PNG image support functions. More...

#include <config.h>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_RGB_Image.H>
#include <FL/fl_string_functions.h>
#include <FL/fl_utf8.h>
#include <stdio.h>
#include <time.h>

Functions
int	fl_write_png (const char filename, const char pixels, int w, int h, int d, int ld)
	Write raw image data to a PNG image file.

int	fl_write_png (const char filename, const unsigned char pixels, int w, int h, int d, int ld)
	Write raw image data to a PNG image file.

int	fl_write_png (const char filename, Fl_RGB_Image img)
	Write an RGB(A) image to a PNG image file.

Detailed Description

PNG image support functions.

Function Documentation

◆ fl_write_png() [1/3]

int fl_write_png	(	const char *	filename,
		const char *	pixels,
		int	w,
		int	h,
		int	d,
		int	ld
	)

Write raw image data to a PNG image file.

This is a very basic and restricted function to create a PNG image file from raw image data, e.g. a screenshot.

The image data must be aligned w/o gaps after each row (ld = 0 or ld = w * d) or ld must be the total length of each row, i.e. w * d + gapsize. If ld == 0 then ld = w * d is assumed.

The total data size must be (w * d + gapsize) * h = ld' * h where ld' = w * d if ld == 0.

For further restrictions and return values please see fl_write_png(const char *filename, Fl_RGB_Image *img).

Parameters

[in]	filename	Output filename, extension should be '.png'
[in]	pixels	Image data
[in]	w	Image data width
[in]	h	Image data height
[in]	d	Image depth: 1 = GRAY, 2 = GRAY + alpha, 3 = RGB, 4 = RGBA
[in]	ld	Line delta: default (0) = w * d

Returns: success (0) or error code, see ...

See also: fl_write_png(const char *filename, Fl_RGB_Image *img)

◆ fl_write_png() [2/3]

int fl_write_png	(	const char *	filename,
		const unsigned char *	pixels,
		int	w,
		int	h,
		int	d,
		int	ld
	)

Write raw image data to a PNG image file.

See also: fl_write_png(const char *filename, const char *pixels, int w, int h, int d, int ld)

◆ fl_write_png() [3/3]

int fl_write_png	(	const char *	filename,
		Fl_RGB_Image *	img
	)

Write an RGB(A) image to a PNG image file.

This is a very basic and restricted function to create a PNG image file from an RGB image (Fl_RGB_Image).

The image data must be aligned w/o gaps, i.e. ld() MUST be zero or equal to data_w() * data_h().

The image file is always written with the original image size data_w() and data_h(), even if the image has been scaled.

Image depth 1 (gray), 2 (gray + alpha channel), 3 (RGB) and 4 (RGBA) are supported.

Note: Currently there is no error handling except for errors when opening the file. This may be changed in the future.