зеркало из https://github.com/mozilla/gecko-dev.git
Bug 605618 Part 6: Use viewports to allow scrolling and build display lists r=cjones r=tn
This commit is contained in:
Benjamin Stover
Родитель
391da32464
Коммит
3393651205
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@ -181,6 +181,11 @@ public:
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nsFrameLoader::Destroy();
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}
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PRBool AsyncScrollEnabled() const
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{
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return !!(mRenderMode & RENDER_MODE_ASYNC_SCROLL);
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}
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static nsFrameLoader* Create(nsIContent* aOwner, PRBool aNetworkCreated);
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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@ -58,6 +58,64 @@ namespace layout {
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typedef FrameMetrics::ViewID ViewID;
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typedef RenderFrameParent::ViewMap ViewMap;
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// Represents (affine) transforms that are calculated from a content view.
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struct ViewTransform {
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ViewTransform(nsIntPoint aTranslation, float aXScale, float aYScale)
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: mTranslation(aTranslation)
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, mXScale(aXScale)
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, mYScale(aYScale)
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{}
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operator gfx3DMatrix() const
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{
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return
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gfx3DMatrix::Scale(mXScale, mYScale, 1) *
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gfx3DMatrix::Translation(mTranslation.x, mTranslation.y, 0);
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}
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nsIntPoint mTranslation;
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float mXScale;
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float mYScale;
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};
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// Matrix helpers
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// For our simple purposes, these helpers apply to 2D affine transformations
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// that can be represented by a scale and a translation. This makes the math
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// much easier because we only expect the diagonals and the translation
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// coordinates of the matrix to be non-zero.
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static double GetXScale(const gfx3DMatrix& aTransform)
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{
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return aTransform._11;
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}
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static double GetYScale(const gfx3DMatrix& aTransform)
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{
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return aTransform._22;
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}
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static void Scale(gfx3DMatrix& aTransform, double aXScale, double aYScale)
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{
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aTransform._11 *= aXScale;
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aTransform._22 *= aYScale;
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}
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static void Translate(gfx3DMatrix& aTransform, nsIntPoint aTranslate)
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{
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aTransform._41 += aTranslate.x;
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aTransform._42 += aTranslate.y;
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}
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static void ApplyTransform(nsRect& aRect,
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gfx3DMatrix& aTransform,
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nscoord auPerDevPixel)
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{
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aRect.x = aRect.x * aTransform._11 + aTransform._41 * auPerDevPixel;
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aRect.y = aRect.y * aTransform._22 + aTransform._42 * auPerDevPixel;
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aRect.width = aRect.width * aTransform._11;
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aRect.height = aRect.height * aTransform._22;
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}
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static void
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AssertInTopLevelChromeDoc(ContainerLayer* aContainer,
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nsIFrame* aContainedFrame)
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@ -88,84 +146,169 @@ AssertValidContainerOfShadowTree(ContainerLayer* aContainer,
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"container of shadow tree may only be null or have 1 child that is the shadow root");
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}
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static const FrameMetrics*
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GetFrameMetrics(Layer* aLayer)
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{
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// Children are not container layers, so they don't have frame metrics. Give
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// them a blank metric.
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if (!aLayer->GetFirstChild())
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return NULL;
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ContainerLayer* container = static_cast<ContainerLayer*>(aLayer);
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return &container->GetFrameMetrics();
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}
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static nsIntPoint
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GetRootFrameOffset(nsIFrame* aContainerFrame, nsDisplayListBuilder* aBuilder)
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{
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nscoord auPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel();
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// Offset to the content rect in case we have borders or padding
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nsPoint frameOffset =
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(aBuilder->ToReferenceFrame(aContainerFrame->GetParent()) +
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aContainerFrame->GetContentRect().TopLeft());
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return frameOffset.ToNearestPixels(auPerDevPixel);
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}
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// Compute the transform of the shadow tree contained by
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// |aContainerFrame| to widget space. We transform because the
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// subprocess layer manager renders to a different top-left than where
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// the shadow tree is drawn here and because a scale can be set on the
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// shadow tree.
