Implemented fast path for same borders/radii

React/Views/RCTBorderDrawing.h

@@ -0,0 +1,61 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import <UIKit/UIKit.h>
+
+typedef struct {
+  CGFloat topLeft;
+  CGFloat topRight;
+  CGFloat bottomLeft;
+  CGFloat bottomRight;
+} RCTCornerRadii;
+
+typedef struct {
+  CGSize topLeft;
+  CGSize topRight;
+  CGSize bottomLeft;
+  CGSize bottomRight;
+} RCTCornerInsets;
+
+typedef struct {
+  CGColorRef top;
+  CGColorRef left;
+  CGColorRef bottom;
+  CGColorRef right;
+} RCTBorderColors;
+
+/**
+ * Determine if the border widths, colors and radii are all equal.
+ */
+BOOL RCTBorderInsetsAreEqual(UIEdgeInsets borderInsets);
+BOOL RCTCornerRadiiAreEqual(RCTCornerRadii cornerRadii);
+BOOL RCTBorderColorsAreEqual(RCTBorderColors borderColors);
+
+/**
+ * Convert RCTCornerRadii to RCTCornerInsets by applying border insets.
+ */
+RCTCornerInsets RCTGetCornerInsets(RCTCornerRadii cornerRadii,
+                                   UIEdgeInsets borderInsets);
+
+/**
+ * Create a CGPath representing a rounded rectangle with the specified bounds
+ * and corner insets. Note that the CGPathRef must be released by the caller.
+ */
+CGPathRef RCTPathCreateWithRoundedRect(CGRect bounds,
+                                       RCTCornerInsets cornerInsets,
+                                       const CGAffineTransform *transform);
+
+/**
+ * Draw a CSS-compliant border as a scalable image.
+ */
+UIImage *RCTGetBorderImage(RCTCornerRadii cornerRadii,
+                           UIEdgeInsets borderInsets,
+                           RCTBorderColors borderColors,
+                           CGColorRef backgroundColor,
+                           BOOL drawToEdge);