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Fix damage tracking for rotated surfaces

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It was broken because the damage extents were rotated about its
own center, not about the center of the surface.

This adds a new wlr_region_rotated_bounds that rotates regions.
This allows us to have only one code path (for both non-rotated
views and rotated views) and optimizes rendering for rotated
views.
This commit is contained in:
emersion 2018-03-26 15:31:08 -04:00
parent bcb74c2c78
commit 4555fc8a54
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GPG key ID: 0FDE7BE0E88F5E48
4 changed files with 76 additions and 26 deletions
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2
include/wlr/types/wlr_box.h
View file

@ -27,7 +27,7 @@ void wlr_box_transform(const struct wlr_box *box,
struct wlr_box *dest);
/**
* Creates the smallest box that contains a rotated box.
* Creates the smallest box that contains the box rotated about its center.
*/
void wlr_box_rotated_bounds(const struct wlr_box *box, float rotation,
struct wlr_box *dest);

7
include/wlr/util/region.h
View file

@ -26,4 +26,11 @@ void wlr_region_transform(pixman_region32_t *dst, pixman_region32_t *src,
void wlr_region_expand(pixman_region32_t *dst, pixman_region32_t *src,
int distance);
/*
* Builds the smallest possible region that contains the region rotated about
* the point (ox, oy).
*/
void wlr_region_rotated_bounds(pixman_region32_t *dst, pixman_region32_t *src,
float rotation, int ox, int oy);
#endif

44
rootston/output.c
View file

@ -486,6 +486,9 @@ static void render_output(struct roots_output *output) {
goto renderer_end;
}
// Uncomment this line to debug damage tracking
//wlr_renderer_clear(renderer, (float[]){1, 1, 0, 0});
int nrects;
pixman_box32_t *rects = pixman_region32_rectangles(&damage, &nrects);
for (int i = 0; i < nrects; ++i) {
@ -667,32 +670,23 @@ static void damage_from_surface(struct wlr_surface *surface,
surface_intersect_output(surface, output->desktop->layout,
wlr_output, lx, ly, rotation, &box);
if (rotation == 0) {
pixman_region32_t damage;
pixman_region32_init(&damage);
pixman_region32_copy(&damage, &surface->current->surface_damage);
wlr_region_scale(&damage, &damage, wlr_output->scale);
if (ceil(wlr_output->scale) > surface->current->scale) {
// When scaling up a surface, it'll become blurry so we need to
// expand the damage region
wlr_region_expand(&damage, &damage,
ceil(wlr_output->scale) - surface->current->scale);
}
pixman_region32_translate(&damage, box.x, box.y);
wlr_output_damage_add(output->damage, &damage);
pixman_region32_fini(&damage);
} else {
pixman_box32_t *extents =
pixman_region32_extents(&surface->current->surface_damage);
struct wlr_box damage_box = {
.x = box.x + extents->x1 * wlr_output->scale,
.y = box.y + extents->y1 * wlr_output->scale,
.width = (extents->x2 - extents->x1) * wlr_output->scale,
.height = (extents->y2 - extents->y1) * wlr_output->scale,
};
wlr_box_rotated_bounds(&damage_box, rotation, &damage_box);
wlr_output_damage_add_box(output->damage, &damage_box);
int center_x = box.x + box.width/2;
int center_y = box.y + box.height/2;
pixman_region32_t damage;
pixman_region32_init(&damage);
pixman_region32_copy(&damage, &surface->current->surface_damage);
wlr_region_scale(&damage, &damage, wlr_output->scale);
if (ceil(wlr_output->scale) > surface->current->scale) {
// When scaling up a surface, it'll become blurry so we need to
// expand the damage region
wlr_region_expand(&damage, &damage,
ceil(wlr_output->scale) - surface->current->scale);
}
pixman_region32_translate(&damage, box.x, box.y);
wlr_region_rotated_bounds(&damage, &damage, rotation, center_x, center_y);
wlr_output_damage_add(output->damage, &damage);
pixman_region32_fini(&damage);
}
void output_damage_from_view(struct roots_output *output,

49
util/region.c
View file

@ -128,3 +128,52 @@ void wlr_region_expand(pixman_region32_t *dst, pixman_region32_t *src,
pixman_region32_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}
void wlr_region_rotated_bounds(pixman_region32_t *dst, pixman_region32_t *src,
float rotation, int ox, int oy) {
if (rotation == 0) {
pixman_region32_copy(dst, src);
return;
}
int nrects;
pixman_box32_t *src_rects = pixman_region32_rectangles(src, &nrects);
pixman_box32_t *dst_rects = malloc(nrects * sizeof(pixman_box32_t));
if (dst_rects == NULL) {
return;
}
for (int i = 0; i < nrects; ++i) {
double x1 = src_rects[i].x1 - ox;
double y1 = src_rects[i].y1 - oy;
double x2 = src_rects[i].x2 - ox;
double y2 = src_rects[i].y2 - oy;
double rx1 = x1 * cos(rotation) - y1 * sin(rotation);
double ry1 = x1 * sin(rotation) + y1 * cos(rotation);
double rx2 = x2 * cos(rotation) - y1 * sin(rotation);
double ry2 = x2 * sin(rotation) + y1 * cos(rotation);
double rx3 = x2 * cos(rotation) - y2 * sin(rotation);
double ry3 = x2 * sin(rotation) + y2 * cos(rotation);
double rx4 = x1 * cos(rotation) - y2 * sin(rotation);
double ry4 = x1 * sin(rotation) + y2 * cos(rotation);
x1 = fmin(fmin(rx1, rx2), fmin(rx3, rx4));
y1 = fmin(fmin(ry1, ry2), fmin(ry3, ry4));
x2 = fmax(fmax(rx1, rx2), fmax(rx3, rx4));
y2 = fmax(fmax(ry1, ry2), fmax(ry3, ry4));
dst_rects[i].x1 = floor(ox + x1);
dst_rects[i].x2 = ceil(ox + x2);
dst_rects[i].y1 = floor(oy + y1);
dst_rects[i].y2 = ceil(oy + y2);
}
pixman_region32_fini(dst);
pixman_region32_init_rects(dst, dst_rects, nrects);
free(dst_rects);
}