gp_apply_tables.h

// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2009-2013 Cyril Hrubis <metan@ucw.cz>
 */
 
/*
 
  Applies per-channel tables on a pixmap pixels. Used for fast point filters
  implementation.
 
 */
 
#ifndef FILTERS_GP_APPLY_TABLES_H
#define FILTERS_GP_APPLY_TABLES_H
 
#include <filters/gp_filter.h>
 
/*
 * Per-channel lookup tables.
 */
typedef struct gp_filter_tables {
        gp_pixel *table[GP_PIXEL_CHANS_MAX];
        int free_table:1;
} gp_filter_tables;
 
/*
 * Generic point filter, applies corresponding table on bitmap.
 */
int gp_filter_tables_apply(const gp_pixmap *const src,
                           gp_coord x_src, gp_coord y_src,
                           gp_size w_src, gp_size h_src,
                           gp_pixmap *dst,
                           gp_coord x_dst, gp_coord y_dst,
                           const gp_filter_tables *const tables,
                           gp_progress_cb *callback);
 
/*
 * Aloocates and initializes tables.
 */
int gp_filter_tables_init(gp_filter_tables *self, const gp_pixmap *pixmap);
 
/*
 * Allocates and initializes table structure and tables.
 */
gp_filter_tables *gp_filter_tables_alloc(const gp_pixmap *pixmap);
 
/*
 * Frees point filter tables.
 */
void gp_filter_tables_free(gp_filter_tables *self);
 
#endif /* FILTERS_GP_APPLY_TABLES_H */