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scene: Block damage on single-pixel buffer textures

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We cache whether buffers are single-pixel buffers (and if so what color
they are) to allow rendering optimizations.  But this breaks if the
client changes out the single-pixel buffer for one with a different
color, because this updates the texture in-place instead of actually
changing the buffer.

We can fix this by blocking in-place texture updates for single pixel
buffers.

Original bug: https://codeberg.org/ifreund/waylock/issues/121
See also: !5092

(cherry picked from commit 58c3680d96)
This commit is contained in:
David Turner 2025-06-30 15:45:03 +01:00 • committed by Simon Zeni
parent 68dea55970
commit 5aa8c192a5
1 changed files with 21 additions and 3 deletions
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20
types/scene/surface.c
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@ -96,8 +96,11 @@ static void scene_buffer_unmark_client_buffer(struct wlr_scene_buffer *scene_buf
return;
}
assert(buffer->n_ignore_locks > 0);
// If the buffer was a single-pixel buffer where we cached its color
// then it won't have been marked as damage-allowed.
if (buffer->n_ignore_locks > 0) {
buffer->n_ignore_locks--;
}
}
static int min(int a, int b) {
@ -165,7 +168,22 @@ static void surface_reconfigure(struct wlr_scene_surface *scene_surface) {
scene_buffer_unmark_client_buffer(scene_buffer);
if (surface->buffer) {
// If we've cached the buffer's single-pixel buffer color
// then any in-place updates to the texture wouldn't be
// reflected in rendering. So only allow in-place texture
// updates if it's not a single pixel buffer. Note that we
// can't use the cached scene_buffer->is_single_pixel_buffer
// because that's only set later on.
bool is_single_pixel_buffer = false;
struct wlr_client_buffer *client_buffer = wlr_client_buffer_get(&surface->buffer->base);
if (client_buffer != NULL && client_buffer->source != NULL) {
struct wlr_single_pixel_buffer_v1 *spb =
wlr_single_pixel_buffer_v1_try_from_buffer(client_buffer->source);
is_single_pixel_buffer = spb != NULL;
}
if (!is_single_pixel_buffer) {
client_buffer_mark_next_can_damage(surface->buffer);
}
struct wlr_linux_drm_syncobj_surface_v1_state *syncobj_surface_state =
wlr_linux_drm_syncobj_v1_get_surface_state(surface);