Hi all, I don't know the difference between these types(GtkImage, GdkImage, GdkPixmap and GdkBitmap) although I have read the GTK and GDK API Reference Manual.
Suppose I want to create a new RGB bitmap with 3 x 3 in size and I want to set all pixel values to be 0. After clicking a button, all pixel values will change to 255. Which one of the above types should I use? Should GdkImage be used as I can see there are functions to change the pixel values (gdk_image_put_pixel) in this type, but not in other types. But when I use this type to create a bitmap, this function (gdk_image_new) is used. There is a parameter with the type (GdkVisual*) which I don't know how to set/initialize. When I use gdk_visual_get_system (void) to initialize the type of GdkVisual*, I can compile it. But when I run it, there are some errors as below and the bitmap cannot be generated. example_font_selector[8794]: GLIB CRITICAL ** GLib-GObject - gtype.c:2217: initialization assertion failed, use IA__g_type_init() prior to this function example_font_selector[8794]: GLIB CRITICAL ** Gdk - gdk_screen_get_system_visual: assertion `GDK_IS_SCREEN (screen)' failed example_font_selector[8794]: GLIB CRITICAL ** GLib-GObject - gtype.c:2217: initialization assertion failed, use IA__g_type_init() prior to this function example_font_selector[8794]: GLIB CRITICAL ** Gdk - gdk_visual_get_screen: assertion `GDK_IS_VISUAL (visual)' failed example_font_selector[8794]: GLIB CRITICAL ** Gdk - _gdk_image_new_for_depth: assertion `visual || depth != -1' failed Thank you for your kind attention. Regards, Hung _______________________________________________ maemo-developers mailing list [email protected] https://lists.maemo.org/mailman/listinfo/maemo-developers
