The PNG reader class template. This is the low-level reading interface–use image class or consumer class to actually read images. More...

#include <reader.hpp>

Inheritance diagram for png::reader< istream >:

Public Member Functions
	reader (istream &stream)
	Constructs a reader prepared to read PNG image from a stream.

	~reader ()

void	read_png ()
	Reads the whole PNG data stream into memory. Not particularly useful.

void	read_info ()
	Reads info about PNG image.

void	read_row (byte *bytes)
	Reads a row of image data at a time.

void	read_end_info ()
	Reads ending info about PNG image.

void	update_info ()

Public Member Functions inherited from png::io_base
	io_base (png_struct *png)

	~io_base ()

png_struct *	get_png_struct () const

info &	get_info ()

info const &	get_info () const

image_info const &	get_image_info () const

void	set_image_info (image_info const &info)

end_info &	get_end_info ()

end_info const &	get_end_info () const

uint_32	get_width () const

void	set_width (uint_32 width)

uint_32	get_height () const

void	set_height (uint_32 height)

color_type	get_color_type () const

void	set_color_type (color_type color_space)

int	get_bit_depth () const

void	set_bit_depth (int bit_depth)

interlace_type	get_interlace_type () const

void	set_interlace_type (interlace_type interlace)

compression_type	get_compression_type () const

void	set_compression_type (compression_type compression)

filter_type	get_filter_type () const

void	set_filter_type (filter_type filter)

bool	has_chunk (chunk id)

void	set_gray_1_2_4_to_8 () const

void	set_palette_to_rgb () const

void	set_tRNS_to_alpha () const

void	set_bgr () const

void	set_gray_to_rgb () const

void	set_rgb_to_gray (rgb_to_gray_error_action error_action=rgb_to_gray_silent, double red_weight=-1.0, double green_weight=-1.0) const

void	set_rgb_to_gray (rgb_to_gray_error_action error_action=rgb_to_gray_silent, fixed_point red_weight=-1, fixed_point green_weight=-1) const

void	set_strip_alpha () const

void	set_swap_alpha () const

void	set_invert_alpha () const

void	set_filler (uint_32 filler, filler_type type) const

void	set_add_alpha (uint_32 filler, filler_type type) const

void	set_swap () const

void	set_packing () const

void	set_packswap () const

void	set_shift (byte red_bits, byte green_bits, byte blue_bits, byte alpha_bits=0) const

void	set_shift (byte gray_bits, byte alpha_bits=0) const

int	set_interlace_handling () const

void	set_invert_mono () const

void	set_strip_16 () const

void	set_read_user_transform (png_user_transform_ptr transform_fn)

void	set_user_transform_info (void *info, int bit_depth, int channels)

Additional Inherited Members
Protected Member Functions inherited from png::io_base
void *	get_io_ptr () const

void	set_error (char const *message)

void	reset_error ()

bool	is_error () const

void	raise_error ()

Static Protected Member Functions inherited from png::io_base
static void	raise_error (png_struct png, char const message)

Protected Attributes inherited from png::io_base
png_struct *	m_png

info	m_info

end_info	m_end_info

std::string	m_error

Detailed Description

template<class istream>
class png::reader< istream >

The PNG reader class template. This is the low-level reading interface–use image class or consumer class to actually read images.

The istream template parameter specifies the type of input stream to work with. The istream class should implement the minimum of the following interface:

class my_istream
{
public:
    void read(char*, size_t);
    bool good();
};

With the semantics similar to the std::istream. Naturally, std::istream fits this requirement and can be used with the reader class as is.

See also: image, consumer, writer, io_base

Constructor & Destructor Documentation

◆ reader()

template<class istream >

png::reader< istream >::reader ( istream & stream )

inlineexplicit

Constructs a reader prepared to read PNG image from a stream.

References png::io_base::m_png, and png::reader< istream >::reader().

Referenced by png::reader< istream >::read_end_info(), png::reader< istream >::read_info(), png::reader< istream >::read_png(), png::reader< istream >::read_row(), png::reader< istream >::reader(), and png::reader< istream >::~reader().

◆ ~reader()

template<class istream >

png::reader< istream >::~reader ( )

inline

References png::info_base::get_png_info_ptr(), png::io_base::m_end_info, png::io_base::m_info, png::io_base::m_png, and png::reader< istream >::reader().

Member Function Documentation

◆ read_png()

template<class istream >

void png::reader< istream >::read_png ( )

inline

Reads the whole PNG data stream into memory. Not particularly useful.

References png::info_base::get_png_info(), png::io_base::m_error, png::io_base::m_info, png::io_base::m_png, and png::reader< istream >::reader().

◆ read_info()

template<class istream >

void png::reader< istream >::read_info ( )

inline

Reads info about PNG image.

References png::io_base::m_error, png::io_base::m_info, png::io_base::m_png, png::info::read(), and png::reader< istream >::reader().

Referenced by png::consumer< pixel, pixcon, info_holder, interlacing_supported >::read().

◆ read_row()

template<class istream >

void png::reader< istream >::read_row ( byte * bytes )

inline

Reads a row of image data at a time.

References png::io_base::m_error, png::io_base::m_png, and png::reader< istream >::reader().

◆ read_end_info()

template<class istream >

void png::reader< istream >::read_end_info ( )

inline

Reads ending info about PNG image.

References png::io_base::m_end_info, png::io_base::m_error, png::io_base::m_png, png::end_info::read(), and png::reader< istream >::reader().

Referenced by png::consumer< pixel, pixcon, info_holder, interlacing_supported >::read().

◆ update_info()

template<class istream >

void png::reader< istream >::update_info ( )

inline

References png::io_base::m_info, and png::info::update().

Referenced by png::consumer< pixel, pixcon, info_holder, interlacing_supported >::read().

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

reader.hpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ reader()

◆ ~reader()

Member Function Documentation

◆ read_png()

◆ read_info()

◆ read_row()

◆ read_end_info()

◆ update_info()