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scene: configure clients with the highest output scale

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If a surface appears on two outputs with the same intersection
area, or even if a surface appears on an output with a small
intersection area, we want to use the highest scale.

Fixes flip-flop when a surface is added to multiple scenes.

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3901
This commit is contained in:
Simon Ser 2025-06-05 11:36:39 +02:00 • committed by Kenny Levinsen
parent 95b2771bfd
commit 8713ac72fb
1 changed files with 17 additions and 6 deletions
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19
types/scene/surface.c
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@ -11,19 +11,30 @@
#include <wlr/util/transform.h>
#include "types/wlr_scene.h"
static double get_surface_preferred_buffer_scale(struct wlr_surface *surface) {
double scale = 1;
struct wlr_surface_output *surface_output;
wl_list_for_each(surface_output, &surface->current_outputs, link) {
if (surface_output->output->scale > scale) {
scale = surface_output->output->scale;
}
}
return scale;
}
static void handle_scene_buffer_outputs_update(
struct wl_listener *listener, void *data) {
struct wlr_scene_surface *surface =
wl_container_of(listener, surface, outputs_update);
if (surface->buffer->primary_output == NULL) {
return;
}
double scale = surface->buffer->primary_output->output->scale;
double scale = get_surface_preferred_buffer_scale(surface->surface);
wlr_fractional_scale_v1_notify_scale(surface->surface, scale);
wlr_surface_set_preferred_buffer_scale(surface->surface, ceil(scale));
if (surface->buffer->primary_output != NULL) {
wlr_surface_set_preferred_buffer_transform(surface->surface,
surface->buffer->primary_output->output->transform);
}
}
static void handle_scene_buffer_output_enter(