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

;---------------------------------------------------------------------
;    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' ; Language support for locales: ru_RU (CP866), en_US.
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, 8
	mov	ecx, edx
	shl	ecx, 3+16
	mov	cl, 8
	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_RU
labelt:
    db   'Magnifier - <20><>࠭<EFBFBD><E0A0AD><EFBFBD> <20>㯠', 0
else ; Default to en_US
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
;---------------------------------------------------------------------