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$Revision: 425 $

;

; Call of videomode driver's functions

;

; (Add in System function 21 (and/or 26) as a subfunction 13)

;

; Author: Trans

; Date:  19.07.2003

;

; Include in MeOS kernel and compile with FASM

;

uglobal

  old_screen_width  dd ?

  old_screen_height dd ?

endg

     cmp  eax,13                 ; CALL VIDEOMODE DRIVER FUNCTIONS

     jne  .no_vmode_drv_access

        pushd   [ScreenWidth] [ScreenHeight]

	popd	[old_screen_height] [old_screen_width]

     or   eax,-1                 ; If driver is absent then eax does not change

     call 0x760100               ; Entry point of video driver

     mov  [esp+36],eax

     mov  [esp+24],ebx

     mov  [esp+32],ecx

;    mov  [esp+28],edx

	mov	eax,[old_screen_width]

	mov	ebx,[old_screen_height]

        sub     eax,[ScreenWidth]

	jnz	@f

        sub     ebx,[ScreenHeight]

	jz	.resolution_wasnt_changed

	jmp	.lp1

    @@: sub     ebx,[ScreenHeight]

  .lp1: sub	[screen_workarea.right],eax

	sub	[screen_workarea.bottom],ebx

	call	repos_windows

        mov     eax, 0

        mov     ebx, 0

        mov     ecx, [ScreenWidth]

        mov     edx, [ScreenHeight]

	call	calculatescreen

  .resolution_wasnt_changed:

     ret

   .no_vmode_drv_access: