/* This Source Code Form is subject to the terms of the Mozilla Public *License,v.2.0.IfacopyoftheMPLwasnotdistributedwiththis
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Visibility states for frames. enumclass Visibility : uint8_t { // Indicates that we're not tracking visibility for this frame.
Untracked,
// Indicates that the frame is probably nonvisible. Visible frames *may* be // ApproximatelyNonVisible because approximate visibility is not updated // synchronously. Some truly nonvisible frames may be marked // ApproximatelyVisible instead if our heuristics lead us to think they may // be visible soon.
ApproximatelyNonVisible,
// Indicates that the frame is either visible now or is likely to be visible // soon according to our heuristics. As with ApproximatelyNonVisible , it's // important to note that approximately visibility is not updated // synchronously, so this information may be out of date.
ApproximatelyVisible,
};
// Requested actions when frames transition to the nonvisible state. enumclass OnNonvisible : uint8_t {
DiscardImages // Discard images associated with the frame.
};
} // namespace mozilla
#endif// mozilla_layout_generic_Visibility_h
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