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gecko-dev/gfx/layers/composite/AsyncCompositionManager.cpp
Jeff Muizelaar 34032eed5e Bug 1064479. Redo how screen rotation is implemented on B2G/Layers. r=nical,mwoodrow 
Currently we use a world transform on the LayerManager. This gets passed to the
screen render target which adjusts the gl transform to accomplish the rotation.
This causes a lot of the system to have to know about the transform.

Instead we can just bake the transform into the root layer's shadow transform.
Everything now mostly just works.

--HG--
extra : rebase_source : e0e170d191eef5887a2e6b17f71ac79037033006
2014-09-10 15:59:00 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=2 et 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/. */
#include "mozilla/layers/AsyncCompositionManager.h"
#include <stdint.h> // for uint32_t
#include "CompositorParent.h" // for CompositorParent, etc
#include "FrameMetrics.h" // for FrameMetrics
#include "LayerManagerComposite.h" // for LayerManagerComposite, etc
#include "Layers.h" // for Layer, ContainerLayer, etc
#include "gfxPoint.h" // for gfxPoint, gfxSize
#include "mozilla/StyleAnimationValue.h" // for StyleAnimationValue, etc
#include "mozilla/WidgetUtils.h" // for ComputeTransformForRotation
#include "mozilla/dom/AnimationPlayer.h" // for AnimationPlayer
#include "mozilla/gfx/BaseRect.h" // for BaseRect
#include "mozilla/gfx/Point.h" // for RoundedToInt, PointTyped
#include "mozilla/gfx/Rect.h" // for RoundedToInt, RectTyped
#include "mozilla/gfx/ScaleFactor.h" // for ScaleFactor
#include "mozilla/layers/AsyncPanZoomController.h"
#include "mozilla/layers/Compositor.h" // for Compositor
#include "mozilla/layers/LayerMetricsWrapper.h" // for LayerMetricsWrapper
#include "nsCSSPropList.h"
#include "nsCoord.h" // for NSAppUnitsToFloatPixels, etc
#include "nsDebug.h" // for NS_ASSERTION, etc
#include "nsDeviceContext.h" // for nsDeviceContext
#include "nsDisplayList.h" // for nsDisplayTransform, etc
#include "nsMathUtils.h" // for NS_round
#include "nsPoint.h" // for nsPoint
#include "nsRect.h" // for nsIntRect
#include "nsRegion.h" // for nsIntRegion
#include "nsTArray.h" // for nsTArray, nsTArray_Impl, etc
#include "nsTArrayForwardDeclare.h" // for InfallibleTArray
#if defined(MOZ_WIDGET_ANDROID)
# include <android/log.h>
# include "AndroidBridge.h"
#endif
#include "GeckoProfiler.h"
struct nsCSSValueSharedList;
namespace mozilla {
namespace layers {
using namespace mozilla::gfx;
enum Op { Resolve, Detach };
static bool
IsSameDimension(dom::ScreenOrientation o1, dom::ScreenOrientation o2)
{
bool isO1portrait = (o1 == dom::eScreenOrientation_PortraitPrimary || o1 == dom::eScreenOrientation_PortraitSecondary);
bool isO2portrait = (o2 == dom::eScreenOrientation_PortraitPrimary || o2 == dom::eScreenOrientation_PortraitSecondary);
return !(isO1portrait ^ isO2portrait);
}
static bool
ContentMightReflowOnOrientationChange(const nsIntRect& rect)
{
return rect.width != rect.height;
}
template<Op OP>
static void
WalkTheTree(Layer* aLayer,
bool& aReady,
const TargetConfig& aTargetConfig)
{
if (RefLayer* ref = aLayer->AsRefLayer()) {
if (const CompositorParent::LayerTreeState* state = CompositorParent::GetIndirectShadowTree(ref->GetReferentId())) {
if (Layer* referent = state->mRoot) {
if (!ref->GetVisibleRegion().IsEmpty()) {
dom::ScreenOrientation chromeOrientation = aTargetConfig.orientation();
dom::ScreenOrientation contentOrientation = state->mTargetConfig.orientation();
if (!IsSameDimension(chromeOrientation, contentOrientation) &&
ContentMightReflowOnOrientationChange(aTargetConfig.naturalBounds())) {
aReady = false;
}
}
if (OP == Resolve) {
ref->ConnectReferentLayer(referent);
} else {
ref->DetachReferentLayer(referent);
WalkTheTree<OP>(referent, aReady, aTargetConfig);
}
}
}
}
for (Layer* child = aLayer->GetFirstChild();
child; child = child->GetNextSibling()) {
WalkTheTree<OP>(child, aReady, aTargetConfig);
}
}
void
AsyncCompositionManager::ResolveRefLayers()
{
if (!mLayerManager->GetRoot()) {
return;
}
mReadyForCompose = true;
WalkTheTree<Resolve>(mLayerManager->GetRoot(),
mReadyForCompose,
mTargetConfig);
}
void
AsyncCompositionManager::DetachRefLayers()
{
if (!mLayerManager->GetRoot()) {
return;
}
WalkTheTree<Detach>(mLayerManager->GetRoot(),
mReadyForCompose,
mTargetConfig);
}
void
AsyncCompositionManager::ComputeRotation()
{
if (!mTargetConfig.naturalBounds().IsEmpty()) {
mWorldTransform =
ComputeTransformForRotation(mTargetConfig.naturalBounds(),
mTargetConfig.rotation());
}
}
static bool
GetBaseTransform2D(Layer* aLayer, Matrix* aTransform)
{
// Start with the animated transform if there is one
return (aLayer->AsLayerComposite()->GetShadowTransformSetByAnimation() ?
aLayer->GetLocalTransform() : aLayer->GetTransform()).Is2D(aTransform);
}
static void
TranslateShadowLayer2D(Layer* aLayer,
const gfxPoint& aTranslation,
bool aAdjustClipRect)
{
// This layer might also be a scrollable layer and have an async transform.
