types: add wlr_damage_ring

wlr_damage_ring is effectively wlr_output_damage untied from wlr_output.
This commit is contained in:
Kirill Primak 2022-04-30 08:55:16 +03:00
parent 10a821a87d
commit e0accb2d50
3 changed files with 195 additions and 0 deletions

View file

@ -0,0 +1,81 @@
/*
* 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_TYPES_WLR_DAMAGE_RING_H
#define WLR_TYPES_WLR_DAMAGE_RING_H
#include <stdbool.h>
/* For triple buffering, a history of two frames is required. */
#define WLR_DAMAGE_RING_PREVIOUS_LEN 2
struct wlr_box;
struct wlr_damage_ring {
int32_t width, height;
// Difference between the current buffer and the previous one
pixman_region32_t current;
// private state
pixman_region32_t previous[WLR_DAMAGE_RING_PREVIOUS_LEN];
size_t previous_idx;
};
void wlr_damage_ring_init(struct wlr_damage_ring *ring);
void wlr_damage_ring_finish(struct wlr_damage_ring *ring);
/**
* Set ring bounds and damage the ring fully.
*
* Next time damage will be added, it will be cropped to the ring bounds.
* If at least one of the dimensions is 0, bounds are removed.
*
* By default, a damage ring doesn't have bounds.
*/
void wlr_damage_ring_set_bounds(struct wlr_damage_ring *ring,
int32_t width, int32_t height);
/**
* Add a region to the current damage.
*
* Returns true if the region intersects the ring bounds, false otherwise.
*/
bool wlr_damage_ring_add(struct wlr_damage_ring *ring,
pixman_region32_t *damage);
/**
* Add a box to the current damage.
*
* Returns true if the box intersects the ring bounds, false otherwise.
*/
bool wlr_damage_ring_add_box(struct wlr_damage_ring *ring,
const struct wlr_box *box);
/**
* Damage the ring fully.
*/
void wlr_damage_ring_add_whole(struct wlr_damage_ring *ring);
/**
* Rotate the damage ring. This needs to be called after using the accumulated
* damage, e.g. after rendering to an output's back buffer.
*/
void wlr_damage_ring_rotate(struct wlr_damage_ring *ring);
/**
* Get accumulated damage, which is the difference between the current buffer
* and the buffer with age of buffer_age; in context of rendering, this is
* the region that needs to be redrawn.
*/
void wlr_damage_ring_get_buffer_damage(struct wlr_damage_ring *ring,
int buffer_age, pixman_region32_t *damage);
#endif

View file

@ -30,6 +30,7 @@ wlr_files += files(
'wlr_buffer.c',
'wlr_compositor.c',
'wlr_cursor.c',
'wlr_damage_ring.c',
'wlr_data_control_v1.c',
'wlr_drm.c',
'wlr_export_dmabuf_v1.c',

113
types/wlr_damage_ring.c Normal file
View file

@ -0,0 +1,113 @@
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <pixman.h>
#include <wlr/types/wlr_damage_ring.h>
#include <wlr/util/box.h>
#include "util/signal.h"
#define WLR_DAMAGE_RING_MAX_RECTS 20
void wlr_damage_ring_init(struct wlr_damage_ring *ring) {
memset(ring, 0, sizeof(*ring));
ring->width = INT_MAX;
ring->height = INT_MAX;
pixman_region32_init(&ring->current);
for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {
pixman_region32_init(&ring->previous[i]);
}
}
void wlr_damage_ring_finish(struct wlr_damage_ring *ring) {
pixman_region32_fini(&ring->current);
for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {
pixman_region32_fini(&ring->previous[i]);
}
}
void wlr_damage_ring_set_bounds(struct wlr_damage_ring *ring,
int32_t width, int32_t height) {
if (width == 0 || height == 0) {
ring->width = INT_MAX;
ring->height = INT_MAX;
} else {
ring->width = width;
ring->height = height;
}
wlr_damage_ring_add_whole(ring);
}
bool wlr_damage_ring_add(struct wlr_damage_ring *ring,
pixman_region32_t *damage) {
pixman_region32_t clipped;
pixman_region32_init(&clipped);
pixman_region32_intersect_rect(&clipped, damage,
0, 0, ring->width, ring->height);
bool intersects = pixman_region32_not_empty(&clipped);
if (intersects) {
pixman_region32_union(&ring->current, &ring->current, &clipped);
}
pixman_region32_fini(&clipped);
return intersects;
}
bool wlr_damage_ring_add_box(struct wlr_damage_ring *ring,
const struct wlr_box *box) {
struct wlr_box clipped = {
.x = 0,
.y = 0,
.width = ring->width,
.height = ring->height,
};
if (wlr_box_intersection(&clipped, &clipped, box)) {
pixman_region32_union_rect(&ring->current,
&ring->current, clipped.x, clipped.y,
clipped.width, clipped.height);
return true;
}
return false;
}
void wlr_damage_ring_add_whole(struct wlr_damage_ring *ring) {
pixman_region32_union_rect(&ring->current,
&ring->current, 0, 0, ring->width, ring->height);
}
void wlr_damage_ring_rotate(struct wlr_damage_ring *ring) {
// modular decrement
ring->previous_idx = ring->previous_idx +
WLR_DAMAGE_RING_PREVIOUS_LEN - 1;
ring->previous_idx %= WLR_DAMAGE_RING_PREVIOUS_LEN;
pixman_region32_copy(&ring->previous[ring->previous_idx], &ring->current);
pixman_region32_clear(&ring->current);
}
void wlr_damage_ring_get_buffer_damage(struct wlr_damage_ring *ring,
int buffer_age, pixman_region32_t *damage) {
if (buffer_age <= 0 || buffer_age - 1 > WLR_DAMAGE_RING_PREVIOUS_LEN) {
pixman_region32_clear(damage);
pixman_region32_union_rect(damage, damage,
0, 0, ring->width, ring->height);
} else {
pixman_region32_copy(damage, &ring->current);
// Accumulate damage from old buffers
for (int i = 0; i < buffer_age - 1; ++i) {
int j = (ring->previous_idx + i) % WLR_DAMAGE_RING_PREVIOUS_LEN;
pixman_region32_union(damage, damage, &ring->previous[j]);
}
// Check the number of rectangles
int n_rects = pixman_region32_n_rects(damage);
if (n_rects > WLR_DAMAGE_RING_MAX_RECTS) {
pixman_box32_t *extents = pixman_region32_extents(damage);
pixman_region32_union_rect(damage, damage,
extents->x1, extents->y1,
extents->x2 - extents->x1,
extents->y2 - extents->y1);
}
}
}