Clip interpolators so they can't loop back on themselves (#1471)
Fixes #1457
diff --git a/LottieSample/src/main/assets/Tests/InterpolatorLoopBack.json b/LottieSample/src/main/assets/Tests/InterpolatorLoopBack.json
new file mode 100644
index 0000000..b9e70fc
--- /dev/null
+++ b/LottieSample/src/main/assets/Tests/InterpolatorLoopBack.json
@@ -0,0 +1,1533 @@
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+ },
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+ "nm": "Group 1",
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+ "mn": "ADBE Vector Group",
+ "hd": false
+ }
+ ],
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+ "op": 685,
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+ "bm": 0
+ }
+ ],
+ "markers": [
+ {
+ "tm": 218,
+ "cm": "1",
+ "dr": 0
+ },
+ {
+ "tm": 290,
+ "cm": "",
+ "dr": 0
+ },
+ {
+ "tm": 341,
+ "cm": "2",
+ "dr": 0
+ },
+ {
+ "tm": 404,
+ "cm": "",
+ "dr": 0
+ }
+ ]
+}
\ No newline at end of file
diff --git a/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java b/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java
index 8cd45ba..dada31b 100644
--- a/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java
+++ b/lottie/src/main/java/com/airbnb/lottie/parser/KeyframeParser.java
@@ -137,8 +137,23 @@
interpolator = interpolatorRef.get();
}
if (interpolatorRef == null || interpolator == null) {
- interpolator = PathInterpolatorCompat.create(
- cp1.x / scale, cp1.y / scale, cp2.x / scale, cp2.y / scale);
+ cp1.x /= scale;
+ cp1.y /= scale;
+ cp2.x /= scale;
+ cp2.y /= scale;
+ try {
+ interpolator = PathInterpolatorCompat.create(cp1.x, cp1.y, cp2.x, cp2.y);
+ } catch (IllegalArgumentException e) {
+ if (e.getMessage().equals("The Path cannot loop back on itself.")) {
+ // If a control point extends beyond the previous/next point then it will cause the value of the interpolator to no
+ // longer monotonously increase. This clips the control point bounds to prevent that from happening.
+ // NOTE: this will make the rendered animation behave slightly differently than the original.
+ interpolator = PathInterpolatorCompat.create(Math.min(cp1.x, 1f), cp1.y, Math.max(cp2.x, 0f), cp2.y);
+ } else {
+ // We failed to create the interpolator. Fall back to linear.
+ interpolator = new LinearInterpolator();
+ }
+ }
try {
putInterpolator(hash, new WeakReference<>(interpolator));
} catch (ArrayIndexOutOfBoundsException e) {
