78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
#ifndef WLR_TYPES_WLR_OUTPUT_DAMAGE_H
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#define WLR_TYPES_WLR_OUTPUT_DAMAGE_H
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#include <pixman.h>
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#include <time.h>
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#include <wlr/types/wlr_output.h>
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/**
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* Damage tracking requires to keep track of previous frames' damage. To allow
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* damage tracking to work with triple buffering, a history of two frames is
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* required.
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*/
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#define WLR_OUTPUT_DAMAGE_PREVIOUS_LEN 2
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/**
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* Tracks damage for an output.
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*
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* When a `frame` event is emitted, `wlr_output_damage_make_current` should be
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* called. If necessary, the output should be repainted and
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* `wlr_output_damage_swap_buffers` should be called. No rendering should happen
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* outside a `frame` event handler.
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*/
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struct wlr_output_damage {
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struct wlr_output *output;
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pixman_region32_t current; // in output-local coordinates
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// circular queue for previous damage
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pixman_region32_t previous[WLR_OUTPUT_DAMAGE_PREVIOUS_LEN];
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size_t previous_idx;
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struct {
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struct wl_signal frame;
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struct wl_signal destroy;
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} events;
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struct wl_listener output_destroy;
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struct wl_listener output_mode;
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struct wl_listener output_transform;
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struct wl_listener output_scale;
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struct wl_listener output_needs_swap;
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struct wl_listener output_frame;
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};
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struct wlr_output_damage *wlr_output_damage_create(struct wlr_output *output);
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void wlr_output_damage_destroy(struct wlr_output_damage *output_damage);
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/**
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* Makes the output rendering context current. `needs_swap` is set to true if
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* `wlr_output_damage_swap_buffers` needs to be called. The region of the output
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* that needs to be repainted is added to `damage`.
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*/
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bool wlr_output_damage_make_current(struct wlr_output_damage *output_damage,
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bool *needs_swap, pixman_region32_t *damage);
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/**
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* Swaps the output buffers. If the time of the frame isn't known, set `when` to
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* NULL.
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*
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* Swapping buffers schedules a `frame` event.
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*/
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bool wlr_output_damage_swap_buffers(struct wlr_output_damage *output_damage,
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struct timespec *when, pixman_region32_t *damage);
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/**
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* Accumulates damage and schedules a `frame` event.
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*/
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void wlr_output_damage_add(struct wlr_output_damage *output_damage,
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pixman_region32_t *damage);
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/**
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* Damages the whole output and schedules a `frame` event.
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*/
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void wlr_output_damage_add_whole(struct wlr_output_damage *output_damage);
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/**
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* Accumulates damage from a box and schedules a `frame` event.
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*/
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void wlr_output_damage_add_box(struct wlr_output_damage *output_damage,
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struct wlr_box *box);
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#endif
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