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/*
* Copyright 2018 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkFlattenablePriv_DEFINED
#define SkFlattenablePriv_DEFINED
#include "SkFlattenable.h"
/*
* Flattening is straight-forward:
* 1. call getFactory() so we have a function-ptr to recreate the subclass
* 2. call flatten(buffer) to write out enough data for the factory to read
*
* Unflattening is easy for the caller: new_instance = factory(buffer)
*
* The complexity of supporting this is as follows.
*
* If your subclass wants to control unflattening, use this macro in your declaration:
* SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS
* This will provide a getFactory(), and require that the subclass implements CreateProc.
*
* For older buffers (before the DEEPFLATTENING change, the macros below declare
* a thin factory DeepCreateProc. It checks the version of the buffer, and if it is pre-deep,
* then it calls through to a (usually protected) constructor, passing the buffer.
* If the buffer is newer, then it directly calls the "real" factory: CreateProc.
*/
#define SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() static void InitializeFlattenables();
#define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(flattenable) \
void flattenable::InitializeFlattenables() {
#define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END \
}
#define SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(flattenable) \
SkFlattenable::Register(#flattenable, flattenable::CreateProc, \
flattenable::GetFlattenableType());
#define SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(flattenable) \
private: \
static sk_sp<SkFlattenable> CreateProc(SkReadBuffer&); \
friend class SkFlattenable::PrivateInitializer; \
public: \
Factory getFactory() const override { return CreateProc; }
/** For SkFlattenable derived objects with a valid type
This macro should only be used in base class objects in core
*/
#define SK_DEFINE_FLATTENABLE_TYPE(flattenable) \
static Type GetFlattenableType() { \
return k##flattenable##_Type; \
} \
Type getFlattenableType() const override { \
return k##flattenable##_Type; \
} \
static sk_sp<flattenable> Deserialize(const void* data, size_t size, \
const SkDeserialProcs* procs = nullptr) { \
return sk_sp<flattenable>(static_cast<flattenable*>( \
SkFlattenable::Deserialize( \
k##flattenable##_Type, data, size, procs).release()));\
}
#endif
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