4 * Copyright 1993 Bob Amstadt
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "wine/wingdi16.h"
26 /* ### start build ### */
27 extern WORD CALLBACK DDA_CallTo16_word_wwl(LINEDDAPROC16,WORD,WORD,LONG);
28 /* ### stop build ### */
37 static void CALLBACK DDA_callback( INT x, INT y, LPARAM param )
39 const struct linedda16_info *info = (struct linedda16_info *)param;
40 DDA_CallTo16_word_wwl( info->proc, x, y, info->param );
43 /**********************************************************************
46 BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd,
47 LINEDDAPROC callback, LPARAM lParam )
49 INT xadd = 1, yadd = 1;
52 INT dx = nXEnd - nXStart;
53 INT dy = nYEnd - nYStart;
61 if (dx > dy) { /* line is "more horizontal" */
62 err = 2*dy - dx; erradd = 2*dy - 2*dx;
63 for(cnt = 0;cnt <= dx; cnt++) {
64 callback(nXStart,nYStart,lParam);
73 } else { /* line is "more vertical" */
74 err = 2*dx - dy; erradd = 2*dx - 2*dy;
75 for(cnt = 0;cnt <= dy; cnt++) {
76 callback(nXStart,nYStart,lParam);
90 /**********************************************************************
93 void WINAPI LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
94 INT16 nYEnd, LINEDDAPROC16 proc, LPARAM lParam )
96 struct linedda16_info info;
99 LineDDA( nXStart, nYStart, nXEnd, nYEnd, DDA_callback, (LPARAM)&info );