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Initial Lottie loader impl (Skotty)

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Coarse workflow:

* Construction

  1) build a Json tree
  2) collect asset IDs (for preComp/image layer resolution)
  3) "attach" pass
     - traverse the Json tree
     - build an SkSG dom, one fragment at a time
     - attach "animator" objects to the dom, for each animated prop
  4) done, we can throw away the Json tree

* For each animation tick

  1) iterate over active animators and poke their respective dom nodes/attributes
  2) revalidate the SkSG dom
  3) draw the SkSG dom

Note: post construction, things are super-simple - we just poke SkSG DOM attributes
with interpolated values, and everything else is handled by SkSG (invalidation,
revalidation, render).

Change-Id: I96a02be7eb4fb4cb3831f59bf2b3908ea190c0dd
Reviewed-on: https://skia-review.googlesource.com/89420
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
This commit is contained in:
Florin Malita 2017-12-30 12:27:00 -05:00 committed by Skia Commit-Bot
parent 83b2b08afc
commit 094ccde238
13 changed files with 1385 additions and 0 deletions
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17
BUILD.gn
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@ -1320,6 +1320,21 @@ if (skia_enable_tools) {
]
}
test_lib("experimental_skotty") {
public_include_dirs = [ "experimental/skotty" ]
include_dirs = [ "tools" ]
sources = [
"experimental/skotty/Skotty.cpp",
"experimental/skotty/SkottyAnimator.cpp",
"experimental/skotty/SkottyProperties.cpp",
]
deps = [
":experimental_sksg",
":skia",
"//third_party/jsoncpp",
]
}
test_lib("experimental_svg_model") {
public_include_dirs = [ "experimental/svg/model" ]
sources = [
@ -1877,6 +1892,7 @@ if (skia_enable_tools) {
"tools/viewer/ImageSlide.cpp",
"tools/viewer/SKPSlide.cpp",
"tools/viewer/SampleSlide.cpp",
"tools/viewer/SkottySlide.cpp",
"tools/viewer/StatsLayer.cpp",
"tools/viewer/Viewer.cpp",
]
@ -1884,6 +1900,7 @@ if (skia_enable_tools) {
include_dirs = []
deps = [
":experimental_skotty",
":flags",
":gm",
":gpu_tool_utils",

503
experimental/skotty/Skotty.cpp Normal file
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@ -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

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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef Skotty_DEFINED
#define Skotty_DEFINED
#include "SkRefCnt.h"
#include "SkSize.h"
#include "SkString.h"
#include "SkTArray.h"
#include "SkTHash.h"
#include "SkTypes.h"
#include <memory>
class SkCanvas;
class SkStream;
namespace Json { class Value; }
namespace sksg { class RenderNode; }
namespace skotty {
class AnimatorBase;
class Animation : public SkNoncopyable {
public:
static std::unique_ptr<Animation> Make(SkStream*);
~Animation();
void render(SkCanvas*) const;
void animationTick(SkMSec);
const SkString& version() const { return fVersion; }
const SkSize& size() const { return fSize; }
SkScalar frameRate() const { return fFrameRate; }
void setShowInval(bool show) { fShowInval = show; }
private:
Animation(SkString ver, const SkSize& size, SkScalar fps, const Json::Value&);
SkString fVersion;
SkSize fSize;
SkScalar fFrameRate,
fInPoint,
fOutPoint;
sk_sp<sksg::RenderNode> fDom;
SkTArray<std::unique_ptr<AnimatorBase>> fAnimators;
bool fShowInval = false;
typedef SkNoncopyable INHERITED;
};
} // namespace skotty
#endif // Skotty_DEFINED

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/*
* 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

