Scroll to navigation

enc_png.c(3) NCEPLIBS-g2c enc_png.c(3)

NAME

enc_png.c - Functions for dealing with PNG.

SYNOPSIS

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include 'grib2.h'

Typedefs


typedef struct png_stream png_stream
Typedef for PNG stream.

Functions


int enc_png (char *data, g2int width, g2int height, g2int nbits, char *pngbuf)
Encode PNG. void user_flush_data (png_structp png_ptr)
Dummy Custom flush function. 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.

Detailed Description

Functions for dealing with PNG.

Author

Stephen Gilbert

Definition in file enc_png.c.

Typedef Documentation

typedef struct png_stream png_stream

Typedef for PNG stream.

Definition at line 1 of file enc_png.c.

Function Documentation

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

Encode PNG.

Parameters

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

Returns

PNG length, or negative number for error.

Author

Stephen Gilbert

Definition at line 81 of file enc_png.c.

References user_flush_data(), and user_write_data().

Referenced by pngpack().

void user_flush_data (png_structp png_ptr)

Dummy Custom flush function.

Parameters

png_ptr Pointer to PNG struct.

Author

Stephen Gilbert

Definition at line 61 of file enc_png.c.

Referenced by enc_png().

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.

Parameters

png_ptr pointer
data data
length length

Author

Stephen Gilbert

Definition at line 38 of file enc_png.c.

Referenced by enc_png().

Author

Generated automatically by Doxygen for NCEPLIBS-g2c from the source code.

Tue May 3 2022 Version 1.6.4