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Refactored image cache task - details below.
* Simpler image cache API for clients to use. * Significantly fewer threads. * One thread for image cache task (multiplexes commands, decoder threads and async resource requests). * 4 threads for decoder worker tasks. * Removed ReflowEvent hacks in script and layout tasks. * Image elements pass a Trusted<T> to image cache, which is used to dirty nodes via script task. Previous use of Untrusted addresses was unsafe. * Image requests such as background-image on layout / paint threads trigger repaint only rather than full reflow. * Add reflow batching for when multiple images load quickly. * Reduces the number of paints loading wikipedia from ~95 to ~35. * Reasonably simple to add proper prefetch support in a follow up PR. * Async loaded images always construct Image fragments now, instead of generic. * Image fragments support the image not being present. * Simpler implementation of synchronous image loading for reftests. * Removed image holder. * image.onload support. * image NaturalWidth and NaturalHeight support. * Updated WPT expectations.
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33 changed files with 2785 additions and 1679 deletions
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@ -117,8 +117,11 @@ impl<T: Reflectable> Drop for Trusted<T> {
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assert!(*refcount > 0);
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*refcount -= 1;
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if *refcount == 0 {
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self.script_chan.send(
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ScriptMsg::RefcountCleanup(TrustedReference(self.ptr))).unwrap();
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// It's possible this send will fail if the script task
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// has already exited. There's not much we can do at this
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// point though.
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let msg = ScriptMsg::RefcountCleanup(TrustedReference(self.ptr));
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let _ = self.script_chan.send(msg);
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}
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}
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}
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