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1 /* | 1 /* |
2 * Copyright (C) 2011 Apple Inc. All rights reserved. | 2 * Copyright (C) 2011 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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930 #endif | 930 #endif |
931 | 931 |
932 bool ScrollingCoordinator::hasVisibleSlowRepaintViewportConstrainedObjects(Frame
View* frameView) const | 932 bool ScrollingCoordinator::hasVisibleSlowRepaintViewportConstrainedObjects(Frame
View* frameView) const |
933 { | 933 { |
934 const FrameView::ViewportConstrainedObjectSet* viewportConstrainedObjects =
frameView->viewportConstrainedObjects(); | 934 const FrameView::ViewportConstrainedObjectSet* viewportConstrainedObjects =
frameView->viewportConstrainedObjects(); |
935 if (!viewportConstrainedObjects) | 935 if (!viewportConstrainedObjects) |
936 return false; | 936 return false; |
937 | 937 |
938 for (const LayoutObject* layoutObject : *viewportConstrainedObjects) { | 938 for (const LayoutObject* layoutObject : *viewportConstrainedObjects) { |
939 ASSERT(layoutObject->isBoxModelObject() && layoutObject->hasLayer()); | 939 ASSERT(layoutObject->isBoxModelObject() && layoutObject->hasLayer()); |
940 ASSERT(layoutObject->style()->position() == FixedPosition); | 940 ASSERT(layoutObject->style()->position() == FixedPosition |
| 941 || layoutObject->style()->position() == StickyPosition); |
941 PaintLayer* layer = toLayoutBoxModelObject(layoutObject)->layer(); | 942 PaintLayer* layer = toLayoutBoxModelObject(layoutObject)->layer(); |
942 | 943 |
943 // Whether the Layer scrolls with the viewport is a tree-depenent | 944 // Whether the Layer scrolls with the viewport is a tree-depenent |
944 // property and our viewportConstrainedObjects collection is maintained | 945 // property and our viewportConstrainedObjects collection is maintained |
945 // with only LayoutObject-level information. | 946 // with only LayoutObject-level information. |
946 if (!layer->scrollsWithViewport()) | 947 if (!layer->scrollsWithViewport()) |
947 continue; | 948 continue; |
948 | 949 |
949 // If the whole subtree is invisible, there's no reason to scroll on | 950 // If the whole subtree is invisible, there's no reason to scroll on |
950 // the main thread because we don't need to generate invalidations | 951 // the main thread because we don't need to generate invalidations |
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979 for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traver
seNext()) { | 980 for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traver
seNext()) { |
980 if (!frame->isLocalFrame()) | 981 if (!frame->isLocalFrame()) |
981 continue; | 982 continue; |
982 | 983 |
983 FrameView* frameView = toLocalFrame(frame)->view(); | 984 FrameView* frameView = toLocalFrame(frame)->view(); |
984 if (!frameView || frameView->shouldThrottleRendering()) | 985 if (!frameView || frameView->shouldThrottleRendering()) |
985 continue; | 986 continue; |
986 | 987 |
987 if (frameView->hasBackgroundAttachmentFixedObjects()) | 988 if (frameView->hasBackgroundAttachmentFixedObjects()) |
988 reasons |= MainThreadScrollingReason::kHasBackgroundAttachmentFixedO
bjects; | 989 reasons |= MainThreadScrollingReason::kHasBackgroundAttachmentFixedO
bjects; |
| 990 if (frameView->hasStickyPositionObjects()) |
| 991 reasons |= MainThreadScrollingReason::kHasStickyPositionObjects; |
989 FrameView::ScrollingReasons scrollingReasons = frameView->getScrollingRe
asons(); | 992 FrameView::ScrollingReasons scrollingReasons = frameView->getScrollingRe
asons(); |
990 const bool mayBeScrolledByInput = (scrollingReasons == FrameView::Scroll
able); | 993 const bool mayBeScrolledByInput = (scrollingReasons == FrameView::Scroll
able); |
991 const bool mayBeScrolledByScript = mayBeScrolledByInput || (scrollingRea
sons == | 994 const bool mayBeScrolledByScript = mayBeScrolledByInput || (scrollingRea
sons == |
992 FrameView::NotScrollableExplicitlyDisabled); | 995 FrameView::NotScrollableExplicitlyDisabled); |
