23 +519,27 @@ OSDWidget::paintMe()
         blendedImage = blendedImage.convertDepth(32);
         blendedImage.setAlphaBuffer(true);
 
+	// Convert the ARGB pixmap to an ARGB image
+	// NOTE 1: TQPixmap::convertToImage() always converts an ARGB pixmap into an RGB image
+	// NOTE 2: This should eventually make its way into kdelibs or Qt itself,
+	// as it would also be useful in applications other than Amarok
 	int w = blendedImage.width();
 	int h = blendedImage.height();
-
+	Pixmap rawpixmap = m_buffer.handle();
+	XImage *image;
+	image = XGetImage (qt_xdisplay(), rawpixmap, 0, 0, w, h, AllPlanes, XYPixmap);
 	for (int y = 0; y < h; ++y) {
 		TQRgb *ls = (TQRgb *)blendedImage.scanLine( y );
 		for (int x = 0; x < w; ++x) {
-			TQRgb l = ls[x];
-			//int desired_alpha = 127;
-			int desired_alpha = 204;
-			float alpha_adjust = (desired_alpha/256.0);
-			int r = int( tqRed( l ) * alpha_adjust );
-			int g = int( tqGreen( l ) * alpha_adjust );
-			int b = int( tqBlue( l ) * alpha_adjust );
-			int a = int( desired_alpha );
+			unsigned int rawpixel = XGetPixel(image, x, y);
+			int r = int( (rawpixel & 0x00ff0000) >> 16 );
+			int g = int( (rawpixel & 0x0000ff00) >> 8 );
+			int b = int( (rawpixel & 0x000000ff) );
+			int a = int( (rawpixel & 0xff000000) >> 24 );
 			ls[x] = tqRgba( r, g, b, a );
 		}
 	}
+	XFree (image);
 
 	// Finally, paint it
 	TQPainter p1;