#72482, revert for 5.6 for now

Author: pierrejoye

ext/gd/libgd/gd.c

@@ -1301,10 +1301,55 @@ void gdImageAALine (gdImagePtr im, int x1, int y1, int x2, int y2, int col)
 long x, y, inc;
 long dx, dy,tmp;
 
-/* 2.0.10: Nick Atty: clip to edges of drawing rectangle, return if no points need to be drawn */
-if (!clip_1d(&x1,&y1,&x2,&y2,gdImageSX(im)) || !clip_1d(&y1,&x1,&y2,&x2,gdImageSY(im))) {
+if (y1 < 0 && y2 < 0) {
+return;
+}
+if (y1 < 0) {
+x1 += (y1 * (x1 - x2)) / (y2 - y1);
+y1 = 0;
+}
+if (y2 < 0) {
+x2 += (y2 * (x1 - x2)) / (y2 - y1);
+y2 = 0;
+}
+
+/* bottom edge */
+if (y1 >= im->sy && y2 >= im->sy) {
+return;
+}
+if (y1 >= im->sy) {
+x1 -= ((im->sy - y1) * (x1 - x2)) / (y2 - y1);
+y1 = im->sy - 1;
+}
+if (y2 >= im->sy) {
+x2 -= ((im->sy - y2) * (x1 - x2)) / (y2 - y1);
+y2 = im->sy - 1;
+}
+
+/* left edge */
+if (x1 < 0 && x2 < 0) {
 return;
 }
+if (x1 < 0) {
+y1 += (x1 * (y1 - y2)) / (x2 - x1);
+x1 = 0;
+}
+if (x2 < 0) {
+y2 += (x2 * (y1 - y2)) / (x2 - x1);
+x2 = 0;
+}
+/* right edge */
+if (x1 >= im->sx && x2 >= im->sx) {
+return;
+}
+if (x1 >= im->sx) {
+y1 -= ((im->sx - x1) * (y1 - y2)) / (x2 - x1);
+x1 = im->sx - 1;
+}
+if (x2 >= im->sx) {
+y2 -= ((im->sx - x2) * (y1 - y2)) / (x2 - x1);
+x2 = im->sx - 1;
+}
 
 dx = x2 - x1;
 dy = y2 - y1;