fix(🌈): enable wide gamut colors by default on iOS (#3153)

Author: wcandillon

packages/skia/apple/MetalWindowContext.mm

@@ -23,6 +23,15 @@
   _layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
   _layer.contentsGravity = kCAGravityBottomLeft;
   _layer.drawableSize = CGSizeMake(width, height);
+  BOOL supportsWideColor = NO;
+  if (@available(iOS 10.0, *)) {
+    supportsWideColor = [UIScreen mainScreen].traitCollection.displayGamut == UIDisplayGamutP3;
+  }
+  if (supportsWideColor) {
+    CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceDisplayP3);
+    _layer.colorspace = colorSpace;
+    CGColorSpaceRelease(colorSpace);
+  }
 }
 
 sk_sp<SkSurface> MetalWindowContext::getSurface() {
@@ -61,4 +70,4 @@
   [commandBuffer presentDrawable:_currentDrawable];
   [commandBuffer commit];
   _skSurface = nullptr;
-}
+}