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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/layout/compositing/CompositingReasonFinder.h" | 5 #include "core/layout/compositing/CompositingReasonFinder.h" |
6 | 6 |
7 #include "core/CSSPropertyNames.h" | 7 #include "core/CSSPropertyNames.h" |
8 #include "core/dom/Document.h" | 8 #include "core/dom/Document.h" |
9 #include "core/frame/FrameView.h" | 9 #include "core/frame/FrameView.h" |
10 #include "core/frame/Settings.h" | 10 #include "core/frame/Settings.h" |
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26 m_compositingTriggers = 0; | 26 m_compositingTriggers = 0; |
27 | 27 |
28 Settings& settings = m_layoutView.document().page()->settings(); | 28 Settings& settings = m_layoutView.document().page()->settings(); |
29 if (settings.preferCompositingToLCDTextEnabled()) { | 29 if (settings.preferCompositingToLCDTextEnabled()) { |
30 m_compositingTriggers |= ScrollableInnerFrameTrigger; | 30 m_compositingTriggers |= ScrollableInnerFrameTrigger; |
31 m_compositingTriggers |= OverflowScrollTrigger; | 31 m_compositingTriggers |= OverflowScrollTrigger; |
32 m_compositingTriggers |= ViewportConstrainedPositionedTrigger; | 32 m_compositingTriggers |= ViewportConstrainedPositionedTrigger; |
33 } | 33 } |
34 } | 34 } |
35 | 35 |
36 bool CompositingReasonFinder::hasOverflowScrollTrigger() const | |
37 { | |
38 return m_compositingTriggers & OverflowScrollTrigger; | |
39 } | |
40 | |
41 bool CompositingReasonFinder::isMainFrame() const | 36 bool CompositingReasonFinder::isMainFrame() const |
42 { | 37 { |
43 return m_layoutView.document().isInMainFrame(); | 38 return m_layoutView.document().isInMainFrame(); |
44 } | 39 } |
45 | 40 |
46 CompositingReasons CompositingReasonFinder::directReasons(const PaintLayer* laye
r) const | 41 CompositingReasons CompositingReasonFinder::directReasons(const PaintLayer* laye
r) const |
47 { | 42 { |
48 if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) | 43 if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) |
49 return CompositingReasonNone; | 44 return CompositingReasonNone; |
50 | 45 |
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135 // Note that we ask the layoutObject if it has a transform, because the styl
e may have transforms, | 130 // Note that we ask the layoutObject if it has a transform, because the styl
e may have transforms, |
136 // but the layoutObject may be an inline that doesn't support them. | 131 // but the layoutObject may be an inline that doesn't support them. |
137 return layoutObject->hasTransformRelatedProperty() && layoutObject->style()-
>has3DTransform(); | 132 return layoutObject->hasTransformRelatedProperty() && layoutObject->style()-
>has3DTransform(); |
138 } | 133 } |
139 | 134 |
140 CompositingReasons CompositingReasonFinder::nonStyleDeterminedDirectReasons(cons
t PaintLayer* layer) const | 135 CompositingReasons CompositingReasonFinder::nonStyleDeterminedDirectReasons(cons
t PaintLayer* layer) const |
141 { | 136 { |
142 CompositingReasons directReasons = CompositingReasonNone; | 137 CompositingReasons directReasons = CompositingReasonNone; |
143 LayoutObject* layoutObject = layer->layoutObject(); | 138 LayoutObject* layoutObject = layer->layoutObject(); |
144 | 139 |
145 if (hasOverflowScrollTrigger()) { | 140 if (layer->needsCompositedScrolling()) |
146 if (layer->clipParent()) | 141 directReasons |= CompositingReasonOverflowScrollingTouch; |
147 directReasons |= CompositingReasonOutOfFlowClipping; | |
148 | |
149 if (layer->needsCompositedScrolling()) | |
150 directReasons |= CompositingReasonOverflowScrollingTouch; | |
151 } | |
152 | 142 |
153 // Composite |layer| if it is inside of an ancestor scrolling layer, but tha
t | 143 // Composite |layer| if it is inside of an ancestor scrolling layer, but tha
t |
154 // scrolling layer is not not on the stacking context ancestor chain of |lay
er|. | 144 // scrolling layer is not on the stacking context ancestor chain of |layer|. |
155 // See the definition of the scrollParent property in Layer for more detail. | 145 // See the definition of the scrollParent property in Layer for more detail. |
156 if (const PaintLayer* scrollingAncestor = layer->ancestorScrollingLayer()) { | 146 if (const PaintLayer* scrollingAncestor = layer->ancestorScrollingLayer()) { |
157 if (scrollingAncestor->needsCompositedScrolling() && layer->scrollParent
()) | 147 if (scrollingAncestor->needsCompositedScrolling() && layer->scrollParent
()) |
158 directReasons |= CompositingReasonOverflowScrollingParent; | 148 directReasons |= CompositingReasonOverflowScrollingParent; |
159 } | 149 } |
160 | 150 |
161 if (requiresCompositingForPositionFixed(layer)) | 151 if (requiresCompositingForPositionFixed(layer)) |
162 directReasons |= CompositingReasonPositionFixed; | 152 directReasons |= CompositingReasonPositionFixed; |
163 | 153 |
164 directReasons |= layoutObject->additionalCompositingReasons(); | 154 directReasons |= layoutObject->additionalCompositingReasons(); |
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178 bool CompositingReasonFinder::requiresCompositingForPositionFixed(const PaintLay
er* layer) const | 168 bool CompositingReasonFinder::requiresCompositingForPositionFixed(const PaintLay
er* layer) const |
179 { | 169 { |
180 if (!(m_compositingTriggers & ViewportConstrainedPositionedTrigger)) | 170 if (!(m_compositingTriggers & ViewportConstrainedPositionedTrigger)) |
181 return false; | 171 return false; |
182 // Don't promote fixed position elements that are descendants of a non-view
container, e.g. transformed elements. | 172 // Don't promote fixed position elements that are descendants of a non-view
container, e.g. transformed elements. |
183 // They will stay fixed wrt the container rather than the enclosing frame. | 173 // They will stay fixed wrt the container rather than the enclosing frame. |
184 return layer->scrollsWithViewport() && m_layoutView.frameView()->isScrollabl
e(); | 174 return layer->scrollsWithViewport() && m_layoutView.frameView()->isScrollabl
e(); |
185 } | 175 } |
186 | 176 |
187 } // namespace blink | 177 } // namespace blink |
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