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#ifndef XDEVLIN_H
#define XDEVLIN_H
/*
* International Color Consortium color transform expanded support
*
* Author: Graeme W. Gill
* Date: 29/8/01
* Version: 1.00
*
* Copyright 2001 Graeme W. Gill
* All rights reserved.
* This material is licenced under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 :-
* see the License.txt file for licencing details.
*
*/
/*
* This class handles the creation of device chanel linearisation
* curves, given a callback function that maps the device chanels
* to the value that should be linearised.
*
* This class is independent of other icc or icx classes.
*
* Its usual use is to create an Lab linerisation curve
* for native XYZ profiles.
*/
/* The device linearisation class */
struct _xdevlin {
/* Private: */
int di; /* Device dimentionality */
rspl *curves[MXDI]; /* di Linearisation curves */
double clipc[MXDI]; /* center of device range */
double min[MXDI], max[MXDI]; /* Device chanel min/max */
int pol; /* Polarity, 0 for minimise other chanels */
int setch; /* Chanel to set */
double lmin, lmax; /* Linear min & max to rescale */
void *lucntx; /* Lookup context */
void (*lookup) (void *lucntx, double *lin, double *dev); /* Callback function */
/* Public: */
void (*del)(struct _xdevlin *p);
/* Return the linearisation values given the device values */
void (*lin)(struct _xdevlin *p, double *out, double *in);
/* Return the inverse linearisation */
void (*invlin)(struct _xdevlin *p, double *out, double *in);
}; typedef struct _xdevlin xdevlin;
xdevlin *new_xdevlin(
int di, /* Device dimenstionality */
double *min, double *max, /* Min & max range of device values, NULL = 0.0 - 1.0 */
void *cntx, /* Context for callback */
void (*lookup) (void *cntx, double lin[MXDO], double dev[MXDI])
/* Callback function, return linear parameter as lin[0] */
);
#endif /* XDEVLIN_H */
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