-- ----------------------------------------------------------------- --
-- --
-- This 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 software 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. --
-- --
-- ----------------------------------------------------------------- --
-- ----------------------------------------------------------------- --
-- This is a translation, to the Ada programming language, of the --
-- original C test files written by Sam Lantinga - www.libsdl.org --
-- translation made by Antonio F. Vargas - www.adapower.net/~avargas --
-- ----------------------------------------------------------------- --
-- ----------------------------------------------------------------- --
-- WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
-- ----------------------------------------------------------------- --
-- SERIOUS WARNING: The Ada code in this files may, at some points,
-- rely directly on pointer arithmetic which is considered very
-- unsafe and PRONE TO ERROR. The AdaSDL_Framebuffer examples are
-- more appropriate and easier to understand. They should be used in
-- replacement of this files. Please go there.
-- This file exists only for the sake of completness and to test
-- AdaSDL without the dependency of AdaSDL_Framebuffer.
-- ----------------------------------------------------------------- --
-- WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
-- ----------------------------------------------------------------- --
with Interfaces.C.Strings;
with Ada.Command_Line;
with Ada.Characters.Handling;
with Ada.Text_IO; use Ada.Text_IO;
with GNAT.OS_Lib;
with SDL.Types; use SDL.Types;
with SDL.Video;
with SDL.Events;
with SDL.Error;
with SDL.Quit;
with Picture_xbm; use Picture_xbm;
with Lib_C;
procedure TestBitmap is
package C renames Interfaces.C;
use type C.int;
package CS renames C.Strings;
package CL renames Ada.Command_Line;
package CH renames Ada.Characters.Handling;
package V renames SDL.Video;
use type V.Surface_ptr;
use type V.Surface_Flags;
package Ev renames SDL.Events;
package Er renames SDL.Error;
Screen_Width : constant := 640;
Screen_Height : constant := 480;
package Uint8_IO is new Modular_IO (Uint8);
use SDL.Types.Uint8_PtrOps;
use SDL.Types.Uint8_Ptrs;
-- ===============================================
function LoadXBM (screen : V.Surface_ptr;
w, h : C.int;
bits : Uint8_PtrOps.Pointer) return V.Surface_ptr
is
ww : C.int := w;
hh : C.int := h;
The_Bits : Uint8_PtrOps.Pointer := bits;
bitmap : V.Surface_ptr;
line : SDL.Types.Uint8_PtrOps.Pointer;
begin
-- Allocate the bitmap
bitmap := V.CreateRGBSurface (
V.SWSURFACE, w, h, 1, 0, 0, 0, 0);
if bitmap = null then
Put_Line ("Couldn't allocate bitmap: " & Er.Get_Error);
return null;
end if;
-- Copy the pixels
line := Pointer (Uint8_Ptrs.To_Pointer (bitmap.pixels));
ww := (ww + 7) / 8;
while hh > 0 loop
hh := hh - 1;
Uint8_PtrOps.Copy_Array (The_Bits, line, C.ptrdiff_t (ww));
-- X11 Bitmap images have the bits reversed
declare
i : C.int;
buf : Uint8_PtrOps.Pointer;
byte : Uint8;
use Interfaces;
begin
buf := line;
i := 0;
while i < ww loop
byte := buf.all;
buf.all := 0;
for j in reverse 0 .. 7 loop
buf.all := buf.all
or Shift_Left (
byte and 16#01#,
j);
byte := Shift_Right (byte, 1);
end loop;
i := i + 1;
Increment (buf);
end loop;
end;
line := line + C.ptrdiff_t (bitmap.pitch);
The_Bits := The_Bits + C.ptrdiff_t (ww);
end loop;
return bitmap;
end LoadXBM;
-- ===============================================
screen : V.Surface_ptr;
bitmap : V.Surface_ptr;
video_bpp : Uint8;
videoflags : V.Surface_Flags;
buffer : Uint8_PtrOps.Pointer;
done : Boolean;
event : Ev.Event;
argc : Integer := CL.Argument_Count;
PollEvent_Result : C.int;
begin
-- Initialize SDL
if SDL.Init (SDL.INIT_VIDEO) < 0 then
Put_Line ("Couldn't initialize SDL: " & Er.Get_Error);
GNAT.OS_Lib.OS_Exit (1);
end if;
SDL.Quit.atexit (SDL.SDL_Quit'Access);
video_bpp := 0;
videoflags := V.SWSURFACE;
while argc > 0 loop
if (argc > 1) and then
(CL.Argument (argc - 1) = "-bpp") and then
CH.Is_Digit (CL.Argument (argc) (1)) then
declare
last : Positive;
begin
Uint8_IO.Get (CL.Argument (argc), video_bpp, last);
end;
argc := argc - 2;
elsif CL.Argument (argc) = "-hw" then
videoflags := videoflags or V.HWSURFACE;
argc := argc - 1;
elsif CL.Argument (argc) = "-warp" then
videoflags := videoflags or V.HWPALETTE;
argc := argc -1;
elsif CL.Argument (argc) = "-fullscreen" then
videoflags := videoflags or V.FULLSCREEN;
argc := argc - 1;
else
Put_Line ("Usage: " & CL.Command_Name &
"[-bpp N] [-hw] [-warp] [-fullscreen]");
GNAT.OS_Lib.OS_Exit (1);
end if;
end loop;
-- Set video mode
screen := V.SetVideoMode (Screen_Width, Screen_Height,
C.int (video_bpp), videoflags);
if screen = null then
Put_Line ("Couldn't set " & Integer'Image (Screen_Width) &
"x" & Integer'Image (Screen_Height) &
" video mode: " & Er.Get_Error);
GNAT.OS_Lib.OS_Exit (2);
end if;
-- Set the surface pixels and refresh
if V.LockSurface (screen) < 0 then
Put_Line ("Couldn't lock the display surface: " & Er.Get_Error);
GNAT.OS_Lib.OS_Exit (2);
end if;
buffer := Pointer (To_Pointer (screen.pixels));
for i in 0 .. screen.h - 1 loop
Lib_C.Mem_Set (To_Address (Uint8_Ptrs.Object_Pointer (buffer)),
(i * 255) / screen.h,
C.size_t (screen.pitch));
buffer := buffer + C.ptrdiff_t (screen.pitch);
end loop;
V.UnlockSurface (screen);
V.UpdateRect (screen, 0, 0, 0, 0);
-- Load the bitmap
bitmap := LoadXBM (screen, picture_width, picture_height,
Uint8_PtrOps.Pointer'(picture_bits(0)'Access));
if bitmap = null then
GNAT.OS_Lib.OS_Exit (1);
end if;
-- Wait for a keystroke
done := False;
while not done loop
loop
Ev.PollEventVP (PollEvent_Result, event);
exit when PollEvent_Result = 0;
case event.the_type is
when Ev.MOUSEBUTTONDOWN =>
declare
dst : V.Rect;
begin
dst.x := Sint16 (C.int (event.button.x) - bitmap.w / 2);
dst.y := Sint16 (C.int (event.button.y) - bitmap.h / 2);
dst.w := Uint16 (bitmap.w);
dst.h := Uint16 (bitmap.h);
V.BlitSurface (bitmap, null, screen, dst);
V.Update_Rect (screen, dst);
end;
when Ev.KEYDOWN => done := True;
when Ev.QUIT => done := True;
when others => null;
end case;
end loop;
end loop;
V.FreeSurface (bitmap);
GNAT.OS_Lib.OS_Exit (0);
end TestBitmap;
syntax highlighted by Code2HTML, v. 0.9.1