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panda/src/pnmimage/pnmimage_base.h

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// Filename: pnmimage_base.h
// Created by:  drose (14Jun00)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#ifndef PNMIMAGE_BASE_H
#define PNMIMAGE_BASE_H

// This header file make a few typedefs and other definitions
// essential to everything in the PNMImage package.

#include "pandabase.h"

#include <string>

// Since we no longer include pnm.h directly, we have to provide our
// own definitions for xel and xelval.

// For now, we have PGM_BIGGRAYS defined, which gives us 16-bit
// channels.  Undefine this if you have memory problems and need to
// use 8-bit channels instead.
#define PGM_BIGGRAYS

#ifdef PGM_BIGGRAYS
typedef unsigned short gray;
#define PGM_MAXMAXVAL 65535
#else  // PGM_BIGGRAYS
typedef unsigned char gray;
#define PGM_MAXMAXVAL 255
#endif  // PGM_BIGGRAYS

#define PNM_MAXMAXVAL PGM_MAXMAXVAL

struct pixel {
  gray r, g, b;
};

typedef gray pixval;
typedef pixel xel;
typedef gray xelval;

// These macros are borrowed from ppm.h.

#define PPM_GETR(p) ((p).r)
#define PPM_GETG(p) ((p).g)
#define PPM_GETB(p) ((p).b)

#define PPM_PUTR(p,red) ((p).r = (red))
#define PPM_PUTG(p,grn) ((p).g = (grn))
#define PPM_PUTB(p,blu) ((p).b = (blu))

#define PPM_ASSIGN(p,red,grn,blu) { (p).r = (red); (p).g = (grn); (p).b = (blu); }
#define PPM_EQUAL(p,q) ( (p).r == (q).r && (p).g == (q).g && (p).b == (q).b )
#define PNM_ASSIGN1(x,v) PPM_ASSIGN(x,0,0,v)

#define PPM_DEPTH(newp,p,oldmaxval,newmaxval) \
    PPM_ASSIGN( (newp), \
        ( (int) PPM_GETR(p) * (newmaxval) + (oldmaxval) / 2 ) / (oldmaxval), \
        ( (int) PPM_GETG(p) * (newmaxval) + (oldmaxval) / 2 ) / (oldmaxval), \
        ( (int) PPM_GETB(p) * (newmaxval) + (oldmaxval) / 2 ) / (oldmaxval) )


// pnm defines these functions, and it's easier to emulate them than
// to rewrite the code that calls them.
EXPCL_PANDA void pm_message(const char *format, ...);
EXPCL_PANDA void pm_error(const char *format, ...);  // doesn't return.

EXPCL_PANDA int pm_maxvaltobits(int maxval);
EXPCL_PANDA int pm_bitstomaxval(int bits);

EXPCL_PANDA char *pm_allocrow(int cols, int size);
EXPCL_PANDA void pm_freerow(char *itrow);

EXPCL_PANDA int pm_readbigshort(istream *in, short *sP);
EXPCL_PANDA int pm_writebigshort(ostream *out, short s);
EXPCL_PANDA int pm_readbiglong(istream *in, long *lP);
EXPCL_PANDA int pm_writebiglong(ostream *out, long l);
EXPCL_PANDA int pm_readlittleshort(istream *in, short *sP);
EXPCL_PANDA int pm_writelittleshort(ostream *out, short s);
EXPCL_PANDA int pm_readlittlelong(istream *in, long *lP);
EXPCL_PANDA int pm_writelittlelong(ostream *out, long l);


// These ratios are used to compute the brightness of a colored pixel; they
// define the relative contributions of each of the components.
static const double lumin_red = 0.299;
static const double lumin_grn = 0.587;
static const double lumin_blu = 0.114;


#endif

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