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Refactored image cache task - details below.

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* 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.
This commit is contained in:
Glenn Watson 2015-04-20 13:34:26 +10:00
parent e278e5b9a2
commit d8aef7208e
33 changed files with 2785 additions and 1679 deletions
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2
components/compositing/constellation.rs
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@ -21,7 +21,7 @@ use msg::constellation_msg::{Key, KeyState, KeyModifiers, LoadData};
use msg::constellation_msg::{SubpageId, WindowSizeData};
use msg::constellation_msg::{self, ConstellationChan, Failure};
use net_traits::{self, ResourceTask};
use net_traits::image_cache_task::{ImageCacheTask, ImageCacheTaskClient};
use net_traits::image_cache_task::ImageCacheTask;
use net_traits::storage_task::{StorageTask, StorageTaskMsg};
use profile::mem;
use profile::time;