Re: [AL] screen switching problems

[Henrik S. <hb...@ks...>]

On Tue, 23 Jul 2002, Eric Botcazou wrote:

> > I found the problem with v4.0.1 and switching from windowed to fullscreen.
>
> Windowed to fullscreen or the other way around ?
>

Windowed to fullscreen

> > If my desktop is 32 bit and I do set less with set_color_depth() in my
> > application switching will fail. It does only work if both are equal.
>
> Did you change the color depth (i.e call set_color_depth more than once) ?
>

It fails with only one set_color_depth()


> > Can you fix ?
>
> I'll try.
>

Thanks


Henrik


Here is one small program I use to reproduce :

-------------------------------------------------

#include <stdlib.h>
#include <allegro.h>


static int fullscreen,restore;
BITMAP *ScreenBuf;

void switch_callback(void)
{

  restore = TRUE;

}


void RestoreScreen(void)
{
  scare_mouse();
  acquire_screen();
  blit(ScreenBuf,screen,0,0,0,0,800,600);
  release_screen();
  unscare_mouse();
}

void ToggleGFXMode(void)
{
  if ( fullscreen == TRUE )
	{
	  set_gfx_mode(GFX_AUTODETECT_WINDOWED,800,600,0,0);
	  fullscreen = FALSE;
	}
  else
	{
	  set_gfx_mode(GFX_AUTODETECT_FULLSCREEN,800,600,0,0);
	  fullscreen = TRUE;
	}

  set_display_switch_mode(SWITCH_PAUSE);
  set_display_switch_callback(SWITCH_IN,switch_callback);

  show_mouse(NULL);
  RestoreScreen();
  show_mouse(screen);
}

int main(void)
{
   int input;


   allegro_init();
   install_keyboard();
   install_timer();
   install_mouse();

   // if desktop is 32 bit and color depth is set to 16
   // switch fails !!!!
   //set_color_depth(32);
   set_color_depth(16);


   if (set_gfx_mode(GFX_AUTODETECT_WINDOWED,800,600,0,0))
      return -1;
   set_display_switch_mode(SWITCH_PAUSE);
   set_display_switch_callback(SWITCH_IN,switch_callback);
   fullscreen = FALSE;


   ScreenBuf = create_bitmap(800,600);
   rectfill(ScreenBuf,0,0,800-1,600-1,makecol(255,0,0));

   show_mouse(screen);

   while (TRUE)
	 {

      if ( keypressed() )
		{
		  input = readkey();
		  if (input == KEY_W << 8 )
			ToggleGFXMode();
		  else if (input >> 8 == KEY_ESC )
			break;
		}

   }

   return 0;
}
END_OF_MAIN()