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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2018-xxxx
SPDX-License-Identifier:	BSD-3-Clause

%%	header

/**	@file	dk4grcoa.h	Graphics configuration with application support.
*/


#ifndef	DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif

#ifndef	DK4APP_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4app.h"
#else
#include <dktools-4/dk4app.h>
#endif
#endif

#ifndef	DK4GRCO_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4grco.h"
#else
#include <dktools-4/dk4grco.h>
#endif
#endif


#ifdef	__cplusplus
extern "C" {
#endif


/**	Set up graphics configuration from text string and/or configuration file(s).
	@param	conf	Configuration structure to set up.
	@param	txt		Text containing information, may be NULL.
	@param	usecfg	Flag: Process configuration file.
	@param	cfscope	Configuration scopes allowed in txt.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (program can continue), 0 on error (abort program).
*/

int
dk4gra_conf_setup(
	dk4_gra_conf_t			*conf,
	dkChar			const	*txt,
	int						 usecfg,
	int						 cfscope,
	dk4_app_t				*app
);


#ifdef	__cplusplus
}
#endif

/* vim: set ai sw=4 ts=4 : */
%%	module

#ifndef	DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef	DK4MPL_H_INCLUDED
#include "dk4mpl.h"
#endif

#ifndef	DK4FS_H_INCLUDED
#include "dk4fs.h"
#endif

#ifndef	DK4STRD_H_INCLUDED
#include "dk4strd.h"
#endif

#ifndef	DK4STRDA_H_INCLUDED
#include "dk4strda.h"
#endif

#ifndef	DK4TSPDK_H_INCLUDED
#include "dk4tspdk.h"
#endif

#ifndef	DK4STRMR_H_INCLUDED
#include "dk4strmr.h"
#endif

#ifndef	DK4PAPER_H_INCLUDED
#include "dk4paper.h"
#endif

#ifndef	DK4GRALO_H_INCLUDED
#include "dk4gralo.h"
#endif

#ifndef	DK4GRCOA_H_INCLUDED
#include "dk4grcoa.h"
#endif

#ifndef	DK4PAPEA_H_INCLUDED
#include "dk4papea.h"
#endif

#ifndef	DK4MAIDDII_H_INCLUDED
#include "dk4maiddii.h"
#endif

#ifndef	DK4MAIDDUI_H_INCLUDED
#include "dk4maiddui.h"
#endif

#ifndef	DK4MAIDDBL_H_INCLUDED
#include "dk4maiddbl.h"
#endif

#ifndef	DK4UNUSED_H_INCLUDED
#include "dk4unused.h"
#endif

#if DK4_HAVE_ASSERT_H
#ifndef	ASSERT_H_INCLUDED
#include <assert.h>
#define	ASSERT_H_INCLUDED 1
#endif
#endif


$!trace-include



/**	Driver names.
*/
static dkChar const * const	dk4gra_conf_driver_names[] = {
$!string-table	macro=dkT
pdf
eps
ps
tex
bb
$!end
};



/**	Purpose names.
*/
static dkChar const * const dk4gra_conf_purpose_names[] = {
$!string-table	macro=dkT
o$bject
i$mage
d$ocument
$!end
};



/**	Names of configuration keys.
	Order of entries must match in dk4gra_conf_key_names,
	dk4gra_conf_cfgfile_key_names and dk4gra_conf_key_scopes.
*/
static dkChar const * const dk4gra_conf_key_names[] = {
$!string-table	macro=dkT
#
#	0	Allow color output
#
c$olor
#
#	1	How to use alpha channel
#
al$pha
#
#	2	Background RGB triple
#
b$g
#
#	3	Force image background
#
f$orce-bg
#
#	4	Allow image interpolation
#
in$terpolation
#
#	5	Use DCT-encoded data from JPEG files directly
#
dc$t
#
#	6	Allow image interpolation for DCT-encoded data from JPEG files
#
dct-$interpolation
#
#	7	Analyze bits per component, reduce if possible
#
a-b$pc
#
#	8	Analyze use of color, switch to grayscale if possible
#
a-c$olor
#
#	9	Analyze alpha channel, ignore if possible
#
a-a$lpha
#
#	10	Ignore resolution chunk from bitmap image files
#
i-$res
#
#	11	PS language level
#
le$vel
#
#	12	Allow LZW compression in PS 2 output
#
lz$w
#
#	13	Paper size
#
p$aper
#
#	14	Duplex printing
#
du$plex
#
#	15	Duplex and tumble
#
t$umble
#
#	16	Document structuring comments
#
ds$c
#
#	17	RGB to gray conversion method
#
rgb-to-gray
#
#	18	RGB to CMYK conversion method
#
rgb-to-cmyk
#
#	19	Ignore aspect ratio
#
i-a$spect
#
#	20	Allow to rotate image
#
ro$tate
#
#	21	Specified image resolution
#
resolution
#
#	22	X-spline sub segments
#
xss$s
#
#	23	X-spline length precision
#
xsl$p
#
#	24	X-spline parameter precision
#
xsp$p
$!end
};



/**	Key names in configuration files.
	Order of entries must match in dk4gra_conf_key_names,
	dk4gra_conf_cfgfile_key_names and dk4gra_conf_key_scopes.
*/
static dkChar const * const dk4gra_conf_cfgfile_key_names[] = {
$!string-table	macro=dkT
#
#	0	Allow color output
#
color
#
#	1	How to use alpha channel
#
use alpha channel
#
#	2	Background RGB triple
#
image background
#
#	3	Force image background
#
force image background
#
#	4	Allow image interpolation
#
image interpolation
#
#	5	Use DCT-encoded data from JPEG files directly
#
use dct encoded data
#
#	6	Allow image interpolation for DCT-encoded data from JPEG files
#
dct image interpolation
#
#	7	Analyze bits per component, reduce if possible
#
analyze bits per component
#
#	8	Analyze use of color, switch to grayscale if possible
#
analyze colors
#
#	9	Analyze alpha channel, ignore if possible
#
analyze alpha
#
#	10	Ignore resolution chunk from bitmap image files
#
ignore resolution
#
#	11	PS language level
#
level
#
#	12	Allow LZW compression in PS 2 output
#
lzw
#
#	13	Paper size
#
paper size
#
#	14	Duplex printing
#
duplex
#
#	15	Duplex and tumble
#
tumble
#
#	16	Document structuring comments
#
dsc
#
#	17	RGB to gray conversion method
#
rgb to gray
#
#	18	RGB to CMYK conversion method
#
rgb to cmyk
#
#	19	Ignore aspect ratio
#
ignore aspect ratio
#
#	20	Allow to rotate image
#
allow rotate
#
#	21	Image resolution when processing just one image
#
resolution
#
#	22	Number of Bezier segements to draw per X-spline segment
#
x-spline sub segments
#
#	23	X-spline length precision
#
x-spline length precision
#
#	24	X-spline parameter precision
#
x-spline parameter precision
$!end
};



