195 lines
3.3 KiB
Plaintext
195 lines
3.3 KiB
Plaintext
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virtual at buffer
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GIFHEADER:
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.ID dd ?
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.ver dw ?
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.width dw ?
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.height dw ?
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.bits db ?
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.background db ?
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.reserved db ?
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.length = $ - GIFHEADER
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end virtual
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load_picture:
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invoke CreateFileA,esi,GENERIC_READ,0,0,OPEN_EXISTING,0,0
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mov edi,eax
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invoke ReadFile,edi,GIFHEADER,40000h,bytes_count,0
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invoke CloseHandle,edi
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cmp [GIFHEADER.ID],'GIF8'
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jne picture_error
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cmp [GIFHEADER.ver],'7a'
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jne picture_error
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mov al,[GIFHEADER.bits]
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and al,10000111b
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cmp al,10000111b
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jne picture_error
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add [bytes_count],buffer
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mov esi,buffer+GIFHEADER.length+256*3
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mov edi,esi
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xor eax,eax
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find_image:
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cmp esi,[bytes_count]
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jae picture_error
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lodsb
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cmp al,','
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je image_found
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cmp al,'!'
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jne picture_error
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inc esi
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skip_application_data:
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lodsb
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add esi,eax
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or al,al
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jnz skip_application_data
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jmp find_image
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image_found:
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add esi,4
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xor eax,eax
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lodsw
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mov ebx,eax
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lodsw
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inc esi
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cmp byte [esi],8
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jne picture_error
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inc esi
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mov [ddsd.dwSize],sizeof.DDSURFACEDESC
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mov [ddsd.dwFlags],DDSD_CAPS+DDSD_WIDTH+DDSD_HEIGHT+DDSD_CKSRCBLT
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mov [ddsd.ddsCaps.dwCaps],DDSCAPS_OFFSCREENPLAIN+DDSCAPS_SYSTEMMEMORY
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mov [ddsd.dwWidth],ebx
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mov [ddsd.dwHeight],eax
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movzx eax,[GIFHEADER.background]
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mov [ddsd.ddckCKSrcBlt.dwColorSpaceLowValue],eax
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mov [ddsd.ddckCKSrcBlt.dwColorSpaceHighValue],eax
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cominvk DDraw,CreateSurface,\
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ddsd,DDSPicture,0
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or eax,eax
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jnz picture_error
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cominvk DDSPicture,Lock,\
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0,ddsd,DDLOCK_WAIT,0
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mov edi,esi
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mov edx,esi
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mov ebx,buffer
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add ebx,[bytes_count]
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link_streams:
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cmp esi,[bytes_count]
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jae picture_error
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lodsb
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movzx ecx,al
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rep movsb
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or al,al
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jnz link_streams
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mov edi,[ddsd.lpSurface]
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mov ebx,edx
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mov [LZW_bits],0
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LZW_clear:
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xor edx,edx
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LZW_decompress_loop:
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mov ch,9
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cmp edx,(100h-2)*8
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jbe LZW_read_bits
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mov ch,10
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cmp edx,(300h-2)*8
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jbe LZW_read_bits
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mov ch,11
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cmp edx,(700h-2)*8
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jbe LZW_read_bits
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mov ch,12
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LZW_read_bits:
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mov cl,[LZW_bits]
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mov eax,[ebx]
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shr eax,cl
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xchg cl,ch
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mov esi,1
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shl esi,cl
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dec esi
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and eax,esi
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add cl,ch
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LZW_read_bits_count:
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cmp cl,8
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jbe LZW_read_bits_ok
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sub cl,8
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inc ebx
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jmp LZW_read_bits_count
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LZW_read_bits_ok:
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mov [LZW_bits],cl
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cmp eax,100h
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jb LZW_single_byte
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je LZW_clear
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sub eax,102h
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jc LZW_end
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shl eax,3
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cmp eax,edx
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ja picture_error
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mov ecx,[LZW_table+eax]
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mov esi,[LZW_table+eax+4]
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mov [LZW_table+edx+4],edi
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rep movsb
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mov eax,[LZW_table+eax]
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inc eax
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mov [LZW_table+edx],eax
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jmp LZW_decompress_next
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LZW_single_byte:
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mov [LZW_table+edx],2
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mov [LZW_table+edx+4],edi
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stosb
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LZW_decompress_next:
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add edx,8
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jmp LZW_decompress_loop
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LZW_end:
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cominvk DDSPicture,Unlock,0
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mov eax,[DDSPicture]
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clc
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ret
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picture_error:
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stc
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ret
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load_palette:
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invoke CreateFileA,esi,GENERIC_READ,0,0,OPEN_EXISTING,0,0
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mov edi,eax
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invoke ReadFile,edi,buffer,GIFHEADER.length+256*3,bytes_count,0
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cmp [bytes_count],GIFHEADER.length+256*3
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jne picture_error
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invoke CloseHandle,edi
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cmp [GIFHEADER.ID],'GIF8'
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jne picture_error
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cmp [GIFHEADER.ver],'7a'
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jne picture_error
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mov al,[GIFHEADER.bits]
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and al,111b
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cmp al,111b
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jne picture_error
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mov esi,buffer+GIFHEADER.length
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mov edi,buffer+400h
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mov ecx,256
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convert_palette:
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movsw
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movsb
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xor al,al
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stosb
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loop convert_palette
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cominvk DDraw,CreatePalette,\
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DDPCAPS_8BIT+DDPCAPS_ALLOW256,buffer+400h,DDPalette,0
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or eax,eax
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jnz picture_error
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clc
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ret
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