bool
WheelScrollAnimation::DoSample(FrameMetrics& aFrameMetrics, const TimeDuration& aDelta)
{
  TimeStamp now = AsyncPanZoomController::GetFrameTime();
  CSSToParentLayerScale2D zoom = aFrameMetrics.GetZoom();

  // If the animation is finished, make sure the final position is correct by
  // using one last displacement. Otherwise, compute the delta via the timing
  // function as normal.
  bool finished = IsFinished(now);
  nsPoint sampledDest = finished
                        ? mDestination
                        : PositionAt(now);
  ParentLayerPoint displacement =
    (CSSPoint::FromAppUnits(sampledDest) - aFrameMetrics.GetScrollOffset()) * zoom;

  // Note: we ignore overscroll for wheel animations.
  ParentLayerPoint adjustedOffset, overscroll;
  mApzc.mX.AdjustDisplacement(displacement.x, adjustedOffset.x, overscroll.x);
  mApzc.mY.AdjustDisplacement(displacement.y, adjustedOffset.y, overscroll.y,
                              !aFrameMetrics.AllowVerticalScrollWithWheel());

  // If we expected to scroll, but there's no more scroll range on either axis,
  // then end the animation early. Note that the initial displacement could be 0
  // if the compositor ran very quickly (<1ms) after the animation was created.
  // When that happens we want to make sure the animation continues.
  if (!IsZero(displacement) && IsZero(adjustedOffset)) {
    // Nothing more to do - end the animation.
    return false;
  }

  aFrameMetrics.ScrollBy(adjustedOffset / zoom);
  return !finished;
}
bool
WheelScrollAnimation::DoSample(FrameMetrics& aFrameMetrics, const TimeDuration& aDelta)
{
  TimeStamp now = AsyncPanZoomController::GetFrameTime();
  CSSToParentLayerScale2D zoom = aFrameMetrics.GetZoom();

  // If the animation is finished, make sure the final position is correct by
  // using one last displacement. Otherwise, compute the delta via the timing
  // function as normal.
  bool finished = IsFinished(now);
  nsPoint sampledDest = finished
                        ? mDestination
                        : PositionAt(now);
  ParentLayerPoint displacement =
    (CSSPoint::FromAppUnits(sampledDest) - aFrameMetrics.GetScrollOffset()) * zoom;

  // Note: we ignore overscroll for wheel animations.
  ParentLayerPoint adjustedOffset, overscroll;
  mApzc.mX.AdjustDisplacement(displacement.x, adjustedOffset.x, overscroll.x);
  mApzc.mY.AdjustDisplacement(displacement.y, adjustedOffset.y, overscroll.y,
                              !aFrameMetrics.AllowVerticalScrollWithWheel());
  if (IsZero(adjustedOffset)) {
    // Nothing more to do - end the animation.
    return false;
  }

  aFrameMetrics.ScrollBy(adjustedOffset / zoom);
  return !finished;
}
Example #3
0
static void
SetDisplayPortMargins(nsIDOMWindowUtils* aUtils,
                      nsIContent* aContent,
                      FrameMetrics& aMetrics)
{
  if (!aContent) {
    return;
  }
  nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aContent);
  if (!element) {
    return;
  }

  ScreenMargin margins = aMetrics.GetDisplayPortMargins();
  aUtils->SetDisplayPortMarginsForElement(margins.left,
                                          margins.top,
                                          margins.right,
                                          margins.bottom,
                                          element, 0);
  CSSRect baseCSS = aMetrics.CalculateCompositedRectInCssPixels();
  nsRect base(0, 0,
              baseCSS.width * nsPresContext::AppUnitsPerCSSPixel(),
              baseCSS.height * nsPresContext::AppUnitsPerCSSPixel());
  nsLayoutUtils::SetDisplayPortBaseIfNotSet(aContent, base);
}
Example #4
0
void
APZCCallbackHelper::UpdateRootFrame(nsIDOMWindowUtils* aUtils,
                                    FrameMetrics& aMetrics)
{
    // Precondition checks
    MOZ_ASSERT(aUtils);
    if (aMetrics.mScrollId == FrameMetrics::NULL_SCROLL_ID) {
        return;
    }

    // Set the scroll port size, which determines the scroll range. For example if
    // a 500-pixel document is shown in a 100-pixel frame, the scroll port length would
    // be 100, and gecko would limit the maximum scroll offset to 400 (so as to prevent
    // overscroll). Note that if the content here was zoomed to 2x, the document would
    // be 1000 pixels long but the frame would still be 100 pixels, and so the maximum
    // scroll range would be 900. Therefore this calculation depends on the zoom applied
    // to the content relative to the container.
    CSSSize scrollPort = aMetrics.CalculateCompositedRectInCssPixels().Size();
    aUtils->SetScrollPositionClampingScrollPortSize(scrollPort.width, scrollPort.height);

    // Scroll the window to the desired spot
    nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.mScrollId);
    CSSPoint actualScrollOffset = ScrollFrameTo(sf, aMetrics.mScrollOffset);

    // Correct the display port due to the difference between mScrollOffset and the
    // actual scroll offset, possibly align it to tile boundaries (if tiled layers are
    // enabled), and clamp it to the scrollable rect.
    MaybeAlignAndClampDisplayPort(aMetrics, actualScrollOffset);
    aMetrics.mScrollOffset = actualScrollOffset;

