;;================================================================================================;;
;;//// pnm.asm //// (c) dunkaist, 2012 ///////////////////////////////////////////////////////////;;
;;================================================================================================;;
;; ;;
;; 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/>. ;;
;; ;;
;;================================================================================================;;
include 'pnm.inc'
;;================================================================================================;;
proc img.is.pnm _data, _length ;//////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Determine if raw data could be decoded (is in pnm format) ;;
;;------------------------------------------------------------------------------------------------;;
;> _data = raw data as read from file/stream ;;
;> _length = data length ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true ;;
;;================================================================================================;;
xor eax, eax
mov ecx, [_data]
mov cx, word[ecx]
xchg cl, ch
cmp cx, '1P'
jb .is_not_pnm
cmp cx, '6P'
ja .is_not_pnm
.is_pnm:
inc eax
.is_not_pnm:
ret
endp
;;================================================================================================;;
proc img.decode.pnm _data, _length, _options ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Decode data into image if it contains correctly formed raw data in pnm 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
pnm_type rd 1
data_type rd 1 ; raw or ascii
maxval rd 1
retvalue rd 1
endl
pusha
mov esi, [_data]
lodsw
cmp ax, 'P1'
jne @f
mov [pnm_type], PNM_PBM
mov [data_type], PNM_ASCII
jmp .parse_header
@@:
cmp ax, 'P2'
jne @f
mov [pnm_type], PNM_PGM
mov [data_type], PNM_ASCII
jmp .parse_header
@@:
cmp ax, 'P3'
jne @f
mov [pnm_type], PNM_PPM
mov [data_type], PNM_ASCII
jmp .parse_header
@@:
cmp ax, 'P4'
jne @f
mov [pnm_type], PNM_PBM
mov [data_type], PNM_RAW
jmp .parse_header
@@:
cmp ax, 'P5'
jne @f
mov [pnm_type], PNM_PGM
mov [data_type], PNM_RAW
jmp .parse_header
@@:
cmp ax, 'P6'
jne @f
mov [pnm_type], PNM_PPM
mov [data_type], PNM_RAW
jmp .parse_header
@@:
.parse_header:
xor eax, eax
mov [width], eax
mov [height], eax
mov [maxval], eax
.next_char:
lodsb
cmp al, '#'
jb .next_char
ja .read_number
.comment:
mov edi, esi
mov al, 0x0A
mov ecx, edi
sub ecx, [_data]
neg ecx
add ecx, [_length]
repne scasb
mov esi, edi
jmp .next_char
.read_number:
sub eax, 0x30
mov ebx, eax
@@:
lodsb
cmp al, '0'
jb .number_done
sub eax, 0x30
imul ebx, 10
add ebx, eax
jmp @b
.number_done:
cmp [width], 0
jne @f
mov [width], ebx
jmp .next_char
@@:
cmp [height], 0
jne @f
mov [height], ebx
cmp [pnm_type], PNM_PBM
je .header_parsed
jmp .next_char
@@:
mov [maxval], ebx
.header_parsed:
cmp [data_type], PNM_RAW
jne @f
mov ecx, [width]
imul ecx, [height]
lea eax, [ecx*3]
mov edx, [_data]
add edx, [_length]
sub edx, esi
cmp eax, edx
ja .error
@@:
mov eax, [pnm_type]
cmp eax, PNM_PBM
je .pbm
cmp eax, PNM_PGM
je .pgm
cmp eax, PNM_PPM
je .ppm
jmp .quit
include 'pbm.asm'
include 'pgm.asm'
include 'ppm.asm'
.error:
popa
xor eax, eax
ret
.quit:
popa
mov eax, [retvalue]
ret
endp
;;================================================================================================;;
proc img.encode.pnm _img, _common, _specific ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Encode image into raw data in pnm 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 ;;
