enc_png.c File Reference

This program writes PNG stream to memory. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>

Go to the source code of this file.

Typedefs
typedef int	g2int
	Long integer type. More...
typedef struct png_stream	png_stream
	location to write PNG stream. More...

Functions
int	enc_png (char *data, g2int *width, g2int *height, g2int *nbits, char *pngbuf)
	create png_structs to write png stream into memory. More...
static void	user_flush_data (png_structp png_ptr)
	Dummy Custom flush function. More...
static void	user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
	Custom write function used to that libpng will write to memory location instead of a file on disk. More...

Detailed Description

This program writes PNG stream to memory.

Author

Stephen Gilbert

Definition in file enc_png.c.

Typedef Documentation

g2int

typedef int g2int

Long integer type.

Definition at line 12 of file enc_png.c.

png_stream

typedef struct png_stream png_stream

location to write PNG stream.

Definition at line 12 of file enc_png.c.

Function Documentation

enc_png()

int enc_png	(	char *	data,
		g2int *	width,
		g2int *	height,
		g2int *	nbits,
		char *	pngbuf
	)

create png_structs to write png stream into memory.

Parameters

data	data.
width	width.
height	height.
nbits	number of bits.
pngbuf	PNG buffer.

Returns

pnglen the length of png stream

Author

Stephen Gilbert

Definition at line 79 of file enc_png.c.

References drstemplates::j, user_flush_data(), and user_write_data().

Referenced by pngpack().

user_flush_data()

static void user_flush_data ( png_structp  png_ptr )

static

Dummy Custom flush function.

Parameters

png_ptr

Pointer to PNG struct.

Author

Stephen Gilbert

Definition at line 62 of file enc_png.c.

Referenced by enc_png().

user_write_data()

static void user_write_data ( png_structp  png_ptr, png_bytep  data, png_uint_32  length  )

static

Custom write function used to that libpng will write to memory location instead of a file on disk.

Parameters

png_ptr	pointer
data	data
length	length

Author

Stephen Gilbert

Definition at line 40 of file enc_png.c.

Referenced by enc_png().