Shrink RenderLayerCompositor by 5% by removing unused code

Remove has3DContent, layerHas3DContent
The last vestiges of these functions were removed with
https://src.chromium.org/viewvc/blink?revision=167695&view=revision
when Abarth removed isSoftwareRenderable.

Remove computeFixedViewportConstraints, computeStickyViewportConstraints
Jamesr removed the last callers in
https://src.chromium.org/viewvc/blink?view=rev&revision=147653

Remove clearMappingForAllRenderLayers, clearMappingForRenderLayerIncludingDescendants
These functions were added (under a different name) by Simon Fraser in
http://trac.webkit.org/changeset/90484. Jamesr removed the caller
in https://codereview.chromium.org/13818029.

Remove setCompositingParent, removeCompositedChildren
This code predates written history and possibly humankind.

Remove updateLayerTreeGeometry
Abarth removed the implementation but left the function definition in
https://src.chromium.org/viewvc/blink?view=rev&revision=168244

Remove updateGraphicsLayersMappedToRenderLayer
Abarth removed the implementation but left the function definition in
https://src.chromium.org/viewvc/blink?view=rev&revision=167697

Remove hasAnyAdditionalCompositedLayers
Shawn Singh removed the implementation but left the function definition
in https://src.chromium.org/viewvc/blink?view=rev&revision=163720

Review URL: https://codereview.chromium.org/209703002

git-svn-id: svn://svn.chromium.org/blink/trunk@169866 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/rendering/compositing/RenderLayerCompositor.cpp

@@ -1572,25 +1572,6 @@ void RenderLayerCompositor::setIsInWindow(bool isInWindow)
     }
 }
 
-void RenderLayerCompositor::clearMappingForRenderLayerIncludingDescendants(RenderLayer* layer)
-{
-    if (!layer)
-        return;
-
-    if (layer->hasCompositedLayerMapping()) {
-        removeViewportConstrainedLayer(layer);
-        layer->clearCompositedLayerMapping();
-    }
-
-    for (RenderLayer* currLayer = layer->firstChild(); currLayer; currLayer = currLayer->nextSibling())
-        clearMappingForRenderLayerIncludingDescendants(currLayer);
-}
-
-void RenderLayerCompositor::clearMappingForAllRenderLayers()
-{
-    clearMappingForRenderLayerIncludingDescendants(m_renderView.layer());
-}
-
 void RenderLayerCompositor::updateRootLayerPosition()
 {
     if (m_rootContentLayer) {
@@ -1608,11 +1589,6 @@ void RenderLayerCompositor::updateRootLayerPosition()
     }
 }
 
-bool RenderLayerCompositor::has3DContent() const
-{
-    return layerHas3DContent(rootRenderLayer());
-}
-
 void RenderLayerCompositor::updateStyleDeterminedCompositingReasons(RenderLayer* layer)
 {
     CompositingReasons reasons = m_compositingReasonFinder.styleDeterminedReasons(layer->renderer());
@@ -2150,32 +2126,6 @@ void RenderLayerCompositor::notifyIFramesOfCompositingChange()
     }
 }
 
-bool RenderLayerCompositor::layerHas3DContent(const RenderLayer* layer) const
-{
-    const RenderStyle* style = layer->renderer()->style();
-    RenderLayerStackingNode* stackingNode = const_cast<RenderLayer*>(layer)->stackingNode();
-
-    if (style &&
-        (style->transformStyle3D() == TransformStyle3DPreserve3D ||
-         style->hasPerspective() ||
-         style->transform().has3DOperation()))
-        return true;
-
-    stackingNode->updateLayerListsIfNeeded();
-
-#if !ASSERT_DISABLED
-    LayerListMutationDetector mutationChecker(stackingNode);
-#endif
-
-    RenderLayerStackingNodeIterator iterator(*layer->stackingNode(), AllChildren);
-    while (RenderLayerStackingNode* curNode = iterator.next()) {
-        if (layerHas3DContent(curNode->layer()))
-            return true;
-    }
-
-    return false;
-}
-
 void RenderLayerCompositor::updateViewportConstraintStatus(RenderLayer* layer)
 {
     if (CompositingReasonFinder::isViewportConstrainedFixedOrStickyLayer(layer))
@@ -2197,67 +2147,6 @@ void RenderLayerCompositor::removeViewportConstrainedLayer(RenderLayer* layer)
     m_viewportConstrainedLayers.remove(layer);
 }
 
