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106 lines
3.5 KiB
C
106 lines
3.5 KiB
C
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/* ppm.h -
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**
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** Header File
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**
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** Copyright (C) 1989, 1991 by Jef Poskanzer.
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**
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** Permission to use, copy, modify, and distribute this software and its
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** documentation for any purpose and without fee is hereby granted, provided
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** that the above copyright notice appear in all copies and that both that
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** copyright notice and this permission notice appear in supporting
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** documentation. This software is provided "as is" without express or
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** implied warranty.
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*/
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/*modified by Netscape*/
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#ifndef _PPM_H_
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#define _PPM_H_
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/*#include "pgm.h" JUDGE*/
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typedef unsigned char gray;
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typedef gray pixval;
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#ifdef PPM_PACKCOLORS
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#define PPM_MAXMAXVAL 1023
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typedef uint32 pixel;
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#define PPM_GETR(p) (((p) & 0x3ff00000) >> 20)
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#define PPM_GETG(p) (((p) & 0xffc00) >> 10)
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#define PPM_GETB(p) ((p) & 0x3ff)
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#define PPM_ASSIGN(p,red,grn,blu) (p) = ((pixel) (red) << 20) | ((pixel) (grn) << 10) | (pixel) (blu)
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#define PPM_EQUAL(p,q) ((p) == (q))
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#else /*PPM_PACKCOLORS*/
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#define PPM_MAXMAXVAL PGM_MAXMAXVAL
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typedef struct
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{
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pixval r, g, b;
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} pixel;
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#define PPM_GETR(p) ((p).r)
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#define PPM_GETG(p) ((p).g)
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#define PPM_GETB(p) ((p).b)
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#define PPM_ASSIGN(p,red,grn,blu) do { (p).r = (red); (p).g = (grn); (p).b = (blu); } while ( 0 )
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#define PPM_EQUAL(p,q) ( (p).r == (q).r && (p).g == (q).g && (p).b == (q).b )
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#endif /*PPM_PACKCOLORS*/
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/* Magic constants. */
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#define PPM_MAGIC1 'P'
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#define PPM_MAGIC2 '3'
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#define RPPM_MAGIC2 '6'
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#define PPM_FORMAT (PPM_MAGIC1 * 256 + PPM_MAGIC2)
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#define RPPM_FORMAT (PPM_MAGIC1 * 256 + RPPM_MAGIC2)
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#define PPM_TYPE PPM_FORMAT
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/* Macro for turning a format number into a type number. */
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#define PPM_FORMAT_TYPE(f) ((f) == PPM_FORMAT || (f) == RPPM_FORMAT ? PPM_TYPE : PGM_FORMAT_TYPE(f))
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/* Declarations of routines. */
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void ppm_init ARGS(( int16* argcP, char* argv[] ));
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#define ppm_allocarray( cols, rows ) ((pixel**) pm_allocarray( cols, rows, sizeof(pixel) ))
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#define ppm_allocrow( cols ) ((pixel*) pm_allocrow( cols, sizeof(pixel) ))
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#define ppm_freearray( pixels, rows ) pm_freearray( (char**) pixels, rows )
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#define ppm_freerow( pixelrow ) pm_freerow( (char*) pixelrow )
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pixel** ppm_readppm ARGS(( FILE* file, int16* colsP, int16* rowsP, pixval* maxvalP ));
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void ppm_readppminit ARGS(( FILE* file, int16* colsP, int16* rowsP, pixval* maxvalP, int16* formatP ));
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void ppm_readppmrow ARGS(( FILE* file, pixel* pixelrow, int16 cols, pixval maxval, int16 format ));
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void ppm_writeppm ARGS(( FILE* file, pixel** pixels, int16 cols, int16 rows, pixval maxval, int16 forceplain ));
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void ppm_writeppminit ARGS(( FILE* file, int16 cols, int16 rows, pixval maxval, int16 forceplain ));
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void ppm_writeppmrow ARGS(( FILE* file, pixel* pixelrow, int16 cols, pixval maxval, int16 forceplain ));
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pixel ppm_parsecolor ARGS(( char* colorname, pixval maxval ));
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char* ppm_colorname ARGS(( pixel* colorP, pixval maxval, int16 hexok ));
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extern pixval ppm_pbmmaxval;
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/* This is the maxval used when a PPM program reads a PBM file. Normally
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** it is 1; however, for some programs, a larger value gives better results
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*/
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/* Color scaling macro -- to make writing ppmtowhatever easier. */
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#define PPM_DEPTH(newp,p,oldmaxval,newmaxval) \
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PPM_ASSIGN( (newp), \
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( (int16) PPM_GETR(p) * (newmaxval) + (oldmaxval) / 2 ) / (oldmaxval), \
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( (int16) PPM_GETG(p) * (newmaxval) + (oldmaxval) / 2 ) / (oldmaxval), \
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( (int16) PPM_GETB(p) * (newmaxval) + (oldmaxval) / 2 ) / (oldmaxval) )
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/* Luminance macro. */
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#define PPM_LUMIN(p) ( 0.299 * PPM_GETR(p) + 0.587 * PPM_GETG(p) + 0.114 * PPM_GETB(p) )
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#endif /*_PPM_H_*/
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