;;================================================================================================;;
;;//// xbm.asm //// (c) dunkaist, 2013 ///////////////////////////////////////////////////////////;;
;;================================================================================================;;
;; ;;
;; This file is part of Common development libraries (Libs-Dev). ;;
;; ;;
;; Libs-Dev is free software: you can redistribute it and/or modify it under the terms of the GNU ;;
;; Lesser General Public License as published by the Free Software Foundation, either version 2.1 ;;
;; of the License, or (at your option) any later version. ;;
;; ;;
;; Libs-Dev is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without ;;
;; even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;;
;; Lesser General Public License for more details. ;;
;; ;;
;; You should have received a copy of the GNU Lesser General Public License along with Libs-Dev. ;;
;; If not, see <http://www.gnu.org/licenses/>. ;;
;; ;;
;;================================================================================================;;
;;================================================================================================;;
proc img.is.xbm _data, _length ;//////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Determine if raw data could be decoded (is in xbm format) ;;
;;------------------------------------------------------------------------------------------------;;
;> _data = raw data as read from file/stream ;;
;> _length = data length ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true ;;
;;================================================================================================;;
push ebx ecx esi edi
xor eax, eax
mov edi, [_data]
mov ecx, 4 ; BOM
mov al, '#'
repne scasb
jne .is_not_xbm
dec edi
mov esi, str_define
mov ecx, str_define.size
repe cmpsb
jne .is_not_xbm
mov esi, edi
call xbm._.skip_whitespace
mov edx, esi
call xbm._.wait_whitespace
mov ebx, esi
sub ebx, edx
sub ebx, 5
cmp word[esi - 6], '_w'
jne .is_not_xbm
cmp dword[esi - 4], 'idth'
jne .is_not_xbm
call xbm._.skip_whitespace
call xbm._.wait_whitespace
call xbm._.skip_whitespace
mov edi, str_define
mov ecx, str_define.size
repe cmpsb
jne .is_not_xbm
call xbm._.skip_whitespace
mov edi, edx
mov ecx, ebx
repe cmpsb
jne .is_not_xbm
cmp dword[esi], 'heig'
jne .is_not_xbm
cmp word[esi + 4], 'ht'
jne .is_not_xbm
.is_xbm:
pop edi esi ecx ebx
xor eax, eax
inc eax
ret
.is_not_xbm:
pop edi esi ecx ebx
xor eax, eax
ret
endp
;;================================================================================================;;
proc img.decode.xbm _data, _length, _options ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Decode data into image if it contains correctly formed raw data in xbm format ;;
;;------------------------------------------------------------------------------------------------;;
;> _data = raw data as read from file/stream ;;
;> _length = data length ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 (error) or pointer to image ;;
;;================================================================================================;;
locals
width rd 1
height rd 1
counter rd 1
retvalue rd 1 ; 0 (error) or pointer to image
endl
pusha
mov esi, [_data]
add esi, 5
call xbm._.wait_whitespace
call xbm._.skip_whitespace
call xbm._.wait_whitespace
call xbm._.skip_whitespace
call xbm._.read_number
mov [width], eax
call xbm._.skip_whitespace
call xbm._.wait_whitespace
call xbm._.skip_whitespace
call xbm._.wait_whitespace
call xbm._.skip_whitespace
call xbm._.read_number
mov [height], eax
stdcall img.create, [width], [height], Image.bpp1
test eax, eax
jz .quit
mov [retvalue], eax
mov edi, [_data]
mov ecx, [_length]
mov eax, '{'
repne scasb
mov esi, edi
mov ebx, [retvalue]
mov eax, [ebx + Image.Palette]
mov dword[eax], 0xffffffff
mov dword[eax + 4], 0xff000000
mov ecx, [ebx + Image.Width]
add ecx, 7
shr ecx, 3
imul ecx, [ebx + Image.Height]
mov [counter], ecx
mov edi, [ebx + Image.Data]
@@:
call xbm._.skip_whitespace
call xbm._.read_number
mov cl, al
and eax, 0x0f
mov al, byte[reverse_bits + eax]
shl eax, 4
mov edx, eax
mov al, cl
shr eax, 4
mov al, byte[reverse_bits + eax]
or eax, edx
mov byte[edi], al
add edi, 1
sub [counter], 1
jnz @b
.quit:
popa
mov eax, [retvalue]
ret
endp
;;================================================================================================;;
proc img.encode.xbm _img, _common, _specific ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Encode image into raw data in xbm format ;;
;;------------------------------------------------------------------------------------------------;;
;> [_img] = pointer to image ;;
;> [_common] = format independent options ;;
;> [_specific] = 0 / pointer to the structure of format specific options ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 / pointer to encoded data ;;
;< ecx = error code / the size of encoded data ;;
;;================================================================================================;;
xor eax, eax
ret
endp
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below are private procs you should never call directly from your code ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
proc xbm._.skip_whitespace
.next_byte:
movzx eax, byte[esi]
cmp eax, 0x20
jne @f
add esi, 1
jmp .next_byte
@@:
cmp eax, 0x09
jne @f
add esi, 1
jmp .next_byte
@@:
cmp eax, 0x0a
jne @f
add esi, 1
jmp .next_byte
@@:
ret
endp
proc xbm._.wait_whitespace
@@:
movzx eax, byte[esi]
cmp eax, 0x20
je @f
cmp eax, 0x09
je @f
cmp eax, 0x0a
je @f
add esi, 1
jmp @b
@@:
ret
endp
proc xbm._.read_number
xor eax, eax
mov ecx, eax
mov al, byte[esi]
add esi, 1
sub al, 0x30
test al, al
jz .octal_or_hex
.decimal:
mov ebx, 10
imul ecx, ebx
add ecx, eax
mov al, byte[esi]
add esi, 1
sub al, 0x30
cmp al, 10
jb .decimal
jmp .done
.octal_or_hex:
mov al, byte[esi]
add esi, 1
sub al, 0x30
cmp al, 'x' - 0x30
je .hex
.octal:
jmp .done
.hex:
mov al, byte[esi]
add esi, 1
sub al, 0x30
jc .done
cmp al, 9
jna @f
sub al, 0x30 - 9
jc .done
cmp al, 15
ja .done
@@:
shl ecx, 4
add ecx, eax
jmp .hex
.done:
mov eax, ecx
ret
endp
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below is private data you should never use directly from your code ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
reverse_bits db 0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e, 0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
sz str_define , '#define'
sz str__width , '_width'
sz str__height , '_height'