// To make sure we don't clobber that, we start with the shadow transform.
// Any adjustments to the shadow transform made in this function in previous
// frames have been cleared in ClearAsyncTransforms(), so such adjustments
// will not compound over successive frames.
Matrix layerTransform;
if (!aLayer->GetLocalTransform().Is2D(&layerTransform)) {
return;
}
// Apply the 2D translation to the layer transform.
layerTransform._31 += aTranslation.x;
layerTransform._32 += aTranslation.y;
// The transform already takes the resolution scale into account. Since we
// will apply the resolution scale again when computing the effective
// transform, we must apply the inverse resolution scale here.
Matrix4x4 layerTransform3D = Matrix4x4::From2D(layerTransform);
if (ContainerLayer* c = aLayer->AsContainerLayer()) {
layerTransform3D.Scale(1.0f/c->GetPreXScale(),
1.0f/c->GetPreYScale(),
1);
}
layerTransform3D = layerTransform3D *
Matrix4x4().Scale(1.0f/aLayer->GetPostXScale(),
1.0f/aLayer->GetPostYScale(),
1);
LayerComposite* layerComposite = aLayer->AsLayerComposite();
layerComposite->SetShadowTransform(layerTransform3D);
layerComposite->SetShadowTransformSetByAnimation(false);
const nsIntRect* clipRect = aLayer->GetClipRect();
if (aAdjustClipRect && clipRect) {
nsIntRect transformedClipRect(*clipRect);
transformedClipRect.MoveBy(aTranslation.x, aTranslation.y);
layerComposite->SetShadowClipRect(&transformedClipRect);
}
}
static bool
AccumulateLayerTransforms2D(Layer* aLayer,
Layer* aAncestor,
Matrix& aMatrix)
{
// Accumulate the transforms between this layer and the subtree root layer.
for (Layer* l = aLayer; l && l != aAncestor; l = l->GetParent()) {
Matrix l2D;
if (!GetBaseTransform2D(l, &l2D)) {
return false;
}
aMatrix *= l2D;
}
return true;
}
static LayerPoint
GetLayerFixedMarginsOffset(Layer* aLayer,
const LayerMargin& aFixedLayerMargins)
{
// Work out the necessary translation, in root scrollable layer space.
// Because fixed layer margins are stored relative to the root scrollable
// layer, we can just take the difference between these values.
LayerPoint translation;
const LayerPoint& anchor = aLayer->GetFixedPositionAnchor();
const LayerMargin& fixedMargins = aLayer->GetFixedPositionMargins();
if (fixedMargins.left >= 0) {
if (anchor.x > 0) {
translation.x -= aFixedLayerMargins.right - fixedMargins.right;
} else {
translation.x += aFixedLayerMargins.left - fixedMargins.left;
}
}
if (fixedMargins.top >= 0) {
if (anchor.y > 0) {
translation.y -= aFixedLayerMargins.bottom - fixedMargins.bottom;
} else {
translation.y += aFixedLayerMargins.top - fixedMargins.top;
}
}
return translation;
}
static gfxFloat
IntervalOverlap(gfxFloat aTranslation, gfxFloat aMin, gfxFloat aMax)
{
// Determine the amount of overlap between the 1D vector |aTranslation|
// and the interval [aMin, aMax].
if (aTranslation > 0) {
return std::max(0.0, std::min(aMax, aTranslation) - std::max(aMin, 0.0));
} else {
return std::min(0.0, std::max(aMin, aTranslation) - std::min(aMax, 0.0));
}
}
void
AsyncCompositionManager::AlignFixedAndStickyLayers(Layer* aLayer,
Layer* aTransformedSubtreeRoot,
FrameMetrics::ViewID aTransformScrollId,
const Matrix4x4& aPreviousTransformForRoot,
const Matrix4x4& aCurrentTransformForRoot,
const LayerMargin& aFixedLayerMargins)
{
bool isRootFixed = aLayer->GetIsFixedPosition() &&
!aLayer->GetParent()->GetIsFixedPosition();
bool isStickyForSubtree = aLayer->GetIsStickyPosition() &&
aLayer->GetStickyScrollContainerId() == aTransformScrollId;
bool isFixedOrSticky = (isRootFixed || isStickyForSubtree);
// We want to process all the fixed and sticky children of
// aTransformedSubtreeRoot. Also, once we do encounter such a child, we don't
// need to recurse any deeper because the fixed layers are relative to their
// nearest scrollable layer.
if (!isFixedOrSticky) {
// ApplyAsyncContentTransformToTree will call this function again for
// nested scrollable layers, so we don't need to recurse if the layer is
// scrollable.
if (aLayer == aTransformedSubtreeRoot || !aLayer->HasScrollableFrameMetrics()) {
for (Layer* child = aLayer->GetFirstChild(); child; child = child->GetNextSibling()) {
AlignFixedAndStickyLayers(child, aTransformedSubtreeRoot, aTransformScrollId,
aPreviousTransformForRoot,
aCurrentTransformForRoot, aFixedLayerMargins);
}
}
return;
}
// Insert a translation so that the position of the anchor point is the same
// before and after the change to the transform of aTransformedSubtreeRoot.
// This currently only works for fixed layers with 2D transforms.
// Accumulate the transforms between this layer and the subtree root layer.
