add vgerCancelPath

Author: wtholliday

Sources/vger/include/vger.h

@@ -152,6 +152,11 @@ void vgerCubicApproxTo(vgerContext vg, vector_float2 b, vector_float2 c, vector_
 /// Returns false if there were too many primitives to render the fill.
 bool vgerFill(vgerContext, vgerPaintIndex paint);
 
+/// Clear path information.
+///
+/// This is useful for ensuring scripts don't mess up other rendering.
+void vgerCancelPath(vgerContext vg);
+
 #pragma mark - Transforms
 
 /// Translates current coordinate system.

Sources/vger/vger.mm

@@ -887,6 +887,10 @@ bool vgerFill(vgerContext vg, vgerPaintIndex paint) {
     return vg->fill(paint);
 }
 
+void vgerCancelPath(vgerContext vg) {
+    vg->yScanner.segments.clear();
+}
+
 void vgerEncode(vgerContext vg, id<MTLCommandBuffer> buf, MTLRenderPassDescriptor* pass) {
     vg->encode(buf, pass, false);
 }