/**	Constant text fragments.
*/
static const dkChar * const	dk4gra_conf_txt[] = {
$!string-table	macro=dkT
#
#	0	Separator string
#
: \t\r\n\v\f
#
#	1	Configuration file name
#
dk4gra.conf
#
#	2	Match any driver or purpose
#
*
$!end
};



/**	Names for alpha channel handling methods.
*/
static const dkChar * const	dk4gra_conf_alpha_processing[] = {
$!string-table	macro=dkT
m$ix
f$oreground
$!end
};



/**	Names of RGB to gray conversion methods.
*/
static const dkChar * const dk4gra_conf_rgb_to_gray_methods[] = {
$!string-table	macro=dkT
bt6$01
l$uminance
f$ast
faste$st
bt7$09
a$verage
d$esaturation
mi$n
me$dian
ma$x
r$ed
g$reen
bl$ue
$!end
};



/**	Method names for RGB to CMYK conversion.
*/
static const dkChar * const dk4gra_conf_rgb_to_cmyk_methods[] = {
$!string-table	macro=dkT
n$on-standard
s$tandard
$!end
};



/**	Names for methods how to handle resolution.
*/
static const dkChar * const	dk4gra_reso_names[] = {
$!string-table	macro=dkT
1$px1pt
c$hunk
$!end
};



/**	Scopes of configuration keys.
	Order of entries must match in dk4gra_conf_key_names,
	dk4gra_conf_cfgfile_key_names and dk4gra_conf_key_scopes.
*/
static const int dk4gra_conf_key_scopes[] = {
	/*	 0	Allow color output	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	 1	How to use alpha channel	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 2	Background RGB triple	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 3	Force image background	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 4	Allow image interpolation	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 5	Use DCT-encoded data from JPEG files directly	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 6	Allow image interpolation for DCT-encoded data from JPEG files	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 7	Analyze bits per component, reduce if possible	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 8	Analyze use of color, switch to grayscale if possible	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	 9	Analyze alpha channel, ignore if possible	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	10	Ignore resolution chunk from bitmap image files	*/
	DK4_GRA_CONF_SCOPE_IMAGE ,

	/*	11	PS language level	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	12	Allow LZW compression in PS 2 output	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	13	Paper size	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	14	Duplex printing	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	15	Duplex and tumble	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	16	Document structuring comments	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	17	RGB to gray conversion method	*/
	DK4_GRA_CONF_SCOPE_SETUP ,

	/*	18	RGB to CMYK conversion method	*/
	DK4_GRA_CONF_SCOPE_SETUP,

	/*	19	Ignore aspect ratio of image	*/
	DK4_GRA_CONF_SCOPE_IMAGE,

	/*	20	Allow image rotation to better fit into space	*/
	DK4_GRA_CONF_SCOPE_IMAGE,

	/*	21	Image resolution when bmpp processes one image per page */
	DK4_GRA_CONF_SCOPE_IMAGE,

	/*	22	Bezier segments per X-spline segment */
	DK4_GRA_CONF_SCOPE_DRAW,

	/*  23	X-spline length precision */
	DK4_GRA_CONF_SCOPE_DRAW,

	/*	24	X-spline parameter precision */
	DK4_GRA_CONF_SCOPE_DRAW,
};



/**	Retrieve boolean value from value text.
	@param	bptr	Address of boolean variable.
	@param	keyname	Key name to use in diagnostics.
	@param	value	Value text, may be NULL.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_bool(
	int					*bptr,
#if	TRACE_DEBUG
	dkChar		const	*keyname,
#else
	dkChar		const	*	DK4_ARG_UNUSED(keyname),
#endif
	dkChar		const	*value,
	dk4_app_t			*app
)
{
	int			  back = 1;
#if	(!(TRACE_DEBUG))
	DK4_UNUSED_ARG(keyname)
#endif
	$? "+ dk4gra_conf_bool \"%!ds\"=\"%!ds\"", TR_STR(keyname), TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != bptr);
	assert(NULL != value);
#endif
	if (NULL != value) {
		if (0 != dk4str_is_bool(value)) {
			*bptr = dk4str_is_on(value);
		}
		else {
			/* ERROR: Not a boolean */
			dk4gralog_3(app, DK4_LL_ERROR, 0, 1, value);
			back = 0;
		}
	}
	else {
		*bptr = 1;
	}
	$? "- dk4gra_conf_bool %d", back
	return back;
}



/**	Retrieve method for RGB to gray conversion.
	@param	conf		Structure to configure.
	@param	keyname		Key name to use in diagnostics.
	@param	value		Value text, may be NULL.
	@param	app			Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_rgb_to_gray(
	dk4_gra_conf_t				*conf,
	dkChar		const			*keyname,
	dkChar		const			*value,
	dk4_app_t					*app
)
{
	int			 back	= 0;
	int			 res;
	$? "+ dk4gra_conf_rgb_to_gray \"%!ds\"", TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != value);
#endif
	if (NULL != value) {
		res = dk4str_abbr_index(
			dk4gra_conf_rgb_to_gray_methods, dkT('$'), value, 0
		);
		if (-1 < res) {
			back = 1;
		}
		switch (res) {
			case 0: {	/* bt601 */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_ITU_BT601, NULL
				);
			} break;
			case 1: {	/* luminance */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_LUMA, NULL
				);
			} break;
			case 2: {	/* fast */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_FAST, NULL
				);
			} break;
			case 3: {	/* fastest */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_VERY_FAST, NULL
				);
			} break;
			case 4: {	/* bt709 */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_ITU_BT709, NULL
				);
			} break;
			case 5: {	/* average */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_AVERAGE, NULL
				);
			} break;
			case 6: {	/* desaturation */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_DESATURATION, NULL
				);
			} break;
			case 7: {	/* min */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx),
					DK4_CS_CONV_RGB_TO_GRAY_MIN_DECOMPOSITION, NULL
				);
			} break;
			case 8: {	/* medium */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx),
					DK4_CS_CONV_RGB_TO_GRAY_MEDIUM_DECOMPOSITION, NULL
				);
			} break;
			case 9: {	/* max */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx),
					DK4_CS_CONV_RGB_TO_GRAY_MAX_DECOMPOSITION, NULL
				);
			} break;
			case 10: {	/* red */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_CHANNEL_RED, NULL
				);
			} break;
			case 11: {	/* green */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_CHANNEL_GREEN, NULL
				);
			} break;
			case 12: {	/* blue */
				back = 1;
				(void)dk4cs_context_set_rgb_to_gray(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_GRAY_CHANNEL_BLUE, NULL
				);
			} break;
			default : {
				/* ERROR: Unknown method name */
				dk4gralog_3(app, DK4_LL_ERROR, 34, 35, value);
			} break;
		}
	}
	else {
		/* ERROR: Missing value */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_rgb_to_gray %d", back
	return back;
}



