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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 "SkottyProperties.h"
#include "SkColor.h"
#include "SkottyPriv.h"
#include "SkPath.h"
#include "SkSGPath.h"
#include "SkSGRect.h"
#include "SkSGTransform.h"
#include <cmath>
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
template <>
bool ValueTraits<ScalarValue>::Parse(const Json::Value& v, ScalarValue* scalar) {
// Some files appear to wrap keyframes in arrays for no reason.
if (v.isArray() && v.size() == 1) {
return Parse(v[0], scalar);
}
if (v.isNull() || !v.isConvertibleTo(Json::realValue))
return false;
*scalar = v.asFloat();
return true;
}
template <>
size_t ValueTraits<ScalarValue>::Cardinality(const ScalarValue&) {
return 1;
}
template <>
template <>
SkScalar ValueTraits<ScalarValue>::As<SkScalar>(const ScalarValue& v) {
return v;
}
template <>
bool ValueTraits<VectorValue>::Parse(const Json::Value& v, VectorValue* vec) {
SkASSERT(vec->empty());
if (!v.isArray())
return false;
for (Json::ArrayIndex i = 0; i < v.size(); ++i) {
ScalarValue scalar;
if (!ValueTraits<ScalarValue>::Parse(v[i], &scalar))
return false;
vec->push_back(std::move(scalar));
}
return true;
}
template <>
size_t ValueTraits<VectorValue>::Cardinality(const VectorValue& vec) {
return vec.size();
}
template <>
template <>
SkColor ValueTraits<VectorValue>::As<SkColor>(const VectorValue& vec) {
// best effort to turn this into a color
const auto r = vec.size() > 0 ? vec[0] : 0,
g = vec.size() > 1 ? vec[1] : 0,
b = vec.size() > 2 ? vec[2] : 0,
a = vec.size() > 3 ? vec[3] : 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 <>
template <>
SkPoint ValueTraits<VectorValue>::As<SkPoint>(const VectorValue& vec) {
// best effort to turn this into a point
const auto x = vec.size() > 0 ? vec[0] : 0,
y = vec.size() > 1 ? vec[1] : 0;
return SkPoint::Make(x, y);
}
template <>
template <>
SkSize ValueTraits<VectorValue>::As<SkSize>(const VectorValue& vec) {
const auto pt = ValueTraits::As<SkPoint>(vec);
return SkSize::Make(pt.x(), pt.y());
}
template<>
bool ValueTraits<ShapeValue>::Parse(const Json::Value& v, ShapeValue* shape) {
PointArray inPts, // Cubic Bezier "in" control points, relative to vertices.
outPts, // Cubic Bezier "out" control points, relative to vertices.
verts; // Cubic Bezier vertices.
// Some files appear to wrap keyframes in arrays for no reason.
if (v.isArray() && v.size() == 1) {
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->isEmpty());
if (!verts.empty()) {
shape->moveTo(verts.front());
}
const auto& addCubic = [&](int from, int to) {
shape->cubicTo(verts[from] + outPts[from],
verts[to] + inPts[to],
verts[to]);
};
for (int i = 1; i < verts.count(); ++i) {
addCubic(i - 1, i);
}
if (!verts.empty() && ParseBool(v["c"], false)) {
addCubic(verts.count() - 1, 0);
shape->close();
}
return true;
}
template <>
size_t ValueTraits<ShapeValue>::Cardinality(const ShapeValue& path) {
return SkTo<size_t>(path.countVerbs());
}
template <>
template <>
SkPath ValueTraits<ShapeValue>::As<SkPath>(const ShapeValue& path) {
return path;
}
CompositeRRect::CompositeRRect(sk_sp<sksg::RRect> wrapped_node)
: fRRectNode(std::move(wrapped_node)) {}
void CompositeRRect::apply() {
// BM "position" == "center position"
auto rr = SkRRect::MakeRectXY(SkRect::MakeXYWH(fPosition.x() - fSize.width() / 2,
fPosition.y() - fSize.height() / 2,
fSize.width(), fSize.height()),
fRadius.width(),
fRadius.height());
fRRectNode->setRRect(rr);
}
CompositeTransform::CompositeTransform(sk_sp<sksg::Matrix> matrix)
: fMatrixNode(std::move(matrix)) {}
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
fMatrixNode->setMatrix(t);
}
CompositePolyStar::CompositePolyStar(sk_sp<sksg::Path> wrapped_node, Type t)
: fPathNode(std::move(wrapped_node))
, fType(t) {}
void CompositePolyStar::apply() {
const auto count = SkScalarTruncToInt(fPointCount);
const auto arc = SK_ScalarPI * 2 / count;
const auto pt_on_circle = [](const SkPoint& c, SkScalar r, SkScalar a) {
return SkPoint::Make(c.x() + r * std::cos(a),
c.y() + r * std::sin(a));
};
// TODO: inner/outer "roundness"?
SkPath poly;
auto angle = SkDegreesToRadians(fRotation);
poly.moveTo(pt_on_circle(fPosition, fOuterRadius, angle));
for (int i = 0; i < count; ++i) {
if (fType == Type::kStar) {
poly.lineTo(pt_on_circle(fPosition, fInnerRadius, angle + arc * 0.5f));
}
angle += arc;
poly.lineTo(pt_on_circle(fPosition, fOuterRadius, angle));
}
poly.close();
fPathNode->setPath(poly);
}
} // namespace skotty
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