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kolibrios/programs/system/cropflat/cropflat.asm

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;*****************************************************************************
; CROPFLAT - set limits of screen - for Kolibri OS
; Copyright (c) 2012, Marat Zakiyanov aka Mario79, aka Mario
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions are met:
; * Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; * Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; * Neither the name of the <organization> nor the
; names of its contributors may be used to endorse or promote products
; derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY Marat Zakiyanov ''AS IS'' AND ANY
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
; DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;*****************************************************************************
;
; Example run with parameters:
; CROPFLAT XS800 YS480
;
;------------------------------------------------------------------------------
use32
org 0x0
db 'MENUET01'
dd 0x01
dd START
dd IM_END
dd I_END
dd stack_top
dd boot_param
dd 0x0
include '../../macros.inc'
;include '../../debug.inc'
;------------------------------------------------------------------------------
START:
mcall 14
mov ebx,eax
shr eax,16
inc eax
mov [x_size],eax
; dps "CROPFLAT current X size: "
; dpd eax
; newline
and ebx,0xffff
inc ebx
mov [y_size],ebx
; dps "CROPFLAT current Y size: "
; dpd ebx
; newline
;------------------------------------------------------------------------------
mov bx,word 'XS'
call find_value
test eax,eax
jnz .y
call convert_ASCII_to_BIN
test ebx,ebx
jz @f
mov [x_size],ebx
;--------------------------------------
@@:
; dps "CROPFLAT new X size: "
; dpd ebx
; newline
;------------------------------------------------------------------------------
.y:
mov bx,word 'YS'
call find_value
test eax,eax
jnz .set
call convert_ASCII_to_BIN
test ebx,ebx
jz @f
mov [y_size],ebx
;--------------------------------------
@@:
; dps "CROPFLAT new Y size: "
; dpd ebx
; newline
;------------------------------------------------------------------------------
.set:
mcall 18,24,[x_size],[y_size]
;--------------------------------------
.exit:
mcall -1
;------------------------------------------------------------------------------
find_value:
; in:
; bx - word
; out:
; eax - 0 for valid value, -1 for invalid value
; esi - ASCII value
mov esi,boot_param
mov ecx,254
cld
;--------------------------------------
.loop:
lodsw
cmp ax,bx
je @f
dec esi
loop .loop
mov eax,-1
ret
;--------------------------------------
@@:
xor eax,eax
ret
;------------------------------------------------------------------------------
convert_ASCII_to_BIN:
; in:
; esi - ASCII value
; out:
; ebx - BIN value
mov ecx,4
xor ebx,ebx
cld
;--------------------------------------
.loop:
lodsb
cmp al,0x30 ; 0
jb @f
cmp al,0x39 ; 9
ja @f
sub al,0x30
; multiply by 10
lea ebx,[ebx+ebx*4] ; multiply by 5
shl ebx,1 ; multiply by 2
movzx eax,al
add ebx,eax
loop .loop
;--------------------------------------
@@:
ret
;------------------------------------------------------------------------------
IM_END:
;------------------------------------------------------------------------------
align 4
x_size rd 1
y_size rd 1
;------------------------------------------------------------------------------
align 4
boot_param:
rb 256+1 ; +1 for reserve
;------------------------------------------------------------------------------
align 4
rb 512
stack_top:
;------------------------------------------------------------------------------
I_END:
;------------------------------------------------------------------------------