static const FrameMetrics* GetFrameMetrics(Layer* aLayer) { ContainerLayer* container = aLayer->AsContainerLayer(); return container ? &container->GetFrameMetrics() : nullptr; }
void ClientTiledThebesLayer::BeginPaint() { if (ClientManager()->IsRepeatTransaction()) { return; } mPaintData.mLowPrecisionPaintCount = 0; mPaintData.mPaintFinished = false; // Get the metrics of the nearest scroll container. ContainerLayer* scrollParent = nullptr; for (ContainerLayer* parent = GetParent(); parent; parent = parent->GetParent()) { const FrameMetrics& metrics = parent->GetFrameMetrics(); if (metrics.mScrollId != FrameMetrics::NULL_SCROLL_ID) { scrollParent = parent; break; } } if (!scrollParent) { // XXX I don't think this can happen, but if it does, warn and set the // composition bounds to empty so that progressive updates are disabled. NS_WARNING("Tiled Thebes layer with no scrollable container parent"); mPaintData.mCompositionBounds.SetEmpty(); return; } const FrameMetrics& metrics = scrollParent->GetFrameMetrics(); // Calculate the transform required to convert screen space into transformed // layout device space. gfx::Matrix4x4 effectiveTransform = GetEffectiveTransform(); for (ContainerLayer* parent = GetParent(); parent; parent = parent->GetParent()) { if (parent->UseIntermediateSurface()) { effectiveTransform = effectiveTransform * parent->GetEffectiveTransform(); } } gfx3DMatrix layoutToScreen; gfx::To3DMatrix(effectiveTransform, layoutToScreen); layoutToScreen.ScalePost(metrics.mCumulativeResolution.scale, metrics.mCumulativeResolution.scale, 1.f); mPaintData.mTransformScreenToLayout = layoutToScreen.Inverse(); // Compute the critical display port in layer space. mPaintData.mLayoutCriticalDisplayPort.SetEmpty(); if (!metrics.mCriticalDisplayPort.IsEmpty()) { // Convert the display port to screen space first so that we can transform // it into layout device space. const ScreenRect& criticalDisplayPort = metrics.mCriticalDisplayPort * metrics.mZoom; LayoutDeviceRect transformedCriticalDisplayPort = ApplyScreenToLayoutTransform(mPaintData.mTransformScreenToLayout, criticalDisplayPort); mPaintData.mLayoutCriticalDisplayPort = LayoutDeviceIntRect::ToUntyped(RoundedOut(transformedCriticalDisplayPort)); } // Calculate the frame resolution. Because this is Gecko-side, before any // async transforms have occurred, we can use mZoom for this. mPaintData.mResolution = metrics.mZoom; // Calculate the scroll offset since the last transaction, and the // composition bounds. mPaintData.mCompositionBounds.SetEmpty(); mPaintData.mScrollOffset.MoveTo(0, 0); Layer* primaryScrollable = ClientManager()->GetPrimaryScrollableLayer(); if (primaryScrollable) { const FrameMetrics& metrics = primaryScrollable->AsContainerLayer()->GetFrameMetrics(); mPaintData.mScrollOffset = metrics.mScrollOffset * metrics.mZoom; mPaintData.mCompositionBounds = ApplyScreenToLayoutTransform(mPaintData.mTransformScreenToLayout, ScreenRect(metrics.mCompositionBounds)); } }
// 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, float aAccConfigXScale = 1, float aAccConfigYScale = 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(); nscoord auPerCSSPixel = auPerDevPixel * metrics.mDevPixelsPerCSSPixel; 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; // If scale has changed, then we should update // current scroll offset to new scaled value if (aAccConfigXScale != view->mParentScaleX || aAccConfigYScale != view->mParentScaleY) { float xscroll = 0, yscroll = 0; view->GetScrollX(&xscroll); view->GetScrollY(&yscroll); xscroll = xscroll * (aAccConfigXScale / view->mParentScaleX); yscroll = yscroll * (aAccConfigYScale / view->mParentScaleY); view->ScrollTo(xscroll, yscroll); view->mParentScaleX = aAccConfigXScale; view->mParentScaleY = aAccConfigYScale; } // Collect only config scale values for scroll compensation aAccConfigXScale *= config.mXScale; aAccConfigYScale *= config.mYScale; } 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.mScrollOffset.x, auPerCSSPixel) * aXScale, NSIntPixelsToAppUnits(metrics.mScrollOffset.y, auPerCSSPixel) * aYScale); view = new nsContentView(aFrameLoader, scrollId, config); view->mParentScaleX = aAccConfigXScale; view->mParentScaleY = aAccConfigYScale; } view->mViewportSize = nsSize( NSIntPixelsToAppUnits(metrics.mViewport.width, auPerDevPixel) * aXScale, NSIntPixelsToAppUnits(metrics.mViewport.height, auPerDevPixel) * aYScale); view->mContentSize = nsSize( NSIntPixelsToAppUnits(metrics.mContentRect.width, auPerDevPixel) * aXScale, NSIntPixelsToAppUnits(metrics.mContentRect.height, auPerDevPixel) * aYScale); newContentViews[scrollId] = view; } for (Layer* child = aLayer->GetFirstChild(); child; child = child->GetNextSibling()) { BuildViewMap(oldContentViews, newContentViews, aFrameLoader, child, aXScale, aYScale, aAccConfigXScale, aAccConfigYScale); } }
void CompositorParent::TransformShadowTree() { Layer* layer = GetPrimaryScrollableLayer(); ShadowLayer* shadow = layer->AsShadowLayer(); ContainerLayer* container = layer->AsContainerLayer(); const FrameMetrics& metrics = container->GetFrameMetrics(); const gfx3DMatrix& rootTransform = mLayerManager->GetRoot()->GetTransform(); const gfx3DMatrix& currentTransform = layer->GetTransform(); float rootScaleX = rootTransform.GetXScale(); float rootScaleY = rootTransform.GetYScale(); if (mIsFirstPaint) { mContentRect = metrics.mContentRect; SetFirstPaintViewport(metrics.mViewportScrollOffset, 1/rootScaleX, mContentRect, metrics.mCSSContentRect); mIsFirstPaint = false; } else if (!metrics.mContentRect.IsEqualEdges(mContentRect)) { mContentRect = metrics.mContentRect; SetPageRect(1/rootScaleX, mContentRect, metrics.mCSSContentRect); } // 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 nsIntRect displayPort = metrics.mDisplayPort; nsIntPoint scrollOffset = metrics.mViewportScrollOffset; displayPort.x += scrollOffset.x; displayPort.y += scrollOffset.y; SyncViewportInfo(displayPort, 1/rootScaleX, mLayersUpdated, mScrollOffset, mXScale, mYScale); mLayersUpdated = false; // 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 * mXScale; float tempScaleDiffY = rootScaleY * mYScale; nsIntPoint metricsScrollOffset(0, 0); if (metrics.IsScrollable()) metricsScrollOffset = metrics.mViewportScrollOffset; nsIntPoint scrollCompensation( (mScrollOffset.x / tempScaleDiffX - metricsScrollOffset.x) * mXScale, (mScrollOffset.y / tempScaleDiffY - metricsScrollOffset.y) * mYScale); ViewTransform treeTransform(-scrollCompensation, mXScale, mYScale); shadow->SetShadowTransform(gfx3DMatrix(treeTransform) * currentTransform); // Alter the scroll offset so that fixed position layers remain within // the page area. float offsetX = mScrollOffset.x / tempScaleDiffX; float offsetY = mScrollOffset.y / tempScaleDiffY; offsetX = NS_MAX((float)mContentRect.x, NS_MIN(offsetX, (float)(mContentRect.XMost() - mWidgetSize.width))); offsetY = NS_MAX((float)mContentRect.y, NS_MIN(offsetY, (float)(mContentRect.YMost() - mWidgetSize.height))); gfxPoint reverseViewTranslation(offsetX - metricsScrollOffset.x, offsetY - metricsScrollOffset.y); TranslateFixedLayers(layer, reverseViewTranslation); }