From 4c15691768ebd19e613c484f08b604acdb0fbc7c Mon Sep 17 00:00:00 2001
From: Yury Popov <github@phoenix.dj>
Date: Thu, 14 May 2015 20:13:37 +0300
Subject: [PATCH] Clip-paths support

---
 pxSVG/pxSVGObject.h     |  1 +
 pxSVG/pxSVGObject.m     |  5 +++++
 pxSVG/pxSVGRenderPath.m | 25 +++++++++++++++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/pxSVG/pxSVGObject.h b/pxSVG/pxSVGObject.h
index 587e353..fdd36f1 100644
--- a/pxSVG/pxSVGObject.h
+++ b/pxSVG/pxSVGObject.h
@@ -17,6 +17,7 @@
 @property NSArray *animations;
 @property UIColor *fillColor;
 @property NSString *fillDef;
+@property NSString *clipDef;
 @property UIColor *strokeColor;
 @property CGFloat strokeWidth;
 @property CGFloat opacity;
diff --git a/pxSVG/pxSVGObject.m b/pxSVG/pxSVGObject.m
index 68f5930..3ce2a14 100644
--- a/pxSVG/pxSVGObject.m
+++ b/pxSVG/pxSVGObject.m
@@ -108,6 +108,11 @@ - (void)loadAttributes:(NSDictionary *)attributes
         u = [[u substringWithRange:NSMakeRange(3, u.length-4)] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"\n\r\t ()#"]];
         self.fillDef = u;
     } else self.fillColor = [self.class colorWithSVGColor:[ma objectForKey:@"fill"]];
+    if ([ma objectForKey:@"clip-path"]) {
+        NSString *u = [[ma objectForKey:@"clip-path"] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+        u = [[u substringWithRange:NSMakeRange(3, u.length-4)] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"\n\r\t ()#"]];
+        self.clipDef = u;
+    }
     self.strokeColor = [self.class colorWithSVGColor:[ma objectForKey:@"stroke"]];
     self.strokeWidth = [ma objectForKey:@"stroke-width"]?[[ma objectForKey:@"stroke-width"] doubleValue]:NAN;
     self.transform = [self.class transformFromString:[ma objectForKey:@"transform"]];
diff --git a/pxSVG/pxSVGRenderPath.m b/pxSVG/pxSVGRenderPath.m
index 01338f3..f32f447 100644
--- a/pxSVG/pxSVGRenderPath.m
+++ b/pxSVG/pxSVGRenderPath.m
@@ -183,6 +183,7 @@ - (pxSVGObject*)reuseObjectWithAttributes:(NSDictionary*)attributes
     obj.fillOpacity = oobj.fillOpacity;
     obj.fillColor = oobj.fillColor;
     obj.fillDef = oobj.fillDef;
+    obj.clipDef = oobj.clipDef;
     if ([attributes objectForKey:@"fill"]) {
         CGFloat a = obj.fillOpacity;
         if ([[attributes objectForKey:@"fill"] hasPrefix:@"url("]) {
@@ -286,6 +287,7 @@ - (pxSVGPattern*)parsePattern:(pxXMLNode*)node
         p.fillOpacity = op.fillOpacity;
         p.fillColor = op.fillColor;
         p.fillDef = op.fillDef;
+        p.clipDef = op.clipDef;
         p.strokeColor = op.strokeColor;
         p.strokeWidth = op.strokeWidth;
         p.subnodes = op.subnodes;
@@ -389,6 +391,7 @@ - (pxSVGObject*)parseObject:(pxXMLNode*)node inheritAttributes:(pxSVGObject*)inh
         obj.strokeColor = inherit?inherit.strokeColor:nil;
     if (obj.id) [self.defCache setObject:obj forKey:obj.id];
     if (obj.fillDef) [self findDef:obj.fillDef];
+    if (obj.clipDef) [self findDef:obj.clipDef];
     if (node.childNodes.count) {
         NSMutableArray *subnodes = [NSMutableArray new];
         for (pxXMLNode *n in node.childNodes) {
@@ -401,6 +404,19 @@ - (pxSVGObject*)parseObject:(pxXMLNode*)node inheritAttributes:(pxSVGObject*)inh
     }
     return obj;
 }
+- (UIBezierPath*)mergePath:(pxSVGObject*)node
+{
+    UIBezierPath *bp = [UIBezierPath new];
+    if ([node respondsToSelector:@selector(d)]) {
+        [bp appendPath:[(id)node d]];
+    }
+    if ([node respondsToSelector:@selector(subnodes)]) {
+        for (pxSVGObject *o in [(id)node subnodes]) {
+            [bp appendPath:[self mergePath:o]];
+        }
+    }
+    return bp;
+}
 - (CALayer *)makeLayerWithNode:(pxSVGObject*)node rootBounds:(CGRect)bounds;
 {
     CALayer *l;
@@ -446,6 +462,15 @@ - (CALayer *)makeLayerWithNode:(pxSVGObject*)node rootBounds:(CGRect)bounds;
     } else {
         l = [CALayer new];
     }
+    if (node.clipDef) {
+        id def = [self findDef:node.clipDef];
+        if ([def isKindOfClass:[pxSVGObject class]]) {
+            CAShapeLayer *ml = [CAShapeLayer new];
+            ml.frame = (CGRect){CGPointZero,bounds.size};
+            ml.path = [self mergePath:def].CGPath;
+            l.mask = ml;
+        }
+    }
     l.frame = (CGRect){{-bounds.origin.x,-bounds.origin.y},bounds.size};
     CATransform3D tr = node.transform;
     tr = CATransform3DConcat(CATransform3DMakeTranslation( bounds.size.width/2,  bounds.size.height/2, 0), tr);