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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
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
#ifndef WLR_RENDER_DRM_FORMAT_SET_H
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#define WLR_RENDER_DRM_FORMAT_SET_H
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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/** A single DRM format, with a set of modifiers attached. */
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struct wlr_drm_format {
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// The actual DRM format, from `drm_fourcc.h`
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uint32_t format;
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// The number of modifiers
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size_t len;
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// The capacity of the array; do not use.
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size_t capacity;
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// The actual modifiers
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uint64_t modifiers[];
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};
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/**
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* A set of DRM formats and modifiers.
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*
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* This is used to describe the supported format + modifier combinations. For
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* instance, backends will report the set they can display, and renderers will
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* report the set they can render to. For a more general overview of formats
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* and modifiers, see:
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* https://lore.kernel.org/dri-devel/20210905122742.86029-1-daniels@collabora.com/
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*
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* For compatibility with legacy drivers which don't support explicit
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* modifiers, the special modifier DRM_FORMAT_MOD_INVALID is used to indicate
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* that implicit modifiers are supported. Legacy drivers can also support the
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* DRM_FORMAT_MOD_LINEAR modifier, which forces the buffer to have a linear
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* layout.
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*
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* Users must not assume that implicit modifiers are supported unless INVALID
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* is listed in the modifier list.
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*/
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struct wlr_drm_format_set {
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// The number of formats
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size_t len;
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// The capacity of the array; private to wlroots
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size_t capacity;
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// A pointer to an array of `struct wlr_drm_format *` of length `len`.
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struct wlr_drm_format **formats;
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};
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/**
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* Free all of the DRM formats in the set, making the set empty. Does not
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* free the set itself.
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*/
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void wlr_drm_format_set_finish(struct wlr_drm_format_set *set);
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/**
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* Return a pointer to a member of this `wlr_drm_format_set` of format
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* `format`, or NULL if none exists.
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*/
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const struct wlr_drm_format *wlr_drm_format_set_get(
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const struct wlr_drm_format_set *set, uint32_t format);
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bool wlr_drm_format_set_has(const struct wlr_drm_format_set *set,
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uint32_t format, uint64_t modifier);
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bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
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uint64_t modifier);
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/**
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* Intersect two DRM format sets `a` and `b`, storing in the destination set
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* `dst` the format + modifier pairs which are in both source sets.
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*
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* Returns false on failure or when the intersection is empty.
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*/
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bool wlr_drm_format_set_intersect(struct wlr_drm_format_set *dst,
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const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b);
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#endif
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