PNG I/O header

/*******************************************************************************
*
* png_rgba.h : PNG file I/O in (8) bits per channel RGBA format:
*
* Copyright (c) Brett Hale 2008, 2012. Public Domain.
*
*******************************************************************************/


#ifndef _PNG_RGBA_H
#define _PNG_RGBA_H

#if defined (__cplusplus) /* ISO C declaration scope: */

#define _PNG_RGBA_INIT_DECL extern "C" {
#define _PNG_RGBA_FINI_DECL }

#else

#define _PNG_RGBA_INIT_DECL
#define _PNG_RGBA_FINI_DECL

#endif /* defined (__cplusplus) */


#include <stddef.h>
#include <stdlib.h>

#include <stdio.h> /* ISO C : standard I/O library. */


_PNG_RGBA_INIT_DECL


/******************************************************************************/

/* load a PNG image using an opened file stream. return the image data
 * as a (malloc) allocated RGBA image buffer, with the width: (w), and
 * height: (h). return (0) on success: */

/* if the operation fails, then the dimensions are set to (0), and the
 * buffer is set to (NULL). */

/* the operation fails if the image has zero area, or if the number of
 * pixels exceeds PNG_RGBA_PIXEL_LIMIT. */

/* asserts that 'unsigned int' has a width of at least 32 bits. */


#define PNG_RGBA_PIXEL_LIMIT (0x1000000)

int png_rgba_load (FILE *, unsigned *w, unsigned *h, unsigned char **);


/******************************************************************************/

/* save an RGBA image buffer, with the width: (w), and height: (h), as
 * a PNG image, using an opened file stream. return (0) on success: */

/* the operation fails if the image has zero area, or if the number of
 * pixels exceeds PNG_RGBA_PIXEL_LIMIT. */

/* asserts that 'unsigned int' has a width of at least 32 bits. */


int png_rgba_save (FILE *, unsigned w, unsigned h, const unsigned char *);


/******************************************************************************/


_PNG_RGBA_FINI_DECL


#endif /* _PNG_RGBA_H */