    // The mZoom variable on the frame metrics stores the CSS-to-screen scale for this
    // frame. This scale includes all of the (cumulative) resolutions set on the presShells
    // from the root down to this frame. However, when setting the resolution, we only
    // want the piece of the resolution that corresponds to this presShell, rather than
    // all of the cumulative stuff, so we need to divide out the parent resolutions.
    // Finally, we multiply by a ScreenToLayerScale of 1.0f because the goal here is to
    // take the async zoom calculated by the APZC and tell gecko about it (turning it into
    // a "sync" zoom) which will update the resolution at which the layer is painted.
    mozilla::layers::ParentLayerToLayerScale presShellResolution =
        aMetrics.mZoom
        / aMetrics.mDevPixelsPerCSSPixel
        / aMetrics.GetParentResolution()
        * ScreenToLayerScale(1.0f);
    aUtils->SetResolution(presShellResolution.scale, presShellResolution.scale);

    // Finally, we set the displayport.
    nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(aMetrics.mScrollId);
    if (!content) {
        return;
    }
    nsCOMPtr<nsIDOMElement> element = do_QueryInterface(content);
    if (!element) {
        return;
    }
    aUtils->SetDisplayPortForElement(aMetrics.mDisplayPort.x,
                                     aMetrics.mDisplayPort.y,
                                     aMetrics.mDisplayPort.width,
                                     aMetrics.mDisplayPort.height,
                                     element);
}
Example #5
0
bool
ClientLayerManager::ProgressiveUpdateCallback(bool aHasPendingNewThebesContent,
                                              FrameMetrics& aMetrics,
                                              bool aDrawingCritical)
{
#ifdef MOZ_WIDGET_ANDROID
  MOZ_ASSERT(aMetrics.IsScrollable());
  // This is derived from the code in
  // gfx/layers/ipc/CompositorParent.cpp::TransformShadowTree.
  CSSToLayerScale paintScale = aMetrics.LayersPixelsPerCSSPixel();
  const CSSRect& metricsDisplayPort =
    (aDrawingCritical && !aMetrics.mCriticalDisplayPort.IsEmpty()) ?
      aMetrics.mCriticalDisplayPort : aMetrics.mDisplayPort;
  LayerRect displayPort = (metricsDisplayPort + aMetrics.GetScrollOffset()) * paintScale;

  ScreenPoint scrollOffset;
  CSSToScreenScale zoom;
  bool ret = AndroidBridge::Bridge()->ProgressiveUpdateCallback(
    aHasPendingNewThebesContent, displayPort, paintScale.scale, aDrawingCritical,
    scrollOffset, zoom);
  aMetrics.SetScrollOffset(scrollOffset / zoom);
  aMetrics.SetZoom(zoom);
  return ret;
#else
  return false;
#endif
}
Example #6
0
FrameMetrics::ViewID
CompositorChild::SharedFrameMetricsData::GetViewID()
{
  FrameMetrics* frame = static_cast<FrameMetrics*>(mBuffer->memory());
  MOZ_ASSERT(frame);
  // Not locking to read of mScrollId since it should not change after being
  // initially set.
  return frame->GetScrollId();
}
Example #7
0
void
APZCCallbackHelper::UpdateCallbackTransform(const FrameMetrics& aApzcMetrics, const FrameMetrics& aActualMetrics)
{
    nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(aApzcMetrics.GetScrollId());
    if (!content) {
        return;
    }
    CSSPoint scrollDelta = aApzcMetrics.GetScrollOffset() - aActualMetrics.GetScrollOffset();
    content->SetProperty(nsGkAtoms::apzCallbackTransform, new CSSPoint(scrollDelta),
                         nsINode::DeleteProperty<CSSPoint>);
}
void
ChromeProcessController::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
{
  MOZ_ASSERT(IsRepaintThread());

  FrameMetrics metrics = aFrameMetrics;
  if (metrics.IsRootContent()) {
    APZCCallbackHelper::UpdateRootFrame(metrics);
  } else {
    APZCCallbackHelper::UpdateSubFrame(metrics);
  }
}
// Recursively create a new array of scrollables, preserving any scrollables
// that are still in the layer tree.
//
// aXScale and aYScale are used to calculate any values that need to be in
// chrome-document CSS pixels and aren't part of the rendering loop, such as
// the initial scroll offset for a new view.
static void
BuildViewMap(ViewMap& oldContentViews, ViewMap& newContentViews,
             nsFrameLoader* aFrameLoader, Layer* aLayer,
             float aXScale = 1, float aYScale = 1)
{
  ContainerLayer* container = aLayer->AsContainerLayer();
  if (!container)
    return;
  const FrameMetrics metrics = container->GetFrameMetrics();
  const ViewID scrollId = metrics.mScrollId;
  const gfx3DMatrix transform = aLayer->GetTransform();
  aXScale *= GetXScale(transform);
  aYScale *= GetYScale(transform);

  if (metrics.IsScrollable()) {
    nscoord auPerDevPixel = aFrameLoader->GetPrimaryFrameOfOwningContent()
                                        ->PresContext()->AppUnitsPerDevPixel();
    nsContentView* view = FindViewForId(oldContentViews, scrollId);
    if (view) {
      // View already exists. Be sure to propagate scales for any values
      // that need to be calculated something in chrome-doc CSS pixels.
      ViewConfig config = view->GetViewConfig();
      aXScale *= config.mXScale;
      aYScale *= config.mYScale;
      view->mFrameLoader = aFrameLoader;
    } else {
      // View doesn't exist, so generate one. We start the view scroll offset at
      // the same position as the framemetric's scroll offset from the layer.
      // The default scale is 1, so no need to propagate scale down.
      ViewConfig config;
      config.mScrollOffset = nsPoint(
        NSIntPixelsToAppUnits(metrics.mViewportScrollOffset.x, auPerDevPixel) * aXScale,
        NSIntPixelsToAppUnits(metrics.mViewportScrollOffset.y, auPerDevPixel) * aYScale);
      view = new nsContentView(aFrameLoader, scrollId, config);
    }