/**	Retrieve method for RGB to CMYK conversion.
	@param	conf		Structure to configure.
	@param	keyname		Key name to use in diagnostics.
	@param	value		Value text, may be NULL.
	@param	app			Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_rgb_to_cmyk(
	dk4_gra_conf_t				*conf,
	dkChar		const			*keyname,
	dkChar		const			*value,
	dk4_app_t					*app
)
{
	int			 back	= 0;
	int			 res;
	$? "+ dk4gra_conf_rgb_to_cmyk \"%!ds\"", TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != value);
#endif
	if (NULL != value) {
		res = dk4str_abbr_index(
			dk4gra_conf_rgb_to_cmyk_methods, dkT('$'), value, 0
		);
		switch (res) {
			case 0: {	/* non-standard */
				back = 1;
				(void)dk4cs_context_set_rgb_to_cmyk(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_CMYK_NOT_PS_PDF, NULL
				);
			} break;
			case 1: {	/* standard */
				back = 1;
				(void)dk4cs_context_set_rgb_to_cmyk(
					&(conf->ctx), DK4_CS_CONV_RGB_TO_CMYK_PS_PDF, NULL
				);
			} break;
			default: {
				/* ERROR: Unknown method */
				dk4gralog_3(app, DK4_LL_ERROR, 36, 37, value);
			} break;
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_rgb_to_cmyk %d", back
	return back;
}



/**	Retrieve alpha handling value from value text.
	@param	conf	Structure to configure.
	@param	keyname	Key name to use in diagnostics.
	@param	value	Value text, may be NULL.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_alpha_handling(
	dk4_gra_conf_t		*conf,
	dkChar		const	*keyname,
	dkChar		const	*value,
	dk4_app_t			*app
)
{
	int			 back	= 0;
	int			 res;
	$? "+ dk4gra_conf_alpha_handling \"%!ds\"", TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != value);
#endif
	if (NULL != value) {
		res = dk4str_abbr_index(dk4gra_conf_alpha_processing,dkT('$'),value,0);
		switch (res) {
			case 0: {
				back = 1;
				dk4cs_context_set_alpha(
					&(conf->ctx), DK4_CS_CONV_ALPHA_MIX, NULL
				);
			} break;
			case 1: {
				back = 1;
				dk4cs_context_set_alpha(
					&(conf->ctx), DK4_CS_CONV_ALPHA_FOREGROUND, NULL
				);
			} break;
			default : {
				/* ERROR: Illegal value */
				dk4gralog_3(app, DK4_LL_ERROR, 38, 39, value);
			} break;
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_alpha_handling %d", back
	return back;
}



/**	Check whether a value is within specified range, correct if necessary.
	@param	value	Address of value variable.
	@param	min		Minimum value.
	@param	max		Maximum value.
	@param	app		Application structure for diagnostics.
	@return	1 on success, 0 on error.
*/
static
int
dk4gra_conf_check_range(
	int					*value,
	int					 min,
	int					 max,
	dkChar		const	*txt,
	dk4_app_t			*app
)
{
	int		 back	= 1;
#if	DK4_USE_ASSERT
	assert(NULL != value);
#endif
	if (min > *value) {
		*value = min;
		back = 0;
		/* ERROR: Value too small! */
		dk4gralog_3(app, DK4_LL_ERROR, 4, 5, txt);
	}
	if (max < *value) {
		*value = max;
		back = 0;
		/* ERROR: Value too large! */
		dk4gralog_3(app, DK4_LL_ERROR, 4, 5, txt);
	}
	return back;
}



/**	Retrieve background color from value text.
	@param	bptr	Address of boolean variable.
	@param	keyname	Key name to use in diagnostics.
	@param	value	Value text, may be NULL.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_background(
	int					*r,
	int					*g,
	int					*b,
	int					*f,
	dkChar		const	*keyname,
	dkChar				*value,
	dk4_app_t			*app
)
{
	dkChar const	*ep;
	dkChar			*p[8];
	size_t			 numtok	=	0;
	int				 back	=	0;
	$? "+ dk4gra_conf_background \"%!ds\"", TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != r);
	assert(NULL != g);
	assert(NULL != b);
	assert(NULL != f);
	assert(NULL != value);
#endif
	if (NULL != value) {
		numtok = dk4str_tokenize(p, 8, value, dk4gra_conf_txt[0], NULL);
		switch (numtok) {
			case 3: case 4: {
				back = 1;
				ep = NULL;
				if (0 == dk4ma_input_dk_dec_int(r, p[0], &ep, 1, NULL)) {
					back = 0;
					/* ERROR: Incorrect value */
					dk4gralog_3(app, DK4_LL_ERROR, 6, 7, p[0]);
				}
				else {
					if (0 == dk4gra_conf_check_range(r, 0, 255, p[0], app)) {
						back = 0;
					}
				}
				ep = NULL;
				if (0 == dk4ma_input_dk_dec_int(g, p[1], &ep, 1, NULL)) {
					back = 0;
					/* ERROR: Incorrect value */
					dk4gralog_3(app, DK4_LL_ERROR, 6, 7, p[1]);
				}
				else {
					if (0 == dk4gra_conf_check_range(g, 0, 255, p[1], app)) {
						back = 0;
					}
				}
				ep = NULL;
				if (0 == dk4ma_input_dk_dec_int(b, p[2], &ep, 1, NULL)) {
					back = 0;
					/* ERROR: Incorrect value */
					dk4gralog_3(app, DK4_LL_ERROR, 6, 7, p[2]);
				}
				else {
					if (0 == dk4gra_conf_check_range(b, 0, 255, p[2], app)) {
						back = 0;
					}
				}
				if (4 == numtok) {
					if (dk4str_is_bool(p[3])) {
						*f = dk4str_is_on(p[3]);
					}
					else {
						/* ERROR: Incorrect value */
						dk4gralog_3(app, DK4_LL_ERROR, 4, 5, p[3]);
					}
				}
			} break;
			default : {
				/* ERROR: Incorrect value */
				dk4gralog_1(app, DK4_LL_ERROR, 14);
			} break;
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_background %d", back
	return back;
}



/**	Retrieve PS language level value from value text.
	@param	bptr	Address of boolean variable.
	@param	keyname	Key name to use in diagnostics.
	@param	value	Value text, may be NULL.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_psll(
	int					*bptr,
	dkChar		const	*keyname,
	dkChar		const	*value,
	dk4_app_t			*app
)
{
	const dkChar	*ep		=	NULL;
	int				 back	= 0;
	int				 psl	= 0;
	int				 res	= 0;
	$? "+ dk4gra_conf_psll \"%!ds\"", TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != bptr);
	assert(NULL != value);
#endif
	if (NULL != value) {
		res = dk4ma_input_dk_dec_int(&psl, value, &ep, 1, NULL);
		if (0 != res) {
			if ((1 < psl) && (4 > psl)) {
				*bptr = psl;	$? ". psl = %d", psl
				back = 1;
			}
			else {
				/* ERROR: Invalid value */
				dk4gralog_3(app, DK4_LL_ERROR, 24, 25, value);
			}
		}
		else {
			/* ERROR: Not a number */
			dk4gralog_3(app, DK4_LL_ERROR, 6, 7, value);
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_psll %d", back
	return back;
}



