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https://github.com/hyprwm/wlroots-hyprland.git
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types: add wlr_damage_ring
wlr_damage_ring is effectively wlr_output_damage untied from wlr_output.
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3 changed files with 195 additions and 0 deletions
81
include/wlr/types/wlr_damage_ring.h
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81
include/wlr/types/wlr_damage_ring.h
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/*
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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_TYPES_WLR_DAMAGE_RING_H
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#define WLR_TYPES_WLR_DAMAGE_RING_H
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#include <stdbool.h>
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/* For triple buffering, a history of two frames is required. */
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#define WLR_DAMAGE_RING_PREVIOUS_LEN 2
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struct wlr_box;
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struct wlr_damage_ring {
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int32_t width, height;
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// Difference between the current buffer and the previous one
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pixman_region32_t current;
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// private state
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pixman_region32_t previous[WLR_DAMAGE_RING_PREVIOUS_LEN];
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size_t previous_idx;
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};
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void wlr_damage_ring_init(struct wlr_damage_ring *ring);
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void wlr_damage_ring_finish(struct wlr_damage_ring *ring);
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/**
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* Set ring bounds and damage the ring fully.
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*
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* Next time damage will be added, it will be cropped to the ring bounds.
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* If at least one of the dimensions is 0, bounds are removed.
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*
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* By default, a damage ring doesn't have bounds.
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*/
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void wlr_damage_ring_set_bounds(struct wlr_damage_ring *ring,
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int32_t width, int32_t height);
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/**
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* Add a region to the current damage.
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*
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* Returns true if the region intersects the ring bounds, false otherwise.
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*/
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bool wlr_damage_ring_add(struct wlr_damage_ring *ring,
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pixman_region32_t *damage);
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/**
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* Add a box to the current damage.
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*
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* Returns true if the box intersects the ring bounds, false otherwise.
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*/
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bool wlr_damage_ring_add_box(struct wlr_damage_ring *ring,
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const struct wlr_box *box);
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/**
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* Damage the ring fully.
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*/
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void wlr_damage_ring_add_whole(struct wlr_damage_ring *ring);
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/**
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* Rotate the damage ring. This needs to be called after using the accumulated
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* damage, e.g. after rendering to an output's back buffer.
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*/
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void wlr_damage_ring_rotate(struct wlr_damage_ring *ring);
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/**
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* Get accumulated damage, which is the difference between the current buffer
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* and the buffer with age of buffer_age; in context of rendering, this is
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* the region that needs to be redrawn.
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*/
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void wlr_damage_ring_get_buffer_damage(struct wlr_damage_ring *ring,
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int buffer_age, pixman_region32_t *damage);
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#endif
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@ -30,6 +30,7 @@ wlr_files += files(
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'wlr_buffer.c',
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'wlr_compositor.c',
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'wlr_cursor.c',
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'wlr_damage_ring.c',
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'wlr_data_control_v1.c',
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'wlr_drm.c',
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'wlr_export_dmabuf_v1.c',
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113
types/wlr_damage_ring.c
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113
types/wlr_damage_ring.c
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pixman.h>
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#include <wlr/types/wlr_damage_ring.h>
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#include <wlr/util/box.h>
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#include "util/signal.h"
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#define WLR_DAMAGE_RING_MAX_RECTS 20
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void wlr_damage_ring_init(struct wlr_damage_ring *ring) {
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memset(ring, 0, sizeof(*ring));
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ring->width = INT_MAX;
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ring->height = INT_MAX;
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pixman_region32_init(&ring->current);
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for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {
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pixman_region32_init(&ring->previous[i]);
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}
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}
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void wlr_damage_ring_finish(struct wlr_damage_ring *ring) {
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pixman_region32_fini(&ring->current);
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for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {
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pixman_region32_fini(&ring->previous[i]);
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}
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}
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void wlr_damage_ring_set_bounds(struct wlr_damage_ring *ring,
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int32_t width, int32_t height) {
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if (width == 0 || height == 0) {
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ring->width = INT_MAX;
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ring->height = INT_MAX;
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} else {
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ring->width = width;
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ring->height = height;
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}
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wlr_damage_ring_add_whole(ring);
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}
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bool wlr_damage_ring_add(struct wlr_damage_ring *ring,
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pixman_region32_t *damage) {
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pixman_region32_t clipped;
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pixman_region32_init(&clipped);
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pixman_region32_intersect_rect(&clipped, damage,
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0, 0, ring->width, ring->height);
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bool intersects = pixman_region32_not_empty(&clipped);
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if (intersects) {
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pixman_region32_union(&ring->current, &ring->current, &clipped);
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}
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pixman_region32_fini(&clipped);
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return intersects;
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}
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bool wlr_damage_ring_add_box(struct wlr_damage_ring *ring,
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const struct wlr_box *box) {
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struct wlr_box clipped = {
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.x = 0,
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.y = 0,
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.width = ring->width,
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.height = ring->height,
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};
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if (wlr_box_intersection(&clipped, &clipped, box)) {
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pixman_region32_union_rect(&ring->current,
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&ring->current, clipped.x, clipped.y,
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clipped.width, clipped.height);
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return true;
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}
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return false;
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}
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void wlr_damage_ring_add_whole(struct wlr_damage_ring *ring) {
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pixman_region32_union_rect(&ring->current,
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&ring->current, 0, 0, ring->width, ring->height);
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}
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void wlr_damage_ring_rotate(struct wlr_damage_ring *ring) {
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// modular decrement
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ring->previous_idx = ring->previous_idx +
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WLR_DAMAGE_RING_PREVIOUS_LEN - 1;
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ring->previous_idx %= WLR_DAMAGE_RING_PREVIOUS_LEN;
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pixman_region32_copy(&ring->previous[ring->previous_idx], &ring->current);
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pixman_region32_clear(&ring->current);
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}
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void wlr_damage_ring_get_buffer_damage(struct wlr_damage_ring *ring,
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int buffer_age, pixman_region32_t *damage) {
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if (buffer_age <= 0 || buffer_age - 1 > WLR_DAMAGE_RING_PREVIOUS_LEN) {
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pixman_region32_clear(damage);
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pixman_region32_union_rect(damage, damage,
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0, 0, ring->width, ring->height);
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} else {
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pixman_region32_copy(damage, &ring->current);
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// Accumulate damage from old buffers
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for (int i = 0; i < buffer_age - 1; ++i) {
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int j = (ring->previous_idx + i) % WLR_DAMAGE_RING_PREVIOUS_LEN;
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pixman_region32_union(damage, damage, &ring->previous[j]);
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}
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// Check the number of rectangles
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int n_rects = pixman_region32_n_rects(damage);
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if (n_rects > WLR_DAMAGE_RING_MAX_RECTS) {
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pixman_box32_t *extents = pixman_region32_extents(damage);
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pixman_region32_union_rect(damage, damage,
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extents->x1, extents->y1,
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extents->x2 - extents->x1,
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extents->y2 - extents->y1);
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}
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}
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}
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