1 /*
2 * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
3 * Copyright (C) 2014 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "config.h"
28 #include "core/rendering/compositing/GraphicsLayerTreeBuilder.h"
29
30 #include "core/html/HTMLMediaElement.h"
31 #include "core/rendering/RenderLayer.h"
32 #include "core/rendering/RenderLayerReflectionInfo.h"
33 #include "core/rendering/RenderPart.h"
34 #include "core/rendering/RenderView.h"
35 #include "core/rendering/compositing/CompositedLayerMapping.h"
36 #include "core/rendering/compositing/RenderLayerCompositor.h"
37
38 namespace WebCore {
39
GraphicsLayerTreeBuilder()40 GraphicsLayerTreeBuilder::GraphicsLayerTreeBuilder()
41 {
42 }
43
~GraphicsLayerTreeBuilder()44 GraphicsLayerTreeBuilder::~GraphicsLayerTreeBuilder()
45 {
46 }
47
shouldAppendLayer(const RenderLayer & layer)48 static bool shouldAppendLayer(const RenderLayer& layer)
49 {
50 if (!RuntimeEnabledFeatures::overlayFullscreenVideoEnabled())
51 return true;
52 Node* node = layer.renderer()->node();
53 if (node && isHTMLMediaElement(*node) && toHTMLMediaElement(node)->isFullscreen())
54 return false;
55 return true;
56 }
57
rebuild(RenderLayer & layer,GraphicsLayerVector & childLayersOfEnclosingLayer)58 void GraphicsLayerTreeBuilder::rebuild(RenderLayer& layer, GraphicsLayerVector& childLayersOfEnclosingLayer)
59 {
60 // Make the layer compositing if necessary, and set up clipping and content layers.
61 // Note that we can only do work here that is independent of whether the descendant layers
62 // have been processed. computeCompositingRequirements() will already have done the repaint if necessary.
63
64 layer.stackingNode()->updateLayerListsIfNeeded();
65
66 const bool hasCompositedLayerMapping = layer.hasCompositedLayerMapping();
67 CompositedLayerMappingPtr currentCompositedLayerMapping = layer.compositedLayerMapping();
68
69 // If this layer has a compositedLayerMapping, then that is where we place subsequent children GraphicsLayers.
70 // Otherwise children continue to append to the child list of the enclosing layer.
71 GraphicsLayerVector layerChildren;
72 GraphicsLayerVector& childList = hasCompositedLayerMapping ? layerChildren : childLayersOfEnclosingLayer;
73
74 #if ASSERT_ENABLED
75 LayerListMutationDetector mutationChecker(layer.stackingNode());
76 #endif
77
78 if (layer.stackingNode()->isStackingContext()) {
79 RenderLayerStackingNodeIterator iterator(*layer.stackingNode(), NegativeZOrderChildren);
80 while (RenderLayerStackingNode* curNode = iterator.next())
81 rebuild(*curNode->layer(), childList);
82
83 // If a negative z-order child is compositing, we get a foreground layer which needs to get parented.
84 if (hasCompositedLayerMapping && currentCompositedLayerMapping->foregroundLayer())
85 childList.append(currentCompositedLayerMapping->foregroundLayer());
86 }
87
88 RenderLayerStackingNodeIterator iterator(*layer.stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
89 while (RenderLayerStackingNode* curNode = iterator.next())
90 rebuild(*curNode->layer(), childList);
91
92 if (hasCompositedLayerMapping) {
93 bool parented = false;
94 if (layer.renderer()->isRenderPart())
95 parented = RenderLayerCompositor::parentFrameContentLayers(toRenderPart(layer.renderer()));
96
97 if (!parented)
98 currentCompositedLayerMapping->parentForSublayers()->setChildren(layerChildren);
99
100 // If the layer has a clipping layer the overflow controls layers will be siblings of the clipping layer.
101 // Otherwise, the overflow control layers are normal children.
102 if (!currentCompositedLayerMapping->hasClippingLayer() && !currentCompositedLayerMapping->hasScrollingLayer()) {
103 if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForHorizontalScrollbar()) {
104 overflowControlLayer->removeFromParent();
105 currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
106 }
107
108 if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForVerticalScrollbar()) {
109 overflowControlLayer->removeFromParent();
110 currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
111 }
112
113 if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForScrollCorner()) {
114 overflowControlLayer->removeFromParent();
115 currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
116 }
117 }
118
119 if (shouldAppendLayer(layer))
120 childLayersOfEnclosingLayer.append(currentCompositedLayerMapping->childForSuperlayers());
121 }
122 }
123
124 }
125