kolibrios/programs/testing/cpuid/trunk/gif_lite.inc
Kirill Lipatov (Leency) 0639ff9a42 more apps into testing folder
git-svn-id: svn://kolibrios.org@7900 a494cfbc-eb01-0410-851d-a64ba20cac60
2020-05-08 13:02:22 +00:00

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