diff --git a/experimental/skotty/Skotty.cpp b/experimental/skotty/Skotty.cpp
new file mode 100644
index 0000000..f9f5741
--- /dev/null
+++ b/experimental/skotty/Skotty.cpp
@@ -0,0 +1,503 @@
+/*
+ * 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 "Skotty.h"
+
+#include "SkCanvas.h"
+#include "SkottyAnimator.h"
+#include "SkottyPriv.h"
+#include "SkottyProperties.h"
+#include "SkData.h"
+#include "SkMakeUnique.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkPoint.h"
+#include "SkSGColor.h"
+#include "SkSGDraw.h"
+#include "SkSGInvalidationController.h"
+#include "SkSGGroup.h"
+#include "SkSGPath.h"
+#include "SkSGTransform.h"
+#include "SkStream.h"
+#include "SkTArray.h"
+#include "SkTHash.h"
+
+#include <cmath>
+#include "stdlib.h"
+
+namespace skotty {
+
+namespace {
+
+using AssetMap = SkTHashMap<SkString, const Json::Value*>;
+
+struct AttachContext {
+    const AssetMap&                          fAssets;
+    SkTArray<std::unique_ptr<AnimatorBase>>& fAnimators;
+};
+
+bool LogFail(const Json::Value& json, const char* msg) {
+    const auto dump = json.toStyledString();
+    LOG("!! %s: %s", msg, dump.c_str());
+    return false;
+}
+
+// This is the workhorse for binding properties: depending on whether the property is animated,
+// it will either apply immediately or instantiate and attach a keyframe animator.
+template <typename ValueT, typename AttrT, typename NodeT, typename ApplyFuncT>
+bool AttachProperty(const Json::Value& jprop, AttachContext* ctx, const sk_sp<NodeT>& node,
+                    ApplyFuncT&& apply) {
+    if (!jprop.isObject())
+        return false;
+
+    if (!ParseBool(jprop["a"], false)) {
+        // Static property.
+        ValueT val;
+        if (!ValueT::Parse(jprop["k"], &val)) {
+            return LogFail(jprop, "Could not parse static property");
+        }
+
+        apply(node, val.template as<AttrT>());
+    } else {
+        // Keyframe property.
+        using AnimatorT = Animator<ValueT, AttrT, NodeT>;
+        auto animator = AnimatorT::Make(jprop["k"], node, std::move(apply));
+
+        if (!animator) {
+            return LogFail(jprop, "Could not instantiate keyframe animator");
+        }
+
+        ctx->fAnimators.push_back(std::move(animator));
+    }
+
+    return true;
+}
+
+sk_sp<sksg::RenderNode> AttachTransform(const Json::Value& t, AttachContext* ctx,
+                                        sk_sp<sksg::RenderNode> wrapped_node) {
+    if (!t.isObject())
+        return wrapped_node;
+
+    auto xform = sk_make_sp<CompositeTransform>(wrapped_node);
+    auto anchor_attached = AttachProperty<VectorValue, SkPoint>(t["a"], ctx, xform,
+            [](const sk_sp<CompositeTransform>& node, const SkPoint& a) {
+                node->setAnchorPoint(a);
+            });
+    auto position_attached = AttachProperty<VectorValue, SkPoint>(t["p"], ctx, xform,
+            [](const sk_sp<CompositeTransform>& node, const SkPoint& p) {
+                node->setPosition(p);
+            });
+    auto scale_attached = AttachProperty<VectorValue, SkVector>(t["s"], ctx, xform,
+            [](const sk_sp<CompositeTransform>& node, const SkVector& s) {
+                node->setScale(s);
+            });
+    auto rotation_attached = AttachProperty<ScalarValue, SkScalar>(t["r"], ctx, xform,
+            [](const sk_sp<CompositeTransform>& node, SkScalar r) {
+                node->setRotation(r);
