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/*
global definitions for dithering
Copyright (C) 2000 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#ifndef __DITHERDEF_H
#define __DITHERDEF_H
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
extern "C" {
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
}
#ifdef __GNUC__
#if (__GNUC__ < 2 || ( __GNUC__ == 2 && __GNUC_MINOR__ < 91 ) )
#ifndef _AIX
#warning "inline code disabled! (buggy egcs version)"
#undef __NO_MATH_INLINES
#define __NO_MATH_INLINES 1
#endif
#endif
#endif
#include <math.h>
/* Gamma correction stuff */
extern int gammaCorrectFlag;
extern double gammaCorrect;
/* Chroma correction stuff */
extern int chromaCorrectFlag;
extern double chromaCorrect;
#define CB_BASE 1
#define CR_BASE (CB_BASE*CB_RANGE)
#define LUM_BASE (CR_BASE*CR_RANGE)
#define TABTYPE short
#ifdef SIXTYFOUR_BIT
#define PIXVAL long
#else
#define PIXVAL int
#endif
#ifdef SIXTYFOUR_BIT
#define ONE_TWO 1
#else
#define ONE_TWO 2
#endif
#define Min(x,y) (((x) < (y)) ? (x) : (y))
#define Max(x,y) (((x) > (y)) ? (x) : (y))
#define CHROMA_CORRECTION128(x) ((x) >= 0 \
? Min(127, (int)(((x) * chromaCorrect))) \
: Max(-128, (int)(((x) * chromaCorrect))))
#define CHROMA_CORRECTION256D(x) ((x) >= 128 \
? 128.0 + Min(127.0, (((x)-128.0) * chromaCorrect)) \
: 128.0 - Min(128.0, (((128.0-(x))* chromaCorrect))))
#define GAMMA_CORRECTION(x) ((int)(pow((x) / 255.0, 1.0/gammaCorrect)* 255.0))
#define CHROMA_CORRECTION128D(x) ((x) >= 0 \
? Min(127.0, ((x) * chromaCorrect)) \
: Max(-128.0, ((x) * chromaCorrect)))
#define CHROMA_CORRECTION256(x) ((x) >= 128 \
? 128 + Min(127, (int)(((x)-128.0) * chromaCorrect)) \
: 128 - Min(128, (int)((128.0-(x)) * chromaCorrect)))
// Range values for lum, cr, cb.
#define LUM_RANGE 8
#define CR_RANGE 4
#define CB_RANGE 4
#endif
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