Allow shapes with different point counts but warn (#865)

Previously, Lottie would crash and not even try to render animations with shapes that had a different number of vertices. Now Lottie logs a warnings but renders the first n points where n is the min number of points between the two shapes.

Fixes #856 

4 files changed, 42 insertions, 14 deletions

diff --git a/LottieSample/src/androidTest/java/com/airbnb/lottie/LottieSnapshotProvider.java b/LottieSample/src/androidTest/java/com/airbnb/lottie/LottieSnapshotProvider.java
index 9153f4c5..009b3c1b 100644
--- a/LottieSample/src/androidTest/java/com/airbnb/lottie/LottieSnapshotProvider.java
+++ b/LottieSample/src/androidTest/java/com/airbnb/lottie/LottieSnapshotProvider.java
@@ -7,9 +7,11 @@ import android.graphics.BitmapFactory;
 import android.graphics.Color;
 import android.graphics.ColorFilter;
 import android.graphics.PointF;
+import android.graphics.Rect;
 import android.graphics.drawable.ColorDrawable;
 import android.os.Environment;
 import android.support.annotation.Nullable;
+import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.ViewGroup;
@@ -26,6 +28,7 @@ import com.airbnb.lottie.value.ScaleXY;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
@@ -48,8 +51,7 @@ public class LottieSnapshotProvider extends SnapshotProvider {
 
   LottieSnapshotProvider(Context context) {
     this.context = context;
-    dummyBitmap = BitmapFactory.decodeResource(context.getResources(), com.airbnb.lottie.samples.R
-        .drawable.airbnb);
+    dummyBitmap = BitmapFactory.decodeResource(context.getResources(), com.airbnb.lottie.samples.R.drawable.airbnb);
   }
 
   @Override
@@ -92,6 +94,7 @@ public class LottieSnapshotProvider extends SnapshotProvider {
         continue;
       }
       remainingTasks += 1;
+      Log.d(L.TAG, "Enqueueing " + animation);
       executor.execute(new Runnable() {
         @Override
         public void run() {
@@ -103,19 +106,24 @@ public class LottieSnapshotProvider extends SnapshotProvider {
   }
 
   private void runAnimation(final String name) {
+    Log.d(L.TAG, "Running " + name);
     LottieResult<LottieComposition> result = LottieCompositionFactory.fromAssetSync(context, name);
     if (result.getException() != null) throw new IllegalStateException(result.getException());
     LottieComposition composition = result.getValue();
-    if (composition.getBounds().width() > 4 * Resources.getSystem().getDisplayMetrics().widthPixels ||
-        composition.getBounds().height() > 4 * Resources.getSystem().getDisplayMetrics().heightPixels) {
-      Log.d("Happo", "" + name + " is too large. Skipping (" + composition.getBounds().width() +
-          "x" + composition.getBounds().height() + ")");
+
+    Rect bounds = composition.getBounds();
+    int width = bounds.width();
+    int height = bounds.height();
+    DisplayMetrics displayMetrics = Resources.getSystem().getDisplayMetrics();
+    if (width > 4 * displayMetrics.widthPixels || height > 4 * displayMetrics.heightPixels) {
+      Log.d("Happo", name + " is too large. Skipping (" + width + "x" + height + ")");
       return;
     }
     drawComposition(composition, name);
   }
 
