draw_bitmap.c File Reference

GRASS png display driver - draw bitmap. More...

#include <math.h>
#include "pngdriver.h"

Include dependency graph for pngdriver/draw_bitmap.c:

Go to the source code of this file.

Macros
#define	min(a, b)   ((a) < (b) ? (a) : (b))
#define	max(a, b)   ((a) > (b) ? (a) : (b))

Functions
void	PNG_draw_bitmap (int ncols, int nrows, int threshold, const unsigned char *buf)
	Draw bitmap.

Detailed Description

GRASS png display driver - draw bitmap.

SPDX-FileCopyrightText: 2003-2014 Per Henrik Johansen SPDX-FileCopyrightText: GRASS Development Team SPDX-License-Identifier: GPL-2.0-or-later

Author

Per Henrik Johansen (original contributor)

Glynn Clements

Definition in file pngdriver/draw_bitmap.c.

Macro Definition Documentation

max

#define max	(		a,
			b
	)		((a) > (b) ? (a) : (b))

Definition at line 21 of file pngdriver/draw_bitmap.c.

min

#define min	(		a,
			b
	)		((a) < (b) ? (a) : (b))

Definition at line 18 of file pngdriver/draw_bitmap.c.

Function Documentation

PNG_draw_bitmap()

void PNG_draw_bitmap	(	int	ncols,
		int	nrows,
		int	threshold,
		const unsigned char *	buf
	)

Draw bitmap.

Parameters

ncols,nrows	number of columns and rows
threshold	threshold value
buf	data buffer

Definition at line 31 of file pngdriver/draw_bitmap.c.

References b, cur_x, cur_y, g, max, min, png, png_get_color(), png_get_pixel(), r, and x.

Referenced by PNG_Driver().