    view->mViewportSize = nsSize(
      NSIntPixelsToAppUnits(metrics.mViewport.width, auPerDevPixel) * aXScale,
      NSIntPixelsToAppUnits(metrics.mViewport.height, auPerDevPixel) * aYScale);
    view->mContentSize = nsSize(
      NSIntPixelsToAppUnits(metrics.mContentSize.width, auPerDevPixel) * aXScale,
      NSIntPixelsToAppUnits(metrics.mContentSize.height, auPerDevPixel) * aYScale);

    newContentViews[scrollId] = view;
  }

  for (Layer* child = aLayer->GetFirstChild();
       child; child = child->GetNextSibling()) {
    BuildViewMap(oldContentViews, newContentViews, aFrameLoader, child,
                 aXScale, aYScale);
  }
}
Example #10
0
/**
 * Scroll the scroll frame associated with |aContent| to the scroll position
 * requested in |aMetrics|.
 * The scroll offset in |aMetrics| is updated to reflect the actual scroll
 * position.
 * The displayport stored in |aMetrics| and the callback-transform stored on
 * the content are updated to reflect any difference between the requested
 * and actual scroll positions.
 */
static void
ScrollFrame(nsIContent* aContent,
            FrameMetrics& aMetrics)
{
  // Scroll the window to the desired spot
  nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.GetScrollId());
  if (sf) {
    sf->SetScrollableByAPZ(!aMetrics.IsScrollInfoLayer());
  }

  bool scrollUpdated = false;
  CSSPoint apzScrollOffset = aMetrics.GetScrollOffset();
  CSSPoint actualScrollOffset = ScrollFrameTo(sf, apzScrollOffset, scrollUpdated);

  if (scrollUpdated) {
    if (aMetrics.IsScrollInfoLayer()) {
      // In cases where the APZ scroll offset is different from the content scroll
      // offset, we want to interpret the margins as relative to the APZ scroll
      // offset except when the frame is not scrollable by APZ. Therefore, if the
      // layer is a scroll info layer, we leave the margins as-is and they will
      // be interpreted as relative to the content scroll offset.
      if (nsIFrame* frame = aContent->GetPrimaryFrame()) {
        frame->SchedulePaint();
      }
    } else {
      // Correct the display port due to the difference between mScrollOffset and the
      // actual scroll offset.
      APZCCallbackHelper::AdjustDisplayPortForScrollDelta(aMetrics, actualScrollOffset);
    }
  } else {
    // For whatever reason we couldn't update the scroll offset on the scroll frame,
    // which means the data APZ used for its displayport calculation is stale. Fall
    // back to a sane default behaviour. Note that we don't tile-align the recentered
    // displayport because tile-alignment depends on the scroll position, and the
    // scroll position here is out of our control. See bug 966507 comment 21 for a
    // more detailed explanation.
    RecenterDisplayPort(aMetrics);
  }

  aMetrics.SetScrollOffset(actualScrollOffset);

  // APZ transforms inputs assuming we applied the exact scroll offset it
  // requested (|apzScrollOffset|). Since we may not have, record the difference
  // between what APZ asked for and what we actually applied, and apply it to
  // input events to compensate.
  if (aContent) {
    CSSPoint scrollDelta = apzScrollOffset - actualScrollOffset;
    aContent->SetProperty(nsGkAtoms::apzCallbackTransform, new CSSPoint(scrollDelta),
                          nsINode::DeleteProperty<CSSPoint>);
  }
}
void
APZCCallbackHelper::UpdateRootFrame(FrameMetrics& aMetrics)
{
  if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
    return;
  }
  nsIContent* content = nsLayoutUtils::FindContentFor(aMetrics.GetScrollId());
  if (!content) {
    return;
  }

  nsCOMPtr<nsIPresShell> shell = GetPresShell(content);
  if (!shell || aMetrics.GetPresShellId() != shell->GetPresShellId()) {
    return;
  }

  MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());

  if (gfxPrefs::APZAllowZooming()) {
    // If zooming is disabled then we don't really want to let APZ fiddle
    // with these things. In theory setting the resolution here should be a
    // no-op, but setting the SPCSPS is bad because it can cause a stale value
    // to be returned by window.innerWidth/innerHeight (see bug 1187792).

    float presShellResolution = nsLayoutUtils::GetResolution(shell);

    // If the pres shell resolution has changed on the content side side
    // the time this repaint request was fired, consider this request out of date
    // and drop it; setting a zoom based on the out-of-date resolution can have
    // the effect of getting us stuck with the stale resolution.
    if (presShellResolution != aMetrics.GetPresShellResolution()) {
      return;
    }

    // Set the scroll port size, which determines the scroll range. For example if
    // a 500-pixel document is shown in a 100-pixel frame, the scroll port length would
    // be 100, and gecko would limit the maximum scroll offset to 400 (so as to prevent
    // overscroll). Note that if the content here was zoomed to 2x, the document would
    // be 1000 pixels long but the frame would still be 100 pixels, and so the maximum
    // scroll range would be 900. Therefore this calculation depends on the zoom applied
    // to the content relative to the container.
    // Note that this needs to happen before scrolling the frame (in UpdateFrameCommon),
    // otherwise the scroll position may get clamped incorrectly.
    CSSSize scrollPort = aMetrics.CalculateCompositedSizeInCssPixels();
    nsLayoutUtils::SetScrollPositionClampingScrollPortSize(shell, scrollPort);

