gp_stats.h

// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2009-2015 Cyril Hrubis <metan@ucw.cz>
 */
 
/*
 
  Statistic filters.
 
 */
 
#ifndef FILTERS_GP_STATS_H
#define FILTERS_GP_STATS_H
 
#include <filters/gp_filter.h>
 
typedef struct gp_histogram_channel {
        const char *chan_name;
        gp_pixel min;
        gp_pixel max;
        uint32_t len;
        uint32_t hist[];
} gp_histogram_channel;
 
typedef struct gp_histogram {
        gp_pixel_type pixel_type;
        gp_histogram_channel *channels[];
} gp_histogram;
 
gp_histogram *gp_histogram_alloc(gp_pixel_type pixel_type);
 
void gp_histogram_free(gp_histogram *self);
 
gp_histogram_channel *gp_histogram_channel_by_name(gp_histogram *self,
                                                   const char *name);
 
/*
 * Computes histogram. Returns non-zero on failure (i.e. canceled by callback).
 */
int gp_filter_histogram(gp_histogram *self, const gp_pixmap *src,
                        gp_progress_cb *callback);
 
#endif /* FILTERS_GP_STATS_H */