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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkottyAnimator_DEFINED
#define SkottyAnimator_DEFINED
#include "SkottyPriv.h"
#include "SkottyProperties.h"
#include "SkTArray.h"
#include "SkTypes.h"
#include <functional>
#include <memory>
namespace skotty {
class AnimatorBase : public SkNoncopyable {
public:
virtual ~AnimatorBase() = default;
virtual void tick(SkMSec) = 0;
protected:
AnimatorBase() = default;
};
// Describes a keyframe interpolation interval (v0@t0) -> (v1@t1).
// TODO: add interpolation params.
template <typename T>
struct KeyframeInterval {
T fV0,
fV1;
float fT0 = 0,
fT1 = 0;
void lerp(float t, T*) const;
};
// Binds an animated/keyframed property to a node attribute.
template <typename ValT, typename AttrT, typename NodeT>
class Animator : public AnimatorBase {
public:
static std::unique_ptr<Animator> Make(const Json::Value& frames, sk_sp<NodeT> node,
std::function<void(const sk_sp<NodeT>&, const AttrT&)> applyFunc);
void tick(SkMSec t) override {
const auto& frame = this->findInterval(t);
const auto rel_t = (t - frame.fT0) / (frame.fT1 - frame.fT0);
ValT val;
frame.lerp(SkTPin<float>(rel_t, 0, 1), &val);
fFunc(fTarget, val.template as<AttrT>());
}
private:
Animator(SkTArray<KeyframeInterval<ValT>>&& intervals, sk_sp<NodeT> node,
std::function<void(const sk_sp<NodeT>&, const AttrT&)> applyFunc)
: fIntervals(std::move(intervals))
, fTarget(std::move(node))
, fFunc(std::move(applyFunc)) {}
const KeyframeInterval<ValT>& findInterval(float t) const;
const SkTArray<KeyframeInterval<ValT>> fIntervals;
sk_sp<NodeT> fTarget;
std::function<void(const sk_sp<NodeT>&, const AttrT&)> fFunc;
};
template <typename ValT, typename AttrT, typename NodeT>
std::unique_ptr<Animator<ValT, AttrT, NodeT>>
Animator<ValT, AttrT, NodeT>::Make(const Json::Value& frames,
sk_sp<NodeT> node, std::function<void(const sk_sp<NodeT>&, const AttrT&)> applyFunc) {
if (!frames.isArray())
return nullptr;
SkTArray<KeyframeInterval<ValT>> intervals;
for (const auto& frame : frames) {
if (!frame.isObject())
return nullptr;
const auto t = ParseScalar(frame["t"], SK_ScalarMin);
if (t == SK_ScalarMin)
break;
auto* prev_interval = intervals.empty() ? nullptr : &intervals.back();
if (prev_interval) {
if (prev_interval->fT0 >= t) {
LOG("!! Ignoring out-of-order key frame (t: %f < t: %f)\n", t, prev_interval->fT0);
continue;
}
// Back-fill the prev interval t1.
prev_interval->fT1 = t;
}
auto& curr_interval = intervals.push_back();
if (!ValT::Parse(frame["s"], &curr_interval.fV0) ||
!ValT::Parse(frame["e"], &curr_interval.fV1) ||
curr_interval.fV0.cardinality() != curr_interval.fV1.cardinality() ||
(prev_interval &&
curr_interval.fV0.cardinality() != prev_interval->fV0.cardinality())) {
// Invalid frame, or "t"-only frame.
intervals.pop_back();
continue;
}
curr_interval.fT0 = curr_interval.fT1 = t;
}
// If we couldn't determine a t1 for the last interval, discard it.
if (!intervals.empty() && intervals.back().fT0 == intervals.back().fT1) {
intervals.pop_back();
}
if (intervals.empty()) {
return nullptr;
}
return std::unique_ptr<Animator>(
new Animator(std::move(intervals), node, std::move(applyFunc)));
}
template <typename ValT, typename AttrT, typename NodeT>
const KeyframeInterval<ValT>& Animator<ValT, AttrT, NodeT>::findInterval(float t) const {
SkASSERT(!fIntervals.empty());
// TODO: cache last/current frame?
auto f0 = fIntervals.begin(),
f1 = fIntervals.end() - 1;
SkASSERT(f0->fT0 < f0->fT1);
SkASSERT(f1->fT0 < f1->fT1);
if (t < f0->fT0) {
return *f0;
}
if (t > f1->fT1) {
return *f1;
}
while (f0 != f1) {
SkASSERT(f0 < f1);
SkASSERT(t >= f0->fT0 && t <= f1->fT1);
const auto f = f0 + (f1 - f0) / 2;
SkASSERT(f->fT0 < f->fT1);
if (t > f->fT1) {
f0 = f + 1;
} else {
f1 = f;
}
}
SkASSERT(f0 == f1);
SkASSERT(t >= f0->fT0 && t <= f1->fT1);
return *f0;
}
} // namespace skotty
#endif // SkottyAnimator_DEFINED

