[Webkit-unassigned] [Bug 194179] Clarify layer nomenclature for the root scrolling layers
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Fri Feb 1 17:13:46 PST 2019
https://bugs.webkit.org/show_bug.cgi?id=194179
--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
On iOS, for the root we make no scrolling views in RenderLayerCompositor.
For subframes, the UIView is equivalent to the "frame scrolling" layer, which is confusing.
Here's the GraphicsLayer tree on iOS:
RenderLayerCompositor::updateCompositingLayers - GraphicsLayers post, contentLayersCount 1
(GraphicsLayer 0x346cfe840 "GraphicsLayer(0x346cfe840, 14) content root"
(bounds 980.00 5029.00)
(children 2
(GraphicsLayer 0x346cfeb00 "GraphicsLayer(0x346cfeb00, 17) RenderView"
(bounds 980.00 5029.00)
(children 1
(GraphicsLayer 0x346cfedc0 "GraphicsLayer(0x346cfedc0, 19) Page TiledBacking containment"
(children 1
(GraphicsLayer 0x346ce4b00 "GraphicsLayer(0x346ce4b00, 26) <iframe>"
(offsetFromRenderer width=-20 height=-20)
(position 38.00 110.50)
(bounds 580.00 480.50)
(children 1
(GraphicsLayer 0x346cff340 "GraphicsLayer(0x346cff340, 21) overflow controls host"
(position 40.00 40.00)
(children 1
(GraphicsLayer 0x346cff600 "GraphicsLayer(0x346cff600, 22) frame scrolling"
(anchor 0.00 0.00)
(bounds 500.00 400.00)
(children 1
(GraphicsLayer 0x346cff080 "GraphicsLayer(0x346cff080, 20) content root"
(anchor 0.00 0.00)
(bounds 500.00 1304.00)
(children 1
(GraphicsLayer 0x346cff8c0 "GraphicsLayer(0x346cff8c0, 23) RenderView"
(bounds 500.00 1304.00)
(children 1
(GraphicsLayer 0x346ce4000 "GraphicsLayer(0x346ce4000, 25) Page TiledBacking containment"
(primary-layer-id 25)
and the UIViews built from it:
<WKWebView: 0x7f9a3a800800; frame = (0 0; 768 1024); gestureRecognizers = <NSArray: 0x7f9a38d07ed0>; layer = <CALayer: 0x7f9ad64322a0>>
| <WKScrollView: 0x7f9a3a81d000; baseClass = UIScrollView; frame = (0 0; 768 1024); gestureRecognizers = <NSArray: 0x7f9ad6433ad0>; layer = <CALayer: 0x7f9ad6433190>; contentOffset: {0, -61.5}; contentSize: {768, 3941}; adjustedContentInset: {70, 0, 0, 0}>
| | <WKContentView: 0x7f9a3a824000; frame = (0 0; 768 3941.09); transform = [0.78367346938775506, 0, 0, 0.78367346938775506, 0, 0]; gestureRecognizers = <NSArray: 0x7f9a36724810>; layer = <CALayer: 0x7f9ad6435a00>>
| | | <UIView: 0x7f9a365307c0; frame = (0 0; 980 5029); clipsToBounds = YES; layer = <CALayer: 0x7f9a365002e0>>
| | | | <UIView: 0x7f9a365305e0; frame = (0 0; 980 5029); autoresize = W+H; layer = <CALayer: 0x7f9a3650aaf0>>
| | | | | <WKCompositingView: 0x7f99fa50f5b0; frame = (0 0; 980 5029); layer = <CALayer: 0x7f99fa517340>> layerID = 1 "GraphicsLayer(0x346cfe580, 1) drawing area root"
| | | | | | <WKCompositingView: 0x7f9a38f399d0; frame = (0 0; 980 5029); layer = <CALayer: 0x7f9a38f08290>> layerID = 14 "GraphicsLayer(0x346cfe840, 14) content root"
| | | | | | | <WKCompositingView: 0x7f9a38f39140; frame = (0 0; 980 5029); layer = <CALayer: 0x7f9a38f1f9e0>> layerID = 17 "GraphicsLayer(0x346cfeb00, 17) RenderView"
| | | | | | | | <WKCompositingView: 0x7f9a38f111c0; frame = (0 0; 0 0); transform = [1.2760416269302368, 0, 0, 1.2760416269302368, 0, 0]; layer = <CALayer: 0x7f9a38f0fe50>> layerID = 18 "TileGrid container"
