1 files changed, 59 insertions, 0 deletions
diff --git a/experimental/skotty/SkottyAnimator.cpp b/experimental/skotty/SkottyAnimator.cpp
new file mode 100644
index 0000000000..e08cf35995
--- /dev/null
+++ b/experimental/skotty/SkottyAnimator.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkottyAnimator.h"
+
+namespace skotty {
+
+namespace {
+
+SkScalar lerp_scalar(SkScalar v0, SkScalar v1, float t) {
+    SkASSERT(t >= 0 && t <= 1);
+    return v0 * (1 - t) + v1 * t;
+}
+
+SkPoint lerp_point(const SkPoint& v0, const SkPoint& v1, float t) {
+    SkASSERT(t >= 0 && t <= 1);
+    return SkPoint::Make(lerp_scalar(v0.x(), v1.x(), t),
+                         lerp_scalar(v0.y(), v1.y(), t));
+}
+
+} // namespace
+
+template <>
+void KeyframeInterval<ScalarValue>::lerp(float t, ScalarValue* v) const {
+    *v = lerp_scalar(fV0, fV1, t);
+}
+
+template <>
+void KeyframeInterval<VectorValue>::lerp(float t, VectorValue* v) const {
+    SkASSERT(fV0.cardinality() == fV1.cardinality());
+    SkASSERT(v->cardinality() == 0);
+
+    v->fVals.reserve(fV0.cardinality());
+    for (int i = 0; i < fV0.fVals.count(); ++i) {
+        v->fVals.emplace_back(lerp_scalar(fV0.fVals[i], fV1.fVals[i], t));
+    }
+}
+
+template <>
+void KeyframeInterval<ShapeValue>::lerp(float t, ShapeValue* v) const {
+    SkASSERT(fV0.cardinality() == fV1.cardinality());
+    SkASSERT(v->cardinality() == 0);
+
+    v->fVertices.reserve(fV0.cardinality());
+    for (int i = 0; i < fV0.fVertices.count(); ++i) {
+        v->fVertices.push_back(
+            BezierVertex({
+                lerp_point(fV0.fVertices[i].fInPoint , fV1.fVertices[i].fInPoint , t),
+                lerp_point(fV0.fVertices[i].fOutPoint, fV1.fVertices[i].fOutPoint, t),
+                lerp_point(fV0.fVertices[i].fVertex  , fV1.fVertices[i].fVertex  , t)
+            }));
+    }
+}
+
+} // namespace skotty