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render/drm-format-set: add wlr_drm_format_set_intersect

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This intersects two DRM format sets. This is useful for implementing
DMA-BUF feedback in compositors, see e.g. the Sway PR [1].

[1]: https://github.com/swaywm/sway/pull/6313
This commit is contained in:
Simon Ser 2021-12-01 13:35:50 +01:00 • committed by Simon Zeni
parent 92080b3a01
commit 7201aae3d6
2 changed files with 47 additions and 0 deletions
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9
include/wlr/render/drm_format_set.h
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@ -63,4 +63,13 @@ bool wlr_drm_format_set_has(const struct wlr_drm_format_set *set,
bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
uint64_t modifier);
/**
* Intersect two DRM format sets `a` and `b`, storing in the destination set
* `dst` the format + modifier pairs which are in both source sets.
*
* Returns false on failure or when the intersection is empty.
*/
bool wlr_drm_format_set_intersect(struct wlr_drm_format_set *dst,
const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b);
#endif