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57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* ppm.h -
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**
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** Header File
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**
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** Copyright (C) 1989, 1991 by Jef Poskanzer.
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**
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** Permission to use, copy, modify, and distribute this software and its
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** documentation for any purpose and without fee is hereby granted, provided
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** that the above copyright notice appear in all copies and that both that
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** copyright notice and this permission notice appear in supporting
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** documentation. This software is provided "as is" without express or
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** implied warranty.
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*/
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/* Color histogram stuff. */
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typedef struct colorhist_item* colorhist_vector;
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struct colorhist_item
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{
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pixel color;
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int16 value;
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};
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typedef struct colorhist_list_item* colorhist_list;
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struct colorhist_list_item
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{
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struct colorhist_item ch;
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colorhist_list next;
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};
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colorhist_vector ppm_computecolorhist ARGS(( pixel** pixels, int16 cols, int16 rows, int16 maxcolors, int16* colorsP ));
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/* Returns a colorhist *colorsP int32 (with space allocated for maxcolors. */
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void ppm_addtocolorhist ARGS(( colorhist_vector chv, int16* colorsP, int16 maxcolors, pixel* colorP, int16 value, int16 position ));
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void ppm_freecolorhist ARGS(( colorhist_vector chv ));
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/* Color hash table stuff. */
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typedef colorhist_list* colorhash_table;
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colorhash_table ppm_computecolorhash ARGS(( pixel** pixels, int16 cols, int16 rows, int16 maxcolors, int16* colorsP ));
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int16
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ppm_lookupcolor ARGS(( colorhash_table cht, pixel* colorP ));
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colorhist_vector ppm_colorhashtocolorhist ARGS(( colorhash_table cht, int16 maxcolors ));
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colorhash_table ppm_colorhisttocolorhash ARGS(( colorhist_vector chv, int16 colors ));
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int16 ppm_addtocolorhash ARGS(( colorhash_table cht, pixel* colorP, int16 value ));
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/* Returns -1 on failure. */
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colorhash_table ppm_alloccolorhash ARGS(( void ));
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void ppm_freecolorhash ARGS(( colorhash_table cht ));
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