forked from KolibriOS/kolibrios
562 lines
19 KiB
NASM
562 lines
19 KiB
NASM
;;================================================================================================;;
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;;//// gif.asm //// (c) mike.dld, 2007-2008 //////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;;//// Partial (c) by Willow, Diamond and HidnPlayr //////////////////////////////////////////////;;
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;;================================================================================================;;
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;; ;;
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;; This file is part of Common development libraries (Libs-Dev). ;;
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;; ;;
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;; Libs-Dev is free software: you can redistribute it and/or modify it under the terms of the GNU ;;
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;; Lesser General Public License as published by the Free Software Foundation, either version 2.1 ;;
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;; of the License, or (at your option) any later version. ;;
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;; ;;
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;; Libs-Dev is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without ;;
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;; even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;;
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;; Lesser General Public License for more details. ;;
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;; ;;
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;; You should have received a copy of the GNU Lesser General Public License along with Libs-Dev. ;;
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;; If not, see <http://www.gnu.org/licenses/>. ;;
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;; ;;
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;;================================================================================================;;
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;; ;;
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;; References: ;;
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;; 1. GIF LITE v3.0 (2004-2007) ;;
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;; by Willow and Diamond ;;
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;; svn://kolibrios.org/programs/media/gifview/trunk/gif_lite.inc ;;
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;; 2. "GIF File Format Summary" ;;
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;; from "Encyclopedia of Graphics File Formats" by O'Reilly ;;
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;; http://www.fileformat.info/format/gif/ ;;
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;; 3. "LZW and GIF explained" (1987) ;;
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;; by Steve Blackstock, IEEE ;;
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;; http://www.cis.udel.edu/~amer/CISC651/lzw.and.gif.explained.html ;;
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;; 4. "Graphics Interchange Format (tm)" (June 15, 1987) ;;
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;; by CompuServe Incorporated ;;
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;; http://examples.oreilly.de/english_examples/gff/CDROM/GFF/VENDSPEC/GIF/GIF87A.TXT ;;
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;; 5. "Graphics Interchange Format (sm)" (July 31, 1990) ;;
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;; by CompuServe Incorporated ;;
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;; http://examples.oreilly.de/english_examples/gff/CDROM/GFF/VENDSPEC/GIF/GIF89A.TXT ;;
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;; ;;
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;;================================================================================================;;
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include 'gif.inc'
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;;================================================================================================;;
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proc img.is.gif _data, _length ;//////////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Determine if raw data could be decoded (is in GIF format) ;;
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;;------------------------------------------------------------------------------------------------;;
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;> _data = raw data as read from file/stream ;;
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;> _length = data length ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = false / true ;;
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;;================================================================================================;;
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cmp [_length], 6
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jb .nope
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mov eax, [_data]
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cmp dword[eax], 'GIF8'
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jne .nope
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cmp word[eax + 4], '7a'
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je .yep
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cmp word[eax + 4], '9a'
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je .yep
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.nope:
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xor eax, eax
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ret
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.yep:
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xor eax, eax
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inc eax
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ret
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endp
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;;================================================================================================;;
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proc img.decode.gif _data, _length ;//////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Decode data into image if it contains correctly formed raw data in GIF format ;;
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;;------------------------------------------------------------------------------------------------;;
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;> _data = raw data as read from file/stream ;;
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;> _length = data length ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = 0 (error) or pointer to image ;;
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;;================================================================================================;;
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locals
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img dd ?
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global_color_table dd ?
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global_color_table_size dd ?
