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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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13
src/cycle/osd-classic.c
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@ -9,6 +9,7 @@
#include "common/lab-scene-rect.h"
#include "common/list.h"
#include "common/mem.h"
#include "common/scene-helpers.h"
#include "common/string-helpers.h"
#include "config/rcxml.h"
#include "cycle.h"
@ -108,7 +109,7 @@ cycle_osd_classic_init(struct cycle_osd_output *osd_output)
int h = workspace_name_h + nr_visible_views * switcher_theme->item_height
+ 2 * padding;
osd_output->tree = wlr_scene_tree_create(output->cycle_osd_tree);
osd_output->tree = lab_wlr_scene_tree_create(output->cycle_osd_tree);
float *text_color = theme->osd_label_text_color;
float *bg_color = theme->osd_bg_color;
@ -161,7 +162,7 @@ cycle_osd_classic_init(struct cycle_osd_output *osd_output)
float *active_bg_color = switcher_theme->item_active_bg_color;
float *active_border_color = switcher_theme->item_active_border_color;
osd_output->items_tree = wlr_scene_tree_create(osd_output->tree);
osd_output->items_tree = lab_wlr_scene_tree_create(osd_output->tree);
/* Draw text for each node */
struct view *view;
@ -169,7 +170,7 @@ cycle_osd_classic_init(struct cycle_osd_output *osd_output)
struct cycle_osd_classic_item *item = znew(*item);
wl_list_append(&osd_output->items, &item->base.link);
item->base.view = view;
item->base.tree = wlr_scene_tree_create(osd_output->items_tree);
item->base.tree = lab_wlr_scene_tree_create(osd_output->items_tree);
node_descriptor_create(&item->base.tree->node,
LAB_NODE_CYCLE_OSD_ITEM, NULL, item);
/*
@ -191,8 +192,8 @@ cycle_osd_classic_init(struct cycle_osd_output *osd_output)
int x = padding
+ switcher_theme->item_active_border_width
+ switcher_theme->item_padding_x;
item->normal_tree = wlr_scene_tree_create(item->base.tree);
item->active_tree = wlr_scene_tree_create(item->base.tree);
item->normal_tree = lab_wlr_scene_tree_create(item->base.tree);
item->active_tree = lab_wlr_scene_tree_create(item->base.tree);
wlr_scene_node_set_enabled(&item->active_tree->node, false);
/* Highlight around selected window's item */
@ -209,7 +210,7 @@ cycle_osd_classic_init(struct cycle_osd_output *osd_output)
wlr_scene_node_set_position(&highlight_rect->tree->node, padding, y);
/* hitbox for mouse clicks */
struct wlr_scene_rect *hitbox = wlr_scene_rect_create(item->base.tree,
struct wlr_scene_rect *hitbox = lab_wlr_scene_rect_create(item->base.tree,
w - 2 * padding, switcher_theme->item_height, (float[4]) {0});
wlr_scene_node_set_position(&hitbox->node, padding, y);