| | | | | | | | | <WKPlainRemoteLayer: 0x7f9a38f0d470> layerID = 27 "tile at 0,0" (layer)
| | | | | | | | | <WKPlainRemoteLayer: 0x7f9a38f58ff0> layerID = 28 "tile at 0,512" (layer)
| | | | | | | | | <WKPlainRemoteLayer: 0x7f9a38e39130> layerID = 31 "tile at 0,1024" (layer)
| | | | | | | | <WKCompositingView: 0x7f9a38f19540; frame = (0 0; 0 0); layer = <CALayer: 0x7f9a38f5e2a0>> layerID = 19 "GraphicsLayer(0x346cfedc0, 19) Page TiledBacking containment"
| | | | | | | | | <WKCompositingView: 0x7f9a38f4f240; frame = (37.9623 110.378; 580 480.5); layer = <CALayer: 0x7f9a38f4e730>> layerID = 26 "GraphicsLayer(0x346ce4b00, 26) <iframe>"
| | | | | | | | | | <WKCompositingView: 0x7f9a38f08960; frame = (40 40; 0 0); layer = <CALayer: 0x7f9a38f23480>> layerID = 21 "GraphicsLayer(0x346cff340, 21) overflow controls host"
| | | | | | | | | | | <WKChildScrollView: 0x7f9a3b818000; baseClass = UIScrollView; frame = (0 0; 500 400); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7f9a38f0e710>; layer = <CALayer: 0x7f9a38f471f0>; contentOffset: {0, 65.5}; contentSize: {500, 1304}; adjustedContentInset: {0, 0, 0, 0}> "frame scrolling (20)"
| | | | | | | | | | | | <WKCompositingView: 0x7f9a38f0b110; frame = (0 0; 500 1304); layer = <CALayer: 0x7f9a38f07c20>> layerID = 20 "GraphicsLayer(0x346cff080, 20) content root"
| | | | | | | | | | | | | <WKCompositingView: 0x7f9a38f08e40; frame = (-0.161467 -0.246099; 500 1304); layer = <CALayer: 0x7f9a38f15d20>> layerID = 23 "GraphicsLayer(0x346cff8c0, 23) RenderView"
| | | | | | | | | | | | | | <WKCompositingView: 0x7f9a38f2b9c0; frame = (0 0; 0 0); transform = [1.2760416269302368, 0, 0, 1.2760416269302368, 0, 0]; layer = <CALayer: 0x7f9a38f59260>> layerID = 24 "TileGrid container"
| | | | | | | | | | | | | | | <WKPlainRemoteLayer: 0x7f9a38f5b370> layerID = 29 "tile at 0,0" (layer)
| | | | | | | | | | | | | | | <WKPlainRemoteLayer: 0x7f9a38f5db50> layerID = 30 "tile at 0,512" (layer)
| | | | | | | | | | | | | | <WKCompositingView: 0x7f9a38f02e90; frame = (0 0; 0 0); layer = <CALayer: 0x7f9a38f22e00>> layerID = 25 "GraphicsLayer(0x346ce4000, 25) Page TiledBacking containment"
| | | | | | | | | | | | <UIImageView: 0x7f9a38f19e50; frame = (3 460; 491.5 2.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x7f9a38f2cfb0>>
| | | | | | | | | | | | <UIImageView: 0x7f9a38f5e440; frame = (494.5 88.5; 2.5 121); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x7f9a38f5ec00>>
| | | | | | | <WKCompositingView: 0x7f9a38f39320; frame = (0 0; 0 0); layer = <CALayer: 0x7f9a38f39500>> layerID = 15 "GraphicsLayer(0x346cfe000, 15) Document overlay Container"
| | | | | | <WKCompositingView: 0x7f9a38f2cd50; frame = (0 0; 0 0); layer = <CALayer: 0x7f9a38f5c840>> layerID = 16 "GraphicsLayer(0x346cfe2c0, 16) View overlay container"
| | <UIView: 0x7f9a36724070; frame = (0 0; 0 0); opaque = NO; layer = <CALayer: 0x7f9a36703aa0>>
| | <UIImageView: 0x7f99f7f07de0; frame = (3 957; 759.5 2.5); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x7f99f7f07c20>>
| | <UIImageView: 0x7f99f7f080e0; frame = (762.5 5; 2.5 244); opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x7f99f7f080c0>>
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