;;================================================================================================;;
locals
encoded_file rd 1
encoded_file_size rd 1
encoded_data_size rd 1
endl
push ebx
mov ebx, [_img]
mov eax, [ebx + Image.Type]
cmp eax, Image.bpp1
je .pbm
cmp eax, Image.bpp8g
je .pgm
cmp eax, Image.bpp24
je .ppm
mov ecx, LIBIMG_ERROR_BIT_DEPTH
jmp .error
.pbm:
mov ecx, [ebx + Image.Width]
add ecx, 7
shr ecx, 3
imul ecx, [ebx + Image.Height]
mov [encoded_data_size], ecx
add ecx, (2 + 1) + (2 + pnm._.creator_comment.size + 1) + (5 + 1 + 5 + 1) + (3 + 1)
mov [encoded_file_size], ecx
stdcall [mem.alloc], ecx
mov [encoded_file], eax
test eax, eax
jnz @f
mov ecx, LIBIMG_ERROR_OUT_OF_MEMORY
jmp .error
@@:
mov edi, eax
mov ax, 'P4'
call pnm._.write_header
mov esi, [ebx + Image.Data]
mov ecx, [encoded_data_size]
rep movsb
mov eax, [encoded_file]
mov ecx, [encoded_file_size]
jmp .quit
.pgm:
mov ecx, [ebx + Image.Width]
imul ecx, [ebx + Image.Height]
mov [encoded_data_size], ecx
add ecx, (2 + 1) + (2 + pnm._.creator_comment.size + 1) + (5 + 1 + 5 + 1) + (3 + 1)
mov [encoded_file_size], ecx
stdcall [mem.alloc], ecx
mov [encoded_file], eax
test eax, eax
jnz @f
mov ecx, LIBIMG_ERROR_OUT_OF_MEMORY
jmp .error
@@:
mov edi, eax
mov ax, 'P5'
call pnm._.write_header
mov dword[edi], '255 '
add edi, 3
mov byte[edi], 0x0A
add edi, 1
mov esi, [ebx + Image.Data]
mov ecx, [encoded_data_size]
rep movsb
mov eax, [encoded_file]
mov ecx, [encoded_file_size]
jmp .quit
.ppm:
mov ecx, [ebx + Image.Width]
imul ecx, [ebx + Image.Height]
lea ecx, [ecx*3]
mov [encoded_data_size], ecx
add ecx, (2 + 1) + (2 + pnm._.creator_comment.size + 1) + (5 + 1 + 5 + 1) + (3 + 1)
mov [encoded_file_size], ecx
stdcall [mem.alloc], ecx
mov [encoded_file], eax
test eax, eax
jnz @f
mov ecx, LIBIMG_ERROR_OUT_OF_MEMORY
jmp .error
@@:
mov edi, eax
mov ax, 'P6'
call pnm._.write_header
mov dword[edi], '255 '
add edi, 3
mov byte[edi], 0x0A
add edi, 1
mov esi, [ebx + Image.Data]
mov ecx, [ebx + Image.Width]
imul ecx, [ebx + Image.Height]
@@:
lodsb
mov byte[edi+2], al
lodsb
mov byte[edi+1], al
movsb
add edi, 2
dec ecx
jnz @b
mov eax, [encoded_file]
mov ecx, [encoded_file_size]
jmp .quit
.error:
xor eax, eax
.quit:
pop ebx
ret
endp
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below are private procs you should never call directly from your code ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
proc pnm._.get_number
sub eax, '0'
mov ebx, eax
@@:
lodsb
cmp al, '0'
jb .quit
sub eax, '0'
lea eax, [ebx*8 + eax]
lea ebx, [ebx*2 + eax]
; imul ebx, 10
; add ebx, eax
jmp @b
.quit:
ret
endp
proc pnm._.write_header
stosw
mov byte[edi], 0x0A
add edi, 1
mov word[edi], '# '
add edi, 2
mov esi, pnm._.creator_comment
mov ecx, pnm._.creator_comment.size
rep movsb
mov byte[edi], 0x0A
add edi, 1
push edi
mov al, ' '
mov ecx, (5 + 1 + 5)
rep stosb
pop edi
push edi
add edi, 4
mov eax, [ebx + Image.Width]
mov ecx, 10
.write_width:
xor edx, edx
div cx
add dl, '0'
mov byte[edi], dl
dec edi
test ax, ax
jnz .write_width
mov eax, [ebx + Image.Height]
pop edi
push edi
add edi, 10
.write_height:
xor edx, edx
div cx
add dl, '0'
mov byte[edi], dl
dec edi
test ax, ax
jnz .write_height
pop edi
add edi, 11
mov byte[edi], 0x0A
add edi, 1
ret
endp
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below is private data you should never use directly from your code ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
sz pnm._.creator_comment ,'CREATOR: KolibriOS / libimg'