/**	Retrieve paper size from value text.
	@param	bptr	Address of boolean variable.
	@param	keyname	Key name to use in diagnostics.
	@param	value	Value text, may be NULL.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_paper_size(
	dk4_gra_conf_t				*conf,
#if	0
	dk4_paper_size_t			*paper,
#endif
	dkChar				const	*keyname,
	dkChar				const	*value,
	dk4_app_t					*app
)
{
#if	VERSION_BEFORE_2018_03_27
	dk4_paper_size_t	*paps;
	int					 back	= 0;
	$? "+ dk4gra_conf_paper_size \"%!ds\"", TR_STR(value)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != value);
#endif
	if (NULL != value) {
		paps = dk4app_get_paper_size(app, value);
		if (NULL != paps) {
			DK4_MEMCPY(&(conf->media), paps, sizeof(dk4_paper_size_t));
			back = 1;
			dk4mem_free(paps);
		}
		else {
			/* ERROR: Not found */
			dk4gralog_3(app, DK4_LL_ERROR, 16, 17, value);
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_paper_size %d", back
	return back;
#else
	dk4_paper_size_collection_t		*pcoll	=	NULL;
	dk4_paper_size_t				*paps	=	NULL;
	dk4_paper_size_t const			*cpaps	=	NULL;
	int								 back	=	0;
	$? "+ dk4gra_conf_paper_size \"%!ds\"", TR_STR(value)
	conf->psi = 0;
	conf->have_psi = 0;
	if (NULL != value) {
		/*
			First attempt: Use collection
		*/
		pcoll = dk4app_get_paper_sizes(app);
		if (NULL != pcoll) {	$? ". have collection, search for size and ind"
			cpaps = dk4papersize_coll_find_with_index(
				pcoll, value, &(conf->psi), NULL
			);
			if (NULL != cpaps) {
				DK4_MEMCPY(&(conf->media), cpaps, sizeof(dk4_paper_size_t));
				conf->media.name = NULL;
				back = 1;
				conf->have_psi = 1;
			}
			dk4papersize_coll_close(pcoll);
		}
		/*
			Second attempt: Ask for paper size directly
		*/
		if (0 == back) {
			paps = dk4app_get_paper_size(app, value);
			if (NULL != paps) {
				DK4_MEMCPY(&(conf->media), paps, sizeof(dk4_paper_size_t));
				back = 1;
				dk4mem_free(paps);
			}
			else {
				/* ERROR: Not found */
				dk4gralog_3(app, DK4_LL_ERROR, 16, 17, value);
			}
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	$? "- dk4gra_conf_paper_size %d", back
	return back;
#endif
}



static
int
dk4gra_conf_resolution(
	dk4_gra_conf_t		*conf,
	const dkChar		*keyname,
	dkChar				*value,
	dk4_app_t			*app
)
{
	dkChar			*p[8];
	const dkChar	*ep		=	NULL;
	double			 rv;
	double			 rw;
	size_t			 numtok	=	0;
	int				 back	=	0;
	int				 res;
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != value);
#endif
	if (NULL != value) {
		numtok = dk4str_tokenize(p, 8, value, dk4gra_conf_txt[0], NULL);
		switch (numtok) {
			case 1: {
				switch (dk4str_abbr_index(dk4gra_reso_names,dkT('$'),p[0],0)) {
					case 0: {
						conf->xres = 72.0;
						conf->yres = 72.0;
						back = 1;
					} break;
					case 1: {
						/* Left empty by intent, do not specify a resolution */
						back = 1;
					} break;
					default : {
						rv = 0.0;
						res = dk4ma_input_dk_double(&rv, p[0], &ep, 1, NULL);
						if (0 != res) {
							if (0.0 < rv) {
								conf->xres = conf->yres = rv;
								back = 1;
							}
							else {
								dk4gralog_3(app, DK4_LL_ERROR, 2, 3, p[0]);
							}
						}
						else {
							/* ERROR: Invalid resolution value */
							dk4gralog_3(app, DK4_LL_ERROR, 2, 3, p[0]);
						}
					} break;
				}
			} break;
			case 2: {
				rv = rw = 0.0;
				ep = NULL;
				res = dk4ma_input_dk_double(&rv, p[0], &ep, 1, NULL);
				if (0 != res) {
					ep = NULL;
					res = dk4ma_input_dk_double(&rw, p[1], &ep, 1, NULL);
					if (0 != res) {
						if (0.0 < rv) {
							if (0.0 < rw) {
								conf->xres = rv;
								conf->yres = rw;
								back = 1;
							}
							else {
								dk4gralog_3(app, DK4_LL_ERROR, 2, 3, p[1]);
							}
						}
						else {
							dk4gralog_3(app, DK4_LL_ERROR, 2, 3, p[0]);
						}
					}
					else {
						/* ERROR: Invalid resolution value */
						dk4gralog_3(app, DK4_LL_ERROR, 2, 3, p[1]);
					}
				}
				else {
					/* ERROR: Invalid resolution value */
					dk4gralog_3(app, DK4_LL_ERROR, 2, 3, p[0]);
				}
			} break;
			default : {
				dk4gralog_1(app, DK4_LL_ERROR, 14);
			} break;
		}
	}
	else {
		/* ERROR: Value required */
		dk4gralog_3(app, DK4_LL_ERROR, 20, 21, keyname);
	}
	return back;
}



static
int
dk4gra_conf_xsss(
	dk4_gra_conf_t		*conf,
	dkChar				*value,
	dk4_app_t			*app
)
{
	const dkChar	*ep		= NULL;
	unsigned		 u		= 0U;
	int				 res	= 0;
	int				 back	= 0;
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != value);
#endif
	if (NULL != value) {
		res = dk4ma_input_dk_dec_uint(&u, value, &ep, 1, NULL);
		if (0 != res) {
			if (0U < u) {
				conf->xsss = u;
				back = 1;
				if (16U < u) {
					dk4gralog_1(app, DK4_LL_WARNING, 64);
				}
				else {
					if (4U > u) {
						dk4gralog_1(app, DK4_LL_WARNING, 65);
					}
				}
			}
			else {
				/* ERROR: Illegal value 0 */
				conf->xsss = 8U;
				dk4gralog_1(app, DK4_LL_ERROR, 63);
			}
		}
		else {
			/* ERROR: Not an unsigned number */
			conf->xsss = 8U;
			dk4gralog_3(app, DK4_LL_ERROR, 61, 62, value);
		}
	}
	else {
		conf->xsss = 8U;
		back = 1;
	}
	return back;
}



static
int
dk4gra_conf_posdouble(
	double				*rp,
	const dkChar		*keyname,
	dkChar				*value,
	dk4_app_t			*app
)
{
	double		 	 d;
	const dkChar	*ep	=	NULL;
	int			 	 back	= 1;
#if	DK4_USE_ASSERT
	assert(NULL != rp);
	assert(NULL != value);
#endif
	if (NULL != value) {
		back = dk4ma_input_dk_double(&d, value, &ep, 1, NULL);
		if (0 != back) {
			if (0.0 < d) {
				*rp = d;
			}
			else {
				back = 0;
				/* ERROR: Positive number required */
				dk4gralog_3(app, DK4_LL_ERROR, 70, 71, keyname);
			}
		}
		else {
			/* ERROR: Not a double number */
			dk4gralog_3(app, DK4_LL_ERROR, 68, 69, value);
		}
	}
	else {
		/* WARNING: Value required */
		dk4gralog_3(app, DK4_LL_WARNING, 66, 67, keyname);
	}
	return back;
}



