1/*
 2 * Copyright (c) 2014-2016 Hayaki Saito
 3 *
 4 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 5 * this software and associated documentation files (the "Software"), to deal in
 6 * the Software without restriction, including without limitation the rights to
 7 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 8 * the Software, and to permit persons to whom the Software is furnished to do so,
 9 * subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in all
12 * copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
16 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
17 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
18 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 */
21
22#ifndef LIBSIXEL_DITHER_H
23#define LIBSIXEL_DITHER_H
24
25#include <sixel.h>
26
27/* dither context object */
28struct sixel_dither {
29    unsigned int ref;               /* reference counter */
30    unsigned char *palette;         /* palette definition */
31    unsigned short *cachetable;     /* cache table */
32    int reqcolors;                  /* requested colors */
33    int ncolors;                    /* active colors */
34    int origcolors;                 /* original colors */
35    int optimized;                  /* pixel is 15bpp compressable */
36    int optimize_palette;           /* minimize palette size */
37    int complexion;                 /* for complexion correction */
38    int bodyonly;                   /* do not output palette section if true */
39    int method_for_largest;         /* method for finding the largest dimention 
40                                       for splitting */
41    int method_for_rep;             /* method for choosing a color from the box */
42    int method_for_diffuse;         /* method for diffusing */
43    int quality_mode;               /* quality of histogram */
44    int keycolor;                   /* background color */
45    int pixelformat;                /* pixelformat for internal processing */
46    sixel_allocator_t *allocator;   /* allocator */
47};
48
49#ifdef __cplusplus
50extern "C" {
51#endif
52
53/* apply palette */
54sixel_index_t *
55sixel_dither_apply_palette(struct sixel_dither /* in */ *dither,
56                           unsigned char       /* in */ *pixels,
57                           int                 /* in */ width,
58                           int                 /* in */ height);
59
60#if HAVE_TESTS
61int
62sixel_frame_tests_main(void);
63#endif
64
65#ifdef __cplusplus
66}
67#endif
68
69#endif /* LIBSIXEL_DITHER_H */
70
71/* emacs Local Variables:      */
72/* emacs mode: c               */
73/* emacs tab-width: 4          */
74/* emacs indent-tabs-mode: nil */
75/* emacs c-basic-offset: 4     */
76/* emacs End:                  */
77/* vim: set expandtab ts=4 sts=4 sw=4 : */
78/* EOF */