RCTImageUtils Obj-C nullability annotations

Summary:
Add Objective-C nullability annotations to RCTImageUtils

public

Reviewed By: nicklockwood

Differential Revision: D2797310

fb-gh-sync-id: 08329f70d1a09bf47865c9e7e76d7b4340eb6e80

Libraries/Image/RCTImageUtils.h

@@ -12,6 +12,8 @@
 
 #import "RCTDefines.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 /**
  * This function takes an input content size (typically from an image), a target
  * size and scale that it will be drawn at (typically in a CGContext) and then
@@ -53,16 +55,16 @@ RCT_EXTERN CGSize RCTSizeInPixels(CGSize pointSize, CGFloat scale);
  * width/height of the returned image is guaranteed to be >= destSize.
  * Pass a destSize of CGSizeZero to decode the image at its original size.
  */
-RCT_EXTERN UIImage *RCTDecodeImageWithData(NSData *data,
-                                           CGSize destSize,
-                                           CGFloat destScale,
-                                           UIViewContentMode resizeMode);
+RCT_EXTERN UIImage *__nullable RCTDecodeImageWithData(NSData *data,
+                                                      CGSize destSize,
+                                                      CGFloat destScale,
+                                                      UIViewContentMode resizeMode);
 
 /**
  * This function takes the source data for an image and decodes just the
  * metadata, without decompressing the image itself.
  */
-RCT_EXTERN NSDictionary<NSString *, id> *RCTGetImageMetadata(NSData *data);
+RCT_EXTERN NSDictionary<NSString *, id> *__nullable RCTGetImageMetadata(NSData *data);
 
 /**
  * Convert an image back into data. Images with an alpha channel will be
@@ -71,4 +73,6 @@ RCT_EXTERN NSDictionary<NSString *, id> *RCTGetImageMetadata(NSData *data);
  * conversion, with 1.0 being maximum quality. It has no effect for images
  * using PNG compression.
  */
-RCT_EXTERN NSData *RCTGetImageData(CGImageRef image, float quality);
+RCT_EXTERN NSData *__nullable RCTGetImageData(CGImageRef image, float quality);
+
+NS_ASSUME_NONNULL_END

Libraries/Image/RCTImageUtils.m

@@ -207,10 +207,10 @@ CGSize RCTSizeInPixels(CGSize pointSize, CGFloat scale)
   };
 }
 
-UIImage *RCTDecodeImageWithData(NSData *data,
-                                CGSize destSize,
-                                CGFloat destScale,
-                                UIViewContentMode resizeMode)
+UIImage *__nullable RCTDecodeImageWithData(NSData *data,
+                                           CGSize destSize,
+                                           CGFloat destScale,
+                                           UIViewContentMode resizeMode)
 {
   CGImageSourceRef sourceRef = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
   if (!sourceRef) {
@@ -265,7 +265,7 @@ UIImage *RCTDecodeImageWithData(NSData *data,
   return image;
 }
 
-NSDictionary<NSString *, id> *RCTGetImageMetadata(NSData *data)
+NSDictionary<NSString *, id> *__nullable RCTGetImageMetadata(NSData *data)
 {
   CGImageSourceRef sourceRef = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
   if (!sourceRef) {
@@ -276,7 +276,7 @@ NSDictionary<NSString *, id> *RCTGetImageMetadata(NSData *data)
   return (__bridge_transfer id)imageProperties;
 }
 
-NSData *RCTGetImageData(CGImageRef image, float quality)
+NSData *__nullable RCTGetImageData(CGImageRef image, float quality)
 {
   NSDictionary *properties;
   CGImageDestinationRef destination;