1 files changed, 110 insertions, 0 deletions
diff --git a/ext/gd/libgd/gd_arc.c b/ext/gd/libgd/gd_arc.c
new file mode 100644
index 000000000..545dcb3fc
--- /dev/null
+++ b/ext/gd/libgd/gd_arc.c
@@ -0,0 +1,110 @@
+#if HAVE_GD_BUNDLED
+# include "gd.h"
+#else
+# include <gd.h>
+#endif
+
+#include "gd_intern.h"
+
+
+/**
+ * Integer Ellipse functions (gdImageEllipse and gdImageFilledEllipse)
+ * Function added by Pierre-Alain Joye 02/08/2003 (paj@pearfr.org)
+ * See the ellipse function simplification for the equation
+ * as well as the midpoint algorithm.
+ */
+
+void gdImageEllipse(gdImagePtr im, int mx, int my, int w, int h, int c)
+{
+	int x=0,mx1=0,mx2=0,my1=0,my2=0;
+	long aq,bq,dx,dy,r,rx,ry,a,b;
+
+	a=w>>1;
+	b=h>>1;
+	gdImageSetPixel(im,mx+a, my, c);
+	gdImageSetPixel(im,mx-a, my, c);
+	mx1 = mx-a;my1 = my;
+	mx2 = mx+a;my2 = my;
+
+	aq = a * a;
+	bq = b * b;
+	dx = aq << 1;
+	dy = bq << 1;
+	r  = a * bq;
+	rx = r << 1;
+	ry = 0;
+	x = a;
+	while (x > 0){
+		if (r > 0) {
+			my1++;my2--;
+			ry +=dx;
+			r  -=ry;
+		}
+		if (r <= 0){
+			x--;
+			mx1++;mx2--;
+			rx -=dy;
+			r  +=rx;
+		}
+		gdImageSetPixel(im,mx1, my1, c);
+		gdImageSetPixel(im,mx1, my2, c);
+		gdImageSetPixel(im,mx2, my1, c);
+		gdImageSetPixel(im,mx2, my2, c);
+	}
+}
+
+void gdImageFilledEllipse (gdImagePtr im, int mx, int my, int w, int h, int c)
+{
+	int x=0,mx1=0,mx2=0,my1=0,my2=0;
+	long aq,bq,dx,dy,r,rx,ry,a,b;
+	int i;
+	int old_y1,old_y2;
+
+	a=w>>1;
+	b=h>>1;
+
+	for (x = mx-a; x <= mx+a; x++) {
+		gdImageSetPixel(im, x, my, c);
+	}
+
+	mx1 = mx-a;my1 = my;
+	mx2 = mx+a;my2 = my;
+
+	aq = a * a;
+	bq = b * b;
+	dx = aq << 1;
+	dy = bq << 1;
+	r  = a * bq;
+	rx = r << 1;
+	ry = 0;
+	x = a;
+	old_y2=-2;
+	old_y1=-2;
+	while (x > 0){
+		if (r > 0) {
+			my1++;my2--;
+			ry +=dx;
+			r  -=ry;
+		}
+		if (r <= 0){
+			x--;
+			mx1++;mx2--;
+			rx -=dy;
+			r  +=rx;
+		}
+		if(old_y2!=my2){
+			for(i=mx1;i<=mx2;i++){
+				gdImageSetPixel(im,i,my1,c);
+			}
+		}
+		if(old_y2!=my2){
+			for(i=mx1;i<=mx2;i++){
+				gdImageSetPixel(im,i,my2,c);
+			}
+		}
+		old_y2 = my2;
+		old_y1 = my1;
+	}
+}
+
+