source: trunk/JPGPROC/source/gbmsrc/gbmhist.h@ 2

/*

gbmhist.h - Interface to Histogram/Frequency-of-use method of colour reduction

This code has been changed to expose the various steps in performing a
mapping to a frequency-of-use based palette. This is to allow people to write
code that computes a frequency-of-use based palette from a set of bitmaps,
and then map them all to this palette. This original gbm_hist function,
which works on one bitmap, has been rewritten in terms of the lower-level
functions for ease of compatibility.

*/

#ifndef GBMHIST_H
#define GBMHIST_H

typedef void GBMHIST;

extern GBMHIST *gbm_create_hist(
        byte rm, byte gm, byte bm
        );

extern void gbm_delete_hist(GBMHIST *hist);

extern BOOLEAN gbm_add_to_hist(
        GBMHIST *hist,  
        const GBM *gbm, const byte *data24
        );

extern void gbm_pal_hist(
        GBMHIST *hist,
        GBMRGB gbmrgb[],
        int n_cols_wanted
        );

extern void gbm_map_hist(
        GBMHIST *hist,
        const GBM *gbm, const byte *data24, byte *data8
        );

extern BOOLEAN gbm_hist(
        const GBM *gbm, const byte *data24,
        GBMRGB gbmrgb[],
        byte *data8,
        int n_cols_wanted,
        byte rm, byte gm, byte bm
        );

#endif