pnm_cod.h

/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved.
 */
 
/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer License Version 2.0
 * 
 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 * 
 * All rights reserved.
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 */
 
/*
 * Portable Pixmap/Graymap Format Support
 *
 * $Id$
 */
 
#ifndef PNM_COD_H
#define PNM_COD_H
 
/******************************************************************************\
* Includes.
\******************************************************************************/
 
#include "jasper/jas_types.h"
 
/******************************************************************************\
* Constants.
\******************************************************************************/
 
/* Magic numbers. */
#define PNM_MAGIC_TXTPBM        0x5031 /* Text Portable BitMap (P1) */
#define PNM_MAGIC_TXTPGM        0x5032 /* Text Portable GrayMap (P2) */
#define PNM_MAGIC_TXTPPM        0x5033 /* Text Portable PixMap (P3) */
#define PNM_MAGIC_BINPBM        0x5034 /* Binary Portable BitMap (P4) */
#define PNM_MAGIC_BINPGM        0x5035 /* Binary Portable GrayMap (P5) */
#define PNM_MAGIC_BINPPM        0x5036 /* Binary Portable PixMap (P6) */
#define PNM_MAGIC_PAM           0x5037 /* PAM (P7) */
 
/* Type of image data. */
#define PNM_TYPE_INVALID        0
#define PNM_TYPE_PBM    1 /* BitMap */
#define PNM_TYPE_PGM    2 /* GrayMap */
#define PNM_TYPE_PPM    3 /* PixMap */
 
/* Format of image data. */
#define PNM_FMT_TXT     0 /* Text */
#define PNM_FMT_BIN     1 /* Binary */
 
#define PNM_MAXLINELEN  79
 
#define PNM_TUPLETYPE_UNKNOWN   0
#define PNM_TUPLETYPE_MONO      1
#define PNM_TUPLETYPE_GRAY      2
#define PNM_TUPLETYPE_GRAYA     3
#define PNM_TUPLETYPE_RGB       4
#define PNM_TUPLETYPE_RGBA      5
 
/******************************************************************************\
* Types.
\******************************************************************************/
 
/* File header. */
 
typedef struct {
 
        int magic;
        /* The magic number. */
 
        int width;
        /* The image width. */
 
        int height;
        /* The image height. */
 
        int numcmpts;
 
        int maxval;
        /* The maximum allowable sample value. */
 
#if 0
        int tupletype;
#endif
 
        bool sgnd;
        /* The sample data is signed. */
 
} pnm_hdr_t;
 
/******************************************************************************\
* Functions.
\******************************************************************************/
 
int pnm_type(uint_fast16_t magic);
/* Determine type (i.e., PGM or PPM) from magic number. */
 
int pnm_fmt(uint_fast16_t magic);
/* Determine format (i.e., text or binary) from magic number. */
 
int pnm_maxvaltodepth(uint_fast32_t maxval);
/* Determine depth (i.e., precision) from maximum value. */
 
#define PNM_ONES(n) \
        (((n) < 32) ? ((1UL << (n)) - 1) : 0xffffffffUL)
#endif