Add generalized Lottie Feature Flags API

lottie/src/main/java/com/airbnb/lottie/LottieAnimationView.java

@@ -403,14 +403,22 @@ public void setUseCompositionFrameRate(boolean useCompositionFrameRate) {
    * instead of using merge paths.
    */
   public void enableMergePathsForKitKatAndAbove(boolean enable) {
-    lottieDrawable.enableMergePathsForKitKatAndAbove(enable);
+    lottieDrawable.enableFeatureFlag(LottieFeatureFlags.FeatureFlag.MergePathsApi19, enable);
   }
 
   /**
    * Returns whether merge paths are enabled for KitKat and above.
    */
   public boolean isMergePathsEnabledForKitKatAndAbove() {
-    return lottieDrawable.isMergePathsEnabledForKitKatAndAbove();
+    return lottieDrawable.isFeatureFlagEnabled(LottieFeatureFlags.FeatureFlag.MergePathsApi19);
+  }
+
+  public void enableFeatureFlag(LottieFeatureFlags.FeatureFlag flag, boolean enable) {
+    lottieDrawable.enableFeatureFlag(flag, enable);
+  }
+
+  public boolean isFeatureFlagEnabled(LottieFeatureFlags.FeatureFlag flag) {
+    return lottieDrawable.isFeatureFlagEnabled(flag);
   }
 
   /**

lottie/src/main/java/com/airbnb/lottie/LottieComposition.java

@@ -26,7 +26,6 @@
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;

lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java

@@ -142,7 +142,7 @@ private enum OnVisibleAction {
   FontAssetDelegate fontAssetDelegate;
   @Nullable
   TextDelegate textDelegate;
-  private boolean enableMergePaths;
+  private final LottieFeatureFlags lottieFeatureFlags = new LottieFeatureFlags();
   private boolean maintainOriginalImageBounds = false;
   private boolean clipToCompositionBounds = true;
   @Nullable
@@ -285,34 +285,39 @@ public boolean hasMatte() {
     return compositionLayer != null && compositionLayer.hasMatte();
   }
 
-  public boolean enableMergePathsForKitKatAndAbove() {
-    return enableMergePaths;
-  }
-
   /**
    * Enable this to get merge path support for devices running KitKat (19) and above.
+   * Deprecated: Use enableFeatureFlag(LottieFeatureFlags.FeatureFlag.MergePathsApi19, enable)
    * <p>
    * Merge paths currently don't work if the the operand shape is entirely contained within the
    * first shape. If you need to cut out one shape from another shape, use an even-odd fill type
    * instead of using merge paths.
    */
+  @Deprecated
   public void enableMergePathsForKitKatAndAbove(boolean enable) {
-    if (enableMergePaths == enable) {
-      return;
+    lottieFeatureFlags.enableFlag(LottieFeatureFlags.FeatureFlag.MergePathsApi19, enable);
+    if (composition != null) {
+      buildCompositionLayer();
     }
+  }
 
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
-      Logger.warning("Merge paths are not supported pre-Kit Kat.");
-      return;
-    }
-    enableMergePaths = enable;
+  /**
+   * Deprecated: Use isFeatureFlagEnabled(LottieFeatureFlags.FeatureFlag.MergePathsApi19)
+   */
+  @Deprecated
+  public boolean isMergePathsEnabledForKitKatAndAbove() {
+    return lottieFeatureFlags.isFlagEnabled(LottieFeatureFlags.FeatureFlag.MergePathsApi19);
+  }
+
+  public void enableFeatureFlag(LottieFeatureFlags.FeatureFlag flag, boolean enable) {
+    lottieFeatureFlags.enableFlag(flag, enable);
     if (composition != null) {
       buildCompositionLayer();
     }
   }
 
-  public boolean isMergePathsEnabledForKitKatAndAbove() {
-    return enableMergePaths;
+  public boolean isFeatureFlagEnabled(LottieFeatureFlags.FeatureFlag flag) {
+    return lottieFeatureFlags.isFlagEnabled(flag);
   }
 
   /**

lottie/src/main/java/com/airbnb/lottie/LottieFeatureFlags.java

@@ -0,0 +1,45 @@
+package com.airbnb.lottie;
+
+import android.annotation.SuppressLint;
+import android.os.Build;
+
+import com.airbnb.lottie.utils.Logger;
+
+import java.util.HashSet;
+
+public class LottieFeatureFlags {
+  public enum FeatureFlag {
+    /**
+     * Merge paths currently don't work if the the operand shape is entirely contained within the
+     * first shape. If you need to cut out one shape from another shape, use an even-odd fill type
+     * instead of using merge paths.
+     */
+    MergePathsApi19(Build.VERSION_CODES.KITKAT);
+
+    public final int minRequiredSdkVersion;
+
+    FeatureFlag(int minRequiredSdkVersion) {
+      this.minRequiredSdkVersion = minRequiredSdkVersion;
+    }
+  }
+
+  private final HashSet<FeatureFlag> enabledFlags = new HashSet<>();
+
+  @SuppressLint("DefaultLocale")
+  public void enableFlag(FeatureFlag flag, boolean enable) {
+    if (enable) {
+      if (Build.VERSION.SDK_INT < flag.minRequiredSdkVersion) {
+        Logger.warning(String.format("%s is not supported pre SDK %d", flag.name(), flag.minRequiredSdkVersion));
+        return;
+      }
+      enabledFlags.add(flag);
+    } else {
+      enabledFlags.remove(flag);
+    }
+  }
+
+  public boolean isFlagEnabled(FeatureFlag flag) {
+    return enabledFlags.contains(flag);
+  }
+
+}

lottie/src/main/java/com/airbnb/lottie/model/content/MergePaths.java

@@ -4,6 +4,7 @@
 
 import com.airbnb.lottie.LottieComposition;
 import com.airbnb.lottie.LottieDrawable;
+import com.airbnb.lottie.LottieFeatureFlags;
 import com.airbnb.lottie.animation.content.Content;
 import com.airbnb.lottie.animation.content.MergePathsContent;
 import com.airbnb.lottie.model.layer.BaseLayer;
@@ -60,7 +61,7 @@ public boolean isHidden() {
   }
 
   @Override @Nullable public Content toContent(LottieDrawable drawable, LottieComposition composition, BaseLayer layer) {
-    if (!drawable.enableMergePathsForKitKatAndAbove()) {
+    if (!drawable.isFeatureFlagEnabled(LottieFeatureFlags.FeatureFlag.MergePathsApi19)) {
       Logger.warning("Animation contains merge paths but they are disabled.");
       return null;
     }