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tree-wide: use die_if_null() for wlr_scene alloc failures
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wlr_scene_*_create() functions all allocate memory via calloc() and
return NULL if the allocation fails. Previously, the failures were
handled in any of 3 different ways:

 - sending a wayland protocol error
 - exiting labwc with an error
 - segfault (no NULL check at all)

Since labwc does not attempt to survive heap exhaustion in other
allocation paths (such as `znew`), it seems more consistent to use the
same die_if_null() check used in those paths to exit with an error.

For the three most common create() functions (tree, rect, buffer),
add small lab_wlr_ wrappers to common/scene-helpers.
This commit is contained in:
John Lindgren 2026-02-23 16:34:36 -05:00 • committed by Johan Malm
parent c4effef0ec
commit 16c5373be5
27 changed files with 155 additions and 141 deletions
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11
src/cycle/osd-thumbnail.c
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@ -10,6 +10,7 @@
#include "common/lab-scene-rect.h"
#include "common/list.h"
#include "common/mem.h"
#include "common/scene-helpers.h"
#include "cycle.h"
#include "labwc.h"
#include "node.h"
@ -138,7 +139,7 @@ create_item_scene(struct wlr_scene_tree *parent, struct view *view,
struct cycle_osd_thumbnail_item *item = znew(*item);
wl_list_append(&osd_output->items, &item->base.link);
struct wlr_scene_tree *tree = wlr_scene_tree_create(parent);
struct wlr_scene_tree *tree = lab_wlr_scene_tree_create(parent);
node_descriptor_create(&tree->node, LAB_NODE_CYCLE_OSD_ITEM, NULL, item);
item->base.tree = tree;
item->base.view = view;
@ -155,14 +156,14 @@ create_item_scene(struct wlr_scene_tree *parent, struct view *view,
item->active_bg = lab_scene_rect_create(tree, &opts);
/* hitbox for mouse clicks */
wlr_scene_rect_create(tree, switcher_theme->item_width,
lab_wlr_scene_rect_create(tree, switcher_theme->item_width,
switcher_theme->item_height, (float[4]) {0});
/* thumbnail */
struct wlr_buffer *thumb_buffer = render_thumb(osd_output->output, view);
if (thumb_buffer) {
struct wlr_scene_buffer *thumb_scene_buffer =
wlr_scene_buffer_create(tree, thumb_buffer);
lab_wlr_scene_buffer_create(tree, thumb_buffer);
wlr_buffer_drop(thumb_buffer);
struct wlr_box thumb_box = box_fit_within(
thumb_buffer->width, thumb_buffer->height,
@ -239,8 +240,8 @@ cycle_osd_thumbnail_init(struct cycle_osd_output *osd_output)
&theme->osd_window_switcher_thumbnail;
int padding = theme->osd_border_width + switcher_theme->padding;
osd_output->tree = wlr_scene_tree_create(output->cycle_osd_tree);
osd_output->items_tree = wlr_scene_tree_create(osd_output->tree);
osd_output->tree = lab_wlr_scene_tree_create(output->cycle_osd_tree);
osd_output->items_tree = lab_wlr_scene_tree_create(osd_output->tree);
int nr_views = wl_list_length(&server->cycle.views);
assert(nr_views > 0);