41
experimental/skotty/SkottyPriv.h Normal file
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@ -0,0 +1,41 @@
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkottyPriv_DEFINED
#define SkottyPriv_DEFINED
#include "SkJSONCPP.h"
#include "SkScalar.h"
#include "SkString.h"
namespace skotty {
#define LOG SkDebugf
static inline SkScalar ParseScalar(const Json::Value& v, SkScalar defaultValue) {
return !v.isNull() && v.isConvertibleTo(Json::realValue)
? v.asFloat() : defaultValue;
}
static inline SkString ParseString(const Json::Value& v, const char defaultValue[]) {
return SkString(!v.isNull() && v.isConvertibleTo(Json::stringValue)
? v.asCString() : defaultValue);
}
static inline int ParseInt(const Json::Value& v, int defaultValue) {
return !v.isNull() && v.isConvertibleTo(Json::intValue)
? v.asInt() : defaultValue;
}
static inline bool ParseBool(const Json::Value& v, bool defaultValue) {
return !v.isNull() && v.isConvertibleTo(Json::booleanValue)
? v.asBool() : defaultValue;
}
} // namespace
#endif // SkottyPriv_DEFINED

157
experimental/skotty/SkottyProperties.cpp Normal file
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@ -0,0 +1,157 @@
/*
* 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 "SkottyProperties.h"
#include "SkColor.h"
#include "SkottyPriv.h"
#include "SkPath.h"
#include "SkSGTransform.h"
namespace skotty {
namespace {
using PointArray = SkSTArray<64, SkPoint, true>;
bool ParsePoints(const Json::Value& v, PointArray* pts) {
if (!v.isArray()) {
return false;
}
for (Json::ArrayIndex i = 0; i < v.size(); ++i) {
const auto& pt = v[i];
if (!pt.isArray() || pt.size() != 2 ||
!pt[0].isConvertibleTo(Json::realValue) ||
!pt[1].isConvertibleTo(Json::realValue)) {
return false;
}
pts->push_back(SkPoint::Make(ParseScalar(pt[0], 0), ParseScalar(pt[1], 0)));
}
return true;
}
} // namespace
bool ScalarValue::Parse(const Json::Value& v, ScalarValue* scalar) {
if (v.isNull() || !v.isConvertibleTo(Json::realValue))
return false;
scalar->fVal = ParseScalar(v, 0);
return true;
}
bool VectorValue::Parse(const Json::Value& v, VectorValue* vec) {
SkASSERT(vec->fVals.empty());
if (!v.isArray())
return false;
for (Json::ArrayIndex i = 0; i < v.size(); ++i) {
const auto& el = v[i];
if (el.isNull() || !el.isConvertibleTo(Json::realValue))
return false;
vec->fVals.emplace_back(ParseScalar(el, 0));
}
return true;
}
bool ShapeValue::Parse(const Json::Value& v, ShapeValue* shape) {
PointArray inPts,
outPts,
verts;
// Some files appear to wrap these in arrays for no reason.
if (v.isArray()) {
return Parse(v[0], shape);
}
if (!v.isObject() ||
!ParsePoints(v["i"], &inPts) ||
!ParsePoints(v["o"], &outPts) ||
!ParsePoints(v["v"], &verts) ||
inPts.count() != outPts.count() ||
inPts.count() != verts.count()) {
return false;
}
SkASSERT(shape->fVertices.empty());
for (int i = 0; i < inPts.count(); ++i) {
shape->fVertices.emplace_back(BezierVertex({inPts[i], outPts[i], verts[i]}));
}
shape->fClose = ParseBool(v["c"], false);
return true;
}
template <>
SkColor VectorValue::as<SkColor>() const {
// best effort to turn this into a color
const auto r = fVals.count() > 0 ? fVals[0].as<SkScalar>() : 0,
g = fVals.count() > 1 ? fVals[1].as<SkScalar>() : 0,
b = fVals.count() > 2 ? fVals[2].as<SkScalar>() : 0,
a = fVals.count() > 3 ? fVals[3].as<SkScalar>() : 1;
return SkColorSetARGB(SkTPin<SkScalar>(a, 0, 1) * 255,
SkTPin<SkScalar>(r, 0, 1) * 255,
SkTPin<SkScalar>(g, 0, 1) * 255,
SkTPin<SkScalar>(b, 0, 1) * 255);
}
template <>
SkPoint VectorValue::as<SkPoint>() const {
// best effort to turn this into a point
const auto x = fVals.count() > 0 ? fVals[0].as<SkScalar>() : 0,
y = fVals.count() > 1 ? fVals[1].as<SkScalar>() : 0;
return SkPoint::Make(x, y);
}
template <>
SkPath ShapeValue::as<SkPath>() const {
SkPath path;
if (!fVertices.empty()) {
path.moveTo(fVertices.front().fVertex);
}
const auto& addCubic = [](const BezierVertex& from, const BezierVertex& to, SkPath* path) {
path->cubicTo(from.fVertex + from.fOutPoint,
to.fVertex + to.fInPoint,
to.fVertex);
};
for (int i = 1; i < fVertices.count(); ++i) {
addCubic(fVertices[i - 1], fVertices[i], &path);
}
if (fClose) {
addCubic(fVertices.back(), fVertices.front(), &path);
}
return path;
}
CompositeTransform::CompositeTransform(sk_sp<sksg::RenderNode> wrapped_node)
: fTransformNode(sksg::Transform::Make(std::move(wrapped_node), SkMatrix::I())) {}
void CompositeTransform::apply() {
SkMatrix t = SkMatrix::MakeTrans(-fAnchorPoint.x(), -fAnchorPoint.y());
t.postScale(fScale.x() / 100, fScale.y() / 100); // 100% based
t.postRotate(fRotation);
t.postTranslate(fPosition.x(), fPosition.y());
// TODO: skew
fTransformNode->setMatrix(t);
}
} // namespace skotty