Matrix ancestorTransform;
if (!AccumulateLayerTransforms2D(aLayer->GetParent(), aTransformedSubtreeRoot,
ancestorTransform)) {
return;
}
Matrix oldRootTransform;
Matrix newRootTransform;
if (!aPreviousTransformForRoot.Is2D(&oldRootTransform) ||
!aCurrentTransformForRoot.Is2D(&newRootTransform)) {
return;
}
// Calculate the cumulative transforms between the subtree root with the
// old transform and the current transform.
Matrix oldCumulativeTransform = ancestorTransform * oldRootTransform;
Matrix newCumulativeTransform = ancestorTransform * newRootTransform;
if (newCumulativeTransform.IsSingular()) {
return;
}
Matrix newCumulativeTransformInverse = newCumulativeTransform;
newCumulativeTransformInverse.Invert();
// Now work out the translation necessary to make sure the layer doesn't
// move given the new sub-tree root transform.
Matrix layerTransform;
if (!GetBaseTransform2D(aLayer, &layerTransform)) {
return;
}
// Calculate any offset necessary, in previous transform sub-tree root
// space. This is used to make sure fixed position content respects
// content document fixed position margins.
LayerPoint offsetInOldSubtreeLayerSpace = GetLayerFixedMarginsOffset(aLayer, aFixedLayerMargins);
// Add the above offset to the anchor point so we can offset the layer by
// and amount that's specified in old subtree layer space.
const LayerPoint& anchorInOldSubtreeLayerSpace = aLayer->GetFixedPositionAnchor();
LayerPoint offsetAnchorInOldSubtreeLayerSpace = anchorInOldSubtreeLayerSpace + offsetInOldSubtreeLayerSpace;
// Add the local layer transform to the two points to make the equation
// below this section more convenient.
Point anchor(anchorInOldSubtreeLayerSpace.x, anchorInOldSubtreeLayerSpace.y);
Point offsetAnchor(offsetAnchorInOldSubtreeLayerSpace.x, offsetAnchorInOldSubtreeLayerSpace.y);
Point locallyTransformedAnchor = layerTransform * anchor;
Point locallyTransformedOffsetAnchor = layerTransform * offsetAnchor;
// Transforming the locallyTransformedAnchor by oldCumulativeTransform
// returns the layer's anchor point relative to the parent of
// aTransformedSubtreeRoot, before the new transform was applied.
// Then, applying newCumulativeTransformInverse maps that point relative
// to the layer's parent, which is the same coordinate space as
// locallyTransformedAnchor again, allowing us to subtract them and find
// out the offset necessary to make sure the layer stays stationary.
Point oldAnchorPositionInNewSpace =
newCumulativeTransformInverse * (oldCumulativeTransform * locallyTransformedOffsetAnchor);
Point translation = oldAnchorPositionInNewSpace - locallyTransformedAnchor;
if (aLayer->GetIsStickyPosition()) {
// For sticky positioned layers, the difference between the two rectangles
// defines a pair of translation intervals in each dimension through which
// the layer should not move relative to the scroll container. To
// accomplish this, we limit each dimension of the |translation| to that
// part of it which overlaps those intervals.
const LayerRect& stickyOuter = aLayer->GetStickyScrollRangeOuter();
const LayerRect& stickyInner = aLayer->GetStickyScrollRangeInner();
translation.y = IntervalOverlap(translation.y, stickyOuter.y, stickyOuter.YMost()) -
IntervalOverlap(translation.y, stickyInner.y, stickyInner.YMost());
translation.x = IntervalOverlap(translation.x, stickyOuter.x, stickyOuter.XMost()) -
IntervalOverlap(translation.x, stickyInner.x, stickyInner.XMost());
}
// Finally, apply the 2D translation to the layer transform. Note that in
// general we need to apply the same translation to the layer's clip rect, so
// that the effective transform on the clip rect takes it back to where it was
// originally, had there been no async scroll. In the case where the
// fixed/sticky layer is the same as aTransformedSubtreeRoot, then the clip
// rect is not affected by the scroll-induced async scroll transform anyway
// (since the clip is applied post-transform) so we don't need to make the
// adjustment.
TranslateShadowLayer2D(aLayer, ThebesPoint(translation), aLayer != aTransformedSubtreeRoot);
}
static void
SampleValue(float aPortion, Animation& aAnimation, StyleAnimationValue& aStart,
StyleAnimationValue& aEnd, Animatable* aValue)
{
StyleAnimationValue interpolatedValue;
NS_ASSERTION(aStart.GetUnit() == aEnd.GetUnit() ||
aStart.GetUnit() == StyleAnimationValue::eUnit_None ||
aEnd.GetUnit() == StyleAnimationValue::eUnit_None,
"Must have same unit");
StyleAnimationValue::Interpolate(aAnimation.property(), aStart, aEnd,
aPortion, interpolatedValue);
if (aAnimation.property() == eCSSProperty_opacity) {
*aValue = interpolatedValue.GetFloatValue();
return;
}
nsCSSValueSharedList* interpolatedList =
interpolatedValue.GetCSSValueSharedListValue();
TransformData& data = aAnimation.data().get_TransformData();
nsPoint origin = data.origin();
// we expect all our transform data to arrive in css pixels, so here we must
// adjust to dev pixels.
