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/* ppmcmap.h - header file for colormap routines in libppm
*/
/* Color histogram stuff. */
typedef struct colorhist_item* colorhist_vector;
struct colorhist_item
{
pixel color;
int value;
};
typedef struct colorhist_list_item* colorhist_list;
struct colorhist_list_item
{
struct colorhist_item ch;
colorhist_list next;
};
colorhist_vector ppm_computecolorhist ARGS(( pixel** pixels, int cols, int rows, int maxcolors, int* colorsP ));
/* Returns a colorhist *colorsP long (with space allocated for maxcolors. */
void ppm_addtocolorhist ARGS(( colorhist_vector chv, int* colorsP, int maxcolors, pixel* colorP, int value, int position ));
void ppm_freecolorhist ARGS(( colorhist_vector chv ));
/* Color hash table stuff. */
typedef colorhist_list* colorhash_table;
colorhash_table ppm_computecolorhash ARGS(( pixel** pixels, int cols, int rows, int maxcolors, int* colorsP ));
int
ppm_lookupcolor ARGS(( colorhash_table cht, pixel* colorP ));
colorhist_vector ppm_colorhashtocolorhist ARGS(( colorhash_table cht, int maxcolors ));
colorhash_table ppm_colorhisttocolorhash ARGS(( colorhist_vector chv, int colors ));
int ppm_addtocolorhash ARGS(( colorhash_table cht, pixel* colorP, int value ));
/* Returns -1 on failure. */
colorhash_table ppm_alloccolorhash ARGS(( void ));
void ppm_freecolorhash ARGS(( colorhash_table cht ));
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