gecko-dev/dom/camera/CameraPreferences.h

91 строка
3.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 DOM_CAMERA_CAMERAPREFERENCES_H
#define DOM_CAMERA_CAMERAPREFERENCES_H
#include "nsString.h"
#if defined(MOZ_HAVE_CXX11_STRONG_ENUMS) || defined(MOZ_HAVE_CXX11_ENUM_TYPE)
// Older compilers that don't support strongly-typed enums
// just typedef uint32_t to nsresult, which results in conflicting
// overloaded members in CameraPreferences.
#define CAMERAPREFERENCES_HAVE_SEPARATE_UINT32_AND_NSRESULT
#endif
namespace mozilla {
template<class T> class StaticAutoPtr;
class CameraPreferences
{
public:
static bool Initialize();
static void Shutdown();
static bool GetPref(const char* aPref, nsACString& aVal);
#ifdef CAMERAPREFERENCES_HAVE_SEPARATE_UINT32_AND_NSRESULT
static bool GetPref(const char* aPref, nsresult& aVal);
#endif
static bool GetPref(const char* aPref, uint32_t& aVal);
static bool GetPref(const char* aPref, bool& aVal);
protected:
static const uint32_t kPrefNotFound = UINT32_MAX;
static uint32_t PrefToIndex(const char* aPref);
static void PreferenceChanged(const char* aPref, void* aClosure);
#ifdef CAMERAPREFERENCES_HAVE_SEPARATE_UINT32_AND_NSRESULT
static nsresult UpdatePref(const char* aPref, nsresult& aVar);
#endif
static nsresult UpdatePref(const char* aPref, uint32_t& aVar);
static nsresult UpdatePref(const char* aPref, nsACString& aVar);
static nsresult UpdatePref(const char* aPref, bool& aVar);
enum PrefValueType {
kPrefValueIsNsResult,
kPrefValueIsUint32,
kPrefValueIsCString,
kPrefValueIsBoolean
};
struct Pref {
const char* const mPref;
PrefValueType mValueType;
union {
// The 'mAsVoid' member must be first and is required to allow 'mValue'
// to be initialized with any pointer type, as not all of our platforms
// support the use of designated initializers; in their absence, only
// the first element of a union can be statically initialized, and
// 'void*' lets us stuff any pointer type into it.
void* mAsVoid;
StaticAutoPtr<nsCString>* mAsCString;
nsresult* mAsNsResult;
uint32_t* mAsUint32;
bool* mAsBoolean;
} mValue;
};
static Pref sPrefs[];
static StaticAutoPtr<nsCString> sPrefTestEnabled;
static StaticAutoPtr<nsCString> sPrefHardwareTest;
static StaticAutoPtr<nsCString> sPrefGonkParameters;
static nsresult sPrefCameraControlMethodErrorOverride;
static nsresult sPrefCameraControlAsyncErrorOverride;
static uint32_t sPrefCameraControlLowMemoryThresholdMB;
static bool sPrefCameraParametersIsLowMemory;
private:
// static class only
CameraPreferences();
~CameraPreferences();
};
} // namespace mozilla
#endif // DOM_CAMERA_CAMERAPREFERENCES_H