double cssPerDev = double(nsDeviceContext::AppUnitsPerCSSPixel())
/ double(data.appUnitsPerDevPixel());
Point3D transformOrigin = data.transformOrigin();
transformOrigin.x = transformOrigin.x * cssPerDev;
transformOrigin.y = transformOrigin.y * cssPerDev;
Point3D perspectiveOrigin = data.perspectiveOrigin();
perspectiveOrigin.x = perspectiveOrigin.x * cssPerDev;
perspectiveOrigin.y = perspectiveOrigin.y * cssPerDev;
nsDisplayTransform::FrameTransformProperties props(interpolatedList,
transformOrigin,
perspectiveOrigin,
data.perspective());
gfx3DMatrix transform =
nsDisplayTransform::GetResultingTransformMatrix(props, origin,
data.appUnitsPerDevPixel(),
&data.bounds());
Point3D scaledOrigin =
Point3D(NS_round(NSAppUnitsToFloatPixels(origin.x, data.appUnitsPerDevPixel())),
NS_round(NSAppUnitsToFloatPixels(origin.y, data.appUnitsPerDevPixel())),
0.0f);
transform.Translate(scaledOrigin);
InfallibleTArray<TransformFunction> functions;
functions.AppendElement(TransformMatrix(ToMatrix4x4(transform)));
*aValue = functions;
}
static bool
SampleAnimations(Layer* aLayer, TimeStamp aPoint)
{
AnimationArray& animations = aLayer->GetAnimations();
InfallibleTArray<AnimData>& animationData = aLayer->GetAnimationData();
bool activeAnimations = false;
for (uint32_t i = animations.Length(); i-- !=0; ) {
Animation& animation = animations[i];
AnimData& animData = animationData[i];
activeAnimations = true;
TimeDuration elapsedDuration = aPoint - animation.startTime();
// Skip animations that are yet to start.
//
// Currently, this should only happen when the refresh driver is under test
// control and is made to produce a time in the past or is restored from
// test control causing it to jump backwards in time.
//
// Since activeAnimations is true, this could mean we keep compositing
// unnecessarily during the delay, but so long as this only happens while
// the refresh driver is under test control that should be ok.
if (elapsedDuration.ToSeconds() < 0) {
continue;
}
AnimationTiming timing;
timing.mIterationDuration = animation.duration();
// Currently animations run on the compositor have their delay factored
// into their start time, hence the delay is effectively zero.
timing.mDelay = TimeDuration(0);
timing.mIterationCount = animation.iterationCount();
timing.mDirection = animation.direction();
// Animations typically only run on the compositor during their active
// interval but if we end up sampling them outside that range (for
// example, while they are waiting to be removed) we currently just
// assume that we should fill.
timing.mFillMode = NS_STYLE_ANIMATION_FILL_MODE_BOTH;
ComputedTiming computedTiming =
dom::Animation::GetComputedTimingAt(
Nullable<TimeDuration>(elapsedDuration), timing);
NS_ABORT_IF_FALSE(0.0 <= computedTiming.mTimeFraction &&
computedTiming.mTimeFraction <= 1.0,
"time fraction should be in [0-1]");
int segmentIndex = 0;
AnimationSegment* segment = animation.segments().Elements();
while (segment->endPortion() < computedTiming.mTimeFraction) {
++segment;
++segmentIndex;
}
double positionInSegment =
(computedTiming.mTimeFraction - segment->startPortion()) /
(segment->endPortion() - segment->startPortion());
double portion =
animData.mFunctions[segmentIndex]->GetValue(positionInSegment);
// interpolate the property
Animatable interpolatedValue;
SampleValue(portion, animation, animData.mStartValues[segmentIndex],
animData.mEndValues[segmentIndex], &interpolatedValue);
LayerComposite* layerComposite = aLayer->AsLayerComposite();
switch (animation.property()) {
case eCSSProperty_opacity:
{
layerComposite->SetShadowOpacity(interpolatedValue.get_float());
break;
}
case eCSSProperty_transform:
{
Matrix4x4 matrix = interpolatedValue.get_ArrayOfTransformFunction()[0].get_TransformMatrix().value();
if (ContainerLayer* c = aLayer->AsContainerLayer()) {
matrix = matrix * Matrix4x4().Scale(c->GetInheritedXScale(),
c->GetInheritedYScale(),
1);
}
layerComposite->SetShadowTransform(matrix);
layerComposite->SetShadowTransformSetByAnimation(true);
break;
}
default:
NS_WARNING("Unhandled animated property");
}
}
for (Layer* child = aLayer->GetFirstChild(); child;
child = child->GetNextSibling()) {
activeAnimations |= SampleAnimations(child, aPoint);
}
return activeAnimations;
}
static bool
SampleAPZAnimations(const LayerMetricsWrapper& aLayer, TimeStamp aSampleTime)
{
bool activeAnimations = false;
for (LayerMetricsWrapper child = aLayer.GetFirstChild(); child;
child = child.GetNextSibling()) {
activeAnimations |= SampleAPZAnimations(child, aSampleTime);
}
if (AsyncPanZoomController* apzc = aLayer.GetApzc()) {
activeAnimations |= apzc->AdvanceAnimations(aSampleTime);
}
return activeAnimations;
}
Matrix4x4
AdjustAndCombineWithCSSTransform(const Matrix4x4& asyncTransform, Layer* aLayer)
{
Matrix4x4 result = asyncTransform;
// Container layers start at the origin, but they are clipped to where they
// actually have content on the screen. The tree transform is meant to apply
// to the clipped area. If the tree transform includes a scale component,
// then applying it to container as-is will produce incorrect results. To
// avoid this, translate the layer so that the clip rect starts at the origin,
// apply the tree transform, and translate back.
if (const nsIntRect* shadowClipRect = aLayer->AsLayerComposite()->GetShadowClipRect()) {
if (shadowClipRect->TopLeft() != nsIntPoint()) { // avoid a gratuitous change of basis
result.ChangeBasis(shadowClipRect->x, shadowClipRect->y, 0);
}
}
// Combine the async transform with the layer's CSS transform.