-FixedPositionViewportConstraints RenderLayerCompositor::computeFixedViewportConstraints(RenderLayer* layer) const
-{
-    ASSERT(layer->hasCompositedLayerMapping());
-
-    FrameView* frameView = m_renderView.frameView();
-    LayoutRect viewportRect = frameView->viewportConstrainedVisibleContentRect();
-
-    FixedPositionViewportConstraints constraints;
-
-    GraphicsLayer* graphicsLayer = layer->compositedLayerMapping()->mainGraphicsLayer();
-
-    constraints.setLayerPositionAtLastLayout(graphicsLayer->position());
-    constraints.setViewportRectAtLastLayout(viewportRect);
-
-    RenderStyle* style = layer->renderer()->style();
-    if (!style->left().isAuto())
-        constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeLeft);
-
-    if (!style->right().isAuto())
-        constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeRight);
-
-    if (!style->top().isAuto())
-        constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeTop);
-
-    if (!style->bottom().isAuto())
-        constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeBottom);
-
-    // If left and right are auto, use left.
-    if (style->left().isAuto() && style->right().isAuto())
-        constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeLeft);
-
-    // If top and bottom are auto, use top.
-    if (style->top().isAuto() && style->bottom().isAuto())
-        constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeTop);
-
-    return constraints;
-}
-
-StickyPositionViewportConstraints RenderLayerCompositor::computeStickyViewportConstraints(RenderLayer* layer) const
-{
-    ASSERT(layer->hasCompositedLayerMapping());
-    // We should never get here for stickies constrained by an enclosing clipping layer.
-    ASSERT(!layer->enclosingOverflowClipLayer(ExcludeSelf));
-
-    FrameView* frameView = m_renderView.frameView();
-    LayoutRect viewportRect = frameView->viewportConstrainedVisibleContentRect();
-
-    StickyPositionViewportConstraints constraints;
-
-    RenderBoxModelObject* renderer = toRenderBoxModelObject(layer->renderer());
-
-    renderer->computeStickyPositionConstraints(constraints, viewportRect);
-
-    GraphicsLayer* graphicsLayer = layer->compositedLayerMapping()->mainGraphicsLayer();
-
-    constraints.setLayerPositionAtLastLayout(graphicsLayer->position());
-    constraints.setStickyOffsetAtLastLayout(renderer->stickyPositionOffset());
-
-    return constraints;
-}
-
 ScrollingCoordinator* RenderLayerCompositor::scrollingCoordinator() const
 {
     if (Page* page = this->page())

third_party/WebKit/Source/core/rendering/compositing/RenderLayerCompositor.h

@@ -166,12 +166,6 @@ public:
 
     void setIsInWindow(bool);
 
-    void clearMappingForAllRenderLayers();
-
-    // Walk the tree looking for layers with 3d transforms. Useful in case you need
-    // to know if there is non-affine content, e.g. for drawing into an image.
-    bool has3DContent() const;
-
     static RenderLayerCompositor* frameContentsCompositor(RenderPart*);
     // Return true if the layers changed.
     static bool parentFrameContentLayers(RenderPart*);
@@ -273,8 +267,6 @@ private:
     bool allocateOrClearCompositedLayerMapping(RenderLayer*, CompositingStateTransitionType compositedLayerUpdate);
     bool updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType compositedLayerUpdate);
 
-    void clearMappingForRenderLayerIncludingDescendants(RenderLayer*);
-
     void recursiveRepaintLayer(RenderLayer*);
 
     void addToOverlapMap(OverlapMap&, RenderLayer*, const IntRect& layerBounds);
@@ -289,18 +281,10 @@ private:
     void assignLayersToBackings(RenderLayer*, bool& layersChanged);
     void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, bool& layersChanged, RenderLayer* clippingAncestor);
 
-    // Allocates, sets up hierarchy, and sets appropriate properties for the GraphicsLayers that correspond to a given
-    // composited RenderLayer. Does nothing if the given RenderLayer does not have a CompositedLayerMapping.
-    void updateGraphicsLayersMappedToRenderLayer(RenderLayer*);
-
-    // Recurses down the tree, updating layer geometry only.
-    void updateLayerTreeGeometry(RenderLayer*);
-
     // Hook compositing layers together
     void setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer);
     void removeCompositedChildren(RenderLayer*);
 
-    bool layerHas3DContent(const RenderLayer*) const;
     bool isRunningAcceleratedTransformAnimation(RenderObject*) const;
 
     bool hasAnyAdditionalCompositedLayers(const RenderLayer* rootLayer) const;
@@ -324,9 +308,6 @@ private:
 
     void addViewportConstrainedLayer(RenderLayer*);
 
-    FixedPositionViewportConstraints computeFixedViewportConstraints(RenderLayer*) const;
-    StickyPositionViewportConstraints computeStickyViewportConstraints(RenderLayer*) const;
-
     bool requiresHorizontalScrollbarLayer() const;
     bool requiresVerticalScrollbarLayer() const;
     bool requiresScrollCornerLayer() const;