- MFH: optimize horizontal and vertical lines

1 files changed, 26 insertions, 0 deletions

diff --git a/ext/gd/libgd/gd.c b/ext/gd/libgd/gd.c
index bd6c984614..1d8de43615 100644
--- a/ext/gd/libgd/gd.c
+++ b/ext/gd/libgd/gd.c
@@ -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;
@@ -1029,6 +1030,31 @@ void gdImageLine (gdImagePtr im, int x1, int y1, int x2, int y2, int color)
 		return;
 	}
 
+	/* Vertical */
+	if (x1==x2) {
+		if (y2 < y1) {
+			t = y2;
+			y2 = y1;
+			y1 = t;
+		}
+
+		for (;y1 <= y2; y1++) {
+			gdImageSetPixel(im, x1,y1, color);
+		}
+		return;
+	} else if (y1==y2) { 	/* Horizontal */
+		if (x2 < x1) {
+			t = x2;
+			x2 = x1;
+			x1 = t;
+		}
+
+		for (;x1 <= x2; x1++) {
+			gdImageSetPixel(im, x1,y1, color);
+		}
+		return;
+	}
+
 	/* gdAntiAliased passed as color: set anti-aliased line (AAL) global vars. */
 	if (color == gdAntiAliased) {
 		im->AAL_x1 = x1;