Adopt UIGraphicsImageRenderer API

Summary:
Apple suggested to this new API on iOS 10+.

> // Any new bitmap drawing code is encouraged to use UIGraphicsImageRenderer in lieu of this API.

WWDC18 Reference: https://developer.apple.com/videos/play/wwdc2018/219/
> Use UIGraphicsImageRenderer to create and draw to an image buffer
Supports Wide Color, unlike UIGraphicsBeginImageContext()
Combine with UIImageView for efficient offscreen rendering

Per https://nshipster.com/image-resizing/#performance-benchmarks, the new API runs even faster than the C version, probably due to more smart context reuses/management.

Changelog:
[iOS][Changed] - Adopt UIGraphicsImageRenderer API

Reviewed By: philIip

Differential Revision: D35699584

fbshipit-source-id: 7a1e2109d5e121fb396c1014f4ed0a892211b0cc

Author: matrush

Libraries/Image/RCTImageBlurUtils.m

@@ -22,10 +22,13 @@
   if (CGImageGetBitsPerPixel(imageRef) != 32 ||
       CGImageGetBitsPerComponent(imageRef) != 8 ||
       !((CGImageGetBitmapInfo(imageRef) & kCGBitmapAlphaInfoMask))) {
-    UIGraphicsBeginImageContextWithOptions(inputImage.size, NO, inputImage.scale);
-    [inputImage drawAtPoint:CGPointZero];
-    imageRef = UIGraphicsGetImageFromCurrentImageContext().CGImage;
-    UIGraphicsEndImageContext();
+    UIGraphicsImageRendererFormat *const rendererFormat = [UIGraphicsImageRendererFormat defaultFormat];
+    rendererFormat.scale = inputImage.scale;
+    UIGraphicsImageRenderer *const renderer = [[UIGraphicsImageRenderer alloc] initWithSize:inputImage.size format:rendererFormat];
+
+    imageRef = [renderer imageWithActions:^(UIGraphicsImageRendererContext *_Nonnull context) {
+      [inputImage drawAtPoint:CGPointZero];
+    }].CGImage;
   }
 
   vImage_Buffer buffer1, buffer2;
@@ -51,7 +54,7 @@
 
   //create temp buffer
   vImage_Error tempBufferSize = vImageBoxConvolve_ARGB8888(&buffer1, &buffer2, NULL, 0, 0, boxSize, boxSize,
-                                                             NULL, kvImageGetTempBufferSize | kvImageEdgeExtend);
+                                                           NULL, kvImageGetTempBufferSize | kvImageEdgeExtend);
   if (tempBufferSize < 0) {
     free(buffer1.data);
     free(buffer2.data);

Libraries/Image/RCTImageUtils.m

@@ -370,13 +370,14 @@ BOOL RCTUpscalingRequired(CGSize sourceSize, CGFloat sourceScale,
   }
 
   BOOL opaque = !RCTImageHasAlpha(image.CGImage);
-  UIGraphicsBeginImageContextWithOptions(destSize, opaque, destScale);
-  CGContextRef currentContext = UIGraphicsGetCurrentContext();
-  CGContextConcatCTM(currentContext, transform);
-  [image drawAtPoint:CGPointZero];
-  UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
-  UIGraphicsEndImageContext();
-  return result;
+  UIGraphicsImageRendererFormat *const rendererFormat = [UIGraphicsImageRendererFormat defaultFormat];
+  rendererFormat.opaque = opaque;
+  rendererFormat.scale = destScale;
+  UIGraphicsImageRenderer *const renderer = [[UIGraphicsImageRenderer alloc] initWithSize:destSize format:rendererFormat];
+  return [renderer imageWithActions:^(UIGraphicsImageRendererContext *_Nonnull context) {
+    CGContextConcatCTM(context.CGContext, transform);
+    [image drawAtPoint:CGPointZero];
+  }];
 }
 
 BOOL RCTImageHasAlpha(CGImageRef image)