mirror of
https://github.com/reactos/wine.git
synced 2024-11-26 13:10:28 +00:00
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*
|
|
* LineDDA
|
|
*
|
|
* Copyright 1993 Bob Amstadt
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include "windef.h"
|
|
#include "wingdi.h"
|
|
#include "wine/wingdi16.h"
|
|
|
|
/* ### start build ### */
|
|
extern WORD CALLBACK DDA_CallTo16_word_wwl(LINEDDAPROC16,WORD,WORD,LONG);
|
|
/* ### stop build ### */
|
|
|
|
struct linedda16_info
|
|
{
|
|
LINEDDAPROC16 proc;
|
|
LPARAM param;
|
|
};
|
|
|
|
|
|
static void CALLBACK DDA_callback( INT x, INT y, LPARAM param )
|
|
{
|
|
const struct linedda16_info *info = (struct linedda16_info *)param;
|
|
DDA_CallTo16_word_wwl( info->proc, x, y, info->param );
|
|
}
|
|
|
|
/**********************************************************************
|
|
* LineDDA (GDI32.@)
|
|
*/
|
|
BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd,
|
|
LINEDDAPROC callback, LPARAM lParam )
|
|
{
|
|
INT xadd = 1, yadd = 1;
|
|
INT err,erradd;
|
|
INT cnt;
|
|
INT dx = nXEnd - nXStart;
|
|
INT dy = nYEnd - nYStart;
|
|
|
|
if (dx < 0) {
|
|
dx = -dx; xadd = -1;
|
|
}
|
|
if (dy < 0) {
|
|
dy = -dy; yadd = -1;
|
|
}
|
|
if (dx > dy) { /* line is "more horizontal" */
|
|
err = 2*dy - dx; erradd = 2*dy - 2*dx;
|
|
for(cnt = 0;cnt <= dx; cnt++) {
|
|
callback(nXStart,nYStart,lParam);
|
|
if (err > 0) {
|
|
nYStart += yadd;
|
|
err += erradd;
|
|
} else {
|
|
err += 2*dy;
|
|
}
|
|
nXStart += xadd;
|
|
}
|
|
} else { /* line is "more vertical" */
|
|
err = 2*dx - dy; erradd = 2*dx - 2*dy;
|
|
for(cnt = 0;cnt <= dy; cnt++) {
|
|
callback(nXStart,nYStart,lParam);
|
|
if (err > 0) {
|
|
nXStart += xadd;
|
|
err += erradd;
|
|
} else {
|
|
err += 2*dx;
|
|
}
|
|
nYStart += yadd;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* LineDDA (GDI.100)
|
|
*/
|
|
void WINAPI LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
|
|
INT16 nYEnd, LINEDDAPROC16 proc, LPARAM lParam )
|
|
{
|
|
struct linedda16_info info;
|
|
info.proc = proc;
|
|
info.param = lParam;
|
|
LineDDA( nXStart, nYStart, nXEnd, nYEnd, DDA_callback, (LPARAM)&info );
|
|
}
|