;;================================================================================================;;
;;//// pcx.asm //// (c) dunkaist, 2010,2012-2013 /////////////////////////////////////////////////;;
;;================================================================================================;;
;; ;;
;; 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/>. ;;
;; ;;
;;================================================================================================;;
include 'pcx.inc'
;;================================================================================================;;
proc img.is.pcx _data, _length ;//////////////////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Determine if raw data could be decoded (is in pcx format) ;;
;;------------------------------------------------------------------------------------------------;;
;> _data = raw data as read from file/stream ;;
;> _length = data length ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = false / true ;;
;;================================================================================================;;
push edi
xor eax, eax
mov edi, [_data]
mov ecx, [edi]
shl ecx, 8
cmp ecx, 0x01050a00
jne .is_not_pcx
cmp byte[edi + pcx_header.reserved], 0
jne .is_not_pcx
add edi, pcx_header.filler
mov ecx, 58/2
repe scasw
jne .is_not_pcx
.is_pcx:
inc eax
.is_not_pcx:
pop edi
ret
endp
;;================================================================================================;;
proc img.decode.pcx _data, _length, _options ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Decode data into image if it contains correctly formed raw data in pcx format ;;
;;------------------------------------------------------------------------------------------------;;
;> _data = raw data as read from file/stream ;;
;> _length = data length ;;
;;------------------------------------------------------------------------------------------------;;
;< eax = 0 (error) or pointer to image ;;
;;================================================================================================;;
locals
num_planes rd 1
width rd 1
height rd 1
bp_plane rd 1
bp_scanline rd 1
line_begin rd 1
cur_scanline rd 1
retvalue rd 1 ; 0 (error) or pointer to image
endl
pusha
mov esi, [_data]
movzx eax, byte[esi + pcx_header.nplanes]
mov [num_planes], eax
movzx ebx, word[esi + pcx_header.bpl]
mov [bp_plane], ebx
imul eax, ebx
mov [bp_scanline], eax
movzx eax, word[esi + pcx_header.xmax]
sub ax, word[esi + pcx_header.xmin]
inc eax
mov [width], eax
movzx ebx, word[esi + pcx_header.ymax]
sub bx, word[esi + pcx_header.ymin]
inc ebx
mov [height], ebx
cmp [esi + pcx_header.bpp], 1
jz .monochrome
cmp byte[esi + pcx_header.nplanes], 3
jnz .indexed
.24bit:
stdcall img.create, [bp_plane], 1, Image.bpp24
mov [cur_scanline], eax
test eax, eax
jz .quit
stdcall img.create, [width], [height], Image.bpp24
mov [retvalue], eax
test eax, eax
jz .quit
mov esi, [_data]
add esi, sizeof.pcx_header
mov edx, [eax + Image.Data]
.24bit.scanline:
mov edi, [cur_scanline]
mov ebx, [bp_scanline]
@@:
call pcx._.get_byte
rep stosb
test ebx, ebx
jnz @b
stdcall pcx._.scanline_unpack, [width], [bp_plane], [cur_scanline], [num_planes]
dec [height]
jnz .24bit.scanline
jmp .quit
.indexed:
stdcall img.create, [width], [height], Image.bpp8i
mov [retvalue], eax
test eax, eax
jz .quit
mov ebx, eax
mov esi, [_data]
add esi, [_length]
sub esi, 256*3 ; rgb triplets
mov edi, [eax + Image.Palette]
mov ecx, 256
mov eax, 0x0000ff00
@@:
mov al, [esi + 0]
mov [edi + 2], ax
mov al, [esi + 1]
mov [edi + 1], al
mov al, [esi + 2]
mov [edi + 0], al
add esi, 3
add edi, 4
dec ecx
jnz @b
mov esi, [_data]
add esi, sizeof.pcx_header
mov edi, [ebx + Image.Data]
.indexed.scanline:
mov ebx, [bp_scanline]
@@:
call pcx._.get_byte
rep stosb
test ebx, ebx
jnz @b
dec [height]
jnz .indexed.scanline
jmp .quit
.monochrome:
stdcall img.create, [width], [height], Image.bpp1
mov [retvalue], eax
test eax, eax
jz .quit
mov edi, [eax + Image.Palette]
mov [edi], dword 0xff000000
mov [edi + 4], dword 0xffffffff
mov esi, [_data]
add esi, sizeof.pcx_header
mov edi, [eax + Image.Data]
.monochrome.scanline:
mov ebx, [bp_scanline]
@@:
call pcx._.get_byte
rep stosb
test ebx, ebx
jnz @b
dec [height]
jnz .monochrome.scanline
; jmp .quit
.quit:
popa
mov eax, [retvalue]
ret
endp
;;================================================================================================;;
proc img.encode.pcx _img, _common, _specific ;////////////////////////////////////////////////////;;
;;------------------------------------------------------------------------------------------------;;
;? Encode image into raw data in pcx 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 pcx._.get_byte
mov ecx, 1
xor eax, eax
lodsb
cmp eax, 0xc0
jb @f
and eax, 0x3f
mov ecx, eax
lodsb
@@:
sub ebx, ecx
ret
endp
proc pcx._.scanline_unpack _width, _bp_plane, _scanline, _num_planes
push esi
mov esi, [_scanline]
mov ebx, [_num_planes]
dec ebx
.plane:
mov ecx, [_width]
mov edi, edx
add edi, ebx
@@:
mov al, [esi]
mov [edi], al
add esi, 1
add edi, [_num_planes]
dec ecx
jnz @b
add esi, [_bp_plane]
sub esi, [_width]
dec ebx
jns .plane
mov edx, edi
pop esi
ret
endp
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;
;! Below is private data you should never use directly from your code ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;