Portable Network Graphics file format. More...

#include <png.h>

Public Types
enum	error { PNG_EOK = 0 , PNG_ENOMEM = 1 , PNG_ENOTFOUND = 2 , PNG_ENOTPNG = 3 , PNG_EMALFORMED = 4 , PNG_EUNSUPPORTED = 5 , PNG_EUNINTERLACED = 6 , PNG_EUNFORMAT = 7 , PNG_EPARAM = 8 , PNG_EIOERROR = 9 }

enum	format { BADFORMAT , RGB8 , RGB16 , RGBA8 , RGBA16 , LUMINANCE1 , LUMINANCE2 , LUMINANCE4 , LUMINANCE8 , LUMINANCE_ALPHA1 , LUMINANCE_ALPHA2 , LUMINANCE_ALPHA4 , LUMINANCE_ALPHA8 }

Public Member Functions
	PNG (const unsigned char *buffer, unsigned long size)
	Load PNG image from memory. More...

	PNG (const char *path)
	Load PNG image from file system. More...

	~PNG ()
	Free memory reserved for PNG image.

unsigned	get_width () const
	Width of image (pixels)

unsigned	get_height () const
	Height of image (pixels)

unsigned	get_bpp () const
	Bits per pixel.

unsigned	get_bitdepth () const
	Depth of color (bits pro color channel)

unsigned	get_components () const
	Number of components per pixel.

unsigned	get_pixelsize () const
	Number of bytes per pixel.

enum format	get_format () const
	Retrieve the format.

const unsigned char *	get_buffer ()
	Image buffer address. More...

unsigned	get_size ()
	Size of image buffer. More...

Protected Member Functions
enum error	header ()
	Extract header (image attributes)

enum error	decode ()
	Decode whole image.

Detailed Description

Portable Network Graphics file format.

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Member Enumeration Documentation

◆ error

enum PNG::error

Enumerator
PNG_EOK	success (no error)
PNG_ENOMEM	memory allocation failed
PNG_ENOTFOUND	resource not found (file missing)
PNG_ENOTPNG	image data does not have a PNG header
PNG_EMALFORMED	image data is not a valid PNG image
PNG_EUNSUPPORTED	critical PNG chunk type is not supported
PNG_EUNINTERLACED	image interlacing is not supported
PNG_EUNFORMAT	image color format is not supported
PNG_EPARAM	invalid parameter to method call
PNG_EIOERROR	Filesystem issues.

◆ format

enum PNG::format

Enumerator
BADFORMAT	Invalid format.
RGB8	24bit RGB (8bit per color)
RGB16	48bit RGB (16bit per color)
RGBA8	32bit RGB (including alpha channel)
RGBA16	64bit RGB (including alpha channel)
LUMINANCE1	Monochrome (black-white)
LUMINANCE2	four shades of gray (2bit gray scale)
LUMINANCE4	16 shades of gray (4bit gray scale)
LUMINANCE8	8bit gray scale
LUMINANCE_ALPHA1	Monochrome (black-white) with alpha channel.
LUMINANCE_ALPHA2	2bit gray scale with alpha channel
LUMINANCE_ALPHA4	4bit gray scale with alpha channel
LUMINANCE_ALPHA8	8bit gray scale with alpha channel

Constructor & Destructor Documentation

◆ PNG() [1/2]

PNG::PNG	(	const unsigned char *	buffer,
		unsigned long	size
	)

Load PNG image from memory.

Parameters

buffer	pointer to memory buffer
size	size of memory buffer

◆ PNG() [2/2]

PNG::PNG ( const char * path )

explicit

Load PNG image from file system.

Parameters

path	path to file

Member Function Documentation

◆ get_buffer()

const unsigned char* PNG::get_buffer ( )

inline

Image buffer address.

Returns: Pointer to image buffer

◆ get_size()

unsigned PNG::get_size ( )

inline

Size of image buffer.

Returns: Total size of image buffer in bytes

The documentation for this class was generated from the following files:

utils/png.h
utils/png.cc

Public Types

Public Member Functions

Protected Member Functions