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Diffstat (limited to '')
| -rw-r--r-- | accessible/ipc/win/HandlerProvider.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/accessible/ipc/win/HandlerProvider.h b/accessible/ipc/win/HandlerProvider.h new file mode 100644 index 0000000000..f517a0f991 --- /dev/null +++ b/accessible/ipc/win/HandlerProvider.h @@ -0,0 +1,145 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_a11y_HandlerProvider_h +#define mozilla_a11y_HandlerProvider_h + +#include "mozilla/a11y/AccessibleHandler.h" +#include "mozilla/a11y/HandlerDataCleanup.h" +#include "mozilla/AlreadyAddRefed.h" +#include "mozilla/Atomics.h" +#include "mozilla/mscom/IHandlerProvider.h" +#include "mozilla/mscom/Ptr.h" +#include "mozilla/mscom/StructStream.h" +#include "mozilla/Mutex.h" +#include "mozilla/UniquePtr.h" +#include "HandlerData.h" + +struct NEWEST_IA2_INTERFACE; + +namespace mozilla { + +namespace mscom { + +class StructToStream; + +} // namespace mscom + +namespace a11y { + +class HandlerProvider final : public IGeckoBackChannel, + public mscom::IHandlerProvider { + public: + HandlerProvider(REFIID aIid, mscom::InterceptorTargetPtr<IUnknown> aTarget); + + // IUnknown + STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override; + STDMETHODIMP_(ULONG) AddRef() override; + STDMETHODIMP_(ULONG) Release() override; + + // IHandlerProvider + STDMETHODIMP GetHandler(NotNull<CLSID*> aHandlerClsid) override; + STDMETHODIMP GetHandlerPayloadSize(NotNull<mscom::IInterceptor*> aInterceptor, + NotNull<DWORD*> aOutPayloadSize) override; + STDMETHODIMP WriteHandlerPayload(NotNull<mscom::IInterceptor*> aInterceptor, + NotNull<IStream*> aStream) override; + STDMETHODIMP_(REFIID) MarshalAs(REFIID aIid) override; + STDMETHODIMP DisconnectHandlerRemotes() override; + STDMETHODIMP IsInterfaceMaybeSupported(REFIID aIid) override; + STDMETHODIMP_(REFIID) + GetEffectiveOutParamIid(REFIID aCallIid, ULONG aCallMethod) override; + STDMETHODIMP NewInstance( + REFIID aIid, mscom::InterceptorTargetPtr<IUnknown> aTarget, + NotNull<mscom::IHandlerProvider**> aOutNewPayload) override; + + // IGeckoBackChannel + STDMETHODIMP put_HandlerControl(long aPid, IHandlerControl* aCtrl) override; + STDMETHODIMP Refresh(DynamicIA2Data* aOutData) override; + STDMETHODIMP get_AllTextInfo(BSTR* aText, IAccessibleHyperlink*** aHyperlinks, + long* aNHyperlinks, IA2TextSegment** aAttribRuns, + long* aNAttribRuns) override; + STDMETHODIMP get_RelationsInfo(IARelationData** aRelations, + long* aNRelations) override; + STDMETHODIMP get_AllChildren(AccChildData** aChildren, + ULONG* aNChildren) override; + + private: + ~HandlerProvider() = default; + + void SetHandlerControlOnMainThread( + DWORD aPid, mscom::ProxyUniquePtr<IHandlerControl> aCtrl); + void GetAndSerializePayload(const MutexAutoLock&, + NotNull<mscom::IInterceptor*> aInterceptor); + void BuildStaticIA2Data(NotNull<mscom::IInterceptor*> aInterceptor, + StaticIA2Data* aOutData); + /** + * Pass true for aMarshaledByCom if this struct is being directly marshaled as + * an out parameter of a COM method, currently only + * IGeckoBackChannel::Refresh. + * When aMarshaledByCom is false, this means the struct is being marshaled + * by RPC encoding functions. This means we must allocate memory differently, + * even though we're using this as part of a COM handler payload. + */ + void BuildDynamicIA2Data(DynamicIA2Data* aOutIA2Data, + bool aMarshaledByCom = false); + void BuildInitialIA2Data(NotNull<mscom::IInterceptor*> aInterceptor, + StaticIA2Data* aOutStaticData, + DynamicIA2Data* aOutDynamicData); + bool IsTargetInterfaceCacheable(); + + /** + * Build the payload for later marshaling. + * This is intended to be used during a bulk fetch operation and must only be + * called from the main thread. + */ + void PrebuildPayload(NotNull<mscom::IInterceptor*> aInterceptor); + + // Replace a raw object from the main thread with a wrapped, intercepted + // object suitable for calling from the MTA. + // The reference to the original object is adopted; i.e. you should not + // separately release it. + // This is intended for objects returned from method calls on the main thread. + template <typename Interface> + HRESULT ToWrappedObject(Interface** aObj); + void GetAllTextInfoMainThread(BSTR* aText, + IAccessibleHyperlink*** aHyperlinks, + long* aNHyperlinks, + IA2TextSegment** aAttribRuns, + long* aNAttribRuns, HRESULT* result); + void GetRelationsInfoMainThread(IARelationData** aRelations, + long* aNRelations, HRESULT* result); + void GetAllChildrenMainThread(AccChildData** aChildren, ULONG* aNChildren, + HRESULT* result); + + Atomic<uint32_t> mRefCnt; + Mutex mMutex MOZ_UNANNOTATED; // Protects mSerializer + const IID mTargetUnkIid; + mscom::InterceptorTargetPtr<IUnknown> + mTargetUnk; // Constant, main thread only + UniquePtr<mscom::StructToStream> mSerializer; + RefPtr<IUnknown> mFastMarshalUnk; + + struct IA2PayloadDeleter { + void operator()(IA2Payload* aPayload) { + // When CoMarshalInterface writes interfaces out to a stream, it AddRefs. + // Therefore, we must release our references after this. + ReleaseStaticIA2DataInterfaces(aPayload->mStaticData); + CleanupDynamicIA2Data(aPayload->mDynamicData); + delete aPayload; + } + }; + using IA2PayloadPtr = UniquePtr<IA2Payload, IA2PayloadDeleter>; + + // Used when the payload is built prior to marshaling the object by a bulk + // fetch operation. See prebuildPayload(). + IA2PayloadPtr mPayload; + Mutex mPayloadMutex MOZ_UNANNOTATED; // Protects mPayload +}; + +} // namespace a11y +} // namespace mozilla + +#endif // mozilla_a11y_HandlerProvider_h |