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/* pnm.c -- utility functions for testing purposes
* Copyright (C) 2019 SEIKO EPSON Corporation
*
* License: EPSON END USER SOFTWARE LICENSE
* Author : SEIKO EPSON Corporation
*
* This file is part of Image Scan! for Linux.
* It is distributed under the terms of the EPSON END USER SOFTWARE LICENSE.
*
* You should have received a verbatim copy of the EPSON END USER SOFTWARE
* LICENSE along with the software.
*/
#ifndef pnm_h
#define pnm_h
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
void *buffer; /*!< image data */
size_t size; /*!< number of bytes allocated for buffer */
int format; /*!< zero for grayscale, non-zero for RGB */
int32_t bytes_per_line;
int32_t pixels_per_line;
int32_t lines;
int32_t depth;
} pnm;
/*! \brief Reads a PNM image from \a file
*
* Comments in the image file are allowed only between the first
* and second non-comment lines. That is, only a single block of
* consecutive comment lines after the first line is supported.
*
* Memory to hold the image data is acquired using malloc() and the
* caller is responsible for releasing this resource.
*
* Passing the \c NULL pointer for \a file will read from \c stdin.
*/
pnm * read_pnm (const char *file);
/*! \brief Outputs a PNM \a image to \a file
*
* Files produced are reusable for input.
*
* Passing the \c NULL pointer for \a file will result in output on
* \c stdout.
*/
void write_pnm (const char *file, const pnm *image,
const char *comment);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* defined (pnm_h) */
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