[mistelix] Fixes issue #584493

[Jordi Mas <jmas src gnome org>]

commit c90356e6338593b44e197b80ab8589e0ca5dd322
Author: Jordi Mas <jmas softcatala org>
Date:   Wed Jun 24 20:07:07 2009 +0200

    Fixes issue #584493

 src/datamodel/ProjectDetails.cs |    4 ++--
 src/widgets/GtkUtils.cs         |   13 ++++++++++---
 2 files changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/src/datamodel/ProjectDetails.cs b/src/datamodel/ProjectDetails.cs
index b15371f..aba1017 100644
--- a/src/datamodel/ProjectDetails.cs
+++ b/src/datamodel/ProjectDetails.cs
@@ -65,11 +65,11 @@ namespace Mistelix.DataModel
 		public ProjectDetails () 
 		{
 			buttons_back_color = new Cairo.Color (44d / 255d, 56d / 255d, 119d / 255d, 0.5);
-			buttons_fore_color = new Cairo.Color (1, 1, 1, 255);
+			buttons_fore_color = new Cairo.Color (1, 1, 1, 1);
 			buttons_fontname = "sans 12";
 
 			slideshows_back_color = new Cairo.Color (44d / 255d, 56d / 255d, 119d / 255d, 0.5);
-			slideshows_fore_color = new Cairo.Color (1, 1, 1, 255);
+			slideshows_fore_color = new Cairo.Color (1, 1, 1, 1);
 			slideshows_fontname = "sans 12";
 		}
 
diff --git a/src/widgets/GtkUtils.cs b/src/widgets/GtkUtils.cs
index 4af1202..1593ae2 100644
--- a/src/widgets/GtkUtils.cs
+++ b/src/widgets/GtkUtils.cs
@@ -45,9 +45,10 @@ namespace Mistelix.Widgets
 			cr.Restore ();
 		}
 
-		public static Cairo.Color GdkToCairoColor (Gdk.Color color, int alpha)
+		public static Cairo.Color GdkToCairoColor (Gdk.Color color, int a)
 		{
-			return new Cairo.Color (color.Red / 65535.0, color.Green / 65535.0, color.Blue / 65535.0, alpha / 65535.0);
+			double alpha = a / 65535.0;
+			return new Cairo.Color ((color.Red / 65535.0) * alpha, (color.Green / 65535.0) * alpha, (color.Blue / 65535.0) * alpha, alpha);
 		}
 
 		public static Cairo.Color GdkToCairoColor (Gdk.Color color)
@@ -57,7 +58,13 @@ namespace Mistelix.Widgets
 
 		public static Gdk.Color CairoToGdkColor (Cairo.Color color)
 		{
-			return new Gdk.Color ((byte) (color.R * 65535), (byte) (color.G * 65535), (byte) (color.B * 65535));
+			double r, g, b;
+
+			r = (color.R * 255.0) / color.A;
+			g = (color.G * 255.0) / color.A;
+			b = (color.B * 255.0) / color.A;
+
+			return new Gdk.Color ((byte)r, (byte)g, (byte)b);
 		}
 	}
 }