    // The pres shell resolution is updated by the the async zoom since the
    // last paint.
    presShellResolution = aMetrics.GetPresShellResolution()
                        * aMetrics.GetAsyncZoom().scale;
    nsLayoutUtils::SetResolutionAndScaleTo(shell, presShellResolution);
  }

  // Do this as late as possible since scrolling can flush layout. It also
  // adjusts the display port margins, so do it before we set those.
  ScrollFrame(content, aMetrics);

  SetDisplayPortMargins(shell, content, aMetrics);
}
void
ChromeProcessController::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (aFrameMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
    return;
  }

  nsCOMPtr<nsIContent> targetContent = nsLayoutUtils::FindContentFor(aFrameMetrics.GetScrollId());
  if (targetContent) {
    FrameMetrics metrics = aFrameMetrics;
    APZCCallbackHelper::UpdateSubFrame(targetContent, metrics);
  }
}
Example #13
0
bool
GenericScrollAnimation::DoSample(FrameMetrics& aFrameMetrics, const TimeDuration& aDelta)
{
  TimeStamp now = mApzc.GetFrameTime();
  CSSToParentLayerScale2D zoom = aFrameMetrics.GetZoom();

  // If the animation is finished, make sure the final position is correct by
  // using one last displacement. Otherwise, compute the delta via the timing
  // function as normal.
  bool finished = mAnimationPhysics->IsFinished(now);
  nsPoint sampledDest = mAnimationPhysics->PositionAt(now);
  ParentLayerPoint displacement =
    (CSSPoint::FromAppUnits(sampledDest) - aFrameMetrics.GetScrollOffset()) * zoom;

  if (finished) {
    mApzc.mX.SetVelocity(0);
    mApzc.mY.SetVelocity(0);
  } else if (!IsZero(displacement)) {
    // Convert velocity from AppUnits/Seconds to ParentLayerCoords/Milliseconds
    nsSize velocity = mAnimationPhysics->VelocityAt(now);
    ParentLayerPoint velocityPL =
      CSSPoint::FromAppUnits(nsPoint(velocity.width, velocity.height)) * zoom;
    mApzc.mX.SetVelocity(velocityPL.x / 1000.0);
    mApzc.mY.SetVelocity(velocityPL.y / 1000.0);
  }

  // Note: we ignore overscroll for generic animations.
  ParentLayerPoint adjustedOffset, overscroll;
  mApzc.mX.AdjustDisplacement(displacement.x, adjustedOffset.x, overscroll.x,
                              mDirectionForcedToOverscroll
                                == Some(ScrollDirection::eHorizontal));
  mApzc.mY.AdjustDisplacement(displacement.y, adjustedOffset.y, overscroll.y,
                              mDirectionForcedToOverscroll
                                == Some(ScrollDirection::eVertical));

  // If we expected to scroll, but there's no more scroll range on either axis,
  // then end the animation early. Note that the initial displacement could be 0
  // if the compositor ran very quickly (<1ms) after the animation was created.
  // When that happens we want to make sure the animation continues.
  if (!IsZero(displacement) && IsZero(adjustedOffset)) {
    // Nothing more to do - end the animation.
    return false;
  }

  aFrameMetrics.ScrollBy(adjustedOffset / zoom);
  return !finished;
}
Example #14
0
TEST_F(APZCPinchTester, Panning_TwoFinger_ZoomDisabled) {
  // set up APZ
  apzc->SetFrameMetrics(GetPinchableFrameMetrics());
  MakeApzcUnzoomable();

  nsEventStatus statuses[3];  // scalebegin, scale, scaleend
  PinchWithPinchInput(apzc, 250, 350, 200, 300, 10, &statuses);

  FrameMetrics fm = apzc->GetFrameMetrics();

  // It starts from (300, 300), then moves the focus point from (250, 350) to
  // (200, 300) pans by (50, 50) screen pixels, but there is a 2x zoom, which
  // causes the scroll offset to change by half of that (25, 25) pixels.
  EXPECT_EQ(325, fm.GetScrollOffset().x);
  EXPECT_EQ(325, fm.GetScrollOffset().y);
  EXPECT_EQ(2.0, fm.GetZoom().ToScaleFactor().scale);
}
static void
SetDisplayPortMargins(nsIPresShell* aPresShell,
                      nsIContent* aContent,
                      const FrameMetrics& aMetrics)
{
  if (!aContent) {
    return;
  }

  ScreenMargin margins = aMetrics.GetDisplayPortMargins();
  nsLayoutUtils::SetDisplayPortMargins(aContent, aPresShell, margins, 0);
  CSSRect baseCSS = aMetrics.CalculateCompositedRectInCssPixels();
  nsRect base(0, 0,
              baseCSS.width * nsPresContext::AppUnitsPerCSSPixel(),
              baseCSS.height * nsPresContext::AppUnitsPerCSSPixel());
  nsLayoutUtils::SetDisplayPortBaseIfNotSet(aContent, base);
}
bool
GenericScrollAnimation::DoSample(FrameMetrics& aFrameMetrics, const TimeDuration& aDelta)
{
  TimeStamp now = mApzc.GetFrameTime();
  CSSToParentLayerScale2D zoom = aFrameMetrics.GetZoom();

