[iOS WK2] Avoid setting contentsScale and rasterizationScale on CATra…

…nsformLayers

https://bugs.webkit.org/show_bug.cgi?id=172569

Reviewed by Dean Jackson.

Setting contentsScale and rasterizationScale on CATransformLayers is a waste of CPU time,
and triggers unwanted logging, so don't do it.

* WebProcess/WebPage/mac/PlatformCALayerRemote.cpp:
(WebKit::PlatformCALayerRemote::PlatformCALayerRemote):


Canonical link: https://commits.webkit.org/189506@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@217442 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebKit2/ChangeLog

@@ -1,3 +1,16 @@
+2017-05-25  Simon Fraser  <simon.fraser@apple.com>
+
+        [iOS WK2] Avoid setting contentsScale and rasterizationScale on CATransformLayers
+        https://bugs.webkit.org/show_bug.cgi?id=172569
+
+        Reviewed by Dean Jackson.
+
+        Setting contentsScale and rasterizationScale on CATransformLayers is a waste of CPU time,
+        and triggers unwanted logging, so don't do it.
+
+        * WebProcess/WebPage/mac/PlatformCALayerRemote.cpp:
+        (WebKit::PlatformCALayerRemote::PlatformCALayerRemote):
+
 2017-05-25  Matt Lewis  <jlewis3@apple.com>
 
         Unreviewed, rolling out r217409.

Source/WebKit2/WebProcess/WebPage/mac/PlatformCALayerRemote.cpp

@@ -76,7 +76,7 @@ PlatformCALayerRemote::PlatformCALayerRemote(LayerType layerType, PlatformCALaye
     : PlatformCALayer(layerType, owner)
     , m_context(&context)
 {
-    if (owner && layerType != LayerTypeContentsProvidedLayer) {
+    if (owner && layerType != LayerTypeContentsProvidedLayer && layerType != LayerTypeTransformLayer) {
         m_properties.contentsScale = owner->platformCALayerDeviceScaleFactor();
         m_properties.notePropertiesChanged(RemoteLayerTreeTransaction::ContentsScaleChanged);
     }