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static void
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static ViewTransform
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ComputeShadowTreeTransform(nsIFrame* aContainerFrame,
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const FrameMetrics& aMetrics,
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nsFrameLoader* aRootFrameLoader,
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const FrameMetrics* aMetrics,
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const ViewConfig& aConfig,
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nsDisplayListBuilder* aBuilder,
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nsIntPoint* aShadowTranslation,
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float* aShadowXScale,
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float* aShadowYScale)
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float aInverseScaleX,
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float aInverseScaleY)
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{
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// |aMetrics->mViewportScrollOffset| The frame's scroll offset when it was
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// painted, in content document pixels.
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// |aConfig.mScrollOffset| What our user expects, or wants, the
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// frame scroll offset to be in chrome
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// document app units.
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//
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// So we set a compensating translation that moves the content document
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// pixels to where the user wants them to be.
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//
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nscoord auPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel();
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// Offset to the content rect in case we have borders or padding
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nsPoint frameOffset =
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(aBuilder->ToReferenceFrame(aContainerFrame->GetParent()) +
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aContainerFrame->GetContentRect().TopLeft());
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*aShadowTranslation = frameOffset.ToNearestPixels(auPerDevPixel);
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nsIntPoint scrollOffset =
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aConfig.mScrollOffset.ToNearestPixels(auPerDevPixel);
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nsIntPoint metricsScrollOffset = aMetrics->mViewportScrollOffset;
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if (aConfig.AsyncScrollEnabled()) {
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// |aMetrics.mViewportScrollOffset| was the content document's
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// scroll offset when it was painted (the document pixel at CSS
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// viewport (0,0)). |aConfig.mScrollOffset| is what our user
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// expects, or wants, the content-document scroll offset to be. So
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// we set a compensating translation that moves the content document
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// pixels to where the user wants them to be.
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nsIntPoint scrollCompensation =
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(aConfig.mScrollOffset.ToNearestPixels(auPerDevPixel));
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scrollCompensation.x -= aMetrics.mViewportScrollOffset.x * aConfig.mXScale;
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scrollCompensation.y -= aMetrics.mViewportScrollOffset.y * aConfig.mYScale;
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*aShadowTranslation -= scrollCompensation;
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if (aRootFrameLoader->AsyncScrollEnabled()) {
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nsIntPoint scrollCompensation(
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scrollOffset.x * aInverseScaleX - metricsScrollOffset.x * aConfig.mXScale,
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scrollOffset.y * aInverseScaleY - metricsScrollOffset.y * aConfig.mYScale);
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*aShadowXScale = aConfig.mXScale;
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*aShadowYScale = aConfig.mYScale;
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return ViewTransform(-scrollCompensation, aConfig.mXScale, aConfig.mYScale);
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} else {
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*aShadowXScale = 1;
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*aShadowYScale = 1;
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return ViewTransform(nsIntPoint(0, 0), 1, 1);
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}
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}
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// Use shadow layer tree to build display list for the browser's frame.
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static void
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UpdateShadowSubtree(Layer* aSubtreeRoot)
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BuildListForLayer(Layer* aLayer,
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nsFrameLoader* aRootFrameLoader,
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gfx3DMatrix aTransform,
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nsDisplayListBuilder* aBuilder,
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nsDisplayList& aShadowTree,
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nsIFrame* aSubdocFrame)
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{
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ShadowLayer* shadow = aSubtreeRoot->AsShadowLayer();
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const FrameMetrics* metrics = GetFrameMetrics(aLayer);
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shadow->SetShadowClipRect(aSubtreeRoot->GetClipRect());
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shadow->SetShadowTransform(aSubtreeRoot->GetTransform());
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shadow->SetShadowVisibleRegion(aSubtreeRoot->GetVisibleRegion());
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gfx3DMatrix transform;
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for (Layer* child = aSubtreeRoot->GetFirstChild(); child;
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if (metrics && metrics->IsScrollable()) {
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const ViewID scrollId = metrics->mScrollId;
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// We need to figure out the bounds of the scrollable region using the
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// shadow layer tree from the remote process. The metrics viewport is
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// defined based on all the transformations of its parent layers and
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// the scale of the current layer.
