public Image Copy()
{
Gdk.Colormap colormap = Gdk.Colormap.System;
/* FIXME: copying a surface to a pixbuf through a pixmap does not require writting / reading to a file,
* but it does not handle transparencies correctly and draws transparent pixels in a black color, so
* for now we force the first method */
colormap = null;
/* In unit tests running without a display, the default Screen is null and we can't get a valid colormap.
* In this scenario we use a fallback that writes the surface to a temporary file */
if (colormap == null)
{
string tempFile = System.IO.Path.GetTempFileName();
surface.WriteToPng(tempFile);
Gdk.Pixbuf pixbuf = new Gdk.Pixbuf(tempFile);
return(new Image(pixbuf));
}
else
{
Gdk.Pixmap pixmap = new Gdk.Pixmap(null, Width, Height, 24);
using (Context cr = Gdk.CairoHelper.Create(pixmap)) {
cr.Operator = Operator.Source;
cr.SetSource(surface);
cr.Paint();
}
return(new Image(Gdk.Pixbuf.FromDrawable(pixmap, Gdk.Colormap.System, 0, 0, 0, 0, Width, Height)));
}
}
private void Window_OnScreenChanged(object Send, ScreenChangedArgs args)
{
Gdk.Colormap cm = Screen.RgbaColormap;
composeAvailable = cm != null; // FIX: Do not seem to detect compose support in all cases
if (!composeAvailable)
{
cm = Screen.RgbColormap;
}
Colormap = cm;
Console.WriteLine("Compose Support: " + composeAvailable);
}