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45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_PlaybackType_h
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#define mozilla_image_PlaybackType_h
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#include "imgIContainer.h"
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namespace mozilla {
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namespace image {
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/**
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* PlaybackType identifies a surface cache entry as either a static surface or
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* an animation. Note that a specific cache entry is one or the other, but
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* images may be associated with both types of cache entries, since in some
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* circumstances we may want to treat an animated image as if it were static.
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*/
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enum class PlaybackType : uint8_t
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{
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eStatic, // Calls to DrawableRef() will always return the same surface.
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eAnimated // An animation; calls to DrawableRef() may return different
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// surfaces at different times.
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};
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/**
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* Given an imgIContainer FRAME_* value, returns the corresponding PlaybackType
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* for use in surface cache lookups.
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*/
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inline PlaybackType
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ToPlaybackType(uint32_t aWhichFrame)
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{
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MOZ_ASSERT(aWhichFrame == imgIContainer::FRAME_FIRST ||
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aWhichFrame == imgIContainer::FRAME_CURRENT);
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return aWhichFrame == imgIContainer::FRAME_CURRENT
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? PlaybackType::eAnimated
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: PlaybackType::eStatic;
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}
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_PlaybackType_h
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