result = aLayer->GetTransform() * result;
return result;
}
bool
AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer)
{
bool appliedTransform = false;
for (Layer* child = aLayer->GetFirstChild();
child; child = child->GetNextSibling()) {
appliedTransform |=
ApplyAsyncContentTransformToTree(child);
}
LayerComposite* layerComposite = aLayer->AsLayerComposite();
Matrix4x4 oldTransform = aLayer->GetTransform();
Matrix4x4 combinedAsyncTransformWithoutOverscroll;
Matrix4x4 combinedAsyncTransform;
bool hasAsyncTransform = false;
LayerMargin fixedLayerMargins(0, 0, 0, 0);
for (uint32_t i = 0; i < aLayer->GetFrameMetricsCount(); i++) {
AsyncPanZoomController* controller = aLayer->GetAsyncPanZoomController(i);
if (!controller) {
continue;
}
hasAsyncTransform = true;
ViewTransform asyncTransformWithoutOverscroll;
Matrix4x4 overscrollTransform;
ScreenPoint scrollOffset;
controller->SampleContentTransformForFrame(&asyncTransformWithoutOverscroll,
scrollOffset,
&overscrollTransform);
if (!aLayer->IsScrollInfoLayer()) {
controller->MarkAsyncTransformAppliedToContent();
}
const FrameMetrics& metrics = aLayer->GetFrameMetrics(i);
CSSToLayerScale paintScale = metrics.LayersPixelsPerCSSPixel();
CSSRect displayPort(metrics.mCriticalDisplayPort.IsEmpty() ?
metrics.mDisplayPort : metrics.mCriticalDisplayPort);
ScreenPoint offset(0, 0);
// XXX this call to SyncFrameMetrics is not currently being used. It will be cleaned
// up as part of bug 776030 or one of its dependencies.
SyncFrameMetrics(scrollOffset, asyncTransformWithoutOverscroll.mScale.scale,
metrics.mScrollableRect, mLayersUpdated, displayPort,
paintScale, mIsFirstPaint, fixedLayerMargins, offset);
mIsFirstPaint = false;
mLayersUpdated = false;
// Apply the render offset
mLayerManager->GetCompositor()->SetScreenRenderOffset(offset);
combinedAsyncTransformWithoutOverscroll *= asyncTransformWithoutOverscroll;
combinedAsyncTransform *= (Matrix4x4(asyncTransformWithoutOverscroll) * overscrollTransform);
}
if (hasAsyncTransform) {
Matrix4x4 transform = AdjustAndCombineWithCSSTransform(combinedAsyncTransform, aLayer);
// GetTransform already takes the pre- and post-scale into account. Since we
// will apply the pre- and post-scale again when computing the effective
// transform, we must apply the inverses here.
if (ContainerLayer* container = aLayer->AsContainerLayer()) {
transform.Scale(1.0f/container->GetPreXScale(),
1.0f/container->GetPreYScale(),
1);
}
transform = transform * Matrix4x4().Scale(1.0f/aLayer->GetPostXScale(),
1.0f/aLayer->GetPostYScale(),
1);
layerComposite->SetShadowTransform(transform);
NS_ASSERTION(!layerComposite->GetShadowTransformSetByAnimation(),
"overwriting animated transform!");
const FrameMetrics& bottom = LayerMetricsWrapper::BottommostScrollableMetrics(aLayer);
MOZ_ASSERT(bottom.IsScrollable()); // must be true because hasAsyncTransform is true
// Apply resolution scaling to the old transform - the layer tree as it is
// doesn't have the necessary transform to display correctly. We use the
// bottom-most scrollable metrics because that should have the most accurate
// cumulative resolution for aLayer.
LayoutDeviceToLayerScale resolution = bottom.mCumulativeResolution;
oldTransform.Scale(resolution.scale, resolution.scale, 1);
// For the purpose of aligning fixed and sticky layers, we disregard
// the overscroll transform when computing the 'aCurrentTransformForRoot'
// parameter. This ensures that the overscroll transform is not unapplied,
// and therefore that the visual effect applies to fixed and sticky layers.
Matrix4x4 transformWithoutOverscroll = AdjustAndCombineWithCSSTransform(
combinedAsyncTransformWithoutOverscroll, aLayer);
// Since fixed/sticky layers are relative to their nearest scrolling ancestor,
// we use the ViewID from the bottommost scrollable metrics here.
AlignFixedAndStickyLayers(aLayer, aLayer, bottom.GetScrollId(), oldTransform,
transformWithoutOverscroll, fixedLayerMargins);
appliedTransform = true;
}
if (aLayer->GetScrollbarDirection() != Layer::NONE) {
ApplyAsyncTransformToScrollbar(aLayer);
}
return appliedTransform;
}
static bool
LayerIsScrollbarTarget(const LayerMetricsWrapper& aTarget, Layer* aScrollbar)
{
AsyncPanZoomController* apzc = aTarget.GetApzc();
if (!apzc) {
return false;
}
const FrameMetrics& metrics = aTarget.Metrics();
if (metrics.GetScrollId() != aScrollbar->GetScrollbarTargetContainerId()) {
return false;
}
return !aTarget.IsScrollInfoLayer();
}
static void
ApplyAsyncTransformToScrollbarForContent(Layer* aScrollbar,
const LayerMetricsWrapper& aContent,
bool aScrollbarIsDescendant)
{
// We only apply the transform if the scroll-target layer has non-container
// children (i.e. when it has some possibly-visible content). This is to
// avoid moving scroll-bars in the situation that only a scroll information
// layer has been built for a scroll frame, as this would result in a
// disparity between scrollbars and visible content.
