Optimize hit testing.

ios/Elements/RNSVGGroup.m

@@ -109,25 +109,21 @@
     return (CGPathRef)CFAutorelease(path);
 }
 
-- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event withTransform:(CGAffineTransform)transform
+- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
 {
-    UIView *hitSelf = [super hitTest:point withEvent:event withTransform:transform];
+    CGPoint transformed = CGPointApplyAffineTransform(point, CGAffineTransformInvert(self.matrix));
+
+    UIView *hitSelf = [super hitTest:transformed withEvent:event];
     if (hitSelf) {
         return hitSelf;
     }
 
-    CGAffineTransform matrix = CGAffineTransformConcat(self.matrix, transform);
-
     CGPathRef clip = [self getClipPath];
     if (clip) {
-        CGPathRef transformedClipPath = CGPathCreateCopyByTransformingPath(clip, &matrix);
-        BOOL insideClipPath = CGPathContainsPoint(clip, nil, point, self.clipRule == kRNSVGCGFCRuleEvenodd);
-        CGPathRelease(transformedClipPath);
-
+        BOOL insideClipPath = CGPathContainsPoint(clip, nil, transformed, self.clipRule == kRNSVGCGFCRuleEvenodd);
         if (!insideClipPath) {
             return nil;
         }
-
     }
 
     for (RNSVGNode *node in [self.subviews reverseObjectEnumerator]) {
@@ -141,13 +137,14 @@
             return node;
         }
 
-        UIView *hitChild = [node hitTest: point withEvent:event withTransform:matrix];
+        UIView *hitChild = [node hitTest:transformed withEvent:event];
 
         if (hitChild) {
             node.active = YES;
             return (node.responsible || (node != hitChild)) ? hitChild : self;
         }
     }
+
     return nil;
 }
 

ios/Elements/RNSVGSvgView.m

@@ -17,6 +17,7 @@
     NSMutableDictionary<NSString *, RNSVGNode *> *_templates;
     NSMutableDictionary<NSString *, RNSVGPainter *> *_painters;
     CGAffineTransform _viewBoxTransform;
+    CGAffineTransform _invviewBoxTransform;
 }
 
 - (void)insertReactSubview:(UIView *)subview atIndex:(NSInteger)atIndex
@@ -129,6 +130,7 @@
                                                  eRect:rect
                                                  align:self.align
                                            meetOrSlice:self.meetOrSlice];
+        _invviewBoxTransform = CGAffineTransformInvert(_viewBoxTransform);
         CGContextConcatCTM(context, _viewBoxTransform);
     }
 
@@ -167,6 +169,7 @@
 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
 {
     if (self.align) {
+        CGPoint transformed = CGPointApplyAffineTransform(point, _invviewBoxTransform);
         for (RNSVGNode *node in [self.subviews reverseObjectEnumerator]) {
             if (![node isKindOfClass:[RNSVGNode class]]) {
                 continue;
@@ -178,7 +181,7 @@
                 return node;
             }
 
-            UIView *hitChild = [node hitTest: point withEvent:event withTransform:_viewBoxTransform];
+            UIView *hitChild = [node hitTest:transformed withEvent:event];
 
             if (hitChild) {
                 node.active = YES;