mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-27 16:59:41 +03:00
211 lines
4.0 KiB
PHP
211 lines
4.0 KiB
PHP
|
|
uglobal
|
|
align 4
|
|
ReadGIF.globalColor dd ?
|
|
ReadGIF.cur_info dd ? ; image table pointer
|
|
ReadGIF.codesize dd ?
|
|
ReadGIF.compsize dd ?
|
|
ReadGIF.bit_count dd ?
|
|
ReadGIF.CC dd ?
|
|
ReadGIF.EOI dd ?
|
|
ReadGIF.Palette dd ?
|
|
ReadGIF.block_ofs dd ?
|
|
ReadGIF.gif_workarea rb 16*1024
|
|
endg
|
|
|
|
; unpacks GIF image
|
|
ReadGIF:
|
|
; in:
|
|
; esi - pointer to GIF file in memory
|
|
; edi - pointer to output image list
|
|
; out:
|
|
; eax=0 -> ok, eax=1 -> invalid signature
|
|
; eax>=8 -> unsupported image attributes
|
|
push esi edi
|
|
mov [.cur_info],edi
|
|
xor eax,eax
|
|
mov [.globalColor],eax
|
|
inc eax
|
|
cmp dword[esi],'GIF8'
|
|
jne .ex ; signature
|
|
mov ecx,[esi+0xa]
|
|
add esi,0xd
|
|
mov edi,esi
|
|
test cl,cl
|
|
jns .nextblock
|
|
mov [.globalColor],esi
|
|
call .Gif_skipmap
|
|
.nextblock:
|
|
cmp byte[edi],0x21
|
|
jne .noextblock
|
|
inc edi
|
|
inc edi
|
|
.block_skip:
|
|
movzx eax,byte[edi]
|
|
lea edi,[edi+eax+1]
|
|
test eax,eax
|
|
jnz .block_skip
|
|
jmp .nextblock
|
|
.noextblock:
|
|
mov al,8
|
|
cmp byte[edi],0x2c ; image beginning
|
|
jne .ex
|
|
inc edi
|
|
mov esi,[.cur_info]
|
|
xchg esi,edi
|
|
movzx eax,word[esi+4]
|
|
stosd
|
|
movzx eax,word[esi+6]
|
|
stosd
|
|
add esi,8
|
|
push edi
|
|
mov ecx,[esi]
|
|
inc esi
|
|
test cl,cl
|
|
js .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,.gif_workarea
|
|
xor eax,eax
|
|
lodsb ; eax - block_count
|
|
add eax,esi
|
|
mov [.block_ofs],eax
|
|
mov [.bit_count],8
|
|
mov eax,1
|
|
shl eax,cl
|
|
mov [.CC],eax
|
|
mov ecx,eax
|
|
inc eax
|
|
mov [.EOI],eax
|
|
mov eax, 1000h shl 16
|
|
.filltable:
|
|
stosd
|
|
inc eax
|
|
loop .filltable
|
|
pop 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 .end
|
|
call .Gif_output
|
|
.add:
|
|
mov dword [.gif_workarea+edx*4],ebx
|
|
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 .add
|
|
.end:
|
|
xor eax,eax
|
|
.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,.gif_workarea
|
|
.next:
|
|
push word[edx+eax*4]
|
|
mov ax,word[edx+eax*4+2]
|
|
inc ecx
|
|
cmp ax,1000h
|
|
jnz .next
|
|
shl ebx,16
|
|
mov bx,[esp]
|
|
.loop2:
|
|
pop ax
|
|
lea esi,[eax+eax*2]
|
|
add esi,[.Palette]
|
|
mov esi,[esi]
|
|
bswap esi
|
|
shr esi,8
|
|
mov [edi],esi
|
|
add edi,3
|
|
loop .loop2
|
|
pop edx eax esi
|
|
ret
|