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gecko-dev/dom/animation/EffectCompositor.h

33 строки
887 B
C
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Bug 1226118 part 8 - Add EffectCompositor::GetAnimationsForCompositor that uses the EffectSet rather than AnimationCollection; r=dholbert This added method should behave in an equivalent manner to the existing CommonAnimationManager::GetAnimationsForCompositor except for the following differences: * It uses the EffectSet attached to a target element rather than one of the AnimationCollection object on the owning element. * It returns an array of Animation objects consisting of only those Animations that actually have the specified property as opposed to the AnimationCollection consisting of *all* CSS animations or *all* CSS transitions for the element regardless of whether they run on the compositor or not. It may not be obvious why these two methods otherwise behave in an equivalent fashion so the following explains how the existing code is mirrored in the new method. The existing code is as follows: > AnimationCollection* > CommonAnimationManager::GetAnimationsForCompositor(const nsIFrame* aFrame, > nsCSSProperty aProperty) > { > AnimationCollection* collection = GetAnimationCollection(aFrame); > if (!collection || > !collection->HasCurrentAnimationOfProperty(aProperty) || > !collection->CanPerformOnCompositorThread(aFrame)) { > return nullptr; > } > > // This animation can be done on the compositor. > return collection; > } The new EffectCompositor::GetAnimationsForCompositor begins with two checks performed at the beginning of CanPerformOnCompositorThread: the checks for whether async animations are enabled or not and whether the frame has refused async animations since these are cheap and it makes sense to check them first. The next part of EffectCompositor::GetAnimationsForCompositor checks if there is an EffectSet associated with the frame. This is equivalent to the check whether |collection| is null or not above. Following, we iterate through the effects in the EffectSet. We first check if each effect is playing or not. In the above code, HasCurrentAnimationOfProperty only checks if the effect is *current* or not. However, CanPerformOnCompositorThread will only return true if it finds an animation that can run on the compositor that is *playing*. Since playing is a strict subset of current we only need to perform the more restrictive test. Next we check if the effect should block running other animations on the compositor. This is equivalent to the remainder of CanPerformOnCompositorThread. Note that the order is important here. Only playing animations should block other animations from running on the compositor. Furthermore, this needs to happen before the following step since animations of property other than |aProperty| can still block animations from running on the compositor. Finally, we check if the effect has an animation of |aProperty|. This is equivalent to the remainder of HasCurrentAnimationOfProperty. If all these checks succeed, we add the effect's animation to the result to return.
2015-12-04 02:34:12 +03:00
/* -*- 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/. */
#ifndef mozilla_EffectCompositor_h
#define mozilla_EffectCompositor_h
#include "mozilla/RefPtr.h"
#include "nsTArray.h"
namespace mozilla {
namespace dom {
class Animation;
}
class EffectCompositor
{
public:
Bug 1230056 part 1 - Add EffectCompositor::HasAnimationsForCompositor; r=dholbert
2015-12-10 00:28:10 +03:00
static bool HasAnimationsForCompositor(const nsIFrame* aFrame,
nsCSSProperty aProperty);
Bug 1226118 part 8 - Add EffectCompositor::GetAnimationsForCompositor that uses the EffectSet rather than AnimationCollection; r=dholbert This added method should behave in an equivalent manner to the existing CommonAnimationManager::GetAnimationsForCompositor except for the following differences: * It uses the EffectSet attached to a target element rather than one of the AnimationCollection object on the owning element. * It returns an array of Animation objects consisting of only those Animations that actually have the specified property as opposed to the AnimationCollection consisting of *all* CSS animations or *all* CSS transitions for the element regardless of whether they run on the compositor or not. It may not be obvious why these two methods otherwise behave in an equivalent fashion so the following explains how the existing code is mirrored in the new method. The existing code is as follows: > AnimationCollection* > CommonAnimationManager::GetAnimationsForCompositor(const nsIFrame* aFrame, > nsCSSProperty aProperty) > { > AnimationCollection* collection = GetAnimationCollection(aFrame); > if (!collection || > !collection->HasCurrentAnimationOfProperty(aProperty) || > !collection->CanPerformOnCompositorThread(aFrame)) { > return nullptr; > } > > // This animation can be done on the compositor. > return collection; > } The new EffectCompositor::GetAnimationsForCompositor begins with two checks performed at the beginning of CanPerformOnCompositorThread: the checks for whether async animations are enabled or not and whether the frame has refused async animations since these are cheap and it makes sense to check them first. The next part of EffectCompositor::GetAnimationsForCompositor checks if there is an EffectSet associated with the frame. This is equivalent to the check whether |collection| is null or not above. Following, we iterate through the effects in the EffectSet. We first check if each effect is playing or not. In the above code, HasCurrentAnimationOfProperty only checks if the effect is *current* or not. However, CanPerformOnCompositorThread will only return true if it finds an animation that can run on the compositor that is *playing*. Since playing is a strict subset of current we only need to perform the more restrictive test. Next we check if the effect should block running other animations on the compositor. This is equivalent to the remainder of CanPerformOnCompositorThread. Note that the order is important here. Only playing animations should block other animations from running on the compositor. Furthermore, this needs to happen before the following step since animations of property other than |aProperty| can still block animations from running on the compositor. Finally, we check if the effect has an animation of |aProperty|. This is equivalent to the remainder of HasCurrentAnimationOfProperty. If all these checks succeed, we add the effect's animation to the result to return.
2015-12-04 02:34:12 +03:00
static nsTArray<RefPtr<dom::Animation>>
GetAnimationsForCompositor(const nsIFrame* aFrame,
nsCSSProperty aProperty);
};
} // namespace mozilla
#endif // mozilla_EffectCompositor_h