/**	Reader object.
*/
typedef struct {
	dk4_gra_conf_t			*conf;	/**< Configuration structure to modify. */
	dk4_app_t				*app;	/**< Application structure. */
	dk4_um_t				 lno;	/**< Line number. */
	int						 insc;	/**< Flag: In scope */
} reader_obj_t;



/**	Check scope line whether or not it matches driver, purpose
	or combination of both.
	@param	conf	Configuration structure to set up.
	@param	txt		Text line to process.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on match, 0 on no match.
*/
static
int
dk4gra_conf_scope_check(
	dk4_gra_conf_t	*conf,
	dkChar			*txt,
	dk4_app_t		*app
)
{
	dkChar		*eptr;
	dkChar		*pptr;
	int			 drno;
	int			 puno;
	int			 drmatch;
	int			 pumatch;
	int			 back	= 0;
	$? "+ dk4gra_conf_scope_check \"%!ds\"", TR_STR(txt)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != txt);
#endif
	txt++;	txt = dk4str_start(txt, NULL);
	if (NULL != txt) {
		eptr = dk4str_chr(txt, dkT(']'));
		if (NULL != eptr) {
			*eptr = dkT('\0');
		}
		pptr = dk4str_chr(txt, dkT('.'));
		if (NULL != pptr) {
			*(pptr++) = dkT('\0'); pptr = dk4str_start(pptr, NULL);
		}
		if (NULL != pptr) {				$? ". driver and purpose"
			/*
				Driver.purpose combination
			*/
			drno = dk4str_array_index(dk4gra_conf_driver_names, txt, 0);
			puno = dk4str_abbr_index(
				dk4gra_conf_purpose_names, dkT('$'), pptr, 0
			);
			if (-1 < drno) {			$? ". valid driver"
				if (-1 < puno) {		$? ". valid purpose"
					drmatch = pumatch = 0;
					switch (drno) {
						case 0: {	/* pdf */
							if (DK4_GRA_DRIVER_PDF == conf->driver) {
								drmatch = 1;	$? ". driver match"
							}
						} break;
						case 1: {	/* eps */
							if (DK4_GRA_DRIVER_EPS == conf->driver) {
								drmatch = 1;	$? ". driver match"
							}
						} break;
						case 2: {	/* ps */
							if (DK4_GRA_DRIVER_EPS == conf->driver) {
								drmatch = 1;	$? ". driver match"
							}
							else {
								if (DK4_GRA_DRIVER_PS == conf->driver) {
									drmatch = 1;	$? ". driver match"
								}
							}
						} break;
						case 3: {	/* tex */
							if (DK4_GRA_DRIVER_PGF == conf->driver) {
								drmatch = 1;	$? ". driver match"
							}
						} break;
						case 4: {	/* bb */
							if (DK4_GRA_DRIVER_BB == conf->driver) {
								drmatch = 1;	$? ". driver match"
							}
						} break;
					}
					switch (puno) {
						case 0: {
							if (DK4_GRA_PURPOSE_OBJECT == conf->purpose) {
								pumatch = 1;	$? ". purpose match"
							}
						} break;
						case 1: {
							if (DK4_GRA_PURPOSE_IMAGE == conf->purpose) {
								pumatch = 1;	$? ". purpose match"
							}
						} break;
						case 2: {
							if (DK4_GRA_PURPOSE_DOCUMENT == conf->purpose) {
								pumatch = 1;	$? ". purpose match"
							}
						} break;
					}
					if ((0 != drmatch) && (0 != pumatch)) {
						back = 1;	$? ". match ok"
					}
					else {
						$? ". drmatch=%d pumatch=%d", drmatch, pumatch
					}
				}
				else {				$? "! invalid purpose"
					/* ERROR: No such purpose */
					dk4gralog_3(app, DK4_LL_ERROR, 27, 28, pptr);
				}
			}
			else {					$? "! invalid driver"
				/* ERROR: No such driver */
				dk4gralog_3(app, DK4_LL_ERROR, 29, 30, txt);
			}
		}
		else {						$? ". driver or purpose"
			/*
				Either only driver or purpose
			*/
			switch (dk4str_array_index(dk4gra_conf_driver_names, txt, 0)) {
				case 0: {	/* pdf */
					if (DK4_GRA_DRIVER_PDF == conf->driver) {
						back = 1;		$? ". driver match"
					}
				} break;
				case 1: {	/* eps */
					if (DK4_GRA_DRIVER_EPS == conf->driver) {
						back = 1;		$? ". driver match"
					}
				} break;
				case 2: {	/* ps */
					if (DK4_GRA_DRIVER_EPS == conf->driver) {
						back = 1;		$? ". driver match"
					}
					else {
						if (DK4_GRA_DRIVER_PS == conf->driver) {
							back = 1;	$? ". driver match"
						}
					}
				} break;
				case 3: {	/* tex */
					if (DK4_GRA_DRIVER_PGF == conf->driver) {
						back = 1;		$? ". driver match"
					}
				} break;
				case 4: {	/* bb */
					if (DK4_GRA_DRIVER_BB == conf->driver) {
						back = 1;		$? ". driver match"
					}
				} break;
				default : {
					switch (
						dk4str_abbr_index(
							dk4gra_conf_purpose_names, dkT('$'), txt, 0
						)
					) {
						case 0: {
							if (DK4_GRA_PURPOSE_OBJECT == conf->purpose) {
								back = 1;	$? ". purpose match"
							}
						} break;
						case 1: {
							if (DK4_GRA_PURPOSE_IMAGE == conf->purpose) {
								back = 1;	$? ". purpose match"
							}
						} break;
						case 2: {
							if (DK4_GRA_PURPOSE_DOCUMENT == conf->purpose) {
								back = 1;	$? ". purpose match"
							}
						} break;
						default : {
							if (0 == dk4str_cmp(txt, dk4gra_conf_txt[2])) {
								back = 1;	$? ". general match"
							}
							else {
								/* ERROR: Not a driver or purpose */
								dk4gralog_3(app, DK4_LL_ERROR, 44, 45, txt);
							}
						} break;
					}
				} break;
			}
		}
	}
	$? "- dk4gra_conf_scope_check %d", back
	return back;
}