  // If the animation is finished, make sure the final position is correct by
  // using one last displacement. Otherwise, compute the delta via the timing
  // function as normal.
  bool finished = IsFinished(now);
  nsPoint sampledDest = finished
                        ? mDestination
                        : PositionAt(now);
  ParentLayerPoint displacement =
    (CSSPoint::FromAppUnits(sampledDest) - aFrameMetrics.GetScrollOffset()) * zoom;

  if (finished) {
    mApzc.mX.SetVelocity(0);
    mApzc.mY.SetVelocity(0);
  } else if (!IsZero(displacement)) {
    // Velocity is measured in ParentLayerCoords / Milliseconds
    float xVelocity = displacement.x / aDelta.ToMilliseconds();
    float yVelocity = displacement.y / aDelta.ToMilliseconds();
    mApzc.mX.SetVelocity(xVelocity);
    mApzc.mY.SetVelocity(yVelocity);
  }

  // Note: we ignore overscroll for generic animations.
  ParentLayerPoint adjustedOffset, overscroll;
  mApzc.mX.AdjustDisplacement(displacement.x, adjustedOffset.x, overscroll.x);
  mApzc.mY.AdjustDisplacement(displacement.y, adjustedOffset.y, overscroll.y,
                              mForceVerticalOverscroll);

  // If we expected to scroll, but there's no more scroll range on either axis,
  // then end the animation early. Note that the initial displacement could be 0
  // if the compositor ran very quickly (<1ms) after the animation was created.
  // When that happens we want to make sure the animation continues.
  if (!IsZero(displacement) && IsZero(adjustedOffset)) {
    // Nothing more to do - end the animation.
    return false;
  }

  aFrameMetrics.ScrollBy(adjustedOffset / zoom);
  return !finished;
}
Example #17
0
bool
APZCCallbackHelper::HasValidPresShellId(nsIDOMWindowUtils* aUtils,
                                        const FrameMetrics& aMetrics)
{
    MOZ_ASSERT(aUtils);

    uint32_t presShellId;
    nsresult rv = aUtils->GetPresShellId(&presShellId);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    return NS_SUCCEEDED(rv) && aMetrics.GetPresShellId() == presShellId;
}
void
APZCCallbackHelper::UpdateSubFrame(FrameMetrics& aMetrics)
{
  if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
    return;
  }
  nsIContent* content = nsLayoutUtils::FindContentFor(aMetrics.GetScrollId());
  if (!content) {
    return;
  }

  MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());

  // We don't currently support zooming for subframes, so nothing extra
  // needs to be done beyond the tasks common to this and UpdateRootFrame.
  ScrollFrame(content, aMetrics);
  if (nsCOMPtr<nsIPresShell> shell = GetPresShell(content)) {
    SetDisplayPortMargins(shell, content, aMetrics);
  }
}
Example #19
0
void
APZCCallbackHelper::UpdateRootFrame(nsIDOMWindowUtils* aUtils,
                                    FrameMetrics& aMetrics)
{
  // Precondition checks
  MOZ_ASSERT(aUtils);
  MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());
  if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
    return;
  }

  // Set the scroll port size, which determines the scroll range. For example if
  // a 500-pixel document is shown in a 100-pixel frame, the scroll port length would
  // be 100, and gecko would limit the maximum scroll offset to 400 (so as to prevent
  // overscroll). Note that if the content here was zoomed to 2x, the document would
  // be 1000 pixels long but the frame would still be 100 pixels, and so the maximum
  // scroll range would be 900. Therefore this calculation depends on the zoom applied
  // to the content relative to the container.
  // Note that this needs to happen before scrolling the frame (in UpdateFrameCommon),
  // otherwise the scroll position may get clamped incorrectly.
  CSSSize scrollPort = aMetrics.CalculateCompositedSizeInCssPixels();
  aUtils->SetScrollPositionClampingScrollPortSize(scrollPort.width, scrollPort.height);

  nsIContent* content = nsLayoutUtils::FindContentFor(aMetrics.GetScrollId());
  ScrollFrame(content, aMetrics);

  // The pres shell resolution is updated by the the async zoom since the
  // last paint.
  float presShellResolution = aMetrics.GetPresShellResolution()
                            * aMetrics.GetAsyncZoom().scale;
  aUtils->SetResolutionAndScaleTo(presShellResolution, presShellResolution);

  SetDisplayPortMargins(aUtils, content, aMetrics);
}
bool
ClientTiledPaintedLayer::IsScrollingOnCompositor(const FrameMetrics& aParentMetrics)
{
  CompositorChild* compositor = nullptr;
  if (Manager() && Manager()->AsClientLayerManager()) {
    compositor = Manager()->AsClientLayerManager()->GetCompositorChild();
  }

  if (!compositor) {
    return false;
  }

  FrameMetrics compositorMetrics;
  if (!compositor->LookupCompositorFrameMetrics(aParentMetrics.GetScrollId(),
                                                compositorMetrics)) {
    return false;
  }

