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/* Palette-manipulation functions functions for xcftools
*
* Copyright (C) 2006 Henning Makholm
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef PALETTE_H
#define PALETTE_H
#include "xcftools.h"
#include "pixels.h"
#define MAX_PALETTE 256
extern rgba palette[MAX_PALETTE] ;
extern unsigned paletteSize ;
typedef uint8_t index_t ;
void init_palette_hash(void);
/* lookup_or_intern() returns a negative number if there is no room
* for the color in the palette.
*/
int lookup_or_intern(rgba color);
/* palettify_row will convert a row of 'rgba' values into a packed row
* of 'uint8_t' indces. If it succeeds without running out of colormap
* entries, it returns nonzero. On the other hand if it does run out
* of colormap entries it returns zero _and_ undoes the conversions
* already done, so that the row is still a full row of 'rgba' values
* afterwards.
*/
int palettify_row(rgba *row,unsigned ncols);
/* palettify_rows is like palettify_rows, but works on several
* rows at a time.
*/
int palettify_rows(rgba *rows[],unsigned ncols,unsigned nlines);
#endif /* PALETTE_H */
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