128
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@ -0,0 +1,128 @@
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkottyProperties_DEFINED
#define SkottyProperties_DEFINED
#include "SkPoint.h"
#include "SkSize.h"
#include "SkottyPriv.h"
#include "SkRefCnt.h"
#include "SkTArray.h"
#include "SkTypes.h"
#include <memory>
class SkPath;
namespace sksg {
class RenderNode;
class Transform;
}
namespace skotty {
struct BezierVertex {
SkPoint fInPoint, // "in" control point, relative to the vertex
fOutPoint, // "out" control point, relative to the vertex
fVertex;
};
struct ScalarValue {
float fVal;
static bool Parse(const Json::Value&, ScalarValue*);
ScalarValue() : fVal(0) {}
explicit ScalarValue(SkScalar v) : fVal(v) {}
ScalarValue& operator=(SkScalar v) { fVal = v; return *this; }
operator SkScalar() const { return fVal; }
size_t cardinality() const { return 1; }
template <typename T>
T as() const;
};
template <>
inline SkScalar ScalarValue::as<SkScalar>() const {
return fVal;
}
struct VectorValue {
SkTArray<ScalarValue, true> fVals;
static bool Parse(const Json::Value&, VectorValue*);
VectorValue() = default;
VectorValue(const VectorValue&) = delete;
VectorValue(VectorValue&&) = default;
VectorValue& operator==(const VectorValue&) = delete;
size_t cardinality() const { return SkTo<size_t>(fVals.count()); }
template <typename T>
T as() const;
};
struct ShapeValue {
SkTArray<BezierVertex, true> fVertices;
bool fClose = false;
ShapeValue() = default;
ShapeValue(const ShapeValue&) = delete;
ShapeValue(ShapeValue&&) = default;
ShapeValue& operator==(const ShapeValue&) = delete;
static bool Parse(const Json::Value&, ShapeValue*);
size_t cardinality() const { return SkTo<size_t>(fVertices.count()); }
template <typename T>
T as() const;
};
// Composite properties.
#define COMPOSITE_PROPERTY(p_name, p_type, p_default) \
void set##p_name(const p_type& p) { \
if (p == f##p_name) return; \
f##p_name = p; \
this->apply(); \
} \
private: \
p_type f##p_name = p_default; \
public:
class CompositeTransform final : public SkRefCnt {
public:
explicit CompositeTransform(sk_sp<sksg::RenderNode>);
const sk_sp<sksg::Transform>& node() const { return fTransformNode; }
COMPOSITE_PROPERTY(AnchorPoint, SkPoint , SkPoint::Make(0, 0))
COMPOSITE_PROPERTY(Position , SkPoint , SkPoint::Make(0, 0))
COMPOSITE_PROPERTY(Scale , SkVector, SkPoint::Make(100, 100))
COMPOSITE_PROPERTY(Rotation , SkScalar, 0)
COMPOSITE_PROPERTY(Skew , SkScalar, 0)
COMPOSITE_PROPERTY(SkewAxis , SkScalar, 0)
private:
void apply();
sk_sp<sksg::Transform> fTransformNode;
using INHERITED = SkRefCnt;
};
#undef COMPOSITE_PROPERTY
} // namespace skotty
#endif // SkottyProperties_DEFINED

