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Previously, the setup_picture_caching function was hard coded to support only a very specific shape of display list. With this change, flags are added to PrimitiveCluster that can specify if a picture cache slice should be created before / after this cluster when picture caching is set up. The usage of these flags in this patch matches the old behaviour, so should not have any functional effect. However, in future we will make use of this functionality to create picture slices for a number of different use cases, such as: * Creating cache tiles for the UI. * Slicing the scene where there are video elements, in order to allow these to be composited directly by the OS. This may also apply to WebGL and/or canvas elements. * Slicing the scene when there is a very large fixed position background image or other element, to avoid invalidating the entire tile cache each frame. Differential Revision: https://phabricator.services.mozilla.com/D46125 --HG-- extra : moz-landing-system : lando |
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