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/*
* This an unstable interface of wlroots. No guarantees are made regarding the
* future consistency of this API.
*/
#ifndef WLR_USE_UNSTABLE
#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
#endif
#ifndef WLR_RENDER_DRM_FORMAT_SET_H
#define WLR_RENDER_DRM_FORMAT_SET_H
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/** A single DRM format, with a set of modifiers attached. */
struct wlr_drm_format {
// The actual DRM format, from `drm_fourcc.h`
uint32_t format;
// The number of modifiers
size_t len;
// The capacity of the array; do not use.
size_t capacity;
// The actual modifiers
uint64_t *modifiers;
};
/**
* Free all resources allocated to this DRM format.
*/
void wlr_drm_format_finish(struct wlr_drm_format *format);
/**
* A set of DRM formats and modifiers.
*
* This is used to describe the supported format + modifier combinations. For
* instance, backends will report the set they can display, and renderers will
* report the set they can render to. For a more general overview of formats
* and modifiers, see:
* https://www.kernel.org/doc/html/next/userspace-api/dma-buf-alloc-exchange.html#formats-and-modifiers
*
* For compatibility with legacy drivers which don't support explicit
* modifiers, the special modifier DRM_FORMAT_MOD_INVALID is used to indicate
* that implicit modifiers are supported. Legacy drivers can also support the
* DRM_FORMAT_MOD_LINEAR modifier, which forces the buffer to have a linear
* layout.
*
* Users must not assume that implicit modifiers are supported unless INVALID
* is listed in the modifier list.
*/
struct wlr_drm_format_set {
// The number of formats
size_t len;
// The capacity of the array; private to wlroots
size_t capacity;
// A pointer to an array of `struct wlr_drm_format *` of length `len`.
struct wlr_drm_format *formats;
};
/**
* Free all of the DRM formats in the set, making the set empty.
*/
void wlr_drm_format_set_finish(struct wlr_drm_format_set *set);
/**
* Return a pointer to a member of this struct wlr_drm_format_set of format
* `format`, or NULL if none exists.
*/
const struct wlr_drm_format *wlr_drm_format_set_get(
const struct wlr_drm_format_set *set, uint32_t format);
bool wlr_drm_format_set_remove(struct wlr_drm_format_set *set, uint32_t format,
uint64_t modifier);
bool wlr_drm_format_set_has(const struct wlr_drm_format_set *set,
uint32_t format, uint64_t modifier);
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. The `dst`
* must either be zeroed or initialized with other state to be replaced.
*
* 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);
/**
* Unions DRM format set `a` and `b`, storing in the destination set
* `dst`. The `dst` must either be zeroed or initialized with other state
* to be replaced.
*
* Returns false on failure.
*/
bool wlr_drm_format_set_union(struct wlr_drm_format_set *dst,
const struct wlr_drm_format_set *a, const struct wlr_drm_format_set *b);
#endif
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