[skottie] Power-reduce paths (cubicTo -> lineTo)

For straight lines, Lottie exports control points conincident with the
vertices.  We can detect this case and emit more efficient lineTo's.

One wrinkle: we can only apply this power-reduction post-interpolation
(otherwise the path verbs and point count would not be guaranteed to
match).  Hence we store explicit shape data and defer the SkPath
conversion.

TBR=

Change-Id: I7818be464eabee6096d2078440843243a55c6e98
Reviewed-on: https://skia-review.googlesource.com/124800
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/experimental/skottie/Skottie.cpp b/experimental/skottie/Skottie.cpp
index bb98ad75f0..1b5886eee0 100644
--- a/experimental/skottie/Skottie.cpp
+++ b/experimental/skottie/Skottie.cpp
@@ -149,7 +149,9 @@ sk_sp<sksg::RenderNode> AttachComposition(const Json::Value&, AttachContext* ctx
 sk_sp<sksg::Path> AttachPath(const Json::Value& jpath, AttachContext* ctx) {
     auto path_node = sksg::Path::Make();
     return BindProperty<ShapeValue>(jpath, &ctx->fAnimators,
-            [path_node](const ShapeValue& p) { path_node->setPath(p); })
+        [path_node](const ShapeValue& p) {
+            path_node->setPath(ValueTraits<ShapeValue>::As<SkPath>(p));
+        })
         ? path_node
         : nullptr;
 }