gecko/image/LookupResult.h

70 lines
2.0 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/. */
/**
* LookupResult is the return type of SurfaceCache's Lookup*() functions. It
* combines a surface with relevant metadata tracked by SurfaceCache.
*/
#ifndef mozilla_image_LookupResult_h
#define mozilla_image_LookupResult_h
#include "mozilla/Attributes.h"
#include "mozilla/Move.h"
#include "imgFrame.h"
namespace mozilla {
namespace image {
/**
* LookupResult is the return type of SurfaceCache's Lookup*() functions. It
* combines a surface with relevant metadata tracked by SurfaceCache.
*/
class MOZ_STACK_CLASS LookupResult
{
public:
LookupResult()
: mIsExactMatch(false)
{ }
LookupResult(LookupResult&& aOther)
: mDrawableRef(Move(aOther.mDrawableRef))
, mIsExactMatch(aOther.mIsExactMatch)
{ }
LookupResult(DrawableFrameRef&& aDrawableRef, bool aIsExactMatch)
: mDrawableRef(Move(aDrawableRef))
, mIsExactMatch(aIsExactMatch)
{ }
LookupResult& operator=(LookupResult&& aOther)
{
MOZ_ASSERT(&aOther != this, "Self-move-assignment is not supported");
mDrawableRef = Move(aOther.mDrawableRef);
mIsExactMatch = aOther.mIsExactMatch;
return *this;
}
DrawableFrameRef& DrawableRef() { return mDrawableRef; }
const DrawableFrameRef& DrawableRef() const { return mDrawableRef; }
/// @return true if this LookupResult contains a surface.
explicit operator bool() const { return bool(mDrawableRef); }
/// @return true if the surface is an exact match for the Lookup*() arguments.
bool IsExactMatch() const { return mIsExactMatch; }
private:
LookupResult(const LookupResult&) = delete;
DrawableFrameRef mDrawableRef;
bool mIsExactMatch;
};
} // namespace image
} // namespace mozilla
#endif // mozilla_image_LookupResult_h