Attachment 241788 Details for Bug 426370

Test case exposing the opacity/alpha channel bug

checker-bug.cs (text/plain), 1.74 KB, created by Aaron Bockover on 2008-09-25 21:22:27 UTC

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Creator: Aaron Bockover

Created: 2008-09-25 21:22:27 UTC

Size: 1.74 KB

patch

obsolete

>// Compile:  gmcs -r:Mono.Cairo -pkg:gtk-sharp-2.0 checker-bug.cs
>// Run:      mono checker-bug.exe
>
>using System;
>using Gtk;
>using Cairo;
>
>class CheckerBugWindow : Window
>{
>    static void Main ()
>    {
>        Application.Init ();
>        
>        var win = new CheckerBugWindow {
>            BorderWidth = 10,
>            WindowPosition = WindowPosition.Center,
>        };
>
>        win.SetDefaultSize (500, 400);
>        win.DeleteEvent += (o, e) => Application.Quit ();
>        win.ShowAll ();
>
>        Application.Run ();
>    }
>
>    public CheckerBugWindow () : base ("Checker Bug Test")
>    {
>        var vbox = new VBox { Spacing = 10 };
>        var hbox = new HBox { Spacing = 5 };
>        var bug = new CheckerBugDrawing ();
>        var opacity_entry = new SpinButton (0, 1, 0.01) { Value = bug.Opacity };
>        
>        opacity_entry.ValueChanged += (o, e) => bug.Opacity = opacity_entry.Value;
>
>        hbox.PackStart (new Label ("Opacity:"), false, false, 0);
>        hbox.PackStart (opacity_entry, false, false, 0);
>        vbox.PackStart (hbox, false, false, 0);
>        vbox.PackStart (bug, true, true, 0);
>
>        Add (vbox);
>    }
>
>    class CheckerBugDrawing : DrawingArea
>    {
>        double opacity = 1.0;
>        public double Opacity {
>            get { return opacity; }
>            set { opacity = value; QueueDraw (); }
>        }
>
>        protected override bool OnExposeEvent (Gdk.EventExpose evnt)
>        {
>            var cr = Gdk.CairoHelper.Create (GdkWindow);
>
>            // Bug is reproduced here
>            cr.Rectangle (0, 0, Allocation.Width, Allocation.Height);
>            cr.Color = new Color (0, 0, 0, Opacity);
>            cr.Fill ();
>            
>            ((IDisposable)cr).Dispose ();
>            return true; 
>        }
>    }
>}
>

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Attachments on bug 426370: 239618 | 241788 | 242324 | 242325