From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- layout/generic/Visibility.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 layout/generic/Visibility.h (limited to 'layout/generic/Visibility.h') diff --git a/layout/generic/Visibility.h b/layout/generic/Visibility.h new file mode 100644 index 0000000000..a5fbbdbde7 --- /dev/null +++ b/layout/generic/Visibility.h @@ -0,0 +1,45 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +/** + * Declares visibility-related types. @Visibility is an enumeration of the + * possible visibility states of a frame. @OnNonvisible is an enumeration that + * allows callers to request a specific action when a frame transitions from + * visible to nonvisible. + */ + +#ifndef mozilla_layout_generic_Visibility_h +#define mozilla_layout_generic_Visibility_h + +namespace mozilla { + +// Visibility states for frames. +enum class 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it's + // important to note that approximately visibility is not updated + // synchronously, so this information may be out of date.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. +enum class OnNonvisible : uint8_t { + DiscardImages // Discard images associated with the frame. +}; + +} // namespace mozilla + +#endif // mozilla_layout_generic_Visibility_h -- cgit v1.2.3