Gnash: gtk_cairo_create.h Source File

Gnash 0.8.10
00001 /* GIMP Drawing Kit
00002  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
00003  *
00004  * This library is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2 of the License, or (at your option) any later version.
00008  *
00009  * This library is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with this library; if not, write to the
00016  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00017  * Boston, MA 02111-1307, USA.
00018  */
00019 
00020 #include <gdk/gdkdrawable.h>
00021 
00022 #include <cairo-xlib.h>
00023 #include <gtk/gtk.h>
00024 #ifndef _WIN32
00025 #include <gdk/gdkx.h>
00026 #else
00027 #include <gdk/gdk.h>
00028 #endif
00029 
00030 
00031 /* copied from gtk+/gdk/gdkcairo.c and gtk+/gdk/x11/gdkdrawable-x11.c
00032  * gdk_cairo_create() is be available in gtk 2.8
00033  */
00034 static cairo_t *
00035 gdk_cairo_create (GdkDrawable *target)
00036 {
00037     int width, height;
00038     int x_off=0, y_off=0;
00039     cairo_t *cr;
00040     cairo_surface_t *surface;
00041     GdkDrawable *drawable = target;
00042     GdkVisual *visual;
00043 
00044     if (GDK_IS_WINDOW(target)) {
00045         /* query the window's backbuffer if it has one */
00046         GdkWindow *window = GDK_WINDOW(target);
00047         gdk_window_get_internal_paint_info (window,
00048                                             &drawable, &x_off, &y_off);
00049     }
00050     visual = gdk_drawable_get_visual (drawable);
00051     gdk_drawable_get_size (drawable, &width, &height);
00052 
00053     if (visual) {
00054         surface = cairo_xlib_surface_create (GDK_DRAWABLE_XDISPLAY (drawable),
00055                                              GDK_DRAWABLE_XID (drawable),
00056                                              GDK_VISUAL_XVISUAL (visual),
00057                                              width, height);
00058     } else if (gdk_drawable_get_depth (drawable) == 1) {
00059         surface = cairo_xlib_surface_create_for_bitmap
00060             (GDK_PIXMAP_XDISPLAY (drawable),
00061              GDK_PIXMAP_XID (drawable),
00062              GDK_SCREEN_XSCREEN (gdk_drawable_get_screen (drawable)),
00063              width, height);
00064     } else {
00065         g_warning ("Using Cairo rendering requires the drawable argument to\n"
00066                    "have a specified colormap. All windows have a colormap,\n"
00067                    "however, pixmaps only have colormap by default if they\n"
00068                    "were created with a non-NULL window argument. Otherwise\n"
00069                    "a colormap must be set on them with "
00070                    "gdk_drawable_set_colormap");
00071         return NULL;
00072     }
00073     cairo_surface_set_device_offset (surface, -x_off, -y_off);
00074     cr = cairo_create (surface);
00075     cairo_surface_destroy (surface);
00076     return cr;
00077 }