Experimental preview implementation using XShmGetImage.

Not hooked up yet.

lib/sugar/Makefile.am

@@ -32,7 +32,9 @@ _sugarext_la_SOURCES =			\
 	sugar-key-grabber.c		\
 	sugar-key-grabber.h		\
 	sugar-menu.h			\
-	sugar-menu.c
+	sugar-menu.c			\
+	sugar-preview.h			\
+	sugar-preview.c
 
 BUILT_SOURCES = 			\
 	_sugarext.c			\

lib/sugar/_sugarext.defs

@@ -22,6 +22,13 @@
   (gtype-id "SUGAR_TYPE_MENU")
 )
 
+(define-object Preview
+  (in-module "Sugar")
+  (parent "GObject")
+  (c-name "SugarPreview")
+  (gtype-id "SUGAR_TYPE_PREVIEW")
+)
+
 (define-object IconEntry
   (in-module "Sexy")
   (parent "GtkEntry")
@@ -150,3 +157,27 @@
   (return-type "none")
 )
 
+;; From sugar-preview.h
+
+(define-function sugar_preview_get_type
+  (c-name "sugar_preview_get_type")
+  (return-type "GType")
+)
+
+(define-method take_screenshot
+  (of-object "SugarPreview")
+  (c-name "sugar_preview_take_screenshot")
+  (return-type "none")
+  (parameters
+    '("GdkDrawable" "drawable")
+  )
+)
+
+(define-method save
+  (of-object "SugarPreview")
+  (c-name "sugar_preview_save")
+  (return-type "gboolean")
+  (parameters
+    '("const-char*" "key")
+  )
+)

lib/sugar/_sugarext.override

@@ -7,6 +7,7 @@ headers
 #include "sugar-address-entry.h"
 #include "sugar-key-grabber.h"
 #include "sugar-menu.h"
+#include "sugar-preview.h"
 #include "sexy-icon-entry.h"
 
 #include <pygtk/pygtk.h>
@@ -20,6 +21,7 @@ import gtk.Entry as PyGtkEntry_Type
 import gtk.Menu as PyGtkMenu_Type
 import gtk.Container as PyGtkContainer_Type
 import gtk.gdk.Window as PyGdkWindow_Type
+import gtk.gdk.Drawable as PyGdkDrawable_Type
 import gtk.Image as PyGtkImage_Type
 %%
 ignore-glob

lib/sugar/sugar-preview.c

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2007, Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gdk/gdkx.h>
+#include <gtk/gtkwindow.h>
+
+#include "sugar-preview.h"
+
+static void sugar_preview_class_init (SugarPreviewClass *menu_class);
+static void sugar_preview_init       (SugarPreview *menu);
+
+G_DEFINE_TYPE(SugarPreview, sugar_preview, G_TYPE_OBJECT)
+
+gboolean
+sugar_preview_save(SugarPreview *preview, const char *file_name)
+{
+    GdkPixbuf *pixbuf;
+
+    if (preview->image != NULL) {
+        return FALSE;
+    }
+
+    pixbuf = gdk_pixbuf_get_from_image(NULL, preview->image, NULL,
+                                       0, 0, 0, 0,
+                                       preview->image->width,
+                                       preview->image->height);
+
+    gdk_pixbuf_save(pixbuf, file_name, "png", NULL);
+
+    if (preview->image != NULL) {
+        g_object_unref(G_OBJECT(preview->image));
+        preview->image = NULL;
+    }
+
+    return TRUE;
+}
+
+void
+sugar_preview_take_screenshot(SugarPreview *preview, GdkDrawable *drawable)
+{
+    GdkScreen *screen;
+    GdkVisual *visual;
+    GdkColormap *colormap;
+    gint width, height;
+
+    gdk_drawable_get_size(drawable, &width, &height);
+
+    screen = gdk_drawable_get_screen(drawable);
+    visual = gdk_drawable_get_visual(drawable);
+    colormap = gdk_drawable_get_colormap(drawable);
+
+    if (preview->image != NULL) {
+        g_object_unref(G_OBJECT(preview->image));
+    }
+
+    preview->image = gdk_image_new(GDK_IMAGE_SHARED, visual, width, height);
+    gdk_image_set_colormap(preview->image, colormap);
+
+    XShmGetImage(GDK_SCREEN_XDISPLAY(screen),
+                 GDK_DRAWABLE_XID(drawable),
+                 gdk_x11_image_get_ximage(preview->image),
+                 0, 0, AllPlanes, ZPixmap);
+}
+
+static void
+sugar_preview_dispose (GObject *object)
+{
+    SugarPreview *preview = SUGAR_PREVIEW(object);
+
+    if (preview->image != NULL) {
+        g_object_unref(G_OBJECT(preview->image));
+        preview->image = NULL;
+    }
+}
+
+
+static void
+sugar_preview_class_init(SugarPreviewClass *preview_class)
+{
+    GObjectClass *g_object_class = G_OBJECT_CLASS (preview_class);
+
+    g_object_class->dispose = sugar_preview_dispose;
+}
+
+static void
+sugar_preview_init(SugarPreview *preview)
+{
+    preview->image = NULL;
+}

lib/sugar/sugar-preview.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2007, Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __SUGAR_PREVIEW_H__
+#define __SUGAR_PREVIEW_H__
+
+#include <gdk/gdkdrawable.h>
+
+G_BEGIN_DECLS
+
+typedef struct _SugarPreview SugarPreview;
+typedef struct _SugarPreviewClass SugarPreviewClass;
+
+#define SUGAR_TYPE_PREVIEW			    (sugar_preview_get_type())
+#define SUGAR_PREVIEW(object)	        (G_TYPE_CHECK_INSTANCE_CAST((object), SUGAR_TYPE_PREVIEW, SugarPreview))
+#define SUGAR_PREVIEW_CLASS(klass)	    (G_TYPE_CHACK_CLASS_CAST((klass), SUGAR_TYPE_PREVIEW, SugarPreviewClass))
+#define SUGAR_IS_PREVIEW(object)	    (G_TYPE_CHECK_INSTANCE_TYPE((object), SUGAR_TYPE_PREVIEW))
+#define SUGAR_IS_PREVIEW_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE((klass), SUGAR_TYPE_PREVIEW))
+#define SUGAR_PREVIEW_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS((object), SUGAR_TYPE_PREVIEW, SugarPreviewClass))
+
+struct _SugarPreview {
+    GObject base_instance;
+
+    GdkImage *image;
+};
+
+struct _SugarPreviewClass {
+	GObjectClass base_class;
+};
+
+GType	 sugar_preview_get_type         (void);
+void     sugar_preview_take_screenshot  (SugarPreview *menu,
+                                         GdkDrawable *drawable);
+gboolean sugar_preview_save             (SugarPreview *menu,
+                                         const char *file_name);
+
+G_END_DECLS
+
+#endif /* __SUGAR_PREVIEW_H__ */