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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 "SkottieJson.h"
#include "SkData.h"
#include "SkScalar.h"
#include "SkPath.h"
#include "SkPoint.h"
#include "SkStream.h"
#include "SkString.h"
#include "SkottieValue.h"
#include "rapidjson/error/en.h"
#include "rapidjson/prettywriter.h"
#include "rapidjson/stringbuffer.h"
#include <vector>
namespace skottie {
namespace json {
template <>
bool ValueRef::to<SkScalar>(SkScalar* v) const {
if (!fValue) return false;
// Some versions wrap values as single-element arrays.
if (fValue->IsArray() && fValue->Size() == 1) {
return ValueRef(fValue->operator[](0)).to(v);
}
if (!fValue->IsNumber())
return false;
*v = static_cast<SkScalar>(fValue->GetDouble());
return true;
}
template <>
bool ValueRef::to<bool>(bool* v) const {
if (!fValue) return false;
switch(fValue->GetType()) {
case rapidjson::kNumberType:
*v = SkToBool(fValue->GetDouble());
return true;
case rapidjson::kFalseType:
case rapidjson::kTrueType:
*v = fValue->GetBool();
return true;
default:
break;
}
return false;
}
template <>
bool ValueRef::to<int>(int* v) const {
if (!fValue || !fValue->IsInt())
return false;
*v = fValue->GetInt();
return true;
}
template <>
bool ValueRef::to<SkString>(SkString* v) const {
if (!fValue || !fValue->IsString())
return false;
v->set(fValue->GetString());
return true;
}
template <>
bool ValueRef::to<SkPoint>(SkPoint* v) const {
if (!fValue || !fValue->IsObject())
return false;
const auto jvx = ValueRef(this->operator[]("x")),
jvy = ValueRef(this->operator[]("y"));
// Some BM versions seem to store x/y as single-element arrays.
return ValueRef(jvx.isArray() ? jvx.operator[](size_t(0)) : jvx).to(&v->fX)
&& ValueRef(jvy.isArray() ? jvy.operator[](size_t(0)) : jvy).to(&v->fY);
}
template <>
bool ValueRef::to<std::vector<float>>(std::vector<float>* v) const {
if (!fValue || !fValue->IsArray())
return false;
v->resize(fValue->Size());
for (size_t i = 0; i < fValue->Size(); ++i) {
if (!ValueRef(fValue->operator[](i)).to(v->data() + i)) {
return false;
}
}
return true;
}
namespace {
bool ParsePointVec(const ValueRef& jv, std::vector<SkPoint>* pts) {
if (!jv.isArray())
return false;
pts->clear();
pts->reserve(jv.size());
std::vector<float> vec;
for (size_t i = 0; i < jv.size(); ++i) {
if (!jv[i].to(&vec) || vec.size() != 2)
return false;
pts->push_back(SkPoint::Make(vec[0], vec[1]));
}
return true;
}
} // namespace
template <>
bool ValueRef::to<ShapeValue>(ShapeValue* v) const {
SkASSERT(v->fVertices.empty());
if (!fValue)
return false;
// Some versions wrap values as single-element arrays.
if (fValue->IsArray() && fValue->Size() == 1) {
return ValueRef(fValue->operator[](0)).to(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 (!fValue->IsObject() ||
!ParsePointVec(this->operator[]("i"), &inPts) ||
!ParsePointVec(this->operator[]("o"), &outPts) ||
!ParsePointVec(this->operator[]("v"), &verts) ||
inPts.size() != outPts.size() ||
inPts.size() != verts.size()) {
return false;
}
v->fVertices.reserve(inPts.size());
for (size_t i = 0; i < inPts.size(); ++i) {
v->fVertices.push_back(BezierVertex({inPts[i], outPts[i], verts[i]}));
}
v->fClosed = this->operator[]("c").toDefault<bool>(false);
return true;
}
size_t ValueRef::size() const {
return this->isArray() ? fValue->Size() : 0;
}
ValueRef ValueRef::operator[](size_t i) const {
return i < this->size() ? ValueRef(fValue->operator[](i)) : ValueRef();
}
ValueRef ValueRef::operator[](const char* key) const {
if (!this->isObject())
return ValueRef();
const auto m = fValue->FindMember(key);
return m == fValue->MemberEnd() ? ValueRef() : ValueRef(m->value);
}
const rapidjson::Value* ValueRef::begin() const {
return this->isArray() ? fValue->Begin() : nullptr;
}
const rapidjson::Value* ValueRef::end() const {
return this->isArray() ? fValue->End() : nullptr;
}
SkString ValueRef::toString() const {
#ifdef SK_DEBUG
rapidjson::StringBuffer buf;
if (fValue) {
rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(buf);
fValue->Accept(writer);
}
return SkString(buf.GetString());
#else
return SkString();
#endif // SK_DEBUG
}
Document::Document(SkStream* stream) {
if (!stream->hasLength()) {
SkDebugf("!! unsupported unseekable json stream\n");
return;
}
// RapidJSON provides three DOM-builder approaches:
//
// 1) in-place : all data buffered, constructs the DOM in-place -- this is the fastest
// 2) from buffer: all data buffered, copies to DOM -- this is slightly slower
// 3) from stream: streamed data, reads/copies to DOM -- this is *significantly* slower
//
// We like fast, so #1 it is.
// The buffer needs to be C-string.
const auto size = stream->getLength();
fData = SkData::MakeUninitialized(size + 1);
if (stream->read(fData->writable_data(), size) < size) {
SkDebugf("!! could not read JSON stream\n");
return;
}
auto data = static_cast<char*>(fData->writable_data());
data[size] = '\0';
fDocument.ParseInsitu(data);
#ifdef SK_DEBUG
if (fDocument.HasParseError()) {
SkDebugf("!! failed to parse json: %s\n",
rapidjson::GetParseError_En(fDocument.GetParseError()));
}
#endif
}
} // namespace json
} // namespace skottie
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