Commits on Jul 5, 2018

1. Apply dirty rect updates consistently. …

   This patch moves the dirty rect storage from ImageResource to
   CachedImageInfo. This is because cache entries may be updated
   independently across frame updates, and thus cannot share the dirty rect
   state.
   
   We no longer clear the dirty rect when we get an update without a dirty
   rect. This is because we can get a subsequent update (before applying
   the previous) which provides a new dirty rect, and we still want to
   reupload the whole image. Instead we now store a dirty rect for the
   whole descriptor.
   
   In addition to special handling for tiled requests, we also properly
   handle requests which change the ImageRendering type. Before we would
   take the dirty rect for the first request and ignore it for the rest.

   

   aosmond committed Jul 5, 2018
   27bc98b

2. Refactor image cache to avoid scanning the whole cache when updating … …

   …tiled images.
   
   ImageCache is now represented as an enum with three types:
   - Err, as before.
   
   - UntiledAuto, the fast path for untiled images using ImageRendering::Auto,
   which contains a CachedImageInfo.
   
   - Multi, the slower path used for tiled images or images that use other
   ImageRendering types, which stores a hash map containing CachedImageInfo
   objects for all of the variants/subsections of the image.

   

   aosmond committed Jul 5, 2018
   58a5c07

3. Remove epoch from ImageResource as unused.

   

   aosmond committed Jul 5, 2018

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