mcs/class/Mono.Cairo/Samples/gtk/sysdraw.cs

   1 //
   2 //
   3 //      GDK-X11 interface
   4 //
   5
   6 //
   7 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Reflection;
  31 using System.Runtime.InteropServices;
  32 using Gtk;
  33 using Cairo;
  34
  35 namespace Gdk
  36 {
  37         public class Context
  38         {
  39                 //Use [DllImport("libgdk-win32-2.0-0.dll")] for  Win32
  40                 [DllImport("libgdk-x11-2.0.so")]
  41                   internal static extern IntPtr gdk_x11_drawable_get_xdisplay (IntPtr raw);
  42
  43                 [DllImport("libgdk-x11-2.0.so")]
  44                   internal static extern IntPtr gdk_x11_drawable_get_xid (IntPtr raw);
  45
  46                 [DllImport("libgdk-x11-2.0.so")]
  47                   internal static extern IntPtr gdk_drawable_get_visual (IntPtr raw);
  48
  49                 [DllImport("libgdk-x11-2.0.so")]
  50                   internal static extern IntPtr gdk_x11_visual_get_xvisual (IntPtr raw);
  51
  52                 [DllImport("libgdk-x11-2.0.so")]
  53                   internal static extern IntPtr gdk_cairo_create (IntPtr raw);
  54
  55                 public static Cairo.Context CreateDrawable (Gdk.Drawable drawable)
  56                 {
  57                         IntPtr x_drawable = IntPtr.Zero;
  58                         int x_off = 0, y_off = 0;
  59
  60                         int x, y, w, h, d;
  61                         ((Gdk.Window)drawable).GetGeometry(out x, out y, out w, out h, out d);
  62
  63                         bool is_gdk_window = drawable is Gdk.Window;
  64                         if (is_gdk_window)
  65                                 ((Gdk.Window) drawable).GetInternalPaintInfo(out drawable,
  66                                                                              out x_off, out y_off);
  67
  68                         x_drawable = drawable.Handle;
  69                         IntPtr visual = gdk_drawable_get_visual(x_drawable);
  70
  71                         IntPtr Xdisplay = gdk_x11_drawable_get_xdisplay(x_drawable);
  72                         IntPtr Xvisual = gdk_x11_visual_get_xvisual(visual);
  73                         IntPtr Xdrawable = gdk_x11_drawable_get_xid (x_drawable);
  74
  75                         Cairo.XlibSurface s = new Cairo.XlibSurface (Xdisplay,
  76                                                                    Xdrawable,
  77                                                                    Xvisual,
  78                                                                    w, h);
  79
  80                         Cairo.Context g = new Cairo.Context (s);
  81
  82                         // this can be safely removed now, just keep it for a bit more
  83                         //Cairo.Context g = new Cairo.Context (
  84                         //                    gdk_cairo_create (x_drawable ));
  85
  86                         if (is_gdk_window)
  87                                 g.Translate (-(double)x_off,-(double)y_off);
  88                         return g;
  89                 }
  90         }
  91 }