  // 1 is a tad high for a fuzzy equals epsilon however if our scroll delta
  // is so small then we have nothing to gain from using paint heuristics.
  float COORDINATE_EPSILON = 1.f;

  return !FuzzyEqualsAdditive(compositorMetrics.GetScrollOffset().x,
                              aParentMetrics.GetScrollOffset().x,
                              COORDINATE_EPSILON) ||
         !FuzzyEqualsAdditive(compositorMetrics.GetScrollOffset().y,
                              aParentMetrics.GetScrollOffset().y,
                              COORDINATE_EPSILON);
}
void
APZCCallbackHandler::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
{
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aFrameMetrics.GetScrollId() != FrameMetrics::NULL_SCROLL_ID);

    if (aFrameMetrics.GetIsRoot()) {
        nsIDOMWindowUtils* utils = GetDOMWindowUtils();
        if (utils && APZCCallbackHelper::HasValidPresShellId(utils, aFrameMetrics)) {
            FrameMetrics metrics = aFrameMetrics;
            APZCCallbackHelper::UpdateRootFrame(utils, metrics);
        }
    } else {
        // aFrameMetrics.mIsRoot is false, so we are trying to update a subframe.
        // This requires special handling.
        nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(aFrameMetrics.GetScrollId());
        if (content) {
            FrameMetrics newSubFrameMetrics(aFrameMetrics);
            APZCCallbackHelper::UpdateSubFrame(content, newSubFrameMetrics);
        }
    }
}
Example #22
0
void
APZCCallbackHelper::UpdateRootFrame(FrameMetrics& aMetrics)
{
  if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
    return;
  }
  nsIContent* content = nsLayoutUtils::FindContentFor(aMetrics.GetScrollId());
  if (!content) {
    return;
  }

  nsCOMPtr<nsIPresShell> shell = GetPresShell(content);
  if (!shell || aMetrics.GetPresShellId() != shell->GetPresShellId()) {
    return;
  }

  MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());

  if (gfxPrefs::APZAllowZooming()) {
    // If zooming is disabled then we don't really want to let APZ fiddle
    // with these things. In theory setting the resolution here should be a
    // no-op, but setting the SPCSPS is bad because it can cause a stale value
    // to be returned by window.innerWidth/innerHeight (see bug 1187792).

    float presShellResolution = shell->GetResolution();

    // If the pres shell resolution has changed on the content side side
    // the time this repaint request was fired, consider this request out of date
    // and drop it; setting a zoom based on the out-of-date resolution can have
    // the effect of getting us stuck with the stale resolution.
    if (presShellResolution != aMetrics.GetPresShellResolution()) {
      return;
    }

    // The pres shell resolution is updated by the the async zoom since the
    // last paint.
    presShellResolution = aMetrics.GetPresShellResolution()
                        * aMetrics.GetAsyncZoom().scale;
    shell->SetResolutionAndScaleTo(presShellResolution);
  }

  // Do this as late as possible since scrolling can flush layout. It also
  // adjusts the display port margins, so do it before we set those.
  ScrollFrame(content, aMetrics);

  MOZ_ASSERT(nsLayoutUtils::HasDisplayPort(content));
  SetDisplayPortMargins(shell, content, aMetrics);
  SetPaintRequestTime(content, aMetrics.GetPaintRequestTime());
}
bool AsyncPanZoomController::SampleContentTransformForFrame(const TimeStamp& aSampleTime,
                                                            const FrameMetrics& aFrame,
                                                            const gfx3DMatrix& aCurrentTransform,
                                                            gfx3DMatrix* aNewTransform) {
  // The eventual return value of this function. The compositor needs to know
  // whether or not to advance by a frame as soon as it can. For example, if a
  // fling is happening, it has to keep compositing so that the animation is
  // smooth. If an animation frame is requested, it is the compositor's
  // responsibility to schedule a composite.
  bool requestAnimationFrame = false;

  // Scales on the root layer, on what's currently painted.
  float rootScaleX = aCurrentTransform.GetXScale(),
        rootScaleY = aCurrentTransform.GetYScale();

  nsIntPoint metricsScrollOffset(0, 0);
  nsIntPoint scrollOffset;
  float localScaleX, localScaleY;

  {
    MonitorAutoLock mon(mMonitor);

    // If a fling is currently happening, apply it now. We can pull the updated
    // metrics afterwards.
    requestAnimationFrame = requestAnimationFrame || DoFling(aSampleTime - mLastSampleTime);

    // Current local transform; this is not what's painted but rather what PZC has
    // transformed due to touches like panning or pinching. Eventually, the root
    // layer transform will become this during runtime, but we must wait for Gecko
    // to repaint.
    localScaleX = mFrameMetrics.mResolution.width;
    localScaleY = mFrameMetrics.mResolution.height;

    if (aFrame.IsScrollable()) {
      metricsScrollOffset = aFrame.mViewportScrollOffset;
    }

    scrollOffset = mFrameMetrics.mViewportScrollOffset;
  }

  nsIntPoint scrollCompensation(
    (scrollOffset.x / rootScaleX - metricsScrollOffset.x) * localScaleX,
    (scrollOffset.y / rootScaleY - metricsScrollOffset.y) * localScaleY);

  ViewTransform treeTransform(-scrollCompensation, localScaleX, localScaleY);
  *aNewTransform = gfx3DMatrix(treeTransform) * aCurrentTransform;

  mLastSampleTime = aSampleTime;

  return requestAnimationFrame;
}
Example #24
0
// APZC sends us this request when we need to update the display port on
// the scrollable frame the apzc is managing.
void
APZController::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
{
#ifdef DEBUG_CONTROLLER
  WinUtils::Log("APZController::RequestContentRepaint scrollid=%I64d",
    aFrameMetrics.GetScrollId());
#endif

  // This must be on the gecko thread since we access the dom
  MOZ_ASSERT(NS_IsMainThread());

