149 lines
4.8 KiB
C++
149 lines
4.8 KiB
C++
/* -*- Mode: C++; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_gfx_config_gfxVars_h
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#define mozilla_gfx_config_gfxVars_h
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#include <stdint.h>
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#include "mozilla/Assertions.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/gfx/GraphicsMessages.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/gfx/Types.h"
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#include "nsTArray.h"
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#include "nsXULAppAPI.h"
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namespace mozilla {
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namespace gfx {
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class gfxVarReceiver;
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// Generator for graphics vars.
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#define GFX_VARS_LIST(_) \
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/* C++ Name, Data Type, Default Value */ \
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_(BrowserTabsRemoteAutostart, bool, false) \
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_(ContentBackend, BackendType, BackendType::NONE) \
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_(TileSize, IntSize, IntSize(-1, -1)) \
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_(UseXRender, bool, false) \
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_(OffscreenFormat, gfxImageFormat, mozilla::gfx::SurfaceFormat::X8R8G8B8_UINT32) \
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_(RequiresAcceleratedGLContextForCompositorOGL, bool, false) \
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_(CanUseHardwareVideoDecoding, bool, false) \
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_(PDMWMFDisableD3D11Dlls, nsCString, nsCString()) \
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_(PDMWMFDisableD3D9Dlls, nsCString, nsCString()) \
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/* Add new entries above this line. */
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// Some graphics settings are computed on the UI process and must be
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// communicated to content and GPU processes. gfxVars helps facilitate
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// this. Its function is similar to gfxPrefs, except rather than hold
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// user preferences, it holds dynamically computed values.
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//
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// Each variable in GFX_VARS_LIST exposes the following static methods:
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//
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// const DataType& CxxName();
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// void SetCxxName(const DataType& aValue);
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//
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// Note that the setter may only be called in the UI process; a gfxVar must be
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// a variable that is determined in the UI process and pushed to child
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// processes.
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class gfxVars final
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{
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public:
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static void Initialize();
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static void Shutdown();
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static void ApplyUpdate(const GfxVarUpdate& aUpdate);
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static void AddReceiver(gfxVarReceiver* aReceiver);
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static void RemoveReceiver(gfxVarReceiver* aReceiver);
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// Return a list of updates for all variables with non-default values.
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static nsTArray<GfxVarUpdate> FetchNonDefaultVars();
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public:
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// Each variable must expose Set and Get methods for IPDL.
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class VarBase
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{
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public:
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VarBase();
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virtual void SetValue(const GfxVarValue& aValue) = 0;
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virtual void GetValue(GfxVarValue* aOutValue) = 0;
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virtual bool HasDefaultValue() const = 0;
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size_t Index() const {
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return mIndex;
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}
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private:
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size_t mIndex;
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};
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private:
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static StaticAutoPtr<gfxVars> sInstance;
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static StaticAutoPtr<nsTArray<VarBase*>> sVarList;
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template <typename T, T Default()>
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class VarImpl final : public VarBase
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{
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public:
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VarImpl()
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: mValue(Default())
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{}
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void SetValue(const GfxVarValue& aValue) override {
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aValue.get(&mValue);
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}
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void GetValue(GfxVarValue* aOutValue) override {
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*aOutValue = GfxVarValue(mValue);
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}
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bool HasDefaultValue() const override {
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return mValue == Default();
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}
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const T& Get() const {
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return mValue;
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}
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// Return true if the value changed, false otherwise.
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bool Set(const T& aValue) {
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MOZ_ASSERT(XRE_IsParentProcess());
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if (mValue == aValue) {
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return false;
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}
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mValue = aValue;
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return true;
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}
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private:
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T mValue;
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};
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#define GFX_VAR_DECL(CxxName, DataType, DefaultValue) \
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private: \
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static DataType Get##CxxName##Default() { \
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return DefaultValue; \
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} \
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VarImpl<DataType, Get##CxxName##Default> mVar##CxxName; \
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public: \
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static const DataType& CxxName() { \
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return sInstance->mVar##CxxName.Get(); \
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} \
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static void Set##CxxName(const DataType& aValue) { \
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if (sInstance->mVar##CxxName.Set(aValue)) { \
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sInstance->NotifyReceivers(&sInstance->mVar##CxxName); \
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} \
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}
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GFX_VARS_LIST(GFX_VAR_DECL)
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#undef GFX_VAR_DECL
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private:
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gfxVars();
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void NotifyReceivers(VarBase* aVar);
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private:
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nsTArray<gfxVarReceiver*> mReceivers;
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};
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#undef GFX_VARS_LIST
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} // namespace gfx
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} // namespace mozilla
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#endif // mozilla_gfx_config_gfxVars_h
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