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endl
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push ebx
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; img.is.gif is called by caller (img.decode)
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; stdcall img.is.gif, [_data], [_length]
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; or eax, eax
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; jz .error
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mov [global_color_table_size], 0
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mov ebx, [_data]
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test [ebx + gif.Header.lsd.Packed], gif.LSD.Packed.GlobalColorTableFlag
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jz @f
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lea eax, [ebx + sizeof.gif.Header]
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mov [global_color_table], eax
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mov cl, [ebx + gif.Header.lsd.Packed]
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and cl, gif.LSD.Packed.SizeOfGlobalColorTableMask
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shr cl, gif.LSD.Packed.SizeOfGlobalColorTableShift
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mov eax, 2
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shl eax, cl
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mov [global_color_table_size], eax
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lea eax, [eax * 3]
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add ebx, eax
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@@: add ebx, sizeof.gif.Header
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mov [img], 0
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; @@: cmp byte[ebx + gif.Block.Introducer], gif.Block.Introducer.Extension
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; jne .next_image
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; cmp byte[ebx + gif.Extension.Label], gif.Extension.Label.Comment
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; jne .error
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; add ebx, sizeof.gif.Extension
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; stdcall ._.skip_data
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; mov ebx, eax
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; jmp @b
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.next_image:
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stdcall img._.new
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or eax, eax
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jz .error
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mov edx, [img]
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mov [eax + Image.Previous], edx
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test edx, edx
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jz @f
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mov [edx + Image.Next], eax
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@@:
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mov [img], eax
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mov edx, eax
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mov [eax + Image.Type], Image.bpp8
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invoke mem.alloc, sizeof.gif.Image
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or eax, eax
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jz .error
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mov [edx + Image.Extended], eax
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stdcall ._.process_extensions
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cmp byte[ebx + gif.Block.Introducer], gif.Block.Introducer.ImageDescriptor
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jne .error
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movzx eax, [ebx + gif.ImageDescriptor.Width]
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movzx ecx, [ebx + gif.ImageDescriptor.Height]
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stdcall img._.resize_data, [img], eax, ecx
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or eax, eax
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jz .error
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mov esi, ebx
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mov edi, [edx + Image.Extended]
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mov ecx, sizeof.gif.ImageDescriptor
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rep movsb
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mov edi, [edx + Image.Palette]
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mov esi, [global_color_table]
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mov ecx, [global_color_table_size]
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test [ebx + gif.ImageDescriptor.Packed], gif.ID.Packed.LocalColorTableFlag
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jz @f
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lea esi, [ebx + sizeof.gif.ImageDescriptor]
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mov cl, [ebx + gif.ImageDescriptor.Packed]
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and cl, gif.ID.Packed.SizeOfLocalColorTableMask
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shr cl, gif.ID.Packed.SizeOfLocalColorTableShift
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mov eax, 2
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shl eax, cl
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mov ecx, eax
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lea eax, [eax*3]
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add ebx, eax
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@@:
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lodsd
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dec esi
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bswap eax
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shr eax, 8
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stosd
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loop @b
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add ebx, sizeof.gif.ImageDescriptor
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stdcall ._.process_image
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.decoded:
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or eax, eax
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jz @f
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stdcall img.destroy, [img]
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jmp .error
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@@: mov eax, [img]
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ret
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.error:
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mov eax, [img]
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test eax, eax
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jz @f
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stdcall img.destroy, eax
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@@:
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xor eax, eax
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pop ebx
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ret
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endp
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;;================================================================================================;;
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proc img.encode.gif _img, _p_length ;/////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Encode image into raw data in GIF format ;;
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;;------------------------------------------------------------------------------------------------;;
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;> _img = pointer to image ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = 0 (error) or pointer to encoded data ;;
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;< _p_length = encoded data length ;;
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;;================================================================================================;;
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xor eax, eax
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ret
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endp
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;! Below are private procs you should never call directly from your code ;;
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;;================================================================================================;;
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proc img.decode.gif._.skip_data ;/////////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? --- TBD --- ;;
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;;------------------------------------------------------------------------------------------------;;
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;> ebx = pointer to data blocks array ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = pointer to data right after data blocks array ;;
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;;================================================================================================;;
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push ecx
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xor ecx, ecx
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@@: mov cl, [esi]
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or cl, cl
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jz @f
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lea esi, [esi + ecx + 1]
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jmp @b
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@@: pop ecx
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ret
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endp
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;;================================================================================================;;
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proc img.decode.gif._.process_extensions ;////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? --- TBD --- ;;
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;;------------------------------------------------------------------------------------------------;;
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;> ebx = raw image data ;;
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;> edx = image data ;;
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;;------------------------------------------------------------------------------------------------;;
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;< --- TBD --- ;;
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;;================================================================================================;;
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push edx
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mov esi, ebx
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.next_block:
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mov al, [esi + gif.Block.Introducer]
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cmp al, gif.Block.Introducer.Extension
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je .ext_block
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; cmp al, gif.Block.Introducer.ImageDescriptor
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; je .exit
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; cmp al, gif.Block.Introducer.EndOfFile
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; je .exit
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jmp .exit
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.ext_block:
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mov al, [esi + gif.Extension.Label]
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cmp al, gif.Extension.Label.PlainText
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je .plain_text_ext
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cmp al, gif.Extension.Label.GraphicsControl
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je .graphics_control_ext
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cmp al, gif.Extension.Label.Comment
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je .comment_ext
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cmp al, gif.Extension.Label.Application
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je .application_ext
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jmp .exit
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.plain_text_ext:
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add esi, gif.PlainTextExtension.PlainTextData
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stdcall img.decode.gif._.skip_data
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jmp .next_ext_block
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.graphics_control_ext:
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push edi
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mov edi, [edx + Image.Extended]
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add edi, gif.Image.gce
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mov ecx, sizeof.gif.GraphicsControlExtension
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rep movsb
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pop edi
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jmp .next_ext_block
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.comment_ext:
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add esi, gif.CommentExtension.CommentData
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stdcall img.decode.gif._.skip_data
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jmp .next_ext_block
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.application_ext:
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add esi, gif.ApplicationExtension.ApplicationData
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stdcall img.decode.gif._.skip_data
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jmp .next_ext_block
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.next_ext_block:
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mov al, [esi + gif.Block.Introducer]
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cmp al, gif.Block.Introducer.EndOfData
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jne .exit
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inc esi
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jmp .next_block
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.exit:
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mov ebx, esi
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pop edx
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ret
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endp
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;;================================================================================================;;
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proc img.decode.gif._.process_image ;/////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? --- TBD --- ;;
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;;------------------------------------------------------------------------------------------------;;
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;> ebx = raw image data ;;
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;> edx = image data ;;
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;;------------------------------------------------------------------------------------------------;;
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;< --- TBD --- ;;
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;;================================================================================================;;
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locals
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width dd ?
