98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* This an unstable interface of wlroots. No guarantees are made regarding the
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* future consistency of this API.
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*/
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#ifndef WLR_USE_UNSTABLE
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#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
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#endif
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#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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* Free all resources allocated to this DRM format.
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*/
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void wlr_drm_format_finish(struct wlr_drm_format *format);
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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://www.kernel.org/doc/html/next/userspace-api/dma-buf-alloc-exchange.html#formats-and-modifiers
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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.
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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 struct 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. The `dst`
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* must either be zeroed or initialized with other state to be replaced.
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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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/**
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* Unions DRM format set `a` and `b`, storing in the destination set
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* `dst`. The `dst` must either be zeroed or initialized with other state
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* to be replaced.
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*
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* Returns false on failure.
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*/
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bool wlr_drm_format_set_union(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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