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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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15
src/common/lab-scene-rect.c
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@ -3,6 +3,7 @@
#include <assert.h>
#include <wlr/types/wlr_scene.h>
#include "common/mem.h"
#include "common/scene-helpers.h"
struct border_scene {
struct wlr_scene_tree *tree;
@ -26,20 +27,20 @@ lab_scene_rect_create(struct wlr_scene_tree *parent,
rect->border_width = opts->border_width;
rect->nr_borders = opts->nr_borders;
rect->borders = znew_n(rect->borders[0], opts->nr_borders);
rect->tree = wlr_scene_tree_create(parent);
rect->tree = lab_wlr_scene_tree_create(parent);
if (opts->bg_color) {
rect->fill = wlr_scene_rect_create(rect->tree, 0, 0, opts->bg_color);
rect->fill = lab_wlr_scene_rect_create(rect->tree, 0, 0, opts->bg_color);
}
for (int i = 0; i < rect->nr_borders; i++) {
struct border_scene *border = &rect->borders[i];
float *color = opts->border_colors[i];
border->tree = wlr_scene_tree_create(rect->tree);
border->top = wlr_scene_rect_create(border->tree, 0, 0, color);
border->right = wlr_scene_rect_create(border->tree, 0, 0, color);
border->bottom = wlr_scene_rect_create(border->tree, 0, 0, color);
border->left = wlr_scene_rect_create(border->tree, 0, 0, color);
border->tree = lab_wlr_scene_tree_create(rect->tree);
border->top = lab_wlr_scene_rect_create(border->tree, 0, 0, color);
border->right = lab_wlr_scene_rect_create(border->tree, 0, 0, color);
border->bottom = lab_wlr_scene_rect_create(border->tree, 0, 0, color);
border->left = lab_wlr_scene_rect_create(border->tree, 0, 0, color);
}
rect->node_destroy.notify = handle_node_destroy;