[react-native] Open-source ReactART for native

Libraries/ART/ARTTextFrame.h

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+/**
+ * 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 <CoreText/CoreText.h>
+
+// A little helper to make sure we have a set of lines including width ready for use.
+// We assume that we will only this in one place so no reference counting is necessary.
+// Needs to be freed when dealloced.
+
+// This is fragile since this relies on these values not getting reused. Consider
+// wrapping these in an Obj-C class or some ARC hackery to get refcounting.
+
+typedef struct {
+  size_t count;
+  CGFloat baseLine; // Distance from the origin to the base line of the first line
+  CGFloat lineHeight; // Distance between lines
+  CTLineRef *lines;
+  CGFloat *widths; // Width of each line
+} ARTTextFrame;