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    <body><span class="vcard"><a class="email" href="mailto:thorton&#64;apple.com" title="Tim Horton &lt;thorton&#64;apple.com&gt;"> <span class="fn">Tim Horton</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Should use CARenderServerRenderLayerWithTransform for snapshots on iOS"
   href="https://bugs.webkit.org/show_bug.cgi?id=149069">bug 149069</a>
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            <th>What</th>
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           <td style="text-align:right;">Attachment #261010 Flags</td>
           <td>review?
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           <td>review+
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Should use CARenderServerRenderLayerWithTransform for snapshots on iOS"
   href="https://bugs.webkit.org/show_bug.cgi?id=149069#c2">Comment # 2</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Should use CARenderServerRenderLayerWithTransform for snapshots on iOS"
   href="https://bugs.webkit.org/show_bug.cgi?id=149069">bug 149069</a>
              from <span class="vcard"><a class="email" href="mailto:thorton&#64;apple.com" title="Tim Horton &lt;thorton&#64;apple.com&gt;"> <span class="fn">Tim Horton</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=261010&amp;action=diff" name="attach_261010" title="Patch">attachment 261010</a> <a href="attachment.cgi?id=261010&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=261010&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=261010&amp;action=review</a>

<span class="quote">&gt; Source/WebKit2/ChangeLog:11
&gt; +        This will let us own the backing IOSurface, which will let us make them 
&gt; +        purgeable and share more code with Mac.</span >

Except we're not going to make them purgeable for now and it's not clear that that is actually the plan so maybe we shouldn't mention that part :D

<span class="quote">&gt; Source/WebKit2/UIProcess/API/Cocoa/WKWebView.mm:1110
&gt; +    auto surface = WebCore::IOSurface::create(WebCore::expandedIntSize(snapshotSize), WebCore::ColorSpaceDeviceRGB);</span >

We should do more perf testing here.

<span class="quote">&gt; Source/WebKit2/UIProcess/API/Cocoa/WKWebView.mm:1111
&gt; +    CARenderServerRenderLayerWithTransform(MACH_PORT_NULL, self.layer.context.contextId, reinterpret_cast&lt;uint64_t&gt;(self.layer), surface-&gt;surface(), 0, 0, &amp;transform);</span >

I wonder if we have to use some other function on older OSes, like _snapshotWhatever does? Probably.

<span class="quote">&gt; Source/WebKit2/UIProcess/mac/ViewSnapshotStore.h:-44
&gt; -#if PLATFORM(MAC)</span >

YAYYYYY</pre>
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