+            });
+    auto skew_attached = AttachProperty<ScalarValue, SkScalar>(t["sk"], ctx, xform,
+            [](const sk_sp<CompositeTransform>& node, SkScalar sk) {
+                node->setSkew(sk);
+            });
+    auto skewaxis_attached = AttachProperty<ScalarValue, SkScalar>(t["sa"], ctx, xform,
+            [](const sk_sp<CompositeTransform>& node, SkScalar sa) {
+                node->setSkewAxis(sa);
+            });
+
+    if (!anchor_attached &&
+        !position_attached &&
+        !scale_attached &&
+        !rotation_attached &&
+        !skew_attached &&
+        !skewaxis_attached) {
+        LogFail(t, "Could not parse transform");
+        return wrapped_node;
+    }
+
+    return xform->node();
+}
+
+sk_sp<sksg::RenderNode> AttachShape(const Json::Value&, AttachContext* ctx);
+sk_sp<sksg::RenderNode> AttachComposition(const Json::Value&, AttachContext* ctx);
+
+sk_sp<sksg::RenderNode> AttachShapeGroup(const Json::Value& jgroup, AttachContext* ctx) {
+    SkASSERT(jgroup.isObject());
+
+    return AttachShape(jgroup["it"], ctx);
+}
+
+sk_sp<sksg::GeometryNode> AttachPathGeometry(const Json::Value& jpath, AttachContext* ctx) {
+    SkASSERT(jpath.isObject());
+
+    auto path_node = sksg::Path::Make();
+    auto path_attached = AttachProperty<ShapeValue, SkPath>(jpath["ks"], ctx, path_node,
+        [](const sk_sp<sksg::Path>& node, const SkPath& p) { node->setPath(p); });
+
+    if (path_attached)
+        LOG("** Attached path geometry - verbs: %d\n", path_node->getPath().countVerbs());
+
+    return path_attached ? path_node : nullptr;
+}
+
+sk_sp<sksg::Color> AttachColorPaint(const Json::Value& obj, AttachContext* ctx) {
+    SkASSERT(obj.isObject());
+
+    auto color_node = sksg::Color::Make(SK_ColorBLACK);
+    color_node->setAntiAlias(true);
+
+    auto color_attached = AttachProperty<VectorValue, SkColor>(obj["c"], ctx, color_node,
+        [](const sk_sp<sksg::Color>& node, SkColor c) { node->setColor(c); });
+
+    return color_attached ? color_node : nullptr;
+}
+
+sk_sp<sksg::PaintNode> AttachFillPaint(const Json::Value& jfill, AttachContext* ctx) {
+    SkASSERT(jfill.isObject());
+
+    auto color = AttachColorPaint(jfill, ctx);
+    if (color) {
+        LOG("** Attached color fill: 0x%x\n", color->getColor());
+    }
+    return color;
+}
+
+sk_sp<sksg::PaintNode> AttachStrokePaint(const Json::Value& jstroke, AttachContext* ctx) {
+    SkASSERT(jstroke.isObject());
+
+    auto stroke_node = AttachColorPaint(jstroke, ctx);
+    if (!stroke_node)
+        return nullptr;
+
+    LOG("** Attached color stroke: 0x%x\n", stroke_node->getColor());
+
+    stroke_node->setStyle(SkPaint::kStroke_Style);
+
+    auto width_attached = AttachProperty<ScalarValue, SkScalar>(jstroke["w"], ctx, stroke_node,
+        [](const sk_sp<sksg::Color>& node, SkScalar width) { node->setStrokeWidth(width); });
+    if (!width_attached)
+        return nullptr;
+
+    stroke_node->setStrokeMiter(ParseScalar(jstroke["ml"], 4));
+
+    static constexpr SkPaint::Join gJoins[] = {
+        SkPaint::kMiter_Join,
+        SkPaint::kRound_Join,
+        SkPaint::kBevel_Join,
+    };
+    stroke_node->setStrokeJoin(gJoins[SkTPin<int>(ParseInt(jstroke["lj"], 1) - 1,
+                                                  0, SK_ARRAY_COUNT(gJoins) - 1)]);
+
+    static constexpr SkPaint::Cap gCaps[] = {
+        SkPaint::kButt_Cap,