/**	Callback function, handler to process a line read by the
	text stream processor.
	@param	obj		Reader object.
	@param	line	Line to process.
	@param	lineno	Line number.
	@param	erp		Error report, may be NULL.
	@return
	DK4_TSP_RES_OK 		if the line was processed successfully,
	DK4_TSP_RES_ERROR	on error (can continue),
	DK4_TSP_RES_FATAL	on fatal error (must abort).
*/
static
int
dk4gra_conf_line_handler(
    void            *obj,
    dkChar          *line,
    dk4_um_t         lineno,
    dk4_er_t        * DK4_ARG_UNUSED(erp)
)
{
	reader_obj_t	*rdo;
	dkChar			*pcur;
	dkChar			*vptr;
	dk4_app_t		*app;
	dk4_gra_conf_t	*conf;
	int				 back;
	int				 res;
	DK4_UNUSED_ARG(erp)
	$!trace-code	if (NULL != line) { dk4str_delnl(line); }
	$? "+ dk4gra_conf_line_handler \"%!ds\"", TR_STR(line)
	back = DK4_TSP_RES_OK;
	rdo  = (reader_obj_t *)obj;
	app	 = rdo->app;
	conf = rdo->conf;
    dk4app_set_log_source_line(rdo->app, lineno);
	pcur = dk4str_start(line, NULL);
	if (NULL != pcur) {									$? ". have text"
		if (dkT('#') != *pcur) {						$? ". not a comment"
			if (dkT('[') == *pcur) {					$? ". scope definition"
				rdo->insc = dk4gra_conf_scope_check(conf, pcur, app);
#if	TRACE_DEBUG
				if (0 != rdo->insc) {					$? ". scope on"
				}
				else {									$? ". scope off"
				}
#endif
			}
			else {										$? ". data line"
				if (0 != rdo->insc) {					$? ". in scope"
					vptr = dk4str_chr(pcur, dkT('='));
					if (NULL != vptr) {						$? ". have value"
						*(vptr++) = dkT('\0');
						vptr = dk4str_start(vptr, NULL);
						if (NULL != vptr) {
							$? ". vptr=%!ds", vptr
							dk4str_normalize(pcur, NULL);
							$? ". pcur=%!ds", pcur
							dk4str_normalize(vptr, NULL);
							$? ". vptr=%!ds", vptr
							res = dk4str_abbr_index(
								dk4gra_conf_cfgfile_key_names, dkT('$'),
								pcur, 0
							);
							$? ". res = %d", res
							switch (res) {
								case  0 : {		/* color */
									res = dk4gra_conf_bool(
										&(conf->color), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  1 : {		/* alpha */
									res = dk4gra_conf_alpha_handling(
										conf, pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  2 : {		/* background */
									res = dk4gra_conf_background(
										&(conf->img_bg_r), &(conf->img_bg_g),
										&(conf->img_bg_b), &(conf->img_bg_f),
										pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  3 : {		/* force background */
									res = dk4gra_conf_bool(
										&(conf->img_bg_f), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  4 : {		/* image interpolation */
									res = dk4gra_conf_bool(
										&(conf->img_int), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  5 : {		/* dct */
									res = dk4gra_conf_bool(
										&(conf->img_dct), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  6 : {		/* dct interpolation */
									res = dk4gra_conf_bool(
										&(conf->img_dct_int), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  7 : {		/* analyze bits per component */
									res = dk4gra_conf_bool(
										&(conf->img_an_bpc), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  8 : {		/* analyze color use */
									res = dk4gra_conf_bool(
										&(conf->img_an_color), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case  9 : {		/* analyze alpha use */
									res = dk4gra_conf_bool(
										&(conf->img_an_alpha), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 10 : {		/* ignore resolution */
									res = dk4gra_conf_bool(
										&(conf->img_ign_res), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 11 : {		/* ps language level */
									res = dk4gra_conf_psll(
										&(conf->ps_level), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 12 : {		/* allow lzw */
									res = dk4gra_conf_bool(
										&(conf->ps_lzw), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 13 : {		/* paper size */
									res = dk4gra_conf_paper_size(
										conf, pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 14 : {		/* duplex */
									res = dk4gra_conf_bool(
										&(conf->doc_duplex), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 15 : {		/* tumble */
									res = dk4gra_conf_bool(
										&(conf->doc_tumble), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 16 : {		/* dsc */
									res = dk4gra_conf_bool(
										&(conf->ps_dsc), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 17 : {		/* rgb to gray */
									res = dk4gra_conf_rgb_to_gray(
										conf,pcur,vptr,app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 18 : {		/* rgb to cmyk */
									res = dk4gra_conf_rgb_to_cmyk(
										conf,pcur,vptr,app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 19 : {		/* ignore aspect ratio */
									res = dk4gra_conf_bool(
										&(conf->img_ign_asp), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 20 : {		/* allow rotate */
									res = dk4gra_conf_bool(
										&(conf->img_rot), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 21 : {		/* resolution */
									res = dk4gra_conf_resolution(
										conf, pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 22 : {		/* X-spline sub segments */
									res = dk4gra_conf_xsss(
										conf, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 23 : {
									res = dk4gra_conf_posdouble(
										&(conf->xslp), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								case 24 : {
									res = dk4gra_conf_posdouble(
										&(conf->xspp), pcur, vptr, app
									);
									if (0 == res) {
										back = DK4_TSP_RES_ERROR;
									}
								} break;
								default : {
									/* ERROR: Unknown key */
									back = DK4_TSP_RES_ERROR;
									dk4gralog_3(
										app, DK4_LL_ERROR, 31, 32, pcur
									);
								} break;
							}
						}
						else {							$? "! no value found"
							dk4gralog_1(app, DK4_LL_ERROR, 46);
						}
					}
					else {								$? "! no value found"
						dk4gralog_1(app, DK4_LL_ERROR, 46);
					}
				}
#if	TRACE_DEBUG
				else {									$? ". not in scope"
				}
#endif
			}
		}
#if	TRACE_DEBUG
		else {											$? ". comment line"
		}
#endif
	}
#if	TRACE_DEBUG
	else {												$? ". empty line ok"
	}
#endif
	$? "- dk4gra_conf_line_handler %d", back
	return back;
}



