Commits on Apr 16, 2018

1. Various render task refactors to help with upcoming caching changes. …

   * request_render_task() now returns a handle to a render task
     cache entry, rather than an allocated texture cache item. This
     is more in line with how normal texture cache request work.
   
   * Allows the allocation to happen later in the frame (for example
     if the exact render task size is not yet known).
   
   * Allows storing more information about a cached render task
     than what a texture cache item stores (for example, a specific
     blend mode that is required).
   
   * Allows batching code to cheaply look up a cached render task
     entry by using a freelist instead of a hashmap. This will become
     more important as we start to cache render tasks that have
     larger / more complex cache keys.
   
   * Add an extra type parameter to freelist.rs to allow using a custom
     marker type. This avoids rustc errors related to Send or Sync
     not being implemented on free list handles with !Send or !Sync
     phantom data types.
   
   * Allow the size of a render task to be set to None initially, if
     it is not known.
   
   * Add a new render task call (prepare_for_render) which can be used
     by render tasks to prepare tasks that rely on glyphs and/or images
     in the resource cache to be resolved first. This can also be used
     to set the size of a render task before render target allocation,
     if the render task size is not known during initial visibility pass.

   

   gw3583 committed Apr 16, 2018

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