if (aContent.IsScrollInfoLayer()) {
return;
}
const FrameMetrics& metrics = aContent.Metrics();
AsyncPanZoomController* apzc = aContent.GetApzc();
Matrix4x4 asyncTransform = apzc->GetCurrentAsyncTransform();
Matrix4x4 nontransientTransform = apzc->GetNontransientAsyncTransform();
Matrix4x4 nontransientUntransform = nontransientTransform;
nontransientUntransform.Invert();
Matrix4x4 transientTransform = asyncTransform * nontransientUntransform;
// |transientTransform| represents the amount by which we have scrolled and
// zoomed since the last paint. Because the scrollbar was sized and positioned based
// on the painted content, we need to adjust it based on transientTransform so that
// it reflects what the user is actually seeing now.
// - The scroll thumb needs to be scaled in the direction of scrolling by the inverse
// of the transientTransform scale (representing the zoom). This is because zooming
// in decreases the fraction of the whole scrollable rect that is in view.
// - It needs to be translated in opposite direction of the transientTransform
// translation (representing the scroll). This is because scrolling down, which
// translates the layer content up, should result in moving the scroll thumb down.
// The amount of the translation to the scroll thumb should be such that the ratio
// of the translation to the size of the scroll port is the same as the ratio
// of the scroll amount to the size of the scrollable rect.
Matrix4x4 scrollbarTransform;
if (aScrollbar->GetScrollbarDirection() == Layer::VERTICAL) {
float scale = metrics.CalculateCompositedSizeInCssPixels().height / metrics.mScrollableRect.height;
scrollbarTransform = scrollbarTransform * Matrix4x4().Scale(1.f, 1.f / transientTransform._22, 1.f);
scrollbarTransform = scrollbarTransform * Matrix4x4().Translate(0, -transientTransform._42 * scale, 0);
}
if (aScrollbar->GetScrollbarDirection() == Layer::HORIZONTAL) {
float scale = metrics.CalculateCompositedSizeInCssPixels().width / metrics.mScrollableRect.width;
scrollbarTransform = scrollbarTransform * Matrix4x4().Scale(1.f / transientTransform._11, 1.f, 1.f);
scrollbarTransform = scrollbarTransform * Matrix4x4().Translate(-transientTransform._41 * scale, 0, 0);
}
Matrix4x4 transform = scrollbarTransform * aScrollbar->GetTransform();
if (aScrollbarIsDescendant) {
// If the scrollbar layer is a child of the content it is a scrollbar for, then we
// need to do an extra untransform to cancel out the transient async transform on
// the content. This is needed because otherwise that transient async transform is
// part of the effective transform of this scrollbar, and the scrollbar will jitter
// as the content scrolls.
transientTransform.Invert();
transform = transform * transientTransform;
}
// GetTransform already takes the pre- and post-scale into account. Since we
// will apply the pre- and post-scale again when computing the effective
// transform, we must apply the inverses here.
if (ContainerLayer* container = aScrollbar->AsContainerLayer()) {
transform.Scale(1.0f/container->GetPreXScale(),
1.0f/container->GetPreYScale(),
1);
}
transform = transform * Matrix4x4().Scale(1.0f/aScrollbar->GetPostXScale(),
1.0f/aScrollbar->GetPostYScale(),
1);
aScrollbar->AsLayerComposite()->SetShadowTransform(transform);
}
static LayerMetricsWrapper
FindScrolledLayerRecursive(Layer* aScrollbar, const LayerMetricsWrapper& aSubtreeRoot)
{
if (LayerIsScrollbarTarget(aSubtreeRoot, aScrollbar)) {
return aSubtreeRoot;
}
for (LayerMetricsWrapper child = aSubtreeRoot.GetFirstChild(); child;
child = child.GetNextSibling()) {
LayerMetricsWrapper target = FindScrolledLayerRecursive(aScrollbar, child);
if (target) {
return target;
}
}
return LayerMetricsWrapper();
}
static LayerMetricsWrapper
FindScrolledLayerForScrollbar(Layer* aScrollbar, bool* aOutIsAncestor)
{
// Search ancestors first.
LayerMetricsWrapper scrollbar(aScrollbar);
for (LayerMetricsWrapper ancestor = scrollbar; ancestor; ancestor = ancestor.GetParent()) {
if (LayerIsScrollbarTarget(ancestor, aScrollbar)) {
*aOutIsAncestor = true;
return ancestor;
}
}
// If the scrolled target is not an ancestor, search the whole layer tree.
// XXX It would be much better to search the APZC tree instead of the layer
// tree. That way we would ignore non-scrollable layers, and we'd only visit
// each scroll ID once. In the end we only need the APZC and the FrameMetrics
// of the scrolled target.
*aOutIsAncestor = false;
LayerMetricsWrapper root(aScrollbar->Manager()->GetRoot());
return FindScrolledLayerRecursive(aScrollbar, root);
}
void
AsyncCompositionManager::ApplyAsyncTransformToScrollbar(Layer* aLayer)
{
// If this layer corresponds to a scrollbar, then there should be a layer that
// is a previous sibling or a parent that has a matching ViewID on its FrameMetrics.
// That is the content that this scrollbar is for. We pick up the transient
// async transform from that layer and use it to update the scrollbar position.
