281 lines
11 KiB
NASM
281 lines
11 KiB
NASM
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;;================================================================================================;;
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;;//// xbm.asm //// (c) dunkaist, 2013 ///////////////////////////////////////////////////////////;;
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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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proc img.is.xbm _data, _length ;//////////////////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Determine if raw data could be decoded (is in xbm 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 ebx ecx esi edi
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xor eax, eax
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mov edi, [_data]
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mov ecx, 4 ; BOM
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mov al, '#'
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repne scasb
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jne .is_not_xbm
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dec edi
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mov esi, str_define
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mov ecx, str_define.size
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repe cmpsb
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jne .is_not_xbm
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mov esi, edi
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call xbm._.skip_whitespace
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mov edx, esi
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call xbm._.wait_whitespace
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mov ebx, esi
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sub ebx, edx
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sub ebx, 5
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cmp word[esi - 6], '_w'
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jne .is_not_xbm
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cmp dword[esi - 4], 'idth'
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jne .is_not_xbm
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call xbm._.skip_whitespace
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call xbm._.wait_whitespace
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call xbm._.skip_whitespace
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mov edi, str_define
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mov ecx, str_define.size
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repe cmpsb
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jne .is_not_xbm
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call xbm._.skip_whitespace
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mov edi, edx
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mov ecx, ebx
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repe cmpsb
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jne .is_not_xbm
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cmp dword[esi], 'heig'
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jne .is_not_xbm
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cmp word[esi + 4], 'ht'
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jne .is_not_xbm
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.is_xbm:
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pop edi esi ecx ebx
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xor eax, eax
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inc eax
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ret
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.is_not_xbm:
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pop edi esi ecx ebx
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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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proc img.decode.xbm _data, _length, _options ;////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Decode data into image if it contains correctly formed raw data in xbm 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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width rd 1
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height rd 1
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counter rd 1
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retvalue rd 1 ; 0 (error) or pointer to image
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endl
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pusha
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mov esi, [_data]
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add esi, 5
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call xbm._.wait_whitespace
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call xbm._.skip_whitespace
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call xbm._.wait_whitespace
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call xbm._.skip_whitespace
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call xbm._.read_number
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mov [width], eax
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call xbm._.skip_whitespace
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call xbm._.wait_whitespace
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call xbm._.skip_whitespace
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call xbm._.wait_whitespace
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call xbm._.skip_whitespace
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call xbm._.read_number
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mov [height], eax
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stdcall img.create, [width], [height], Image.bpp1
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test eax, eax
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jz .quit
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mov [retvalue], eax
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mov edi, [_data]
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mov ecx, [_length]
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mov eax, '{'
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repne scasb
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mov esi, edi
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mov ebx, [retvalue]
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mov eax, [ebx + Image.Palette]
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mov dword[eax], 0xffffffff
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mov dword[eax + 4], 0xff000000
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mov ecx, [ebx + Image.Width]
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add ecx, 7
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shr ecx, 3
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imul ecx, [ebx + Image.Height]
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mov [counter], ecx
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mov edi, [ebx + Image.Data]
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@@:
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call xbm._.skip_whitespace
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call xbm._.read_number
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mov cl, al
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and eax, 0x0f
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mov al, byte[reverse_bits + eax]
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shl eax, 4
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mov edx, eax
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mov al, cl
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shr eax, 4
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mov al, byte[reverse_bits + eax]
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or eax, edx
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mov byte[edi], al
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add edi, 1
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sub [counter], 1
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jnz @b
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.quit:
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popa
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mov eax, [retvalue]
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ret
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endp
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;;================================================================================================;;
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proc img.encode.xbm _img, _common, _specific ;////////////////////////////////////////////////////;;
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;;------------------------------------------------------------------------------------------------;;
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;? Encode image into raw data in xbm format ;;
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;;------------------------------------------------------------------------------------------------;;
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;> [_img] = pointer to image ;;
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;> [_common] = format independent options ;;
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;> [_specific] = 0 / pointer to the structure of format specific options ;;
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;;------------------------------------------------------------------------------------------------;;
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;< eax = 0 / pointer to encoded data ;;
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;< ecx = error code / the size of encoded data ;;
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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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proc xbm._.skip_whitespace
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.next_byte:
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movzx eax, byte[esi]
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cmp eax, 0x20
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jne @f
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add esi, 1
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jmp .next_byte
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@@:
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cmp eax, 0x09
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jne @f
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add esi, 1
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jmp .next_byte
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@@:
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cmp eax, 0x0a
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jne @f
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add esi, 1
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jmp .next_byte
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@@:
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ret
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endp
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proc xbm._.wait_whitespace
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@@:
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movzx eax, byte[esi]
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cmp eax, 0x20
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je @f
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cmp eax, 0x09
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je @f
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cmp eax, 0x0a
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je @f
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add esi, 1
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jmp @b
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@@:
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ret
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endp
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proc xbm._.read_number
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xor eax, eax
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mov ecx, eax
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mov al, byte[esi]
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add esi, 1
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sub al, 0x30
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test al, al
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jz .octal_or_hex
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.decimal:
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mov ebx, 10
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imul ecx, ebx
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add ecx, eax
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mov al, byte[esi]
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add esi, 1
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sub al, 0x30
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cmp al, 10
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jb .decimal
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jmp .done
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.octal_or_hex:
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mov al, byte[esi]
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add esi, 1
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sub al, 0x30
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cmp al, 'x' - 0x30
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je .hex
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.octal:
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jmp .done
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.hex:
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mov al, byte[esi]
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add esi, 1
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sub al, 0x30
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jc .done
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cmp al, 9
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jna @f
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sub al, 0x30 - 9
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jc .done
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cmp al, 15
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ja .done
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@@:
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shl ecx, 4
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add ecx, eax
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jmp .hex
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.done:
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mov eax, ecx
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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 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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reverse_bits db 0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e, 0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
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sz str_define , '#define'
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sz str__width , '_width'
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sz str__height , '_height'
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