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- ensure that x1<x2 or y1<y2

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This commit is contained in:
Pierre Joye 2005-12-30 09:53:05 +00:00
parent 974ed3825f
commit e45ec1e460
1 changed files with 13 additions and 0 deletions
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13
ext/gd/libgd/gd.c
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@ -1019,6 +1019,7 @@ void gdImageAABlend (gdImagePtr im)
/* Bresenham as presented in Foley & Van Dam */
void gdImageLine (gdImagePtr im, int x1, int y1, int x2, int y2, int color)
{
int t;
int dx, dy, incr1, incr2, d, x, y, xend, yend, xdirflag, ydirflag;
int wid;
int w, wstart;
@ -1031,6 +1032,12 @@ void gdImageLine (gdImagePtr im, int x1, int y1, int x2, int y2, int color)
/* Vertical */
if (x1==x2) {
if (y2 < y1) {
t = y2;
y2 = y1;
y1 = t;
}
for (;y1 <= y2; y1++) {
gdImageSetPixel(im, x1,y1, color);
}
@ -1039,6 +1046,12 @@ void gdImageLine (gdImagePtr im, int x1, int y1, int x2, int y2, int color)
/* Horizontal */
if (y1==y2) {
if (x2 < x1) {
t = x2;
x2 = x1;
x1 = t;
}
for (;x1 <= x2; x1++) {
gdImageSetPixel(im, x1,y1, color);
}