mirror of
https://github.com/reactos/wine.git
synced 2024-12-02 00:36:43 +00:00
a9f55c46c1
to bring wingdi.h almost upto a complete NT4.0 interface. Fix return value of SetRectRgn().
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
|
|
* LineDDA
|
|
*
|
|
* Copyright 1993 Bob Amstadt
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include "wingdi.h"
|
|
#include "wine/wingdi16.h"
|
|
|
|
/**********************************************************************
|
|
* LineDDA16 (GDI.100)
|
|
*/
|
|
void WINAPI LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd, INT16 nYEnd,
|
|
LINEDDAPROC16 callback, LPARAM lParam )
|
|
{
|
|
LineDDA( nXStart, nYStart, nXEnd, nYEnd,
|
|
(LINEDDAPROC)callback, lParam );
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* LineDDA32 (GDI32.248)
|
|
*/
|
|
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;
|
|
}
|