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authorVito Caputo <vcaputo@pengaru.com>2020-09-25 18:47:25 -0700
committerVito Caputo <vcaputo@pengaru.com>2020-09-25 20:54:34 -0700
commitd9db2680298c01a82b768dc19e75bf4f2ef1b56e (patch)
tree1e52d4cbfa4747bc0cb8f405881d5575a0db9b7e /src/libs/txt
parentdb9cc3ab1037ed98d2c6c9dbf44c60d08ca696c2 (diff)
fb: track zeroed state in fb_fragment_t
This adds a bit flag for tracking if the fragment has been zeroed since its last flip/present. When a fresh frame comes back from flipping, its zeroed state is reset to false. When fb_fragment_zero() is called, it checks if zeroed is true, and skips the zeroing if so. If zeroed is false, fb_fragment_zero() will zero the fragment and set the zeroed flag to 1. This change is preparatory for layering the output of modules in a compositing fashion. Not all modules are amenable to being used as upper layers, since they inherently fill the screen with new pixels every frame. Those modules make good bottom or bg layers. Other modules perform fb_fragment_zero() every frame and add relatively few pixels atop a clean slate. These modules make good candidates for upper layers where this change becomes relevant.
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