/**	Apply one configuration file cumulative to the configuration.
	@param	conf		Configuration structure to modify.
	@param	filename	Input file name.
	@param	app			Application structure for diagnostics, may be NULL.
	@return	1 on success, 0 on error.
*/
static
int
dk4gra_conf_apply_file(
	dk4_gra_conf_t			*conf,
	dkChar			const	*filename,
	dk4_app_t				*app
)
{
	char					 ib[4096];
	dkChar					 il[256];
	dk4_tspdk_t				 tsp;
	reader_obj_t			 obj;
	dk4_stream_t			*istrm	=	NULL;
	dkChar			const	*oldsourcefile;
	dk4_um_t				 oldsourceline;
	size_t					 rb;
	int						 res;
	int						 back	=	1;
	int						 cc		=	1;
	$? "+ dk4gra_conf_apply_file \"%!ds\"", TR_STR(filename)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != filename);
#endif
	/*	Initialize reader object
	*/
	obj.conf	= conf;
	obj.app		= app;
	obj.lno		= (dk4_um_t)0UL;
	obj.insc	= 1;
	/*
		Set up logging for file to process
	*/
	oldsourcefile = dk4app_get_log_source_file(app);
    oldsourceline = dk4app_get_log_source_line(app);
    dk4app_set_log_source_file(app, filename);
    dk4app_set_log_source_line(app, (dk4_um_t)0UL);
	dk4gralog_1(app, DK4_LL_PROGRESS, 50);
	/*
		Open input stream
	*/
	istrm = dk4stream_open_file_reader(filename, NULL);
	if (NULL != istrm) {
		res = dk4tspdk_setup_line(
			&tsp, &obj, dk4gra_conf_line_handler,
			il, DK4_SIZEOF(il,dkChar),
			dk4app_get_encoding(app), dk4app_get_file_in_encoding(app), NULL
		);
		if (0 != res) {
			do {
				cc = 0;
				rb = sizeof(ib);
				if (0 != dk4stream_read(ib, &rb, istrm, NULL)) {
					if (0 < rb) {
						res = dk4tspdk_add_bytes(
							&tsp, (const unsigned char *)ib, rb
						);
						if (DK4_TSP_RES_FATAL != res) {
							cc = 1;
						}
						else {
							cc = -1;
							back = 0;
						}
					}
#if	TRACE_DEBUG
					else {										$? ". rb 0"
					}
#endif
				}
#if	TRACE_DEBUG
				else {											$? ". read 0"
				}
#endif
			} while (1 == cc);
			if (0 == cc) {
				res = dk4tspdk_finish(&tsp);
				if (DK4_TSP_RES_FATAL == res) {
					back = 0;
				}
			}
		}
		else {
			/* ERROR: Failed to set up text processing */
			dk4gralog_1(app, DK4_LL_ERROR, 40);
		}
		dk4stream_close(istrm, NULL);
	}
	else {
		/* ERROR: Failed to read file */
		dk4gralog_1(app, DK4_LL_ERROR, 41);
	}
	/*	Set up logging for file processed previously
	*/
    dk4app_set_log_source_line(app, (dk4_um_t)0UL);
	dk4gralog_1(app, DK4_LL_PROGRESS, 51);
	dk4app_set_log_source_file(app, oldsourcefile);
    dk4app_set_log_source_line(app, oldsourceline);
	/*
		Finished, return
	*/
	$? "- dk4gra_conf_apply_file %d", back
	return back;
}



/**	Complete setup by reading configuration files after finding
	driver and purpose.
	@param	conf	Configuration structure to set up.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort program).
*/
static
int
dk4gra_conf_setup_cfgfiles(
	dk4_gra_conf_t			*conf,
	dk4_app_t				*app
)
{
	dkChar		 	 fnb[DK4_MAX_PATH];	/* Buffer to construct cfg file name */
	dkChar	const	*osf;				/* Old source file */
	dk4_um_t		 osl;				/* Old source line */
	size_t		 	 i;					/* Index of current cfg file */
	int			 	 res;				/* Operation result */
	int			 	 back	= 1;

	$? "+ dk4gra_conf_setup_cfgfiles"
#if	DK4_USE_ASSERT
	assert(NULL != conf);
#endif
	/*
		Progress message
	*/
	osf = dk4app_get_log_source_file(app);
	osl = dk4app_get_log_source_line(app);
	dk4app_set_log_source_file(app, NULL);
	dk4app_set_log_source_line(app, (dk4_um_t)0UL);
	dk4gralog_1(app, DK4_LL_PROGRESS, 48);
	for (i = 0; i <= DK4_FS_CONF_MAX; i++) {
		res = dk4app_search_one_config_file(
			fnb, DK4_SIZEOF(fnb,dkChar), app, dk4gra_conf_txt[1],
			(int)i, 1, NULL
		);
		if (0 != res) {
			$? ". process file \"%!ds\"", fnb
			if (0 == dk4gra_conf_apply_file(conf, fnb, app)) {
				back = 0;
			}
		}
	}
	dk4gralog_1(app, DK4_LL_PROGRESS, 49);
	dk4app_set_log_source_file(app, osf);
	dk4app_set_log_source_line(app, osl);
	$? "- dk4gra_conf_setup_cfgfiles %d", back
	return back;
}



/**	Find driver and purpose from string.
	@param	conf	Configuration structure to set up.
	@param	txt		Text containing driver and purpose names.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort).
*/
static
int
dk4gra_conf_driver_purpose(
	dk4_gra_conf_t			*conf,
	dkChar					*txt,
	dk4_app_t				*app
)
{
	dkChar		*ppur	= NULL;
	int			 back	= 0;
	$? "+ dk4gra_conf_driver_purpose \"%!ds\"", TR_STR(txt)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != txt);
#endif
	ppur = dk4str_chr(txt, dkT('.'));
	if (NULL != ppur) {
		*(ppur++) = dkT('\0');
		ppur = dk4str_start(ppur, NULL);
	}
	conf->driver = dk4str_array_index(dk4gra_conf_driver_names, txt, 0);
	$? ". driver = %d", conf->driver
	if (-1 < conf->driver) {
		back = 1;
		if (NULL != ppur) {
			conf->purpose = dk4str_abbr_index(
				dk4gra_conf_purpose_names, dkT('$'), ppur, 0
			);
			$? ". purpose = %d", conf->purpose
			if (0 > conf->purpose) {
				back = 0;
				/* ERROR: Illegal purpose name */
				dk4gralog_3(app, DK4_LL_ERROR, 27, 28, ppur);
			}
		}
		if (DK4_GRA_DRIVER_PS == conf->driver) {
			if (DK4_GRA_PURPOSE_DOCUMENT == conf->purpose) {
				conf->ps_dsc = 1;
			}
		}
	}
	else {
		/* ERROR: Illegal driver name */
		dk4gralog_3(app, DK4_LL_ERROR, 29, 30, txt);
	}
	$? "- dk4gra_conf_driver_purpose %d", back
	return back;
}



