153 lines
3.9 KiB
NASM
153 lines
3.9 KiB
NASM
;
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; MAGNIFY SCREEN
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;
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; Compile with FASM for Menuet
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;
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use32
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org 0x0
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db 'MENUET01' ; 8 byte id
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dd 1 ; header version
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dd START ; program start
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dd I_END ; program image size
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dd 0x1000 ; required amount of memory
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dd 0x1000 ; esp
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dd 0, 0 ; no parameters, no path
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include '..\..\..\macros.inc'
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delay equ 20
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magnify_width = 40
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magnify_height = 30
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START: ; start of execution
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redraw:
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call draw_window
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still:
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call draw_screen
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wtevent:
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mov eax, 23 ; wait here for event with timeout
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mov ebx, delay
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mcall
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dec eax
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js still
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jz redraw
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dec eax
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jnz button
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; key in buffer
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mov al, 2
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mcall
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jmp wtevent
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button:
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; we have only one button, close
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or eax, -1
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mcall
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; *********************************************
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; ******* WINDOW DEFINITIONS AND DRAW ********
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; *********************************************
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draw_window:
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mov eax, 12 ; function 12:tell os about windowdraw
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mov ebx, 1 ; 1, start of draw
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mcall
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mov al, 48 ; function 48 : graphics parameters
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mov bl, 4 ; subfunction 4 : get skin height
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mcall
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; DRAW WINDOW
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mov ebx, 100*65536 + 8*magnify_width + 8
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lea ecx, [eax + 100*65536 + 8*magnify_height + 3]
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mov edx, 0x34000000 ; color of work area RRGGBB
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mov edi, labelt ; header
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xor eax, eax ; function 0 : define and draw window
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mcall
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mov al, 12 ; function 12:tell os about windowdraw
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mov ebx, 2 ; 2, end of draw
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mcall
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ret
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draw_screen:
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draw_magnify:
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mov eax, 14
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mcall ; get screen size
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movzx ecx, ax
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inc ecx
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mov [size_y], ecx
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shr eax, 16
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inc eax
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mov [size_x], eax
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mov eax, 37
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xor ebx, ebx
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mcall ; get mouse coordinates
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mov ecx, eax
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shr ecx, 16 ; ecx = x
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movzx edx, ax ; edx = y
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inc ecx
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mov [m_xe], ecx
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inc edx
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mov [m_ye], edx
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sub ecx, magnify_width
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sub edx, magnify_height
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mov [m_x], ecx
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mov [m_y], edx
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.loop_y:
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.loop_x:
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xor eax, eax ; assume black color for invalid pixels
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test ecx, ecx
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js .nopix
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cmp ecx, [size_x]
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jge .nopix
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test edx, edx
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js .nopix
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cmp edx, [size_y]
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jge .nopix
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mov ebx, edx
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imul ebx, [size_x]
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add ebx, ecx
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mov eax, 35
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mcall ; read pixel
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.nopix:
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push ecx edx
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sub ecx, [m_x]
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sub edx, [m_y]
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mov ebx, ecx
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shl ebx, 3+16
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mov bl, 7
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mov ecx, edx
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shl ecx, 3+16
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mov cl, 7
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mov edx, eax
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mov eax, 13
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mcall
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pop edx ecx
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inc ecx
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cmp ecx, [m_xe]
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jnz .loop_x
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mov ecx, [m_x]
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inc edx
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cmp edx, [m_ye]
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jnz .loop_y
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ret
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; DATA AREA
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labelt:
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db 'MAGNIFIER - MOVE MOUSE POINTER', 0
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I_END:
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align 4
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m_x dd ?
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m_y dd ?
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m_xe dd ?
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m_ye dd ?
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size_x dd ?
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size_y dd ?
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