COLOR_ORDER equ MENUETOS
gif_hash_offset = gif_hash_area
macro gif2img gifsrc,imgsrc
{
local hasharea, ReadGIF, nextblock,_null
local globalColor, img_count, cur_info, img_start
local codesize, compsize, bit_count, CC, EOI, Palette
local block_ofs, table_ptr, gifmacend
local no_gc, block_skip, no_comm, noextblock, uselocal
local setPal, filltable, reinit, cycle, zadd, noinc
local notintable, er, zend, nxt, continue, ex, Gif_skipmap
local Gif_get_sym, shift, nextbl, noblock, loop1, exx
local Gif_output, next, loop2
_null fix 0x1000 ; 0x1000
if ~gifsrc eq esi
mov esi,gifsrc
end if
if ~imgsrc eq edi
mov edi,imgsrc
end if
if defined gif_hash_offset
mov eax,gif_hash_offset
else
mov eax,hasharea
end if
call ReadGIF
jmp gifmacend
if defined gif_hash_offset
else
hasharea:
times 4096 dd 0 ;4096
end if
ReadGIF:
push esi edi
mov [table_ptr],eax
mov [cur_info],edi
xor eax,eax
mov [globalColor],eax
mov [img_count],eax
inc eax
cmp dword[esi],'GIF8'
jne er ; signature
mov ecx,[esi+0xa]
inc eax
add esi,0xd
mov edi,esi
bt ecx,7
jnc nextblock
mov [globalColor],esi
call Gif_skipmap
nextblock:
cmp byte[edi],0x21
jne noextblock
inc edi
cmp byte[edi],0xf9 ; Graphic Control Ext
jne no_gc
add edi,7
jmp nextblock
no_gc:
cmp byte[edi],0xfe ; Comment Ext
jne no_comm
inc edi
block_skip:
movzx eax,byte[edi]
lea edi,[edi+eax+1]
cmp byte[edi],0
jnz block_skip
inc edi
jmp nextblock
no_comm:
cmp byte[edi],0xff ; Application Ext
jne nextblock
add edi,13
jmp block_skip
noextblock:
cmp byte[edi],0x2c ; image beginning
jne er
inc [img_count]
inc edi
mov esi,[cur_info]
xchg esi,edi
; movsd
; movsd
mov bp,word[esi+4]
movzx ebx,bp
mov [edi],ebx
mov bp,word[esi+6]
movzx ebx,bp
mov [edi+4],ebx
add edi,8
add esi,8
push edi
movzx ecx,word[esi]
inc esi
bt ecx,7
jc uselocal
push [globalColor]
mov edi,esi
jmp setPal
uselocal:
call Gif_skipmap
push esi
setPal:
movzx ecx,byte[edi]
inc ecx
mov [codesize],ecx
dec ecx
pop [Palette]
lea esi,[edi+1]
mov edi,[table_ptr]
xor eax,eax
cld
lodsb ; eax - block_count
add eax,esi
mov [block_ofs],eax
mov [bit_count],8
mov eax,1
shl eax,cl
mov [CC],eax
inc eax
mov [EOI],eax
lea ecx,[eax-1]
mov eax, _null shl 16
filltable:
stosd
inc eax
loop filltable
pop edi
mov [img_start],edi
reinit:
mov edx,[EOI]
inc edx
push [codesize]
pop [compsize]
call Gif_get_sym
cmp eax,[CC]
je reinit
call Gif_output
cycle:
movzx ebx,ax
call Gif_get_sym
cmp eax,edx
jae notintable
cmp eax,[CC]
je reinit
cmp eax,[EOI]
je zend
call Gif_output
zadd:
push eax
mov eax,[table_ptr]
mov [eax+edx*4],ebx
pop eax
cmp edx,0xFFF
jae cycle
inc edx
bsr ebx,edx
cmp ebx,[compsize]
jne noinc
inc [compsize]
noinc:
jmp cycle
notintable:
push eax
mov eax,ebx
call Gif_output
push ebx
movzx eax,bx
call Gif_output
pop ebx eax
jmp zadd
er:
pop edi
jmp ex
zend:
; mov eax,[.cur_info] ; skip offset to next frame
; mov [eax],edi
mov [cur_info],edi
add esi,2
xchg esi,edi
nxt:
cmp byte[edi],0
jnz continue
inc edi
jmp nxt
continue:
; cmp byte[edi],0x3b ;read next frame
; jne nextblock
xor eax,eax
stosd
mov ecx,[img_count]
ex:
pop edi esi
ret
Gif_skipmap:
; in: ecx - image descriptor, esi - pointer to colormap
; out: edi - pointer to area after colormap
and ecx,111b
inc ecx ; color map size
mov ebx,1
shl ebx,cl
lea ebx,[ebx*2+ebx]
lea edi,[esi+ebx]
ret
Gif_get_sym:
mov ecx,[compsize]
push ecx
xor eax,eax
shift:
ror byte[esi],1
rcr eax,1
dec [bit_count]
jnz loop1
inc esi
cmp esi,[block_ofs]
jb noblock
push eax
xor eax,eax
lodsb
test eax,eax
jnz nextbl
mov eax,[EOI]
sub esi,2
add esp,8
jmp exx
nextbl:
add eax,esi
mov [block_ofs],eax
pop eax
noblock:
mov [bit_count],8
loop1:
loop shift
pop ecx
rol eax,cl
exx:
xor ecx,ecx
ret
Gif_output:
push esi eax edx
mov edx,[table_ptr]
next:
push word[edx+eax*4]
mov ax,word[edx+eax*4+2]
inc ecx
cmp ax,_null
jnz next
shl ebx,16
mov bx,[esp]
loop2:
pop ax
lea esi,[eax+eax*2]
add esi,[Palette]
if COLOR_ORDER eq MENUETOS
mov esi,[esi]
bswap esi
shr esi,8
mov [edi],esi
add edi,3
else
movsw
movsb
end if
loop loop2
pop edx eax esi
ret
globalColor dd 1
img_count dd 1
cur_info dd 1 ; image table pointer
img_start dd 1
codesize dd 1
compsize dd 1
bit_count dd 1
CC dd 1
EOI dd 1
Palette dd 1
block_ofs dd 1
table_ptr dd 1
gifmacend:
}