/* ppmcmapx.h - colormap routines */
/* Last edited on 2004-11-07 00:34:39 by stolfi */ 

#ifndef ppmcmapx_H
#define ppmcmapx_H

#include <ppm.h>

/* 
  RGB COLOR HISTOGRAMS */

typedef struct ppm_cmapx_hist_item* ppm_cmapx_hist_vector;
struct ppm_cmapx_hist_item
  { pixel color;
    int value;
  };

typedef struct ppm_cmapx_list_item* ppm_cmapx_list;
struct ppm_cmapx_list_item
  { struct ppm_cmapx_hist_item ch;
    ppm_cmapx_list next;
  };

ppm_cmapx_hist_vector ppm_cmapx_hist_build ARGS(( pixel** pixels, int cols, int rows, int maxcolors, int* colorsP ));
/* Returns a colorhist *colorsP long (with space allocated for maxcolors. */

void ppm_cmapx_hist_add ARGS(( ppm_cmapx_hist_vector chv, int* colorsP, int maxcolors, pixel* colorP, int value, int position ));

void ppm_cmapx_hist_free ARGS(( ppm_cmapx_hist_vector chv ));

/*
  HASH TABLE FOR RGB COLORS */

typedef ppm_cmapx_list* ppm_cmapx_table;

ppm_cmapx_table ppm_cmapx_table_build ARGS(( pixel** pixels, int cols, int rows, int maxcolors, int* colorsP ));

int
ppm_cmapx_table_lookup ARGS(( ppm_cmapx_table cht, pixel* colorP ));

ppm_cmapx_hist_vector ppm_cmapx_table_to_hist ARGS(( ppm_cmapx_table cht, int maxcolors ));
ppm_cmapx_table ppm_cmapx_hist_to_table ARGS(( ppm_cmapx_hist_vector chv, int colors ));

int ppm_cmapx_table_add ARGS(( ppm_cmapx_table cht, pixel* colorP, int value ));
/* Returns -1 on failure. */

ppm_cmapx_table ppm_cmapx_table_alloc ARGS(( void ));

void ppm_cmapx_table_free ARGS(( ppm_cmapx_table cht ));

#endif