+        SkPaint::kRound_Cap,
+        SkPaint::kSquare_Cap,
+    };
+    stroke_node->setStrokeCap(gCaps[SkTPin<int>(ParseInt(jstroke["lc"], 1) - 1,
+                                                0, SK_ARRAY_COUNT(gCaps) - 1)]);
+
+    return stroke_node;
+}
+
+using GeometryAttacherT = sk_sp<sksg::GeometryNode> (*)(const Json::Value&, AttachContext*);
+static constexpr GeometryAttacherT gGeometryAttachers[] = {
+    AttachPathGeometry,
+};
+
+using PaintAttacherT = sk_sp<sksg::PaintNode> (*)(const Json::Value&, AttachContext*);
+static constexpr PaintAttacherT gPaintAttachers[] = {
+    AttachFillPaint,
+    AttachStrokePaint,
+};
+
+using GroupAttacherT = sk_sp<sksg::RenderNode> (*)(const Json::Value&, AttachContext*);
+static constexpr GroupAttacherT gGroupAttachers[] = {
+    AttachShapeGroup,
+};
+
+enum class ShapeType {
+    kGeometry,
+    kPaint,
+    kGroup,
+};
+
+struct ShapeInfo {
+    const char* fTypeString;
+    ShapeType   fShapeType;
+    uint32_t    fAttacherIndex; // index into respective attacher tables
+};
+
+const ShapeInfo* FindShapeInfo(const Json::Value& shape) {
+    static constexpr ShapeInfo gShapeInfo[] = {
+        { "fl", ShapeType::kPaint   , 0 }, // fill   -> AttachFillPaint
+        { "gr", ShapeType::kGroup   , 0 }, // group  -> AttachShapeGroup
+        { "sh", ShapeType::kGeometry, 0 }, // shape  -> AttachPathGeometry
+        { "st", ShapeType::kPaint   , 1 }, // stroke -> AttachStrokePaint
+    };
+
+    if (!shape.isObject())
+        return nullptr;
+
+    const auto& type = shape["ty"];
+    if (!type.isString())
+        return nullptr;
+
+    const auto* info = bsearch(type.asCString(),
+                               gShapeInfo,
+                               SK_ARRAY_COUNT(gShapeInfo),
+                               sizeof(ShapeInfo),
+                               [](const void* key, const void* info) {
+                                  return strcmp(static_cast<const char*>(key),
+                                                static_cast<const ShapeInfo*>(info)->fTypeString);
+                               });
+
+    return static_cast<const ShapeInfo*>(info);
+}
+
+sk_sp<sksg::RenderNode> AttachShape(const Json::Value& shapeArray, AttachContext* ctx) {
+    if (!shapeArray.isArray())
+        return nullptr;
+
+    sk_sp<sksg::Group> shape_group = sksg::Group::Make();
+
+    SkSTArray<16, sk_sp<sksg::GeometryNode>, true> geos;
+    SkSTArray<16, sk_sp<sksg::PaintNode>   , true> paints;
+
+    for (const auto& s : shapeArray) {
+        const auto* info = FindShapeInfo(s);
+        if (!info) {
+            LogFail(s.isObject() ? s["ty"] : s, "Unknown shape");
+            continue;
+        }
+
+        switch (info->fShapeType) {
+        case ShapeType::kGeometry: {
+            SkASSERT(info->fAttacherIndex < SK_ARRAY_COUNT(gGeometryAttachers));
+            if (auto geo = gGeometryAttachers[info->fAttacherIndex](s, ctx)) {
+                geos.push_back(std::move(geo));
+            }
+        } break;
+        case ShapeType::kPaint: {
+            SkASSERT(info->fAttacherIndex < SK_ARRAY_COUNT(gPaintAttachers));
+            if (auto paint = gPaintAttachers[info->fAttacherIndex](s, ctx)) {
+                paints.push_back(std::move(paint));
+            }
+        } break;
+        case ShapeType::kGroup: {
+            SkASSERT(info->fAttacherIndex < SK_ARRAY_COUNT(gGroupAttachers));
