211 lines
4.0 KiB
PHP
211 lines
4.0 KiB
PHP
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uglobal
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align 4
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ReadGIF.globalColor dd ?
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ReadGIF.cur_info dd ? ; image table pointer
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ReadGIF.codesize dd ?
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ReadGIF.compsize dd ?
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ReadGIF.bit_count dd ?
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ReadGIF.CC dd ?
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ReadGIF.EOI dd ?
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ReadGIF.Palette dd ?
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ReadGIF.block_ofs dd ?
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ReadGIF.gif_workarea rb 16*1024
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endg
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; unpacks GIF image
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ReadGIF:
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; in:
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; esi - pointer to GIF file in memory
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; edi - pointer to output image list
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; out:
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; eax=0 -> ok, eax=1 -> invalid signature
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; eax>=8 -> unsupported image attributes
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push esi edi
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mov [.cur_info],edi
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xor eax,eax
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mov [.globalColor],eax
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inc eax
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cmp dword[esi],'GIF8'
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jne .ex ; signature
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mov ecx,[esi+0xa]
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add esi,0xd
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mov edi,esi
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test cl,cl
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jns .nextblock
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mov [.globalColor],esi
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call .Gif_skipmap
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.nextblock:
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cmp byte[edi],0x21
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jne .noextblock
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inc edi
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inc edi
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.block_skip:
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movzx eax,byte[edi]
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lea edi,[edi+eax+1]
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test eax,eax
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jnz .block_skip
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jmp .nextblock
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.noextblock:
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mov al,8
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cmp byte[edi],0x2c ; image beginning
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jne .ex
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inc edi
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mov esi,[.cur_info]
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xchg esi,edi
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movzx eax,word[esi+4]
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stosd
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movzx eax,word[esi+6]
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stosd
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add esi,8
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push edi
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mov ecx,[esi]
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inc esi
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test cl,cl
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js .uselocal
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push [.globalColor]
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mov edi,esi
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jmp .setPal
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.uselocal:
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call .Gif_skipmap
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push esi
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.setPal:
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movzx ecx,byte[edi]
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inc ecx
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mov [.codesize],ecx
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dec ecx
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pop [.Palette]
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lea esi,[edi+1]
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mov edi,.gif_workarea
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xor eax,eax
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lodsb ; eax - block_count
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add eax,esi
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mov [.block_ofs],eax
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mov [.bit_count],8
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mov eax,1
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shl eax,cl
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mov [.CC],eax
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mov ecx,eax
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inc eax
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mov [.EOI],eax
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mov eax, 1000h shl 16
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.filltable:
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stosd
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inc eax
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loop .filltable
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pop edi
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.reinit:
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mov edx,[.EOI]
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inc edx
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push [.codesize]
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pop [.compsize]
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call .Gif_get_sym
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cmp eax,[.CC]
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je .reinit
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call .Gif_output
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.cycle:
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movzx ebx,ax
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call .Gif_get_sym
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cmp eax,edx
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jae .notintable
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cmp eax,[.CC]
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je .reinit
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cmp eax,[.EOI]
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je .end
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call .Gif_output
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.add:
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mov dword [.gif_workarea+edx*4],ebx
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cmp edx,0xFFF
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jae .cycle
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inc edx
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bsr ebx,edx
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cmp ebx,[.compsize]
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jne .noinc
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inc [.compsize]
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.noinc:
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jmp .cycle
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.notintable:
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push eax
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mov eax,ebx
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call .Gif_output
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push ebx
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movzx eax,bx
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call .Gif_output
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pop ebx eax
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jmp .add
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.end:
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xor eax,eax
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.ex:
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pop edi esi
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ret
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.Gif_skipmap:
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; in: ecx - image descriptor, esi - pointer to colormap
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; out: edi - pointer to area after colormap
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and ecx,111b
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inc ecx ; color map size
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mov ebx,1
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shl ebx,cl
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lea ebx,[ebx*2+ebx]
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lea edi,[esi+ebx]
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ret
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.Gif_get_sym:
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mov ecx,[.compsize]
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push ecx
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xor eax,eax
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.shift:
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ror byte[esi],1
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rcr eax,1
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dec [.bit_count]
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jnz .loop1
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inc esi
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cmp esi,[.block_ofs]
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jb .noblock
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push eax
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xor eax,eax
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lodsb
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test eax,eax
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jnz .nextbl
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mov eax,[.EOI]
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sub esi,2
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add esp,8
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jmp .exx
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.nextbl:
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add eax,esi
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mov [.block_ofs],eax
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pop eax
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.noblock:
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mov [.bit_count],8
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.loop1:
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loop .shift
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pop ecx
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rol eax,cl
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.exx:
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xor ecx,ecx
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ret
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.Gif_output:
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push esi eax edx
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mov edx,.gif_workarea
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.next:
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push word[edx+eax*4]
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mov ax,word[edx+eax*4+2]
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inc ecx
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cmp ax,1000h
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jnz .next
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shl ebx,16
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mov bx,[esp]
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.loop2:
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pop ax
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lea esi,[eax+eax*2]
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add esi,[.Palette]
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mov esi,[esi]
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bswap esi
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shr esi,8
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mov [edi],esi
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add edi,3
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loop .loop2
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pop edx eax esi
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ret
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