line.h

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/*=========================================================================

GFX - a small graphics library

Copyright (C) 2004  Rafael de Oliveira Jannone

This library 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.

This library 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 this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Contact the author:
        by e-mail : rafael AT jannone DOT org
        homepage  : http://jannone.org/gfxlib
        ICQ UIN   : 10115284

See the License at http://www.gnu.org/copyleft/lesser.txt

=========================================================================*/

// LINE.H : line drawing functions (header)

/* === WARNING ==

        This is a work-in-progress, meaning that most of this code is unstable
        and it's subject to future changes.  Also, most of it is very hackish,
        not properly cleaned up nor tested.

   === WARNING == */

#ifndef LINE_H
#define LINE_H

#include "gfx.h"

#define DITHER(I, Y)    (dithpat[I][Y & 1])

extern u_char dithpat[5][2];

extern void surface_line(surface_t*, int x1, int y1, int x2, int y2);

extern void line(int x1, int y1, int x2, int y2);

extern void line_slow(int x1, int y1, int x2, int y2);

extern void calculate_side(int x1, int y1, int x2, int y2, int low[], int high[]);

extern void hline(int x1, int y1, int x2, u_char value);

extern void surface_hline(surface_t *s, int x1, int y1, int x2, u_char value);

#endif

---