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// Calculate transform for this layer.
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nsContentView* view =
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aRootFrameLoader->GetCurrentRemoteFrame()->GetContentView(scrollId);
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gfx3DMatrix applyTransform = ComputeShadowTreeTransform(
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aSubdocFrame, aRootFrameLoader, metrics, view->GetViewConfig(), aBuilder,
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1 / GetXScale(aTransform), 1 / GetYScale(aTransform));
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transform = applyTransform * aLayer->GetTransform() * aTransform;
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// As mentioned above, bounds calculation also depends on the scale
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// of this layer.
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Scale(aTransform, GetXScale(applyTransform), GetYScale(applyTransform));
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// Calculate rect for this layer based on aTransform.
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nsRect bounds;
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{
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nscoord auPerDevPixel = aSubdocFrame->PresContext()->AppUnitsPerDevPixel();
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bounds = metrics->mViewport.ToAppUnits(auPerDevPixel);
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ApplyTransform(bounds, aTransform, auPerDevPixel);
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}
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aShadowTree.AppendToTop(
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new (aBuilder) nsDisplayRemoteShadow(aBuilder, aSubdocFrame, bounds, scrollId));
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} else {
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transform = aLayer->GetTransform() * aTransform;
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}
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for (Layer* child = aLayer->GetFirstChild(); child;
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child = child->GetNextSibling()) {
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UpdateShadowSubtree(child);
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BuildListForLayer(child, aRootFrameLoader, transform,
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aBuilder, aShadowTree, aSubdocFrame);
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}
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}
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// Go down shadow layer tree and apply transformations for scrollable layers.
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static void
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TransformShadowTreeTo(ContainerLayer* aRoot,
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const nsIntRect& aVisibleRect,
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const nsIntPoint& aTranslation,
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float aXScale, float aYScale)
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TransformShadowTree(nsDisplayListBuilder* aBuilder, nsFrameLoader* aFrameLoader,
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nsIFrame* aFrame, Layer* aLayer,
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float aXScale = 1, float aYScale = 1)
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{
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UpdateShadowSubtree(aRoot);
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ShadowLayer* shadow = aLayer->AsShadowLayer();
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shadow->SetShadowClipRect(aLayer->GetClipRect());
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shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
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ShadowLayer* shadow = aRoot->AsShadowLayer();
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NS_ABORT_IF_FALSE(aRoot->GetTransform() == shadow->GetShadowTransform(),
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"transforms should be the same now");
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NS_ABORT_IF_FALSE(aRoot->GetTransform().Is2D(),
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"only 2D transforms expected currently");
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gfxMatrix shadowTransform;
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shadow->GetShadowTransform().Is2D(&shadowTransform);
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// Pre-multiply this transform into the shadow's transform, so that
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// it occurs before any transform set by the child
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shadowTransform.Translate(gfxPoint(aTranslation.x, aTranslation.y));
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shadowTransform.Scale(aXScale, aYScale);
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shadow->SetShadowTransform(gfx3DMatrix::From2D(shadowTransform));
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const FrameMetrics* metrics = GetFrameMetrics(aLayer);
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gfx3DMatrix shadowTransform;
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if (metrics && metrics->IsScrollable()) {
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const ViewID scrollId = metrics->mScrollId;
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const nsContentView* view =
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aFrameLoader->GetCurrentRemoteFrame()->GetContentView(scrollId);
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NS_ABORT_IF_FALSE(view, "Array of views should be consistent with layer tree");
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ViewTransform viewTransform = ComputeShadowTreeTransform(
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aFrame, aFrameLoader, metrics, view->GetViewConfig(), aBuilder,
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1 / aXScale, 1 / aYScale
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);
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if (metrics->IsRootScrollable()) {
