File: gdk-visual.adb

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-----------------------------------------------------------------------
--               GtkAda - Ada95 binding for Gtk+/Gnome               --
--                                                                   --
--   Copyright (C) 1998-2000 E. Briot, J. Brobecker and A. Charlet   --
--                Copyright (C) 2000-2001 ACT-Europe                 --
--                                                                   --
-- This library is free software; you can redistribute it and/or     --
-- modify it under the terms of the GNU 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 --
-- General Public License for more details.                          --
--                                                                   --
-- You should have received a copy of the GNU 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.                                       --
--                                                                   --
-----------------------------------------------------------------------

with Interfaces.C.Pointers;

package body Gdk.Visual is

   type Aliased_Gint_Array is array (Natural range <>) of aliased Gint;

   package Gint_Ptr is new Interfaces.C.Pointers
     (Index => Natural, Element => Gint, Element_Array => Aliased_Gint_Array,
      Default_Terminator => 0);

   type Aliased_Visual_Type_Array is array (Natural range <>)
     of aliased Gdk_Visual_Type;

   package Visual_Type_Ptr is new Interfaces.C.Pointers
     (Index => Natural, Element => Gdk_Visual_Type,
      Element_Array => Aliased_Visual_Type_Array,
      Default_Terminator => Visual_Static_Gray);

   --------------
   -- Get_Best --
   --------------

   function Get_Best return Gdk_Visual is
      function Internal return Gdk_Visual;
      pragma Import (C, Internal, "gdk_visual_get_best");
   begin
      return Internal;
   end Get_Best;

   procedure Get_Best (Visual : out Gdk_Visual) is
   begin
      Visual := Get_Best;
   end Get_Best;

   function Get_Best (Depth : Gint) return Gdk_Visual is
      function Internal (Depth : Gint) return Gdk_Visual;
      pragma Import (C, Internal, "gdk_visual_get_best_with_depth");

   begin
      return Internal (Depth);
   end Get_Best;

   function Get_Best (Visual_Type : Gdk_Visual_Type) return Gdk_Visual is
      function Internal (Visual_Type : Gdk_Visual_Type) return Gdk_Visual;
      pragma Import (C, Internal, "gdk_visual_get_best_with_type");

   begin
      return Internal (Visual_Type);
   end Get_Best;

   function Get_Best
     (Depth : Gint; Visual_Type : Gdk_Visual_Type) return Gdk_Visual
   is
      function Internal
        (Depth : Gint; Visual_Type : Gdk_Visual_Type) return Gdk_Visual;
      pragma Import (C, Internal, "gdk_visual_get_best_with_both");

   begin
      return Internal (Depth, Visual_Type);
   end Get_Best;

   ------------------
   -- List_Visuals --
   ------------------

   function List_Visuals return Gdk_Visual_List.Glist is
      function Internal return System.Address;
      pragma Import (C, Internal, "gdk_list_visuals");
      Result : Gdk_Visual_List.Glist;
   begin
      Gdk_Visual_List.Set_Object (Result, Internal);
      return Result;
   end List_Visuals;

   ------------------
   -- Query_Depths --
   ------------------

   function Query_Depths return Gint_Array is
      procedure Internal (Depths : out Gint_Ptr.Pointer; Count : out Gint);
      pragma Import (C, Internal, "gdk_query_depths");

      Internal_Result : Gint_Ptr.Pointer;
      Count : Gint;

   begin
      Internal (Internal_Result, Count);

      declare
         Temp : constant Aliased_Gint_Array :=
           Gint_Ptr.Value (Ref => Internal_Result,
                           Length => Interfaces.C.ptrdiff_t (Count));
         Result : Gint_Array (1 .. Temp'Length);

      begin
         for Index in Temp'Range loop
            Result (Result'First + Index - Temp'First) := Temp (Index);
         end loop;

         return Result;
      end;
   end Query_Depths;

   ------------------------
   -- Query_Visual_Types --
   ------------------------

   function Query_Visual_Types return Gdk_Visual_Type_Array is
      procedure Internal (Visual_Type : out Visual_Type_Ptr.Pointer;
                          Count : out Gint);
      pragma Import (C, Internal, "gdk_query_visual_types");

      Internal_Result : Visual_Type_Ptr.Pointer;
      Count : Gint;

   begin
      Internal (Internal_Result, Count);

      declare
         Temp : constant Aliased_Visual_Type_Array :=
           Visual_Type_Ptr.Value (Ref => Internal_Result,
                                  Length => Interfaces.C.ptrdiff_t (Count));
         Result : Gdk_Visual_Type_Array (1 .. Temp'Length);

      begin
         for Index in Temp'Range loop
            Result (Result'First + Index - Temp'First) := Temp (Index);
         end loop;

         return Result;
      end;
   end Query_Visual_Types;

end Gdk.Visual;