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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkottieParser.h"
#include "SkJSONCPP.h"
#include "SkScalar.h"
#include "SkPath.h"
#include "SkPoint.h"
#include "SkString.h"
#include <vector>
namespace skottie {
template <>
bool Parse<SkScalar>(const Json::Value& jv, SkScalar* v) {
// Some versions wrap values as single-element arrays.
if (jv.isArray() && jv.size() == 1) {
return Parse(jv[0], v);
}
if (jv.isNull() || !jv.isConvertibleTo(Json::realValue))
return false;
*v = jv.asFloat();
return true;
}
template <>
bool Parse<bool>(const Json::Value& jv, bool* v) {
if (jv.isNull() || !jv.isConvertibleTo(Json::booleanValue))
return false;
*v = jv.asBool();
return true;
}
template <>
bool Parse<int>(const Json::Value& jv, int* v) {
if (jv.isNull() || !jv.isConvertibleTo(Json::intValue))
return false;
*v = jv.asInt();
return true;
}
template <>
bool Parse<SkString>(const Json::Value& jv, SkString* v) {
if (jv.isNull() || !jv.isConvertibleTo(Json::stringValue))
return false;
v->set(jv.isString() ? jv.asCString() : jv.asString().c_str());
return true;
}
template <>
bool Parse<SkPoint>(const Json::Value& jv, SkPoint* v) {
if (!jv.isObject())
return false;
const auto& jvx = jv["x"],
jvy = jv["y"];
// Some BM versions seem to store x/y as single-element arrays.
return Parse(jvx.isArray() ? jvx[0] : jvx, &v->fX)
&& Parse(jvy.isArray() ? jvy[0] : jvy, &v->fY);
}
template <>
bool Parse<std::vector<float>>(const Json::Value& jv, std::vector<float>* v) {
if (!jv.isArray())
return false;
v->resize(jv.size());
for (Json::ArrayIndex i = 0; i < jv.size(); ++i) {
if (!Parse(jv[i], v->data() + i)) {
return false;
}
}
return true;
}
namespace {
bool ParsePointVec(const Json::Value& jv, std::vector<SkPoint>* pts) {
if (!jv.isArray())
return false;
pts->clear();
pts->reserve(jv.size());
std::vector<float> vec;
for (Json::ArrayIndex i = 0; i < jv.size(); ++i) {
if (!Parse(jv[i], &vec) || vec.size() != 2)
return false;
pts->push_back(SkPoint::Make(vec[0], vec[1]));
}
return true;
}
} // namespace
template <>
bool Parse<SkPath>(const Json::Value& jv, SkPath* v) {
SkASSERT(v->isEmpty());
// Some versions wrap values as single-element arrays.
if (jv.isArray() && jv.size() == 1) {
return Parse(jv[0], v);
}
std::vector<SkPoint> inPts, // Cubic Bezier "in" control points, relative to vertices.
outPts, // Cubic Bezier "out" control points, relative to vertices.
verts; // Cubic Bezier vertices.
if (!jv.isObject() ||
!ParsePointVec(jv["i"], &inPts) ||
!ParsePointVec(jv["o"], &outPts) ||
!ParsePointVec(jv["v"], &verts) ||
inPts.size() != outPts.size() ||
inPts.size() != verts.size()) {
return false;
}
if (!verts.empty()) {
v->moveTo(verts.front());
}
const auto& addCubic = [&](size_t from, size_t to) {
v->cubicTo(verts[from] + outPts[from],
verts[to] + inPts[to],
verts[to]);
};
for (size_t i = 1; i < verts.size(); ++i) {
addCubic(i - 1, i);
}
if (!verts.empty() && ParseDefault(jv["c"], false)) {
addCubic(verts.size() - 1, 0);
v->close();
}
return true;
}
} // nasmespace skottie
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