// Note that it is possible that the content layer is no longer there; in
// this case we don't need to do anything because there can't be an async
// transform on the content.
bool isAncestor = false;
const LayerMetricsWrapper& scrollTarget = FindScrolledLayerForScrollbar(aLayer, &isAncestor);
if (scrollTarget) {
ApplyAsyncTransformToScrollbarForContent(aLayer, scrollTarget, isAncestor);
}
}
void
AsyncCompositionManager::TransformScrollableLayer(Layer* aLayer)
{
LayerComposite* layerComposite = aLayer->AsLayerComposite();
FrameMetrics metrics = LayerMetricsWrapper::TopmostScrollableMetrics(aLayer);
if (!metrics.IsScrollable()) {
// On Fennec it's possible that the there is no scrollable layer in the
// tree, and this function just gets called with the root layer. In that
// case TopmostScrollableMetrics will return an empty FrameMetrics but we
// still want to use the actual non-scrollable metrics from the layer.
metrics = LayerMetricsWrapper::BottommostMetrics(aLayer);
}
// We must apply the resolution scale before a pan/zoom transform, so we call
// GetTransform here.
Matrix4x4 oldTransform = aLayer->GetTransform();
CSSToLayerScale geckoZoom = metrics.LayersPixelsPerCSSPixel();
LayerIntPoint scrollOffsetLayerPixels = RoundedToInt(metrics.GetScrollOffset() * geckoZoom);
if (mIsFirstPaint) {
mContentRect = metrics.mScrollableRect;
SetFirstPaintViewport(scrollOffsetLayerPixels,
geckoZoom,
mContentRect);
mIsFirstPaint = false;
} else if (!metrics.mScrollableRect.IsEqualEdges(mContentRect)) {
mContentRect = metrics.mScrollableRect;
SetPageRect(mContentRect);
}
// We synchronise the viewport information with Java after sending the above
// notifications, so that Java can take these into account in its response.
// Calculate the absolute display port to send to Java
LayerIntRect displayPort = RoundedToInt(
(metrics.mCriticalDisplayPort.IsEmpty()
? metrics.mDisplayPort
: metrics.mCriticalDisplayPort
) * geckoZoom);
displayPort += scrollOffsetLayerPixels;
LayerMargin fixedLayerMargins(0, 0, 0, 0);
ScreenPoint offset(0, 0);
// Ideally we would initialize userZoom to AsyncPanZoomController::CalculateResolution(metrics)
// but this causes a reftest-ipc test to fail (see bug 883646 comment 27). The reason for this
// appears to be that metrics.mZoom is poorly initialized in some scenarios. In these scenarios,
// however, we can assume there is no async zooming in progress and so the following statement
// works fine.
CSSToScreenScale userZoom(metrics.mDevPixelsPerCSSPixel * metrics.mCumulativeResolution * LayerToScreenScale(1));
ScreenPoint userScroll = metrics.GetScrollOffset() * userZoom;
SyncViewportInfo(displayPort, geckoZoom, mLayersUpdated,
userScroll, userZoom, fixedLayerMargins,
offset);
mLayersUpdated = false;
// Apply the render offset
mLayerManager->GetCompositor()->SetScreenRenderOffset(offset);
// Handle transformations for asynchronous panning and zooming. We determine the
// zoom used by Gecko from the transformation set on the root layer, and we
// determine the scroll offset used by Gecko from the frame metrics of the
// primary scrollable layer. We compare this to the user zoom and scroll
// offset in the view transform we obtained from Java in order to compute the
// transformation we need to apply.
ScreenPoint geckoScroll(0, 0);
if (metrics.IsScrollable()) {
geckoScroll = metrics.GetScrollOffset() * userZoom;
}
ParentLayerToScreenScale scale = userZoom
/ metrics.mDevPixelsPerCSSPixel
/ metrics.GetParentResolution();
ScreenPoint translation = userScroll - geckoScroll;
Matrix4x4 treeTransform = ViewTransform(scale, -translation);
// The transform already takes the resolution scale into account. Since we
// will apply the resolution scale again when computing the effective
// transform, we must apply the inverse resolution scale here.
Matrix4x4 computedTransform = oldTransform * treeTransform;
if (ContainerLayer* container = aLayer->AsContainerLayer()) {
computedTransform.Scale(1.0f/container->GetPreXScale(),
1.0f/container->GetPreYScale(),
1);
}
computedTransform.ScalePost(1.0f/aLayer->GetPostXScale(),
1.0f/aLayer->GetPostYScale(),
1);
layerComposite->SetShadowTransform(computedTransform);
NS_ASSERTION(!layerComposite->GetShadowTransformSetByAnimation(),
"overwriting animated transform!");
// Apply resolution scaling to the old transform - the layer tree as it is
// doesn't have the necessary transform to display correctly.
oldTransform.Scale(metrics.mResolution.scale, metrics.mResolution.scale, 1);
// Make sure that overscroll and under-zoom are represented in the old
// transform so that fixed position content moves and scales accordingly.
// These calculations will effectively scale and offset fixed position layers
// in screen space when the compensatory transform is performed in
// AlignFixedAndStickyLayers.