static
int
dk4gra_conf_key_value(
	dk4_gra_conf_t			*conf,
	dkChar					*txt,
	int						 cfscope,
	dk4_app_t				*app
)
{
	dkChar		*pcur;
	dkChar		*pnext;
	dkChar		*vptr;
	int			 back	= 1;
	int			 res;
	$? "+ dk4gra_conf_key_value \"%!ds\"", TR_STR(txt)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != txt);
#endif
	pcur = txt;
	while ((0 != back) && (NULL != pcur)) {
		pnext = dk4str_chr(pcur, dkT(','));
		if (NULL != pnext) {
			*(pnext++) = dkT('\0');
			pnext = dk4str_start(pnext, NULL);
		}
		vptr = dk4str_chr(pcur, dkT('='));
		if (NULL != vptr) {
			*(vptr++) = dkT('\0');
			vptr = dk4str_start(vptr, NULL);
		}
		res = dk4str_abbr_index(dk4gra_conf_key_names, dkT('$'), pcur, 0);
		if (-1 < res) {
			if (0 == (cfscope & dk4gra_conf_key_scopes[res])) {
				/* Warning: Ignored configuration key */
				dk4gralog_3(app, DK4_LL_ERROR, 42, 43, pcur);
			}
		}
		switch (res) {
			case  0 : {		/* color */
				res = dk4gra_conf_bool(&(conf->color), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  1 : {		/* alpha */
				res = dk4gra_conf_alpha_handling(conf, pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  2 : {		/* background */
				res = dk4gra_conf_background(
					&(conf->img_bg_r), &(conf->img_bg_g), &(conf->img_bg_b),
					&(conf->img_bg_f), pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  3 : {		/* force background */
				res = dk4gra_conf_bool(&(conf->img_bg_f), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  4 : {		/* image interpolation */
				res = dk4gra_conf_bool(&(conf->img_int), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  5 : {		/* dct */
				res = dk4gra_conf_bool(&(conf->img_dct), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  6 : {		/* dct interpolation */
				res = dk4gra_conf_bool(&(conf->img_dct_int), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  7 : {		/* analyze bits per component */
				res = dk4gra_conf_bool(&(conf->img_an_bpc), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  8 : {		/* analyze color use */
				res = dk4gra_conf_bool(&(conf->img_an_color), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case  9 : {		/* analyze alpha use */
				res = dk4gra_conf_bool(&(conf->img_an_alpha), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 10 : {		/* ignore resolution */
				res = dk4gra_conf_bool(&(conf->img_ign_res), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 11 : {		/* ps language level */
				res = dk4gra_conf_psll(
					&(conf->ps_level), pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 12 : {		/* allow lzw */
				res = dk4gra_conf_bool(&(conf->ps_lzw), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 13 : {		/* paper size */
				res = dk4gra_conf_paper_size(
					conf, pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 14 : {		/* duplex */
				res = dk4gra_conf_bool(&(conf->doc_duplex), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 15 : {		/* tumble */
				res = dk4gra_conf_bool(&(conf->doc_tumble), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 16 : {		/* dsc */
				res = dk4gra_conf_bool(&(conf->ps_dsc), pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 17 : {		/* rgb to gray */
				res = dk4gra_conf_rgb_to_gray(conf, pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 18 : {		/* rgb to cmyk */
				res = dk4gra_conf_rgb_to_cmyk(conf, pcur, vptr, app);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 19 : {
				res = dk4gra_conf_bool(
					&(conf->img_ign_asp), pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 20 : {
				res = dk4gra_conf_bool(
					&(conf->img_rot), pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 21: {
				res = dk4gra_conf_resolution(
					conf, pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 22: {
				res = dk4gra_conf_xsss(
					conf, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 23 : {
				res = dk4gra_conf_posdouble(
					&(conf->xslp), pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			case 24 : {
				res = dk4gra_conf_posdouble(
					&(conf->xspp), pcur, vptr, app
				);
				if (0 == res) {
					back = 0;
				}
			} break;
			default : {
				/* ERROR: Unknown key */
				dk4gralog_3(app, DK4_LL_ERROR, 31, 32, pcur);
				back = 0;
			} break;
		}
		pcur = pnext;
	}
	$? "- dk4gra_conf_key_value %d", back
	return back;
}



/**	Process configuration string.
	@param	conf	Configuration structure to set up.
	@param	txt		Writable copy of configuration string.
	@param	usecfg	Flag: Process configuration files after finding
	driver and purpose.
	@param	cfscope	Configuration scope.
	@param	app		Application structure for diagnostics, may be NULL.
	@return	1 on success (continue processing), 0 on error (abort program).
*/
static
int
dk4gra_conf_setup_txt(
	dk4_gra_conf_t			*conf,
	dkChar					*txt,
	int						 usecfg,
	int						 cfscope,
	dk4_app_t				*app
)
{
	dkChar	*pcur;
	dkChar	*pnext;
	int		 back	= 1;
	$? "+ dk4gra_conf_setup_txt \"%!ds\"", TR_PTR(txt)
#if	DK4_USE_ASSERT
	assert(NULL != conf);
	assert(NULL != txt);
#endif
	pcur = dk4str_start(txt, NULL);
	if (NULL != pcur) {
		pnext = dk4str_chr(pcur, dkT(','));
		if (NULL != pnext) {
			*(pnext++) = dkT('\0');
			pnext = dk4str_start(pnext, NULL);
		}
		back = dk4gra_conf_driver_purpose(conf, pcur, app);
		if (0 != back) {
			if (0 != usecfg) {
				back = dk4gra_conf_setup_cfgfiles(conf, app);
			}
			if (0 != back) {
				back = dk4gra_conf_key_value(conf, pnext, cfscope, app);
			}
		}
	}
	else {
		/* Warning: Empty configuration string */
	}
	$? "- dk4gra_conf_setup_txt %d", back
	return back;
}



int
dk4gra_conf_setup(
	dk4_gra_conf_t			*conf,
	dkChar			const	*txt,
	int						 usecfg,
	int						 cfscope,
	dk4_app_t				*app
)
{
	dkChar	*mycopy;
	int		 back	= 0;
	$? "+ dk4gra_conf_setup"
#if	DK4_USE_ASSERT
	assert(NULL != conf);
#endif
	if (NULL != conf) {
		if ((NULL != txt) || (0 != usecfg)) {
			if (NULL != txt) {
				mycopy = dk4str_dup_app(txt, app);
				if (NULL != mycopy) {
					back = dk4gra_conf_setup_txt(
						conf, mycopy, usecfg, cfscope, app
					);
					dk4mem_free(mycopy);
				}
			}
			else {
				back = dk4gra_conf_setup_cfgfiles(conf, app);
			}
		}
		if (DK4_GRA_PURPOSE_DOCUMENT == conf->purpose) {
			switch (conf->driver) {
				case DK4_GRA_DRIVER_PDF :
				case DK4_GRA_DRIVER_PS :
				case DK4_GRA_DRIVER_PGF : {
					/* Empty by intent */
				} break;
				default : {
					/* ERROR: Driver/purpose combination no allowd */
					back = 1;
					dk4gralog_1(app, DK4_LL_ERROR, 47);
				} break;
			}
		}
	}
	$? "- dk4gra_conf_setup %d", back
	return back;
}



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