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/* -*- 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 mozilla_image_PlaybackType_h
#define mozilla_image_PlaybackType_h
#include "imgIContainer.h"
namespace mozilla {
namespace image {
/**
* PlaybackType identifies a surface cache entry as either a static surface or
* an animation. Note that a specific cache entry is one or the other, but
* images may be associated with both types of cache entries, since in some
* circumstances we may want to treat an animated image as if it were static.
*/
enum class PlaybackType : uint8_t
{
eStatic, // Calls to DrawableRef() will always return the same surface.
eAnimated // An animation; calls to DrawableRef() may return different
// surfaces at different times.
};
/**
* Given an imgIContainer FRAME_* value, returns the corresponding PlaybackType
* for use in surface cache lookups.
*/
inline PlaybackType
ToPlaybackType(uint32_t aWhichFrame)
{
MOZ_ASSERT(aWhichFrame == imgIContainer::FRAME_FIRST ||
aWhichFrame == imgIContainer::FRAME_CURRENT);
return aWhichFrame == imgIContainer::FRAME_CURRENT
? PlaybackType::eAnimated
: PlaybackType::eStatic;
}
} // namespace image
} // namespace mozilla
#endif // mozilla_image_PlaybackType_h
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