Use named cursors for the DND cursors, the names are "dnd-none",

2005-06-14  Matthias Clasen  <mclasen@redhat.com>

	Use named cursors for the DND cursors, the names are "dnd-none",
	"dnd-copy", "dnd-link", "dnd-move" and "dnd-ask". Also use an RGBA
	cursor instead of cursor+window when possible. This saves
	roundtrips during the drag operation, and makes translucent icons
	possible.

	* gtk/gtkdndcursors.h: New file, containing inlined pixbufs
	for the default dnd cursors.

	* gtk/gtkdnd.c (struct _GtkDragSourceInfo): Store the cursors
	used during the drag here, also store the icon pixbuf here.

	* gtk/gtkdnd.c (drag_cursors): Store the cursor names here. Also
	switch the default cursors from xbm to inlined pixbufs.

	* gtk/gtkdnd.c (gtk_drag_get_cursor): This function now takes the
	GtkDragSourceInfo as well, since it has to composite the
	drag-specific cursors. The cursors combined from the image of
	the themed cursor and the icon_pixbuf stored in the info.

	* gtk/gtkdnd.c (gtk_drag_begin_internal): Don't set the default
	icon if there is an icon_pixbuf, which will be composited into
	the cursor later.

	* gtk/gtkdnd.c (set_icon_stock_pixbuf): If appropriate, store
	the pixbuf in the info struct for later compositing into the
	cursor instead of creating an icon window.

	* gtk/gtkdnd.c (gtk_drag_drop_finished): If we used an
	RGBA cursor for the drag, and need to display the cancel
	animation, construct the icon window here.

	* gtk/gtkdnd.c (gtk_drag_source_info_destroy): Unref the
	drag-specific cursors and the icon_pixbuf when done with
	the drag.

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