#ifdef DEBUG_CONTROLLER
  WinUtils::Log("APZController: mScrollOffset: %f %f", aFrameMetrics.mScrollOffset.x,
    aFrameMetrics.mScrollOffset.y);
#endif

  nsCOMPtr<nsIDocument> subDocument;
  nsCOMPtr<nsIContent> targetContent;
  if (!GetDOMTargets(aFrameMetrics.GetScrollId(),
                     subDocument, targetContent)) {
    return;
  }

  // If we're dealing with a sub frame or content editable element,
  // call UpdateSubFrame.
  if (targetContent) {
#ifdef DEBUG_CONTROLLER
    WinUtils::Log("APZController: detected subframe or content editable");
#endif
    FrameMetrics metrics = aFrameMetrics;
    mozilla::layers::APZCCallbackHelper::UpdateSubFrame(targetContent, metrics);
    return;
  }

#ifdef DEBUG_CONTROLLER
  WinUtils::Log("APZController: detected tab");
#endif

  // We're dealing with a tab, call UpdateRootFrame.
  nsCOMPtr<nsIDOMWindowUtils> utils;
  nsCOMPtr<nsIDOMWindow> window = subDocument->GetDefaultView();
  if (window) {
    utils = do_GetInterface(window);
    if (utils) {
      FrameMetrics metrics = aFrameMetrics;
      mozilla::layers::APZCCallbackHelper::UpdateRootFrame(utils, metrics);

#ifdef DEBUG_CONTROLLER
      WinUtils::Log("APZController: %I64d mDisplayPortMargins: %0.2f %0.2f %0.2f %0.2f",
        metrics.GetScrollId(),
        metrics.GetDisplayPortMargins().left,
        metrics.GetDisplayPortMargins().top,
        metrics.GetDisplayPortMargins().right,
        metrics.GetDisplayPortMargins().bottom);
#endif
    }
  }
}
static void PrintUniformityInfo(Layer* aLayer)
{

  if(Layer::TYPE_CONTAINER != aLayer->GetType()) {
    return;
  }

  // Don't want to print a log for smaller layers
  if (aLayer->GetEffectiveVisibleRegion().GetBounds().width < 300 ||
      aLayer->GetEffectiveVisibleRegion().GetBounds().height < 300) {
    return;
  }

  FrameMetrics frameMetrics = aLayer->AsContainerLayer()->GetFrameMetrics();
  LayerIntPoint scrollOffset = RoundedToInt(frameMetrics.GetScrollOffsetInLayerPixels());
  const gfx::Point layerTransform = GetScrollData(aLayer);
  gfx::Point layerScroll;
  layerScroll.x = scrollOffset.x - layerTransform.x;
  layerScroll.y = scrollOffset.y - layerTransform.y;

  printf_stderr("UniformityInfo Layer_Move %llu %p %f, %f\n",
    TimeStamp::Now(), aLayer, layerScroll.x, layerScroll.y);
}
static void
SetDisplayPortMargins(nsIPresShell* aPresShell,
                      nsIContent* aContent,
                      const FrameMetrics& aMetrics)
{
  if (!aContent) {
    return;
  }

  bool hadDisplayPort = nsLayoutUtils::HasDisplayPort(aContent);
  ScreenMargin margins = aMetrics.GetDisplayPortMargins();
  nsLayoutUtils::SetDisplayPortMargins(aContent, aPresShell, margins, 0);
  if (!hadDisplayPort) {
    nsLayoutUtils::SetZeroMarginDisplayPortOnAsyncScrollableAncestors(
        aContent->GetPrimaryFrame(), nsLayoutUtils::RepaintMode::Repaint);
  }

  CSSRect baseCSS = aMetrics.CalculateCompositedRectInCssPixels();
  nsRect base(0, 0,
              baseCSS.width * nsPresContext::AppUnitsPerCSSPixel(),
              baseCSS.height * nsPresContext::AppUnitsPerCSSPixel());
  nsLayoutUtils::SetDisplayPortBaseIfNotSet(aContent, base);
}
Example #27
0
void
APZCCallbackHelper::UpdateSubFrame(nsIContent* aContent,
                                   FrameMetrics& aMetrics)
{
    // Precondition checks
    MOZ_ASSERT(aContent);
    MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());
    if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
        return;
    }

    nsCOMPtr<nsIDOMWindowUtils> utils = GetDOMWindowUtils(aContent);
    if (!utils) {
        return;
    }

    // We currently do not support zooming arbitrary subframes. They can only
    // be scrolled, so here we only have to set the scroll position and displayport.

    nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.GetScrollId());
    bool scrollUpdated = false;
    CSSPoint actualScrollOffset = ScrollFrameTo(sf, aMetrics.GetScrollOffset(), scrollUpdated);

    nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aContent);
    if (element) {
        if (scrollUpdated) {
            AdjustDisplayPortForScrollDelta(aMetrics, actualScrollOffset);
        } else {
            RecenterDisplayPort(aMetrics);
        }
        gfx::IntSize alignment = gfxPrefs::LayersTilesEnabled()
            ? gfx::IntSize(gfxPrefs::LayersTileWidth(), gfxPrefs::LayersTileHeight()) :
              gfx::IntSize(0, 0);
        LayerMargin margins = aMetrics.GetDisplayPortMargins();
        utils->SetDisplayPortMarginsForElement(margins.left,
                                               margins.top,
                                               margins.right,
                                               margins.bottom,
                                               alignment.width,
                                               alignment.height,
                                               element, 0);
        CSSRect baseCSS = aMetrics.CalculateCompositedRectInCssPixels();
        nsRect base(baseCSS.x * nsPresContext::AppUnitsPerCSSPixel(),
                    baseCSS.y * nsPresContext::AppUnitsPerCSSPixel(),
                    baseCSS.width * nsPresContext::AppUnitsPerCSSPixel(),
                    baseCSS.height * nsPresContext::AppUnitsPerCSSPixel());
        nsLayoutUtils::SetDisplayPortBaseIfNotSet(aContent, base);
    }

    aMetrics.SetScrollOffset(actualScrollOffset);
}
void
APZCCallbackHelper::UpdateSubFrame(nsIContent* aContent,
                                   FrameMetrics& aMetrics)
{
  // Precondition checks
  MOZ_ASSERT(aContent);
  MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());

