text: /*
  uPNG -- derived from LodePNG version 20100808
  
  Copyright (c) 2005-2010 Lode Vandevenne
  Copyright (c) 2010 Sean Middleditch
  
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.
  
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
  
  		1. The origin of this software must not be misrepresented; you must not
  		claim that you wrote the original software. If you use this software
  		in a product, an acknowledgment in the product documentation would be
  		appreciated but is not required.
  
  		2. Altered source versions must be plainly marked as such, and must not be
  		misrepresented as being the original software.
  
  		3. This notice may not be removed or altered from any source
  		distribution.
  */
  
  #if !defined(UPNG_H)
  #define UPNG_H
  
  typedef enum upng_error {
  	UPNG_EOK			= 0, /* success (no error) */
  	UPNG_ENOMEM			= 1, /* memory allocation failed */
  	UPNG_ENOTFOUND		= 2, /* resource not found (file missing) */
  	UPNG_ENOTPNG		= 3, /* image data does not have a PNG header */
  	UPNG_EMALFORMED		= 4, /* image data is not a valid PNG image */
  	UPNG_EUNSUPPORTED	= 5, /* critical PNG chunk type is not supported */
  	UPNG_EUNINTERLACED	= 6, /* image interlacing is not supported */
  	UPNG_EUNFORMAT		= 7, /* image color format is not supported */
  	UPNG_EPARAM			= 8  /* invalid parameter to method call */
  } upng_error;
  
  typedef enum upng_format {
  	UPNG_BADFORMAT,
  	UPNG_RGB8,
  	UPNG_RGB16,
  	UPNG_RGBA8,
  	UPNG_RGBA16,
  	UPNG_LUMINANCE1,
  	UPNG_LUMINANCE2,
  	UPNG_LUMINANCE4,
  	UPNG_LUMINANCE8,
  	UPNG_LUMINANCE_ALPHA1,
  	UPNG_LUMINANCE_ALPHA2,
  	UPNG_LUMINANCE_ALPHA4,
  	UPNG_LUMINANCE_ALPHA8
  } upng_format;
  
  typedef struct upng_t upng_t;
  
  upng_t*		upng_new_from_bytes	(const unsigned char* buffer, unsigned long size);
  upng_t*		upng_new_from_file	(const char* path);
  void		upng_free			(upng_t* upng);
  
  upng_error	upng_header			(upng_t* upng);
  upng_error	upng_decode			(upng_t* upng);
  
  upng_error	upng_get_error		(const upng_t* upng);
  unsigned	upng_get_error_line	(const upng_t* upng);
  
  unsigned	upng_get_width		(const upng_t* upng);
  unsigned	upng_get_height		(const upng_t* upng);
  unsigned	upng_get_bpp		(const upng_t* upng);
  unsigned	upng_get_bitdepth	(const upng_t* upng);
  unsigned	upng_get_components	(const upng_t* upng);
  unsigned	upng_get_pixelsize	(const upng_t* upng);
  upng_format	upng_get_format		(const upng_t* upng);
  
  const unsigned char*	upng_get_buffer		(const upng_t* upng);
  unsigned				upng_get_size		(const upng_t* upng);
  
  #endif /*defined(UPNG_H)*/
  