ScreenRect contentScreenRect = mContentRect * userZoom;
Point3D overscrollTranslation;
if (userScroll.x < contentScreenRect.x) {
overscrollTranslation.x = contentScreenRect.x - userScroll.x;
} else if (userScroll.x + metrics.mCompositionBounds.width > contentScreenRect.XMost()) {
overscrollTranslation.x = contentScreenRect.XMost() -
(userScroll.x + metrics.mCompositionBounds.width);
}
if (userScroll.y < contentScreenRect.y) {
overscrollTranslation.y = contentScreenRect.y - userScroll.y;
} else if (userScroll.y + metrics.mCompositionBounds.height > contentScreenRect.YMost()) {
overscrollTranslation.y = contentScreenRect.YMost() -
(userScroll.y + metrics.mCompositionBounds.height);
}
oldTransform.Translate(overscrollTranslation.x,
overscrollTranslation.y,
overscrollTranslation.z);
gfx::Size underZoomScale(1.0f, 1.0f);
if (mContentRect.width * userZoom.scale < metrics.mCompositionBounds.width) {
underZoomScale.width = (mContentRect.width * userZoom.scale) /
metrics.mCompositionBounds.width;
}
if (mContentRect.height * userZoom.scale < metrics.mCompositionBounds.height) {
underZoomScale.height = (mContentRect.height * userZoom.scale) /
metrics.mCompositionBounds.height;
}
oldTransform.Scale(underZoomScale.width, underZoomScale.height, 1);
// Make sure fixed position layers don't move away from their anchor points
// when we're asynchronously panning or zooming
AlignFixedAndStickyLayers(aLayer, aLayer, metrics.GetScrollId(), oldTransform,
aLayer->GetLocalTransform(), fixedLayerMargins);
}
void
ClearAsyncTransforms(Layer* aLayer)
{
if (!aLayer->AsLayerComposite()->GetShadowTransformSetByAnimation()) {
aLayer->AsLayerComposite()->SetShadowTransform(aLayer->GetBaseTransform());
}
for (Layer* child = aLayer->GetFirstChild();
child; child = child->GetNextSibling()) {
ClearAsyncTransforms(child);
}
}
bool
AsyncCompositionManager::TransformShadowTree(TimeStamp aCurrentFrame)
{
PROFILER_LABEL("AsyncCompositionManager", "TransformShadowTree",
js::ProfileEntry::Category::GRAPHICS);
Layer* root = mLayerManager->GetRoot();
if (!root) {
return false;
}
// NB: we must sample animations *before* sampling pan/zoom
// transforms.
bool wantNextFrame = SampleAnimations(root, aCurrentFrame);
// Clear any async transforms (not due to animations) set in previous frames.
// This is necessary because some things called by
// ApplyAsyncContentTransformToTree (in particular, TranslateShadowLayer2D),
// add to the shadow transform rather than overwriting it.
ClearAsyncTransforms(root);
// FIXME/bug 775437: unify this interface with the ~native-fennec
// derived code
//
// Attempt to apply an async content transform to any layer that has
// an async pan zoom controller (which means that it is rendered
// async using Gecko). If this fails, fall back to transforming the
// primary scrollable layer. "Failing" here means that we don't
// find a frame that is async scrollable. Note that the fallback
// code also includes Fennec which is rendered async. Fennec uses
// its own platform-specific async rendering that is done partially
// in Gecko and partially in Java.
wantNextFrame |= SampleAPZAnimations(LayerMetricsWrapper(root), aCurrentFrame);
if (!ApplyAsyncContentTransformToTree(root)) {
nsAutoTArray<Layer*,1> scrollableLayers;
#ifdef MOZ_WIDGET_ANDROID
mLayerManager->GetRootScrollableLayers(scrollableLayers);
#else
mLayerManager->GetScrollableLayers(scrollableLayers);
#endif
for (uint32_t i = 0; i < scrollableLayers.Length(); i++) {
if (scrollableLayers[i]) {
TransformScrollableLayer(scrollableLayers[i]);
}
}
}
LayerComposite* rootComposite = root->AsLayerComposite();
gfx::Matrix4x4 trans = rootComposite->GetShadowTransform();
trans *= gfx::Matrix4x4::From2D(mWorldTransform);
rootComposite->SetShadowTransform(trans);
return wantNextFrame;
}
void
AsyncCompositionManager::SetFirstPaintViewport(const LayerIntPoint& aOffset,
const CSSToLayerScale& aZoom,
const CSSRect& aCssPageRect)
{
#ifdef MOZ_WIDGET_ANDROID
AndroidBridge::Bridge()->SetFirstPaintViewport(aOffset, aZoom, aCssPageRect);
#endif
}
void
AsyncCompositionManager::SetPageRect(const CSSRect& aCssPageRect)
{
#ifdef MOZ_WIDGET_ANDROID
AndroidBridge::Bridge()->SetPageRect(aCssPageRect);
#endif
}
void
AsyncCompositionManager::SyncViewportInfo(const LayerIntRect& aDisplayPort,
const CSSToLayerScale& aDisplayResolution,
bool aLayersUpdated,
ScreenPoint& aScrollOffset,
CSSToScreenScale& aScale,
LayerMargin& aFixedLayerMargins,
ScreenPoint& aOffset)
{
#ifdef MOZ_WIDGET_ANDROID
AndroidBridge::Bridge()->SyncViewportInfo(aDisplayPort,
aDisplayResolution,
aLayersUpdated,
aScrollOffset,
aScale,
aFixedLayerMargins,
aOffset);
#endif
}
void
AsyncCompositionManager::SyncFrameMetrics(const ScreenPoint& aScrollOffset,
float aZoom,
const CSSRect& aCssPageRect,
bool aLayersUpdated,
const CSSRect& aDisplayPort,
const CSSToLayerScale& aDisplayResolution,
bool aIsFirstPaint,
LayerMargin& aFixedLayerMargins,
ScreenPoint& aOffset)
{
#ifdef MOZ_WIDGET_ANDROID
AndroidBridge::Bridge()->SyncFrameMetrics(aScrollOffset, aZoom, aCssPageRect,
aLayersUpdated, aDisplayPort,
aDisplayResolution, aIsFirstPaint,
aFixedLayerMargins, aOffset);
#endif
}
} // namespace layers
} // namespace mozilla
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