+            if (auto group = gGroupAttachers[info->fAttacherIndex](s, ctx)) {
+                shape_group->addChild(std::move(group));
+            }
+        } break;
+        }
+    }
+
+    for (const auto& geo : geos) {
+        for (int i = paints.count() - 1; i >= 0; --i) {
+            shape_group->addChild(sksg::Draw::Make(geo, paints[i]));
+        }
+    }
+
+    LOG("** Attached shape - geometries: %d, paints: %d\n", geos.count(), paints.count());
+    return shape_group;
+}
+
+sk_sp<sksg::RenderNode> AttachCompLayer(const Json::Value& layer, AttachContext* ctx) {
+    SkASSERT(layer.isObject());
+
+    auto refId = ParseString(layer["refId"], "");
+    if (refId.isEmpty()) {
+        LOG("!! Comp layer missing refId\n");
+        return nullptr;
+    }
+
+    const auto* comp = ctx->fAssets.find(refId);
+    if (!comp) {
+        LOG("!! Pre-comp not found: '%s'\n", refId.c_str());
+        return nullptr;
+    }
+
+    // TODO: cycle detection
+    return AttachComposition(**comp, ctx);
+}
+
+sk_sp<sksg::RenderNode> AttachSolidLayer(const Json::Value& layer, AttachContext*) {
+    SkASSERT(layer.isObject());
+
+    LOG("?? Solid layer stub\n");
+    return nullptr;
+}
+
+sk_sp<sksg::RenderNode> AttachImageLayer(const Json::Value& layer, AttachContext*) {
+    SkASSERT(layer.isObject());
+
+    LOG("?? Image layer stub\n");
+    return nullptr;
+}
+
+sk_sp<sksg::RenderNode> AttachNullLayer(const Json::Value& layer, AttachContext*) {
+    SkASSERT(layer.isObject());
+
+    LOG("?? Null layer stub\n");
+    return nullptr;
+}
+
+sk_sp<sksg::RenderNode> AttachShapeLayer(const Json::Value& layer, AttachContext* ctx) {
+    SkASSERT(layer.isObject());
+
+    LOG("** Attaching shape layer ind: %d\n", ParseInt(layer["ind"], 0));
+
+    return AttachShape(layer["shapes"], ctx);
+}
+
+sk_sp<sksg::RenderNode> AttachTextLayer(const Json::Value& layer, AttachContext*) {
+    SkASSERT(layer.isObject());
+
+    LOG("?? Text layer stub\n");
+    return nullptr;
+}
+
+sk_sp<sksg::RenderNode> AttachLayer(const Json::Value& layer, AttachContext* ctx) {
+    if (!layer.isObject())
+        return nullptr;
+
+    using LayerAttacher = sk_sp<sksg::RenderNode> (*)(const Json::Value&, AttachContext*);
+    static constexpr LayerAttacher gLayerAttachers[] = {
+        AttachCompLayer,  // 'ty': 0
+        AttachSolidLayer, // 'ty': 1
+        AttachImageLayer, // 'ty': 2
+        AttachNullLayer,  // 'ty': 3
+        AttachShapeLayer, // 'ty': 4
+        AttachTextLayer,  // 'ty': 5
+    };
+
+    int type = ParseInt(layer["ty"], -1);
+    if (type < 0 || type >= SkTo<int>(SK_ARRAY_COUNT(gLayerAttachers))) {
+        return nullptr;
+    }
+
+    return AttachTransform(layer["ks"], ctx, gLayerAttachers[type](layer, ctx));
+}
+
+sk_sp<sksg::RenderNode> AttachComposition(const Json::Value& comp, AttachContext* ctx) {
+    if (!comp.isObject())
+        return nullptr;
+
+    LOG("** Attaching composition '%s'\n", ParseString(comp["id"], "").c_str());
+
+    auto comp_group = sksg::Group::Make();
+
+    for (const auto& l : comp["layers"]) {
+        if (auto layer_fragment = AttachLayer(l, ctx)) {
+            comp_group->addChild(std::move(layer_fragment));
+        }
+    }
+
+    return comp_group;
+}
+
+} // namespace
+
+std::unique_ptr<Animation> Animation::Make(SkStream* stream) {
+    if (!stream->hasLength()) {
+        // TODO: handle explicit buffering?
