Dir structure for ports
=======================

The directory structure here is:

 gdk/
 gdk/x11
 gdk/win32
 ...
 
The gdk/ directory directly contains all public
header files (that are not specific to one 
windowing system).

There, in general should be no system dependency 

For each set of functionality, there are the following
files:

 gdkwindow.h:        public header file
 gdkwindow.c:        common implementation
 x11/gdkwindow.i:    functionality specific to X11
 win32/gdkwindow.i: functionality specific to win32

The gdkwindow.c file looks like:

====
#include "gdkwindow.h"

#ifdef GDK_WINDOWING_X11
#include "x11/gdkwindow.i"
#elif defined(GDK_WINDOW_WIN32)
#include "win32/gdkwindow.i"
 fo#endif

[ generic implementation bits ]
====

x11/gdkwindow.i should only assume that gdkwindow.h has been
included and included all other dependencies explicitely.

The x11/ directory will contain:

 .i files
 .c files specific to X
 .h files specific to X

And a Makefile.am that takes care of distributing the
files in the directory, and also for building any
X-specific utilities. (Such as the gxid daemon).


Virtualization
==============

The concept of virtualization is that calls to draw
on a drawable are dispatched through a function table.
This potentially allows for:

 Postscript drawables
 metafiles

It also provides a nice clean framework for multi-windowing
support - instead of reimplementing a whole bunch of function
calls, one provides an implementaiton for the vtables.

X works in this way internally - per-screen functions are
virtualized inside a screen structure, and drawing functions 
are virtualized inside the GC structure.

For the virtualization of drawing, clearly GdkDrawable needs
to be virtualized. Beyond that, one has to decide on
a case-by-case basis whether a particular structure is
drawing-mode independent (like GdkRectangle) or not.

The most important GDK structures that are involved drawing are:

 GdkColor
 GdkGC
 GdkFont
 GdkRegion

The whole font aspect of Gdk is going to get heavily
reworked with the introduction of "Pango".
GdkRegion almost certainly needs to be virtualized,
if you, way, want to do postscript drawables.

While doing so, the API of GdkRegion should be
changed so that the region operations take 3 parameters
instead of returning a newly created region.


Drawable operations:
  destroy
  create_gc
  get_values
  set_values
  set_dashes
  copy

GC Operations:
  draw_point
  draw_line
  draw_rectangle
  draw_arc
  draw_polygon
  draw_string
  draw_text
  draw_text_wc
  draw_pixmap
  draw_bitmap
  draw_image
  draw_points
  draw_segments
  draw_lines


Adding multi-screen, display support.
=====================================

 The following functions need to have per-display variants:

void gdk_pointer_ungrab (guint32	 time);
void gdk_keyboard_ungrab (guint32	  time);
gint gdk_pointer_is_grabbed (void);

gint gdk_screen_width  (void);
gint gdk_screen_height (void);

gint gdk_screen_width_mm  (void);
gint gdk_screen_height_mm (void);

void gdk_beep (void);

void gdk_key_repeat_disable (void);
void gdk_key_repeat_restore (void);

gint	      gdk_visual_get_best_depth	     (void);
GdkVisualType gdk_visual_get_best_type	     (void);
GdkVisual*    gdk_visual_get_system	     (void);
GdkVisual*    gdk_visual_get_best	     (void);
GdkVisual*    gdk_visual_get_best_with_depth (gint	     depth);
GdkVisual*    gdk_visual_get_best_with_type  (GdkVisualType  visual_type);
GdkVisual*    gdk_visual_get_best_with_both  (gint	     depth,
					      GdkVisualType  visual_type);

void gdk_query_depths	    (gint	    **depths,
			     gint	     *count);
void gdk_query_visual_types (GdkVisualType  **visual_types,
			     gint	     *count);

GList* gdk_list_visuals (void);

void gdk_add_client_message_filter (GdkAtom       message_type,
				    GdkFilterFunc func,
				    gpointer      data);

guint32         gdk_drag_get_protocol (guint32          xid,
				       GdkDragProtocol *protocol);

GdkCursor* gdk_cursor_new		 (GdkCursorType	  cursor_type);
GdkCursor* gdk_cursor_new_from_pixmap	 (GdkPixmap	  *source,
					  GdkPixmap	  *mask,
					  GdkColor	  *fg,
					  GdkColor	  *bg,
					  gint		   x,
					  gint		   y);
GdkColormap* gdk_colormap_get_system	   (void);
gint	     gdk_colormap_get_system_size  (void);

GdkFont* gdk_font_load	    (const gchar    *font_name);
GdkFont* gdk_fontset_load   (gchar          *fontset_name);

gint	   gdk_selection_owner_set (GdkWindow	 *owner,
				    GdkAtom	  selection,
				    guint32	  time,
				    gint	  send_event);
GdkWindow* gdk_selection_owner_get (GdkAtom	  selection);

void	   gdk_selection_send_notify (guint32	    requestor,
				      GdkAtom	    selection,
				      GdkAtom	    target,
				      GdkAtom	    property,
				      guint32	    time);
gint	   gdk_text_property_to_text_list (GdkAtom encoding, gint format,
					   guchar *text, gint length,
					   gchar ***list);
void	   gdk_free_text_list		  (gchar **list);
gint	   gdk_string_to_compound_text	  (gchar *str,
					   GdkAtom *encoding, gint *format,
					   guchar **ctext, gint *length);
void	   gdk_free_compound_text	  (guchar *ctext);
GdkAtom gdk_atom_intern	    (const gchar *atom_name,
			     gint	  only_if_exists);
gchar*	gdk_atom_name	    (GdkAtom atom);
GList *gdk_input_list_devices		    (void);
void gdk_input_set_source		    (guint32 deviceid,
					     GdkInputSource source);
gint gdk_input_set_mode			    (guint32 deviceid,
					     GdkInputMode mode);
void gdk_input_set_axes			    (guint32 deviceid,
					     GdkAxisUse *axes);
void gdk_input_set_key			    (guint32 deviceid,
					     guint   index,
					     guint   keyval,
					     GdkModifierType modifiers);
gint         gdk_im_ready	   (void);
void         gdk_im_end		   (void);
GdkIC*       gdk_ic_new		   (GdkICAttr 		*attr,
				    GdkICAttributesType mask);
GdkRegion*     gdk_region_new	    (void);
void     gdk_event_send_clientmessage_toall (GdkEvent    *event);
gboolean gdk_event_send_client_message (GdkEvent    *event,
					guint32      xid);

 And maybe:

void      gdk_error_trap_push           (void);
gint      gdk_error_trap_pop            (void);