io_png.h File Reference

#include <stddef.h>

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Defines
#define	IO_PNG_VERSION   "0.20110608"
Functions
unsigned char *	io_png_read_u8 (const char *fname, size_t *nxp, size_t *nyp, size_t *ncp)
	read a PNG file into a 8bit integer array
unsigned char *	io_png_read_u8_rgb (const char *fname, size_t *nxp, size_t *nyp)
	read a PNG file into a 8bit integer array, converted to RGB
unsigned char *	io_png_read_u8_gray (const char *fname, size_t *nxp, size_t *nyp)
	read a PNG file into a 8bit integer array, converted to gray
float *	io_png_read_f32 (const char *fname, size_t *nxp, size_t *nyp, size_t *ncp)
	read a PNG file into a 32bit float array
float *	io_png_read_f32_rgb (const char *fname, size_t *nxp, size_t *nyp)
	read a PNG file into a 32bit float array, converted to RGB
float *	io_png_read_f32_gray (const char *fname, size_t *nxp, size_t *nyp)
	read a PNG file into a 32bit float array, converted to gray
int	io_png_write_u8 (const char *fname, const unsigned char *data, size_t nx, size_t ny, size_t nc)
	write a 8bit unsigned integer array into a PNG file
int	io_png_write_f32 (const char *fname, const float *data, size_t nx, size_t ny, size_t nc)
	write a float array into a PNG file

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Define Documentation

#define IO_PNG_VERSION   "0.20110608"

Definition at line 8 of file io_png.h.

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Function Documentation

float* io_png_read_f32	(	const char *	fname,
		size_t *	nxp,
		size_t *	nyp,
		size_t *	ncp
	)

read a PNG file into a 32bit float array

The array contains the deinterlaced channels. 1, 2, 4 and 8bit images are converted to float values between 0. and 1., 3., 15. or 255. 16bit images are also downscaled to 8bit before conversion.

Parameters:

	fname	PNG file name
	nxp,nyp,ncp	pointers to variables to be filled with the number of columns, lines and channels of the image

Returns:

pointer to an allocated unsigned char array of pixels, or NULL if an error happens

Definition at line 369 of file io_png.c.

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float* io_png_read_f32_gray	(	const char *	fname,
		size_t *	nxp,
		size_t *	nyp
	)

read a PNG file into a 32bit float array, converted to gray

See io_png_read_f32() for details.

Definition at line 422 of file io_png.c.

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float* io_png_read_f32_rgb	(	const char *	fname,
		size_t *	nxp,
		size_t *	nyp
	)

read a PNG file into a 32bit float array, converted to RGB

See io_png_read_f32() for details.

Definition at line 382 of file io_png.c.

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unsigned char* io_png_read_u8	(	const char *	fname,
		size_t *	nxp,
		size_t *	nyp,
		size_t *	ncp
	)

read a PNG file into a 8bit integer array

The array contains the deinterlaced channels. 1, 2 and 4bit images are converted to 8bit. 16bit images are previously downscaled to 8bit.

Todo:

don't downscale 16bit images.

Parameters:

	fname	PNG file name
	nxp,nyp,ncp	pointers to variables to be filled with the number of columns, lines and channels of the image

Returns:

pointer to an allocated unsigned char array of pixels, or NULL if an error happens

Definition at line 257 of file io_png.c.

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unsigned char* io_png_read_u8_gray	(	const char *	fname,
		size_t *	nxp,
		size_t *	nyp
	)

read a PNG file into a 8bit integer array, converted to gray

See io_png_read_u8() for details.

Definition at line 314 of file io_png.c.

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unsigned char* io_png_read_u8_rgb	(	const char *	fname,
		size_t *	nxp,
		size_t *	nyp
	)

read a PNG file into a 8bit integer array, converted to RGB

See io_png_read_u8() for details.

Definition at line 271 of file io_png.c.

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int io_png_write_f32	(	const char *	fname,
		const float *	data,
		size_t	nx,
		size_t	ny,
		size_t	nc
	)

write a float array into a PNG file

The float values are rounded to 8bit integers, and bounded to [0, 255].

Todo:

handle 16bit images and flexible min/max

Parameters:

	fname	PNG file name
	data	array to write
	nx,ny,nc	number of columns, lines and channels of the image

Returns:

0 if everything OK, -1 if an error occured

Definition at line 680 of file io_png.c.

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int io_png_write_u8	(	const char *	fname,
		const unsigned char *	data,
		size_t	nx,
		size_t	ny,
		size_t	nc
	)

write a 8bit unsigned integer array into a PNG file

Parameters:

	fname	PNG file name
	data	array to write
	nx,ny,nc	number of columns, lines and channels of the image

Returns:

0 if everything OK, -1 if an error occured

Definition at line 660 of file io_png.c.

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