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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 "config.h" | |
6 #include "core/layout/compositing/CompositingReasonFinder.h" | 5 #include "core/layout/compositing/CompositingReasonFinder.h" |
7 | 6 |
8 #include "core/CSSPropertyNames.h" | 7 #include "core/CSSPropertyNames.h" |
9 #include "core/dom/Document.h" | 8 #include "core/dom/Document.h" |
10 #include "core/frame/FrameView.h" | 9 #include "core/frame/FrameView.h" |
11 #include "core/frame/Settings.h" | 10 #include "core/frame/Settings.h" |
12 #include "core/layout/LayoutView.h" | 11 #include "core/layout/LayoutView.h" |
13 #include "core/page/Page.h" | 12 #include "core/page/Page.h" |
14 #include "core/paint/PaintLayer.h" | 13 #include "core/paint/PaintLayer.h" |
15 | 14 |
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180 bool CompositingReasonFinder::requiresCompositingForPositionFixed(const PaintLay
er* layer) const | 179 bool CompositingReasonFinder::requiresCompositingForPositionFixed(const PaintLay
er* layer) const |
181 { | 180 { |
182 if (!(m_compositingTriggers & ViewportConstrainedPositionedTrigger)) | 181 if (!(m_compositingTriggers & ViewportConstrainedPositionedTrigger)) |
183 return false; | 182 return false; |
184 // Don't promote fixed position elements that are descendants of a non-view
container, e.g. transformed elements. | 183 // Don't promote fixed position elements that are descendants of a non-view
container, e.g. transformed elements. |
185 // They will stay fixed wrt the container rather than the enclosing frame. | 184 // They will stay fixed wrt the container rather than the enclosing frame. |
186 return layer->scrollsWithViewport() && m_layoutView.frameView()->isScrollabl
e(); | 185 return layer->scrollsWithViewport() && m_layoutView.frameView()->isScrollabl
e(); |
187 } | 186 } |
188 | 187 |
189 } | 188 } |
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