993 | 996 |
994 // TODO(awoloszyn) Currently crbug.com/304810 will let certain | 997 // TODO(awoloszyn) Currently crbug.com/304810 will let certain |
995 // overflow:hidden elements scroll on the compositor thread, so we shoul
d | 998 // overflow:hidden elements scroll on the compositor thread, so we shoul
d |
996 // not let this move there path as an optimization, when we have slow-re
paint | 999 // not let this move there path as an optimization, when we have slow-re
paint |
997 // elements. | 1000 // elements. |
998 if (mayBeScrolledByScript && hasVisibleSlowRepaintViewportConstrainedObj
ects(frameView)) { | 1001 if (mayBeScrolledByScript && hasVisibleSlowRepaintViewportConstrainedObj
ects(frameView)) { |
999 reasons |= MainThreadScrollingReason::kHasNonLayerViewportConstraine
dObjects; | 1002 reasons |= MainThreadScrollingReason::kHasNonLayerViewportConstraine
dObjects; |
1000 } | 1003 } |
1001 } | 1004 } |
1002 | 1005 |
1003 return reasons; | 1006 return reasons; |
1004 } | 1007 } |
1005 | 1008 |
1006 String ScrollingCoordinator::mainThreadScrollingReasonsAsText(MainThreadScrollin
gReasons reasons) | 1009 String ScrollingCoordinator::mainThreadScrollingReasonsAsText(MainThreadScrollin
gReasons reasons) |
1007 { | 1010 { |
1008 StringBuilder stringBuilder; | 1011 StringBuilder stringBuilder; |
1009 | 1012 |
1010 if (reasons & MainThreadScrollingReason::kHasBackgroundAttachmentFixedObject
s) | 1013 if (reasons & MainThreadScrollingReason::kHasBackgroundAttachmentFixedObject
s) |
1011 stringBuilder.appendLiteral("Has background-attachment:fixed, "); | 1014 stringBuilder.appendLiteral("Has background-attachment:fixed, "); |
1012 if (reasons & MainThreadScrollingReason::kHasNonLayerViewportConstrainedObje
cts) | 1015 if (reasons & MainThreadScrollingReason::kHasNonLayerViewportConstrainedObje
cts) |
1013 stringBuilder.appendLiteral("Has non-layer viewport-constrained objects,
"); | 1016 stringBuilder.appendLiteral("Has non-layer viewport-constrained objects,
"); |
| 1017 if (reasons & MainThreadScrollingReason::kHasStickyPositionObjects) |
| 1018 stringBuilder.appendLiteral("Has sticky position objects, "); |
1014 if (reasons & MainThreadScrollingReason::kThreadedScrollingDisabled) | 1019 if (reasons & MainThreadScrollingReason::kThreadedScrollingDisabled) |
1015 stringBuilder.appendLiteral("Threaded scrolling is disabled, "); | 1020 stringBuilder.appendLiteral("Threaded scrolling is disabled, "); |
1016 if (reasons & MainThreadScrollingReason::kAnimatingScrollOnMainThread) | 1021 if (reasons & MainThreadScrollingReason::kAnimatingScrollOnMainThread) |
1017 stringBuilder.appendLiteral("Animating scroll on main thread, "); | 1022 stringBuilder.appendLiteral("Animating scroll on main thread, "); |
1018 | 1023 |
1019 if (stringBuilder.length()) | 1024 if (stringBuilder.length()) |
1020 stringBuilder.resize(stringBuilder.length() - 2); | 1025 stringBuilder.resize(stringBuilder.length() - 2); |
1021 return stringBuilder.toString(); | 1026 return stringBuilder.toString(); |
1022 } | 1027 } |
1023 | 1028 |
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1036 bool frameIsScrollable = frameView && frameView->isScrollable(); | 1041 bool frameIsScrollable = frameView && frameView->isScrollable(); |
1037 if (frameIsScrollable != m_wasFrameScrollable) | 1042 if (frameIsScrollable != m_wasFrameScrollable) |
1038 return true; | 1043 return true; |
1039 | 1044 |
1040 if (WebLayer* scrollLayer = frameView ? toWebLayer(frameView->layerForScroll
ing()) : nullptr) | 1045 if (WebLayer* scrollLayer = frameView ? toWebLayer(frameView->layerForScroll
ing()) : nullptr) |
1041 return WebSize(frameView->contentsSize()) != scrollLayer->bounds(); | 1046 return WebSize(frameView->contentsSize()) != scrollLayer->bounds(); |
1042 return false; | 1047 return false; |
1043 } | 1048 } |
1044 | 1049 |
1045 } // namespace blink | 1050 } // namespace blink |
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