/usr/include/gutenprint/channel.h is in libgutenprint-dev 5.2.10-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* "$Id: channel.h,v 1.6 2005/07/03 22:13:36 rlk Exp $"
*
* libgimpprint header.
*
* Copyright 1997-2000 Michael Sweet (mike@easysw.com) and
* Robert Krawitz (rlk@alum.mit.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Revision History:
*
* See ChangeLog
*/
/**
* @file gutenprint/channel.h
* @brief Channel functions.
*/
/*
* This file must include only standard C header files. The core code must
* compile on generic platforms that don't support glib, gimp, gtk, etc.
*/
#ifndef GUTENPRINT_CHANNEL_H
#define GUTENPRINT_CHANNEL_H
#ifdef __cplusplus
extern "C" {
#endif
extern void stp_channel_reset(stp_vars_t *v);
extern void stp_channel_reset_channel(stp_vars_t *v, int channel);
extern void stp_channel_add(stp_vars_t *v, unsigned channel,
unsigned subchannel, double value);
extern double stp_channel_get_value(stp_vars_t *v, unsigned channel,
unsigned subchannel);
extern void stp_channel_set_density_adjustment(stp_vars_t *v,
int color, int subchannel,
double adjustment);
extern double stp_channel_get_density_adjustment(stp_vars_t *v,
int color, int subchannel);
extern void stp_channel_set_ink_limit(stp_vars_t *v, double limit);
extern double stp_channel_get_ink_limit(stp_vars_t *v);
extern void stp_channel_set_cutoff_adjustment(stp_vars_t *v,
int color, int subchannel,
double adjustment);
extern double stp_channel_get_cutoff_adjustment(stp_vars_t *v,
int color, int subchannel);
extern void stp_channel_set_black_channel(stp_vars_t *v, int channel);
extern int stp_channel_get_black_channel(stp_vars_t *v);
extern void stp_channel_set_gloss_channel(stp_vars_t *v, int channel);
extern int stp_channel_get_gloss_channel(stp_vars_t *v);
extern void stp_channel_set_gloss_limit(stp_vars_t *v, double limit);
extern double stp_channel_get_gloss_limit(stp_vars_t *v);
extern void stp_channel_set_curve(stp_vars_t *v, int channel,
const stp_curve_t *curve);
extern const stp_curve_t *stp_channel_get_curve(stp_vars_t *v, int channel);
extern void stp_channel_set_gcr_curve(stp_vars_t *v, const stp_curve_t *curve);
extern const stp_curve_t *stp_channel_get_gcr_curve(stp_vars_t *v);
extern void stp_channel_initialize(stp_vars_t *v, stp_image_t *image,
int input_channel_count);
extern void stp_channel_convert(const stp_vars_t *v, unsigned *zero_mask);
extern unsigned short * stp_channel_get_input(const stp_vars_t *v);
extern unsigned short * stp_channel_get_output(const stp_vars_t *v);
#ifdef __cplusplus
}
#endif
#endif /* GUTENPRINT_CHANNEL_H */
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