+        LOG("!! cannot parse streaming content\n");
+        return nullptr;
+    }
+
+    Json::Value json;
+    {
+        auto data = SkData::MakeFromStream(stream, stream->getLength());
+        if (!data) {
+            LOG("!! could not read stream\n");
+            return nullptr;
+        }
+
+        Json::Reader reader;
+
+        auto dataStart = static_cast<const char*>(data->data());
+        if (!reader.parse(dataStart, dataStart + data->size(), json, false) || !json.isObject()) {
+            LOG("!! failed to parse json: %s\n", reader.getFormattedErrorMessages().c_str());
+            return nullptr;
+        }
+    }
+
+    const auto version = ParseString(json["v"], "");
+    const auto size    = SkSize::Make(ParseScalar(json["w"], -1), ParseScalar(json["h"], -1));
+    const auto fps     = ParseScalar(json["fr"], -1);
+
+    if (size.isEmpty() || version.isEmpty() || fps < 0) {
+        LOG("!! invalid animation params (version: %s, size: [%f %f], frame rate: %f)",
+            version.c_str(), size.width(), size.height(), fps);
+        return nullptr;
+    }
+
+    return std::unique_ptr<Animation>(new Animation(std::move(version), size, fps, json));
+}
+
+Animation::Animation(SkString version, const SkSize& size, SkScalar fps, const Json::Value& json)
+    : fVersion(std::move(version))
+    , fSize(size)
+    , fFrameRate(fps)
+    , fInPoint(ParseScalar(json["ip"], 0))
+    , fOutPoint(SkTMax(ParseScalar(json["op"], SK_ScalarMax), fInPoint)) {
+
+    AssetMap assets;
+    for (const auto& asset : json["assets"]) {
+        if (!asset.isObject()) {
+            continue;
+        }
+
+        assets.set(ParseString(asset["id"], ""), &asset);
+    }
+
+    AttachContext ctx = { assets, fAnimators };
+    fDom = AttachComposition(json, &ctx);
+
+    LOG("** Attached %d animators\n", fAnimators.count());
+}
+
+Animation::~Animation() = default;
+
+void Animation::render(SkCanvas* canvas) const {
+    if (!fDom)
+        return;
+
+    sksg::InvalidationController ic;
+    fDom->revalidate(&ic, SkMatrix::I());
+
+    // TODO: proper inval
+    fDom->render(canvas);
+
+    if (!fShowInval)
+        return;
+
+    SkPaint fill, stroke;
+    fill.setAntiAlias(true);
+    fill.setColor(0x40ff0000);
+    stroke.setAntiAlias(true);
+    stroke.setColor(0xffff0000);
+    stroke.setStyle(SkPaint::kStroke_Style);
+
+    for (const auto& r : ic) {
+        canvas->drawRect(r, fill);
+        canvas->drawRect(r, stroke);
+    }
+}
+
+void Animation::animationTick(SkMSec ms) {
+    // 't' in the BM model really means 'frame #'
+    auto t = static_cast<float>(ms) * fFrameRate / 1000;
+
+    t = fInPoint + std::fmod(t, fOutPoint - fInPoint);
+
+    // TODO: this can be optimized quite a bit with some sorting/state tracking.
+    for (const auto& a : fAnimators) {
+        a->tick(t);
+    }
+}
+
+} // namespace skotty