зеркало из https://github.com/mozilla/gecko-dev.git
5b8c7d826e
KHR_partial_update allows us to avoid rerendering the entire backbuffer every frame, and instead only render what has changed on the current frame, as well as the difference between the current backbuffer and the current frontbuffer. It works similarily to EXT_buffer_age, which we already support, with the additional requirement that we must call eglSetDamageRegion each frame before rendering to the backbuffer. Modify GLContextEGL::GetBufferAge() so that it queries the age if either EXT_buffer_age or KHR_partial_update are available. This will now automatically be queried by webrender through the PartialPresentCompositor trait. Add a new function to that trait, set_buffer_damage_region(), whose RenderCompositorEGL implementation calls eglSetDamageRegion(). Call this from composite_simple(), once the damage rect has been calculated but before rendering to the backbuffer. Additionally, change both RenderCompositorEGL and RenderCompositorOGL's implementations of ShouldDrawPreviousPartialPresentRegions() to unconditionally return true, rather than checking for the existence of EXT_buffer_age (or adding a new check for KHR_partial_update). The lack of these extensions does not mean that webrender is able to skip rendering previous frames' damage. Rather the opposite, it means we cannot render *only* the previous frames' damage, and must instead always render the entire buffer. Differential Revision: https://phabricator.services.mozilla.com/D91203 |
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