Support customizing contentsScale of text layer

Sources/Private/CoreAnimation/Layers/TextLayer.swift

@@ -58,6 +58,14 @@ final class TextLayer: BaseCompositionLayer {
       renderLayer.text = sourceText.text
     }
 
+    // Apply the custom contents scale for this layer if it was provided
+    if
+      let contentsScaleProvider = context.textProvider as? TextContentsScaleProvider,
+      let contentsScale = contentsScaleProvider.contentsScale(for: textAnimationContext.currentKeypath)
+    {
+      renderLayer.contentsScale = contentsScale
+    }
+
     renderLayer.sizeToFit()
   }
 

Sources/Public/TextProvider/AnimationTextProvider.swift

@@ -5,6 +5,8 @@
 //  Created by Alexandr Goncharov on 07/06/2019.
 //
 
+import Foundation
+
 // MARK: - AnimationKeypathTextProvider
 
 /// Protocol for providing dynamic text to for a Lottie animation.
@@ -45,6 +47,15 @@ extension LegacyAnimationTextProvider {
   }
 }
 
+// MARK: - TextContentScaleProvider
+
+/// `AnimationKeypathTextProvider` that can additionally customize the content scale of the rendered text
+public protocol TextContentsScaleProvider: AnimationKeypathTextProvider {
+  /// The `contentsScale` value to use when rendering text for the given layer keypath.
+  /// Customizing the `contentsScale` can help reduce aliasing caused by text resizing.
+  func contentsScale(for keypath: AnimationKeypath) -> CGFloat?
+}
+
 // MARK: - DictionaryTextProvider
 
 /// Text provider that simply map values from dictionary.

Tests/SnapshotConfiguration.swift

@@ -11,10 +11,11 @@ import UIKit
 struct SnapshotConfiguration {
   /// The precision that should be used when comparing the
   /// captured snapshot with the reference image in `Tests/__Snapshots`
-  ///  - Defaults to 1.0 (the snapshot must match exactly).
   ///  - This can be lowered for snapshots that render somewhat nondeterministically,
   ///    but should be kept as high as possible (while still permitting the diff to succeed)
-  var precision: Float = 1
+  /// - Defaults to 0.985 to reduce the number of flaky snapshots due to small differences
+  ///    in rendering based on OS version.
+  var precision: Float = 0.985
 
   /// Dynamic value providers that should be applied to the animation
   var customValueProviders: [AnimationKeypath: AnyValueProvider] = [:]

Tests/__Snapshots__/AutomaticEngineTests/testAutomaticEngineDetection.Issues-pr_2559.txt

@@ -0,0 +1 @@
+Supports Core Animation engine