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img_start dd ?
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img_end dd ?
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row_end dd ?
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pass dd ?
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codesize dd ?
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compsize dd ?
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workarea dd ?
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block_ofs dd ?
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bit_count dd ?
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CC dd ?
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EOI dd ?
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endl
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invoke mem.alloc, 16 * 1024
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mov [workarea], eax
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or eax, eax
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jz .error
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mov ecx, [edx + Image.Width]
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mov [width], ecx
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mov eax, [edx + Image.Height]
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imul eax, ecx
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mov [img_end], eax
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inc eax
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mov [row_end], eax
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and [pass], 0
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mov eax, [edx + Image.Extended]
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test [eax + gif.Image.info.Packed], gif.ID.Packed.InterleaceFlag
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jz @f
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mov [row_end], ecx
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@@: mov esi, ebx
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mov edi, [edx + Image.Data]
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push edi
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movzx ecx, byte[esi]
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inc esi
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mov [codesize], ecx
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inc [codesize]
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mov edi, [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, gif.Null 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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mov [img_start], edi
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add [img_end], edi
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add [row_end], 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 .get_symbol
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cmp eax, [CC]
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je .reinit
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call .output
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.cycle:
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movzx ebx, ax
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call .get_symbol
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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 .output
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.add:
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mov ecx, [workarea]
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mov [ecx + edx * 4], ebx
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cmp edx, 0x00000FFF
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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 .output
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push ebx
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movzx eax, bx
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call .output
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pop ebx eax
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jmp .add
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.end:
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mov edi, [img_end]
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xor eax, eax
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.exit:
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cmp [workarea], 0
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je @f
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invoke mem.free, [workarea]
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@@: xor eax, eax
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ret
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.error:
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cmp [workarea], 0
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je @f
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invoke mem.free, [workarea]
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@@: xor eax, eax
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inc eax
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ret
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;;------------------------------------------------------------------------------------------------;;
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img.decode.gif._.process_image.get_symbol:
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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 .exit
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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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.exit:
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xor ecx, ecx
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retn
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;;------------------------------------------------------------------------------------------------;;
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img.decode.gif._.process_image.output:
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push esi eax edx
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mov edx, [workarea]
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.next:
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pushw [edx + eax * 4]
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mov ax, [edx + eax * 4 + 2]
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inc ecx
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cmp ax, gif.Null
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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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stosb
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cmp edi, [row_end]
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jb .norowend
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mov eax, [width]
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push eax
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sub edi, eax
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add eax, eax
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cmp [pass], 3
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je @f
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add eax, eax
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cmp [pass], 2
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je @f
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add eax, eax
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@@: add edi, eax
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pop eax
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cmp edi, [img_end]
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jb .nextrow
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mov edi, [img_start]
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inc [pass]
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add edi, eax
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cmp [pass], 3
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je @f
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add edi, eax
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cmp [pass], 2
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je @f
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add edi, eax
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add edi, eax
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@@:
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.nextrow:
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add eax, edi
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mov [row_end], eax
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xor eax, eax
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.norowend:
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loop .loop2
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pop edx eax esi
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retn
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endp
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;! Below is private data you should never use directly from your code ;;
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;;================================================================================================;;
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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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;;================================================================================================;;
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;
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