forked from KolibriOS/kolibrios
181 lines
8.6 KiB
NASM
181 lines
8.6 KiB
NASM
;;================================================================================================;;
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;;//// wbmp.asm //// (c) dunkaist, 2011-2012 /////////////////////////////////////////////////////;;
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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. WAP WAE Specification ;;
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;; http://www.wapforum.org/what/technical/SPEC-WAESpec-19990524.pdf ;;
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;; 2. "Converting a BMP picture to WBMP format" ;;
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;; by Sajjitha Gunawardana ;;
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;; http://www.codeproject.com/KB/graphics/bmp_to_wbmp_converter.aspx ;;
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;; ;;
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;;================================================================================================;;
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;include 'wbmp.inc' ; wbmp is too simple, so we do not need any *.inc files
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;;================================================================================================;;
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proc img.is.wbmp _data, _length ;/////////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Determine if raw data could be decoded (is in wbmp 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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push esi
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mov esi, [_data]
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lodsw
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test ax, ax ; two first bytes of any wbmp file are zeros, check this signature
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jnz .is_not_wbmp
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; but two byte signature is not enough to be sure it is wbmp file
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; let's calculate the whole image size and compare it with [_length]
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; calculate width first. you can read how this number is stored in wbmp format specification (see "References" above)
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xor eax, eax
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@@:
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shl eax, 7
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lodsb
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sal al, 1
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jc @b
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shr eax, 1
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add eax, 7
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shr eax, 3
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mov ecx, eax
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; calculate height
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xor eax, eax
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@@:
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shl eax, 7
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lodsb
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sal al, 1
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jc @b
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shr eax, 1
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imul eax, ecx ; image_size = width*height
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; raw file consists of a header and data. our image_size is the size of data only
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sub esi, [_data] ; get header size
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add eax, esi
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cmp eax, [_length]
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je .is_wbmp
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.is_not_wbmp: ; return 0
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pop esi
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xor eax, eax
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ret
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.is_wbmp: ; return 1
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pop esi
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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.wbmp _data, _length, _options ;///////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Decode data into image if it contains correctly formed raw data in wbmp 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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push ebx edx esi edi
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mov esi, [_data]
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lodsw
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xor eax, eax
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@@:
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shl eax, 7
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lodsb
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sal al, 1
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jc @b
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shr eax, 1
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mov ebx, eax
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xor eax, eax
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@@:
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shl eax, 7
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lodsb
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sal al, 1
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jc @b
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shr eax, 1
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mov edx, eax
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push ebx ecx edx
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stdcall img.create, ebx, edx, Image.bpp1
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pop edx ecx ebx
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test eax, eax
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jz .quit
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mov edi, [eax + Image.Palette]
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mov [edi], dword 0xff000000
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mov [edi + 4], dword 0xffffffff
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add ebx, 7
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shr ebx, 3
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imul ebx, edx
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mov ecx, ebx
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mov edi, [eax + Image.Data]
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rep movsb
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.quit:
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pop edi esi edx ebx
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ret
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endp
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;;================================================================================================;;
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proc img.encode.wbmp _img, _p_length, _options ;//////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Encode image into raw data in wbmp 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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;;////////////////////////////////////////////////////////////////////////////////////////////////;;
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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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