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/* -*- Mode: C++; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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_gfx_config_gfxVars_h
#define mozilla_gfx_config_gfxVars_h
#include <stdint.h>
#include "mozilla/Assertions.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/gfx/GraphicsMessages.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/gfx/Types.h"
#include "nsTArray.h"
#include "nsXULAppAPI.h"
namespace mozilla {
namespace gfx {
class gfxVarReceiver;
// Generator for graphics vars.
#define GFX_VARS_LIST(_) \
/* C++ Name, Data Type, Default Value */ \
_(ContentBackend, BackendType, BackendType::NONE) \
_(TileSize, IntSize, IntSize(-1, -1)) \
_(UseXRender, bool, false) \
_(OffscreenFormat, gfxImageFormat, mozilla::gfx::SurfaceFormat::X8R8G8B8_UINT32) \
_(RequiresAcceleratedGLContextForCompositorOGL, bool, false) \
_(CanUseHardwareVideoDecoding, bool, false) \
_(PDMWMFDisableD3D11Dlls, nsCString, nsCString()) \
_(PDMWMFDisableD3D9Dlls, nsCString, nsCString()) \
/* Add new entries above this line. */
// Some graphics settings are computed on the UI process and must be
// communicated to content and GPU processes. gfxVars helps facilitate
// this. Its function is similar to gfxPrefs, except rather than hold
// user preferences, it holds dynamically computed values.
//
// Each variable in GFX_VARS_LIST exposes the following static methods:
//
// const DataType& CxxName();
// void SetCxxName(const DataType& aValue);
//
// Note that the setter may only be called in the UI process; a gfxVar must be
// a variable that is determined in the UI process and pushed to child
// processes.
class gfxVars final
{
public:
static void Initialize();
static void Shutdown();
static void ApplyUpdate(const GfxVarUpdate& aUpdate);
static void AddReceiver(gfxVarReceiver* aReceiver);
static void RemoveReceiver(gfxVarReceiver* aReceiver);
// Return a list of updates for all variables with non-default values.
static nsTArray<GfxVarUpdate> FetchNonDefaultVars();
public:
// Each variable must expose Set and Get methods for IPDL.
class VarBase
{
public:
VarBase();
virtual void SetValue(const GfxVarValue& aValue) = 0;
virtual void GetValue(GfxVarValue* aOutValue) = 0;
virtual bool HasDefaultValue() const = 0;
size_t Index() const {
return mIndex;
}
private:
size_t mIndex;
};
private:
static StaticAutoPtr<gfxVars> sInstance;
static StaticAutoPtr<nsTArray<VarBase*>> sVarList;
template <typename T, T Default()>
class VarImpl final : public VarBase
{
public:
VarImpl()
: mValue(Default())
{}
void SetValue(const GfxVarValue& aValue) override {
aValue.get(&mValue);
}
void GetValue(GfxVarValue* aOutValue) override {
*aOutValue = GfxVarValue(mValue);
}
bool HasDefaultValue() const override {
return mValue == Default();
}
const T& Get() const {
return mValue;
}
// Return true if the value changed, false otherwise.
bool Set(const T& aValue) {
MOZ_ASSERT(XRE_IsParentProcess());
if (mValue == aValue) {
return false;
}
mValue = aValue;
return true;
}
private:
T mValue;
};
#define GFX_VAR_DECL(CxxName, DataType, DefaultValue) \
private: \
static DataType Get##CxxName##Default() { \
return DefaultValue; \
} \
VarImpl<DataType, Get##CxxName##Default> mVar##CxxName; \
public: \
static const DataType& CxxName() { \
return sInstance->mVar##CxxName.Get(); \
} \
static void Set##CxxName(const DataType& aValue) { \
if (sInstance->mVar##CxxName.Set(aValue)) { \
sInstance->NotifyReceivers(&sInstance->mVar##CxxName); \
} \
}
GFX_VARS_LIST(GFX_VAR_DECL)
#undef GFX_VAR_DECL
private:
gfxVars();
void NotifyReceivers(VarBase* aVar);
private:
nsTArray<gfxVarReceiver*> mReceivers;
};
#undef GFX_VARS_LIST
} // namespace gfx
} // namespace mozilla
#endif // mozilla_gfx_config_gfxVars_h
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