pam.h

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/* Copyright (C) 2013-2016, The Regents of The University of Michigan.
All rights reserved.
This software was developed in the APRIL Robotics Lab under the
direction of Edwin Olson, ebolson@umich.edu. This software may be
available under alternative licensing terms; contact the address above.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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*/

#pragma once

#include <stdint.h>

enum { PAM_GRAYSCALE_ALPHA = 5000, PAM_RGB_ALPHA, PAM_RGB, PAM_GRAYSCALE };

typedef struct pam pam_t;
struct pam
{
    int type; // one of PAM_*

    int width, height; // note, stride always width.
    int depth; // bytes per pixel
    int maxval; // maximum value per channel, e.g. 255 for 8bpp

    int datalen; // in bytes
    uint8_t *data;
};

pam_t *pam_create_from_file(const char *inpath);
int pam_write_file(pam_t *pam, const char *outpath);
void pam_destroy(pam_t *pam);

pam_t *pam_copy(pam_t *pam);

// NB doesn't handle many conversions yet.
pam_t *pam_convert(pam_t *in, int type);