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