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; must be large enough, else we will get evil memory corruptions
kroete.width equ 520
kroete.height equ 236
; esi kroete data
; edi drawing buffer
; [idle.data2] direction (0 forward, != 0 backward)
kroete:
movzx eax,word [es:edi] ; width
mov edx,[pixel_bytes]
imul edx,eax
mov [tmp_var_0],edx
movzx edx,word [es:edi+2] ; height
inc edx
mul edx
shr eax,1
mul dword [pixel_bytes]
add edi,4
add edi,eax
; edi: start offset into buffer
call [getpixel]
cmp byte [idle.data2],0
jnz sul3
lea ebp,[esi+16384]
sul:
mov bl,[es:esi]
rol bl,2
call doit
rol bl,2
call doit
rol bl,2
call doit
rol bl,2
call doit
inc esi
cmp esi,ebp
jnz sul
jmp sul5
sul3:
lea ebp,[esi-1]
add esi,16383
sul4:
mov bl,[es:esi]
xor bl,0xaa
call doit
ror bl,2
call doit
ror bl,2
call doit
ror bl,2
call doit
dec esi
cmp esi,ebp
jnz sul4
sul5:
call [setpixel_a]
ret
doit:
xchg eax,edx
call [getpixel]
xchg eax,edx
call [setpixel_a]
xchg eax,edx
mov edx,ebx
and edx,3
jmp [doit_tab+4*edx]
doit0:
sub edi,[pixel_bytes]
ret
doit1:
sub edi,[tmp_var_0]
ret
doit2:
add edi,[pixel_bytes]
ret
doit3:
add edi,[tmp_var_0]
ret
align 4, db 0
doit_tab dd doit0, doit1, doit2, doit3
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