libfbx-gui.c

libfxb是linux下只写操作framebuffer的一个轻量级的库。

/*
 *  libfbx-gui.c -- gui routines for libfbx
 *  (C)opyright 2000-2001 U4X Labs
 *
 *  Written by: Paul Mundt <[e-mail]>
 *  		Michael Bourgeous <[e-mail]>
 *              Mon Dec 11 14:51:49 EST 2000
 *
 *  $Id: libfbx-gui.c,v 1.16 2001/01/25 01:48:32 nitroglycerine Exp $
 *
 *  	This is the place for all the gui specific routines
 *  for the libfbx system go.
 *
 *  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 <libfbx/libfbx.h>
#include <libfbx/libfbx-gui.h>

/*
 * Function:    fb_draw_textbox()
 * Arguments:   Beginning x, y coords, ending x, y coords.
 *              Foreground rgb values, background rgb values,
 *              surface to draw on.         
 * Returns:     None.
 * Description: Draws a text box from x1, y1 to x2, y2 with
 *              specified rgb values for both foreground and
 *              background on specified surface.
 */
void fb_draw_textbox(int x1, int y1, int x2, int y2, 
                     int r1, int g1, int b1, 
                     int r2, int g2, int b2, 
                     fb_surface *surface)
{
	fb_fill_rect(x1 + 1, y1 + 1, x2 - 1, y2 - 1, r1, g1, b1, surface);
	fb_line(x1, y1, x2, y1, r2, g2, b2, surface);
	fb_line(x2, y1, x2, y2, r2, g2, b2, surface);
	fb_line(x2, y2, x1, y2, r2, g2, b2, surface);
	fb_line(x1, y2, x1, y1, r2, g2, b2, surface);
}

/*
 * Function:    fb_draw_box()
 * Arguments:   Beginning x, y coords, ending x, y corrds.
 *              RGB values, surface to draw on.
 * Returns:     None.
 * Description: Draws a box from x1, y1 to x2, y2 with
 *              specified rgb values on specified surface.
 *              (Same as fb_fill_rect()).
 */
void fb_draw_box(int x1, int y1, int x2, int y2,
                 int r, int g, int b,
                 fb_surface *surface)
{
	fb_fill_rect(x1, y1, x2, y2, r, g, b, surface);
}

/*
 * Function:    fb_dotted_rect()
 * Arguments:   Beginning x, y coords, ending x, y corrds.
 *              RGB values, surface to draw on.
 * Returns:     None.
 * Description: Draws a dotted rectangle outline from
 * 		x1, y1 to x2, y2 with specified rgb 
 * 		values on specified surface.
 */
void fb_dotted_rect(int x1, int y1, int x2, int y2,
		    int fg_r, int fg_g, int fg_b,
		    int bg_r, int bg_g, int bg_b,
		    fb_surface *surface)
{
	int x = ((x1 + y1) & 1) ? 1 : 0;
	int c;

	for(c = x1; c <= x2; c++)
	{
		fb_putpixel(c, y1,
			    (((c + y1) & 1) == x) ? fg_r : bg_r,
			    (((c + y1) & 1) == x) ? fg_g : bg_g,
			    (((c + y1) & 1) == x) ? fg_b : bg_b,
			    surface);
		fb_putpixel(c, y2,
			    (((c+y2) & 1) == x) ? fg_r : bg_r, 
			    (((c+y2) & 1) == x) ? fg_g : bg_g, 
			    (((c+y2) & 1) == x) ? fg_b : bg_b,
			    surface);
	}
	
	for (c = y1 + 1; c < y2; c++) 
	{
		fb_putpixel(x1, c, 
			    (((c+x1) & 1) == x) ? fg_r : bg_r,
			    (((c+x1) & 1) == x) ? fg_g : bg_g,
			    (((c+x1) & 1) == x) ? fg_b : bg_b,
			    surface);
		fb_putpixel(x2, c, 
			    (((c+x1) & 1) == x) ? fg_r : bg_r,
			    (((c+x1) & 1) == x) ? fg_g : bg_g,
			    (((c+x1) & 1) == x) ? fg_b : bg_b,
			    surface);
	}
}

/*
 * Function:    fb_gui_strlen()
 * Arguments:   string
 * Returns:     Length of string in pixels.
 * Description: Calculates the length of the string in pixels,
 * 		ignoring the & character.
 */
int fb_gui_strlen(char *string)
{
	int len = 0;
	int i = 0;
	int u = FALSE;

	while(string[i])
	{
		if(string[i] == '&')
		{
			if(!u)
			{
				i++;
				u = TRUE;
				continue;
			}
			len += fb_screen->font.width;
			u = FALSE;
			i++;
			continue;
		}

		if(u)
			u = FALSE;

		len += fb_screen->font.width;
		i++;
	}
	
	return len;
}

/*
 * Function:    fb_gui_puts()
 * Arguments:   coordinates, center flag, surface, string, color of underline
 * Returns:     Length of printed string in pixels.
 * Description: Uses fb_sputc() to draw text on the screen,
 * 		but interprets the & character as a directive to
 * 		underline the next character drawn.  If the center
 * 		flag is set, text will be horizontally centered 
 * 		around the coordinates given.  Tab and newline are 
 * 		untreated.
 */
int fb_gui_puts(int x, int y, int center, int r, int g, int b, fb_surface *surface, char *string)
{
	int pix = 0;
	int u = FALSE;
	int i = 0;

	if(center)
		x -= fb_gui_strlen(string) / 2;

	while(string[i])
	{
		if(string[i] == '&')
		{
			if(!u)
			{
				i++;
				u = TRUE;
				continue;
			}
			if(surface)
				fb_sputc(x, y, string[i++], surface);
			x += surface->font.width;
			pix += surface->font.width;
			u = FALSE;
			continue;
		}
		
		if(u)
		{
			if(surface)
				fb_line(x, y + surface->font.height,
					x + surface->font.width,
					y + surface->font.height,
					r, g, b,
					surface); 
			u = FALSE;
		}
		
		if(surface)
			fb_sputc(x, y, string[i++], surface);

		x += surface->font.width;
		pix += surface->font.width;
	}

	return pix;
}