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;;================================================================================================;;

;;//// pcx.asm //// (c) dunkaist, 2010,2012 //////////////////////////////////////////////////////;;

;;================================================================================================;;

;;                                                                                                ;;

;; 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 .                                                    ;;

;;                                                                                                ;;

;;================================================================================================;;

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	ecx edi

	xor	eax, eax

	mov	edi, [_data]

	cmp	byte[edi + pcx_header.magic_number], 0x0A

	jne	.is_not_pcx

	cmp	byte[edi + pcx_header.version], 5

	jne	.is_not_pcx

	cmp	byte[edi + pcx_header.encoding], 1

	jne	.is_not_pcx

	cmp	byte[edi + pcx_header.reserved], 0

	jne	.is_not_pcx

	add	edi, pcx_header.filler

	xor	al, al

	mov	ecx, 58

	cld

	repe	scasb

	test	ecx, ecx

	jnz	.is_not_pcx

  .is_pcx:

	inc	eax

  .is_not_pcx:

	pop	edi ecx

	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

	nplanes			rd	1

	xsize			rd	1

	ysize			rd	1

	bpl			rd	1

	total_bpl		rd	1

	line_begin		rd	1

	retvalue		rd	1		; 0 (error) or pointer to image

endl

	pusha

	mov	esi, [_data]

	movzx	eax, byte[esi + pcx_header.nplanes]

	mov	[nplanes], eax

	movzx	ebx, word[esi + pcx_header.bpl]

	mov	[bpl], ebx

	imul	eax, ebx

	mov	[total_bpl], eax

	movzx	eax, word[esi + pcx_header.xmax]

	sub	ax, word[esi + pcx_header.xmin]

	inc	eax

	mov	[xsize], eax

	movzx	ebx, word[esi + pcx_header.ymax]

	sub	bx, word[esi + pcx_header.ymin]

	inc	ebx

	mov	[ysize], ebx

	cmp	[esi + pcx_header.bpp], 1

	jz	.monochrome

	cmp	byte[esi + pcx_header.nplanes], 3

	jnz	.indexed

  .24bit:

	stdcall	img.create, eax, ebx, Image.bpp24

	mov	[retvalue], eax

	test	eax, eax

	jz	.quit

	mov	esi, [_data]

	add	esi, 128			; skip header

	mov	edi, [eax + Image.Data]

	add	edi, 2

	mov	[line_begin], edi

  .24bit.scanline:

	mov	ebx, [total_bpl]

  .24bit.color_line:

	mov	edx, [bpl]

  .24bit.next_byte:

	call	pcx._.get_byte

	sub	edx, ecx

    @@:

	mov	[edi], al

	add	edi, [nplanes]

	dec	ecx

	jnz	@b

	test	edx, edx

	jnz	.24bit.next_byte

  .24bit.end_color_line:

	test	ebx, ebx

	jz	.24bit.end_full_line

	dec	[line_begin]

	mov	edi, [line_begin]

	jmp	.24bit.color_line

  .24bit.end_full_line:

	dec	[ysize]

	jz	.quit

	add	edi, 2

	bt	[xsize], 0

	jnc	@f

	sub	edi, 3

    @@:

	mov	[line_begin], edi

	jmp	.24bit.scanline

  .indexed:

	stdcall	img.create, eax, ebx, Image.bpp8i

	mov	[retvalue], eax

	test	eax, eax

	jz	.quit

	mov	ebx, eax

	mov	esi, [_data]

	add	esi, [_length]

	sub	esi, 768

	mov	edi, [eax + Image.Palette]

	mov	ecx, 256

	xor	eax, eax

    @@:

	lodsw

	xchg	al, ah

	shl	eax, 8

	lodsb

	stosd

	dec	ecx

	jnz	@b

	mov	esi, [_data]

	add	esi, 128

	mov	edi, [ebx + Image.Data]

  .indexed.line:

	mov	ebx, [total_bpl]

  .indexed.next_byte:

	call	pcx._.get_byte

    @@:

	stosb

	dec	ecx

	jnz	@b

	test	ebx, ebx

	jnz	.indexed.next_byte

	dec	[ysize]

	jnz	.indexed.line

	jmp	.quit

  .monochrome:

	stdcall	img.create, eax, ebx, 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, 128

	mov	edi, [eax + Image.Data]

  .monochrome.line:

	mov	ebx, [total_bpl]

  .monochrome.next_byte:

	call	pcx._.get_byte

    @@:

	stosb

	dec	ecx

	jnz	@b

	test	ebx, ebx

	jnz	.monochrome.next_byte

	dec	[ysize]

	jnz	.monochrome.line

;	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

	xor	ecx, ecx

	lodsb

	cmp	al, 0xC0

	setb	cl

	jb	.done

	and	al, 0x3F

	mov	cl, al

	lodsb

  .done:

	sub	ebx, ecx

	ret

endp

;;================================================================================================;;

;;////////////////////////////////////////////////////////////////////////////////////////////////;;

;;================================================================================================;;

;! Below is private data you should never use directly from your code                             ;;

;;================================================================================================;;

;;////////////////////////////////////////////////////////////////////////////////////////////////;;

;;================================================================================================;;