   private void drawComposition(LottieComposition composition, String name) {
+    Log.d(L.TAG, "Drawing " + name);
     LottieAnimationView view = new LottieAnimationView(context);
     view.setImageAssetDelegate(new ImageAssetDelegate() {
       @Override public Bitmap fetchBitmap(LottieImageAsset asset) {
@@ -125,6 +133,7 @@ public class LottieSnapshotProvider extends SnapshotProvider {
     view.setComposition(composition);
     for (float progress : PROGRESS) {
       view.setProgress(progress);
+      Log.d(L.TAG, "Recording " + name + " @ " + progress);
       recordSnapshot(view, 1080, "android", name, Integer.toString((int) (progress * 100)));
     }
   }
diff --git a/LottieSample/src/main/assets/Tests/DifferentPointsCount.json b/LottieSample/src/main/assets/Tests/DifferentPointsCount.json
new file mode 100644
index 00000000..b2afbf36
--- /dev/null
+++ b/LottieSample/src/main/assets/Tests/DifferentPointsCount.json
@@ -0,0 +1 @@
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diff --git a/lottie/src/main/java/com/airbnb/lottie/L.java b/lottie/src/main/java/com/airbnb/lottie/L.java
index f03f5280..79ecf25b 100644
--- a/lottie/src/main/java/com/airbnb/lottie/L.java
+++ b/lottie/src/main/java/com/airbnb/lottie/L.java
@@ -4,11 +4,19 @@ import android.support.annotation.RestrictTo;
 import android.support.v4.os.TraceCompat;
 import android.util.Log;
 
+import java.util.HashSet;
+import java.util.Set;
+
 @RestrictTo(RestrictTo.Scope.LIBRARY)
 public class L {
   public static final String TAG = "LOTTIE";
   public static final boolean DBG = false;
 
+  /**
+   * Set to ensure that we only log each message one time max.
+   */
+  private static final Set<String> loggedMessages = new HashSet<>();
+
   private static final int MAX_DEPTH = 20;
   private static boolean traceEnabled = false;
   private static String[] sections;
@@ -16,8 +24,15 @@ public class L {
   private static int traceDepth = 0;
   private static int depthPastMaxDepth = 0;
 
+  /**
+   * Warn to logcat. Keeps track of messages so they are only logged once ever.
+   */
   public static void warn(String msg) {
+    if (loggedMessages.contains(msg)) {
+      return;
+    }
     Log.w(TAG, msg);
+    loggedMessages.add(msg);
   }
 
   public static void setTraceEnabled(boolean enabled) {
diff --git a/lottie/src/main/java/com/airbnb/lottie/model/content/ShapeData.java b/lottie/src/main/java/com/airbnb/lottie/model/content/ShapeData.java
index 4c9b0b2a..e851c210 100644
--- a/lottie/src/main/java/com/airbnb/lottie/model/content/ShapeData.java
+++ b/lottie/src/main/java/com/airbnb/lottie/model/content/ShapeData.java
@@ -2,7 +2,9 @@ package com.airbnb.lottie.model.content;
 
 import android.graphics.PointF;
 import android.support.annotation.FloatRange;
+import android.util.Log;
 
+import com.airbnb.lottie.L;
 import com.airbnb.lottie.model.CubicCurveData;
 import com.airbnb.lottie.utils.MiscUtils;
 
@@ -49,14 +51,15 @@ public class ShapeData {
     }
     closed = shapeData1.isClosed() || shapeData2.isClosed();
 
-    if (!curves.isEmpty() && curves.size() != shapeData1.getCurves().size()
-        && curves.size() != shapeData2.getCurves().size()) {
-      throw new IllegalStateException("Curves must have the same number of control points. This: "
-          + getCurves().size()
-          + "\tShape 1: " + shapeData1.getCurves().size() + "\tShape 2: "
-          + shapeData2.getCurves().size());
-    } else if (curves.isEmpty()) {
-      for (int i = shapeData1.getCurves().size() - 1; i >= 0; i--) {
+
+    if (shapeData1.getCurves().size() != shapeData2.getCurves().size()) {
+      L.warn("Curves must have the same number of control points. Shape 1: " +
+          shapeData1.getCurves().size() + "\tShape 2: " + shapeData2.getCurves().size());
+    }
+    
+    if (curves.isEmpty()) {
+      int points = Math.min(shapeData1.getCurves().size(), shapeData2.getCurves().size());
+      for (int i = 0; i < points; i++) {
         curves.add(new CubicCurveData());
       }
     }