112
resources/skotty/skotty_sample_1.json Normal file
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@ -0,0 +1,112 @@
{
"v":"4.6.9",
"fr":60,
"ip":0,
"op":200,
"w":800,
"h":600,
"nm":"Loader 1 JSON",
"ddd":0,
"layers":[
{
"ddd":0,
"ind":1,
"ty":4,
"nm":"Custom Path 1",
"ao": 0,
"ip": 0,
"op": 300,
"st": 0,
"sr": 1,
"bm": 0,
"ks": {
"o": { "a":0, "k":100 },
"r": { "a":0, "k":0 },
"p": { "a":0, "k":[ 0, 0, 0 ] },
"a": { "a":0, "k":[ 0, 0, 0 ] },
"s": { "a":0, "k":[ 100, 100, 100 ] }
},
"shapes":[
{
"ty":"gr",
"it":[
{
"ty" : "sh",
"nm" : "Path 1",
"ks" : {
"a" : 1,
"k" : [
{
"s": [ {
"i": [ [ -50, 0 ], [ -50, 0 ], [ -50, 0 ], [ -50, 0 ] ],
"o": [ [ 50, 0 ], [ 50, 0 ], [ 50, 0 ], [ 50, 0 ] ],
"v": [ [ 0, 100 ], [ 100, 0 ], [ 300, 200 ], [ 400, 100 ] ],
"c": false
} ],
"e": [ {
"i": [ [ -50, 0 ], [ -50, 0 ], [ -50, 0 ], [ -50, 0 ] ],
"o": [ [ 50, 0 ], [ 50, 0 ], [ 50, 0 ], [ 50, 0 ] ],
"v": [ [ 0, 100 ], [ 100, 200 ], [ 300, 0 ], [ 400, 100 ] ],
"c": false
} ],
"i": { "x":0.5, "y":0.5 },
"o": { "x":0.5, "y":0.5 },
"t": 0
},
{
"s": [ {
"i": [ [ -50, 0 ], [ -50, 0 ], [ -50, 0 ], [ -50, 0 ] ],
"o": [ [ 50, 0 ], [ 50, 0 ], [ 50, 0 ], [ 50, 0 ] ],
"v": [ [ 0, 100 ], [ 100, 200 ], [ 300, 0 ], [ 400, 100 ] ],
"c": false
} ],
"e": [ {
"i": [ [ -50, 0 ], [ -50, 0 ], [ -50, 0 ], [ -50, 0 ] ],
"o": [ [ 50, 0 ], [ 50, 0 ], [ 50, 0 ], [ 50, 0 ] ],
"v": [ [ 0, 100 ], [ 100, 0 ], [ 300, 200 ], [ 400, 100 ] ],
"c": false
} ],
"i": { "x":0.5, "y":0.5 },
"o": { "x":0.5, "y":0.5 },
"t": 100
},
{
"t": 200
}
]
}
},
{
"ty": "st",
"nm": "Stroke 1",
"lc": 1,
"lj": 1,
"ml": 4,
"w" : { "a": 0, "k": 30 },
"o" : { "a": 0, "k": 100 },
"c" : { "a": 1, "k": [
{ "s": [ 1, 0, 0 ], "e": [ 0, 1, 0 ], "i": { "x":0.5, "y":0.5 }, "o": { "x":0.5, "y":0.5 }, "t": 0 },
{ "s": [ 0, 1, 0 ], "e": [ 1, 0, 0 ], "i": { "x":0.5, "y":0.5 }, "o": { "x":0.5, "y":0.5 }, "t": 100 },
{ "t": 200 }
] }
},
{
"ty":"tr",
"p" : { "a":0, "k":[ 0, 0 ] },
"a" : { "a":0, "k":[ 0, 0 ] },
"s" : { "a":0, "k":[ 100, 100 ] },
"r" : { "a":0, "k": 0 },
"o" : { "a":0, "k":100 },
"nm": "Transform"
}
]
}
]
}
]
}

3
tools/flags/SkCommandLineFlags.h
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@ -155,6 +155,9 @@ public:
fStrings[i].set(str);
}
const SkString* begin() const { return fStrings.begin(); }
const SkString* end() const { return fStrings.end(); }
private:
void reset() { fStrings.reset(); }

