Bug 187268 - [GTK] Layout test compositing/backing/backing-store-attachment-outside-viewport.html is failing
Summary: [GTK] Layout test compositing/backing/backing-store-attachment-outside-viewpo...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebKitGTK (show other bugs)
Version: Other
Hardware: PC Linux
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-07-02 14:34 PDT by Michael Catanzaro
Modified: 2018-07-31 04:48 PDT (History)
6 users (show)

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Description Michael Catanzaro 2018-07-02 14:34:45 PDT 
Layout test compositing/backing/backing-store-attachment-outside-viewport.html was added in r233268 "https://hackernoon.com/ uses lots of layer backing store" is failing for GTK with the following diff:

--- /home/slave/webkitgtk/gtk-linux-64-release-tests/build/layout-test-results/compositing/backing/backing-store-attachment-outside-viewport-expected.txt
+++ /home/slave/webkitgtk/gtk-linux-64-release-tests/build/layout-test-results/compositing/backing/backing-store-attachment-outside-viewport-actual.txt
@@ -18,13 +18,13 @@
           (position 8.00 1613.00)
           (bounds 600.00 600.00)
           (drawsContent 1)
-          (backingStoreAttached 0)
+          (backingStoreAttached 1)
         )
         (GraphicsLayer
           (position 8.00 3213.00)
           (bounds 600.00 600.00)
           (drawsContent 1)
-          (backingStoreAttached 0)
+          (backingStoreAttached 1)
         )
       )
     )

I don't know anything, but I assume that means we are using memory to hold content that is not drawn, so perhaps this is of interest to the graphics folks.
Comment 1 Simon Fraser (smfr) 2018-07-25 08:27:11 PDT 
The "backing store attached" logic is in GraphicsLayerCA. I don't know how to detach backing store on the other platforms.