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viewTransform.mTranslation += GetRootFrameOffset(aFrame, aBuilder);
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}
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shadowTransform = gfx3DMatrix(viewTransform) * aLayer->GetTransform();
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} else {
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shadowTransform = aLayer->GetTransform();
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}
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shadow->SetShadowTransform(shadowTransform);
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aXScale *= GetXScale(shadowTransform);
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aYScale *= GetYScale(shadowTransform);
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for (Layer* child = aLayer->GetFirstChild();
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child; child = child->GetNextSibling()) {
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TransformShadowTree(aBuilder, aFrameLoader, aFrame, child, aXScale, aYScale);
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}
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}
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static Layer*
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@ -205,7 +348,7 @@ BuildViewMap(ViewMap& oldContentViews, ViewMap& newContentViews,
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return;
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ContainerLayer* container = static_cast<ContainerLayer*>(aLayer);
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const FrameMetrics& metrics = container->GetFrameMetrics();
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const FrameMetrics metrics = container->GetFrameMetrics();
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const ViewID scrollId = metrics.mScrollId;
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nscoord auPerDevPixel = aFrameLoader->GetPrimaryFrameOfOwningContent()
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@ -234,10 +377,10 @@ BuildViewMap(ViewMap& oldContentViews, ViewMap& newContentViews,
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for (Layer* child = aLayer->GetFirstChild();
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child; child = child->GetNextSibling()) {
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const gfx3DMatrix transform = aLayer->GetTransform();
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aXScale *= transform._11;
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aYScale *= transform._22;
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aXScale *= GetXScale(transform);
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aYScale *= GetYScale(transform);
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BuildViewMap(oldContentViews, newContentViews, aFrameLoader, child,
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aXScale, aYScale);
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aXScale, aYScale);
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}
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}
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@ -359,16 +502,7 @@ RenderFrameParent::BuildLayer(nsDisplayListBuilder* aBuilder,
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if (mContainer) {
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AssertInTopLevelChromeDoc(mContainer, aFrame);
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nsIntPoint shadowTranslation;
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float shadowXScale, shadowYScale;
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ComputeShadowTreeTransform(aFrame,
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shadowRoot->GetFrameMetrics(),
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GetContentView()->GetViewConfig(),
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aBuilder,
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&shadowTranslation,
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&shadowXScale, &shadowYScale);
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TransformShadowTreeTo(shadowRoot, aVisibleRect,
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shadowTranslation, shadowXScale, shadowYScale);
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TransformShadowTree(aBuilder, mFrameLoader, aFrame, shadowRoot);
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mContainer->SetClipRect(nsnull);
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}
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@ -487,8 +621,16 @@ RenderFrameParent::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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// We're the subdoc for <browser remote="true"> and it has
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// painted content. Display its shadow layer tree.
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nsDisplayList shadowTree;
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shadowTree.AppendToTop(
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new (aBuilder) nsDisplayRemote(aBuilder, aFrame, this));
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if (aBuilder->IsForEventDelivery()) {
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nsRect bounds = aFrame->EnsureInnerView()->GetBounds();
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ViewTransform offset =
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ViewTransform(GetRootFrameOffset(aFrame, aBuilder), 1, 1);
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BuildListForLayer(GetRootLayer(), mFrameLoader, offset,
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aBuilder, shadowTree, aFrame);
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} else {
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shadowTree.AppendToTop(
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new (aBuilder) nsDisplayRemote(aBuilder, aFrame, this));
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}
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// Clip the shadow layers to subdoc bounds
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nsPoint offset = aFrame->GetOffsetToCrossDoc(aBuilder->ReferenceFrame());
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