75
tools/viewer/SkottySlide.cpp Normal file
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@ -0,0 +1,75 @@
/*
* 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 "SkottySlide.h"
#include "SkAnimTimer.h"
#include "Skotty.h"
#include "SkStream.h"
SkottySlide::SkottySlide(const SkString& name, const SkString& path)
: fPath(path) {
fName = name;
}
void SkottySlide::load(SkScalar, SkScalar) {
auto stream = SkStream::MakeFromFile(fPath.c_str());
fAnimation = skotty::Animation::Make(stream.get());
fTimeBase = 0; // force a time reset
if (fAnimation) {
SkDebugf("loaded Bodymovin animation v: %s, size: [%f %f], fr: %f\n",
fAnimation->version().c_str(),
fAnimation->size().width(),
fAnimation->size().height(),
fAnimation->frameRate());
} else {
SkDebugf("failed to load Bodymovin animation: %s\n", fPath.c_str());
}
}
void SkottySlide::unload() {
fAnimation.reset();
}
SkISize SkottySlide::getDimensions() const {
return fAnimation? fAnimation->size().toCeil() : SkISize::Make(0, 0);
}
void SkottySlide::draw(SkCanvas* canvas) {
if (fAnimation) {
fAnimation->render(canvas);
}
}
bool SkottySlide::animate(const SkAnimTimer& timer) {
if (fTimeBase == 0) {
// Reset the animation time.
fTimeBase = timer.msec();
}
if (fAnimation) {
auto t = timer.msec() - fTimeBase;
fAnimation->animationTick(t);
}
return true;
}
bool SkottySlide::onChar(SkUnichar c) {
switch (c) {
case 'I':
if (fAnimation) {
fShowAnimationInval = !fShowAnimationInval;
fAnimation->setShowInval(fShowAnimationInval);
}
break;
default:
break;
}
return INHERITED::onChar(c);
}

39
tools/viewer/SkottySlide.h Normal file
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@ -0,0 +1,39 @@
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkottySlide_DEFINED
#define SkottySlide_DEFINED
#include "Slide.h"
namespace skotty { class Animation; }
class SkottySlide : public Slide {
public:
SkottySlide(const SkString& name, const SkString& path);
~SkottySlide() override = default;
void load(SkScalar winWidth, SkScalar winHeight) override;
void unload() override;
SkISize getDimensions() const override;
void draw(SkCanvas*) override;
bool animate(const SkAnimTimer&) override;
bool onChar(SkUnichar) override;
private:
SkString fPath;
std::unique_ptr<skotty::Animation> fAnimation;
SkMSec fTimeBase = 0;
bool fShowAnimationInval = false;
typedef Slide INHERITED;
};
#endif // SkottySlide_DEFINED

16
tools/viewer/Viewer.cpp
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@ -11,6 +11,7 @@
#include "ImageSlide.h"
#include "Resources.h"
#include "SampleSlide.h"
#include "SkottySlide.h"
#include "SKPSlide.h"
#include "GrContext.h"
@ -68,9 +69,11 @@ static DEFINE_bool(list, false, "List samples?");
#ifdef SK_BUILD_FOR_ANDROID
static DEFINE_string(skps, "/data/local/tmp/skps", "Directory to read skps from.");
static DEFINE_string(jpgs, "/data/local/tmp/resources", "Directory to read jpgs from.");
static DEFINE_string(jsons, "/data/local/tmp/jsons", "Directory to read (Bodymovin) jsons from.");
#else
static DEFINE_string(skps, "skps", "Directory to read skps from.");
static DEFINE_string(jpgs, "jpgs", "Directory to read jpgs from.");
static DEFINE_string(jsons, "jsons", "Directory to read (Bodymovin) jsons from.");
#endif
static DEFINE_string2(backend, b, "sw", "Backend to use. Allowed values are " BACKENDS_STR ".");
@ -480,6 +483,19 @@ void Viewer::initSlides() {
}
}
}
// JSONs
for (const auto& json : FLAGS_jsons) {
SkOSFile::Iter it(json.c_str(), ".json");
SkString jsonName;
while (it.next(&jsonName)) {
if (SkCommandLineFlags::ShouldSkip(FLAGS_match, jsonName.c_str())) {
continue;
}
fSlides.push_back(sk_make_sp<SkottySlide>(jsonName, SkOSPath::Join(json.c_str(),
jsonName.c_str())));
}
}
}