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diff --git a/third_party/agg23/agg_math_stroke.h b/third_party/agg23/agg_math_stroke.h
index 6d7ba8a..2b06b1b 100644
--- a/third_party/agg23/agg_math_stroke.h
+++ b/third_party/agg23/agg_math_stroke.h
@@ -60,28 +60,30 @@ void stroke_calc_arc(VertexConsumer& out_vertices,
}
da = acos(width / (width + ((1.0f / 8) / approximation_scale))) * 2;
out_vertices.add(coord_type(x + dx1, y + dy1));
- if(!ccw) {
- if(a1 > a2) {
- a2 += 2 * FX_PI;
+ if (da > 0) {
+ if (!ccw) {
+ if (a1 > a2) {
+ a2 += 2 * FX_PI;
}
a2 -= da / 4;
a1 += da;
- while(a1 < a2) {
+ while (a1 < a2) {
out_vertices.add(coord_type(x + (width * cos(a1)),
y + (width * sin(a1))));
- a1 += da;
+ a1 += da;
}
- } else {
- if(a1 < a2) {
- a2 -= 2 * FX_PI;
+ } else {
+ if (a1 < a2) {
+ a2 -= 2 * FX_PI;
}
a2 += da / 4;
a1 -= da;
- while(a1 > a2) {
+ while (a1 > a2) {
out_vertices.add(coord_type(x + (width * cos(a1)),
y + (width * sin(a1))));
- a1 -= da;
+ a1 -= da;
}
+ }
}
out_vertices.add(coord_type(x + dx2, y + dy2));
}
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