kolibrios/programs/demos/magnify/trunk/magnify.asm

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;---------------------------------------------------------------------
; MAGNIFY SCREEN v1.0
;
; Version for KolibriOS 2005-2011
;
; Version for Menuet to 2005
;---------------------------------------------------------------------
; last update: 08/18/2011
; changed by: Marat Zakiyanov aka Mario79, aka Mario
; changes: Checking for "rolled up" window
;---------------------------------------------------------------------
use32
org 0x0
db 'MENUET01' ; 8 byte id
dd 1 ; header version
dd START ; program start
dd I_END ; program image size
dd 0x1000 ; required amount of memory
dd 0x1000 ; esp
dd 0, 0 ; no parameters, no path
;---------------------------------------------------------------------
include 'lang.inc'
include '..\..\..\macros.inc'
delay equ 20
magnify_width = 40
magnify_height = 30
;---------------------------------------------------------------------
START: ; start of execution
redraw:
call draw_window
still:
call draw_magnify
wtevent:
mcall 23,delay ; wait here for event with timeout
dec eax
js still
jz redraw
dec eax
jnz button
; key in buffer
mov al, 2
mcall
jmp wtevent
;---------------------------------------------------------------------
button:
; we have only one button, close
or eax, -1
mcall
;---------------------------------------------------------------------
; ******* WINDOW DEFINITIONS AND DRAW ********
;---------------------------------------------------------------------
draw_window:
mcall 12,1
mov al, 48 ; function 48 : graphics parameters
mov bl, 4 ; subfunction 4 : get skin height
mcall
; DRAW WINDOW
mov ebx, 100*65536 + 8*magnify_width + 8
lea ecx, [eax + 100*65536 + 8*magnify_height + 3]
mov edx, 0x34000000 ; color of work area RRGGBB
mov edi, labelt ; header
xor eax, eax ; function 0 : define and draw window
mcall
mcall 12,2
ret
;---------------------------------------------------------------------
draw_magnify:
mcall 9,procinfo,-1
mov eax,[procinfo+70] ;status of window
test eax,100b
jne .end
mcall 14 ; get screen size
movzx ecx, ax
inc ecx
mov [size_y], ecx
shr eax, 16
inc eax
mov [size_x], eax
xor ebx, ebx
mcall 37 ; get mouse coordinates
mov ecx, eax
shr ecx, 16 ; ecx = x
movzx edx, ax ; edx = y
inc ecx
mov [m_xe], ecx
inc edx
mov [m_ye], edx
sub ecx, magnify_width
sub edx, magnify_height
mov [m_x], ecx
mov [m_y], edx
.loop_y:
.loop_x:
xor eax, eax ; assume black color for invalid pixels
test ecx, ecx
js .nopix
cmp ecx, [size_x]
jge .nopix
test edx, edx
js .nopix
cmp edx, [size_y]
jge .nopix
mov ebx, edx
imul ebx, [size_x]
add ebx, ecx
mcall 35 ; read pixel
.nopix:
push ecx edx
sub ecx, [m_x]
sub edx, [m_y]
mov ebx, ecx
shl ebx, 3+16
mov bl, 7
mov ecx, edx
shl ecx, 3+16
mov cl, 7
mov edx, eax
mcall 13
pop edx ecx
inc ecx
cmp ecx, [m_xe]
jnz .loop_x
mov ecx, [m_x]
inc edx
cmp edx, [m_ye]
jnz .loop_y
.end:
ret
;---------------------------------------------------------------------
; DATA AREA
;---------------------------------------------------------------------
if lang eq ru
labelt:
db 'Magnifier - <20><><EFBFBD><E0A0AD><EFBFBD> <20>㯠', 0
else
labelt:
db 'Magnifier', 0
end if
I_END:
align 4
m_x dd ?
m_y dd ?
m_xe dd ?
m_ye dd ?
size_x dd ?
size_y dd ?
;---------------------------------------------------------------------
procinfo:
rb 1024
;---------------------------------------------------------------------