  // We don't currently support zooming for subframes, so nothing extra
  // needs to be done beyond the tasks common to this and UpdateRootFrame.
  ScrollFrame(aContent, aMetrics);
  if (nsCOMPtr<nsIPresShell> shell = GetPresShell(aContent)) {
    SetDisplayPortMargins(shell, aContent, aMetrics);
  }
}
/**
 * Scroll the scroll frame associated with |aContent| to the scroll position
 * requested in |aMetrics|.
 * The scroll offset in |aMetrics| is updated to reflect the actual scroll
 * position.
 * The displayport stored in |aMetrics| and the callback-transform stored on
 * the content are updated to reflect any difference between the requested
 * and actual scroll positions.
 */
static void
ScrollFrame(nsIContent* aContent,
            FrameMetrics& aMetrics)
{
  // Scroll the window to the desired spot
  nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.GetScrollId());
  bool scrollUpdated = false;
  CSSPoint apzScrollOffset = aMetrics.GetScrollOffset();
  CSSPoint actualScrollOffset = ScrollFrameTo(sf, apzScrollOffset, scrollUpdated);

  if (scrollUpdated) {
    // Correct the display port due to the difference between mScrollOffset and the
    // actual scroll offset.
    AdjustDisplayPortForScrollDelta(aMetrics, actualScrollOffset);
  } else {
    // For whatever reason we couldn't update the scroll offset on the scroll frame,
    // which means the data APZ used for its displayport calculation is stale. Fall
    // back to a sane default behaviour. Note that we don't tile-align the recentered
    // displayport because tile-alignment depends on the scroll position, and the
    // scroll position here is out of our control. See bug 966507 comment 21 for a
    // more detailed explanation.
    RecenterDisplayPort(aMetrics);
  }

  aMetrics.SetScrollOffset(actualScrollOffset);

  // APZ transforms inputs assuming we applied the exact scroll offset it
  // requested (|apzScrollOffset|). Since we may not have, record the difference
  // between what APZ asked for and what we actually applied, and apply it to
  // input events to compensate.
  if (aContent) {
    CSSPoint scrollDelta = apzScrollOffset - actualScrollOffset;
    aContent->SetProperty(nsGkAtoms::apzCallbackTransform, new CSSPoint(scrollDelta),
                          nsINode::DeleteProperty<CSSPoint>);
  }
}
Example #30
0
void AsyncPanZoomController::GetContentTransformForFrame(const FrameMetrics& aFrame,
                                                         const gfx3DMatrix& aRootTransform,
                                                         const gfxSize& aWidgetSize,
                                                         gfx3DMatrix* aTreeTransform,
                                                         gfxPoint* aReverseViewTranslation) {
  // Scales on the root layer, on what's currently painted.
  float rootScaleX = aRootTransform.GetXScale(),
        rootScaleY = aRootTransform.GetYScale();

  // Current local transform; this is not what's painted but rather what PZC has
  // transformed due to touches like panning or pinching. Eventually, the root
  // layer transform will become this during runtime, but we must wait for Gecko
  // to repaint.
  float localScaleX = mFrameMetrics.mResolution.width,
        localScaleY = mFrameMetrics.mResolution.height;

  // 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 desired zoom and scroll
  // offset in the view transform we obtained from Java in order to compute the
  // transformation we need to apply.
  float tempScaleDiffX = rootScaleX * localScaleX;
  float tempScaleDiffY = rootScaleY * localScaleY;

  nsIntPoint metricsScrollOffset(0, 0);
  if (aFrame.IsScrollable())
    metricsScrollOffset = aFrame.mViewportScrollOffset;

  nsIntPoint scrollCompensation(
    mFrameMetrics.mViewportScrollOffset.x / rootScaleX - metricsScrollOffset.x,
    mFrameMetrics.mViewportScrollOffset.y / rootScaleY - metricsScrollOffset.y);

  ViewTransform treeTransform(-scrollCompensation, localScaleX, localScaleY);
  *aTreeTransform = gfx3DMatrix(treeTransform);

  float offsetX = mFrameMetrics.mViewportScrollOffset.x / tempScaleDiffX,
        offsetY = mFrameMetrics.mViewportScrollOffset.y / tempScaleDiffY;

  nsIntRect localContentRect = mFrameMetrics.mContentRect;
  offsetX = NS_MAX((float)localContentRect.x,
                   NS_MIN(offsetX, (float)(localContentRect.XMost() - aWidgetSize.width)));
  offsetY = NS_MAX((float)localContentRect.y,
                    NS_MIN(offsetY, (float)(localContentRect.YMost() - aWidgetSize.height)));
  *aReverseViewTranslation = gfxPoint(offsetX - metricsScrollOffset.x,
                                      offsetY - metricsScrollOffset.y);
}