libfbx-polygon.c

libfxb是linux下只写操作framebuffer的一个轻量级的库。

/*
 *  libfbx-polygon.c -- Polygon Drawing
 *  (C)opyright 2000-2001 U4X Labs
 *
 *  Written by: Mike Bourgeous <[e-mail]>
 *              Mon Jan 15 17:57:08 MST 2001
 *              
 *  $Id: libfbx-polygon.c,v 1.6 2001/02/04 20:29:56 lethal Exp $
 *
 *	Implementation of a number of polygon drawing routines.
 *
 *  See ChangeLog for modifications, CREDITS for credits.
 *
 *  All source herein is copyright U4X Labs and its original author. 
 *  Any code modifications or additions are (C)opyright the original 
 *  author and U4X Labs respectively.
 *
 *  libfbx is free software; you can redistribute it and/or modify it 
 *  under the terms of the GNU Lesser General Public License as 
 *  published by the Free Software Foundation; either version 2.1 of 
 *  the License, or (at your option) any later version.
 *
 *  libfbx is distributed in the hope that it will be useful, but 
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with libfbx; if not, write to the Free Software 
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <math.h>
#include <libfbx/libfbx.h>
#include <libfbx/libfbx-drivers.h>

/*
 * Function:	fb_fill_rect()
 * Arguments:	top-left corner of rectangle, bottom-left corner of
 * 		rectangle, RGB values of color, surface to draw to.
 * Returns:	None
 * Description:	Draws a filled in rectangle with the specified
 * 		attributes on the specified surface.
 */
void fb_fill_rect(int x1, int y1, 
		  int x2, int y2, 
		  int r, int g, int b, 
		  fb_surface *surface)
{
        int line;

	if (surface->driver != NULL && surface->driver->ops->has_fill_rect) {
		surface->driver->ops->fill_rect(x1, y1, x2, y2, r, g, b, surface);
		return;
	}
	
	for (line = y1; line < y2; line++)
                fb_line(x1, line, x2, line, r, g, b, surface);
}

/*
 * Function:	fb_rect()
 * Arguments:	top-left corner of rectangle, bottom-right corner
 * 		of rectangle, RGB color, surface.
 * Returns:	None
 * Description:	Draws a rectangular outline with the specified
 * 		coordinates.
 */
void fb_rect(int x1, int y1,
	     int x2, int y2,
	     int r, int g, int b,
	     fb_surface *surface)
{
	fb_line(x1, y1, x1, y2, r, g, b, surface);
	fb_line(x1, y2, x2, y2, r, g, b, surface);
	fb_line(x2, y2, x2, y1, r, g, b, surface);
	fb_line(x2, y1, x1, y1, r, g, b, surface);
}