Source code

Revision control

Copy as Markdown

Other Tools

/* -*- 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_layers_AnimationHelper_h
#define mozilla_layers_AnimationHelper_h
#include "mozilla/dom/Nullable.h"
#include "mozilla/layers/AnimationStorageData.h"
#include "mozilla/layers/LayersMessages.h" // for TransformData, etc
#include "mozilla/webrender/WebRenderTypes.h" // for RenderRoot
#include "mozilla/TimeStamp.h" // for TimeStamp
#include "mozilla/TimingParams.h"
#include "mozilla/Types.h" // for SideBits
#include "X11UndefineNone.h"
#include <unordered_map>
namespace mozilla::layers {
class Animation;
class APZSampler;
class CompositorAnimationStorage;
struct AnimatedValue;
typedef nsTArray<layers::Animation> AnimationArray;
/**
* This utility class allows reusing code between the webrender and
* non-webrender compositor-side implementations. It provides
* utility functions for sampling animations at particular timestamps.
*/
class AnimationHelper {
public:
enum class SampleResult { None, Skipped, Sampled };
/**
* Sample animations based on a given time stamp for a element(layer) with
* its animation data.
* Generally |aPreviousFrameTime| is used for the sampling if it's
* supplied to make the animation more in sync with other animations on the
* main-thread. But in the case where the animation just started at the time
* when the animation was sent to the compositor, |aCurrentFrameTime| is used
* for sampling instead to avoid flicker.
*
* Returns SampleResult::None if none of the animations are producing a result
* (e.g. they are in the delay phase with no backwards fill),
* SampleResult::Skipped if the animation output did not change since the last
* call of this function,
* SampleResult::Sampled if the animation output was updated.
*
* Using the same example from ExtractAnimations (below):
*
* Input |aPropertyAnimationGroups| (ignoring the base animation style):
*
* [
* Group A: [ { rotate, Animation A }, { rotate, Animation B } ],
* Group B: [ { scale, Animation B } ],
* Group C: [ { transform, Animation A }, { transform, Animation B } ],
* ]
*
* For each property group, this function interpolates each animation in turn,
* using the result of interpolating one animation as input for the next such
* that it reduces each property group to a single output value:
*
* [
* { rotate, RawServoAnimationValue },
* { scale, RawServoAnimationValue },
* { transform, RawServoAnimationValue },
* ]
*
* For transform animations, the caller (SampleAnimations) will combine the
* result of the various transform properties into a final matrix.
*/
static SampleResult SampleAnimationForEachNode(
const APZSampler* aAPZSampler, const LayersId& aLayersId,
const MutexAutoLock& aProofOfMapLock, TimeStamp aPreviousFrameTime,
TimeStamp aCurrentFrameTime, const AnimatedValue* aPreviousValue,
nsTArray<PropertyAnimationGroup>& aPropertyAnimationGroups,
nsTArray<RefPtr<RawServoAnimationValue>>& aAnimationValues);
/**
* Extract organized animation data by property into an array of
* PropertyAnimationGroup objects.
*
* For example, suppose we have the following animations:
*
* Animation A: [ transform, rotate ]
* Animation B: [ rotate, scale ]
* Animation C: [ transform ]
* Animation D: [ opacity ]
*
* When we go to send transform-like properties to the compositor, we
* sort them as follows:
*
* [
* { rotate: Animation A (rotate segments only) },
* { rotate: Animation B ( " " ) },
* { scale: Animation B (scale segments only) },
* { transform: Animation A (transform segments only) },
* { transform: Animation C ( " " ) },
* ]
*
* In this function, we group these animations together by property producing
* output such as the following:
*
* [
* [ { rotate, Animation A }, { rotate, Animation B } ],
* [ { scale, Animation B } ],
* [ { transform, Animation A }, { transform, Animation B } ],
* ]
*
* In the process of grouping these animations, we also convert their values
* from the rather compact representation we use for transferring across the
* IPC boundary into something we can readily use for sampling.
*/
static AnimationStorageData ExtractAnimations(
const LayersId& aLayersId, const AnimationArray& aAnimations);
/**
* Get a unique id to represent the compositor animation between child
* and parent side. This id will be used as a key to store animation
* data in the CompositorAnimationStorage per compositor.
* Each layer on the content side calls this when it gets new animation
* data.
*/
static uint64_t GetNextCompositorAnimationsId();
/**
* Convert an array of animation values into a matrix given the corresponding
* transform parameters. |aValue| must be a transform-like value
* (e.g. transform, translate etc.).
*/
static gfx::Matrix4x4 ServoAnimationValueToMatrix4x4(
const nsTArray<RefPtr<RawServoAnimationValue>>& aValue,
const TransformData& aTransformData, gfx::Path* aCachedMotionPath);
/**
* Returns true if |aPrerenderedRect| transformed by |aTransform| were
* composited in |aClipRect| there appears area which wasn't pre-rendered
* on the main-thread. I.e. checkerboarding.
*/
static bool ShouldBeJank(const LayoutDeviceRect& aPrerenderedRect,
SideBits aOverflowedSides,
const gfx::Matrix4x4& aTransform,
const ParentLayerRect& aClipRect);
};
} // namespace mozilla::layers
#endif // mozilla_layers_AnimationHelper_h