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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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12
src/ssd/ssd-titlebar.c
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@ -7,7 +7,7 @@
#include <wlr/types/wlr_scene.h>
#include "buffer.h"
#include "common/mem.h"
#include "common/string-helpers.h"
#include "common/scene-helpers.h"
#include "config/rcxml.h"
#include "labwc.h"
#include "node.h"
@ -31,14 +31,14 @@ ssd_titlebar_create(struct ssd *ssd)
int width = view->current.width;
int corner_width = ssd_get_corner_width();
ssd->titlebar.tree = wlr_scene_tree_create(ssd->tree);
ssd->titlebar.tree = lab_wlr_scene_tree_create(ssd->tree);
node_descriptor_create(&ssd->titlebar.tree->node,
LAB_NODE_TITLEBAR, view, /*data*/ NULL);
enum ssd_active_state active;
FOR_EACH_ACTIVE_STATE(active) {
struct ssd_titlebar_subtree *subtree = &ssd->titlebar.subtrees[active];
subtree->tree = wlr_scene_tree_create(ssd->titlebar.tree);
subtree->tree = lab_wlr_scene_tree_create(ssd->titlebar.tree);
struct wlr_scene_tree *parent = subtree->tree;
wlr_scene_node_set_enabled(&parent->node, active);
wlr_scene_node_set_position(&parent->node, 0, -theme->titlebar_height);
@ -51,7 +51,7 @@ ssd_titlebar_create(struct ssd *ssd)
&theme->window[active].corner_top_right_normal->base;
/* Background */
subtree->bar = wlr_scene_buffer_create(parent, titlebar_fill);
subtree->bar = lab_wlr_scene_buffer_create(parent, titlebar_fill);
/*
* Work around the wlroots/pixman bug that widened 1px buffer
* becomes translucent when bilinear filtering is used.
@ -64,11 +64,11 @@ ssd_titlebar_create(struct ssd *ssd)
}
wlr_scene_node_set_position(&subtree->bar->node, corner_width, 0);
subtree->corner_left = wlr_scene_buffer_create(parent, corner_top_left);
subtree->corner_left = lab_wlr_scene_buffer_create(parent, corner_top_left);
wlr_scene_node_set_position(&subtree->corner_left->node,
-rc.theme->border_width, -rc.theme->border_width);
subtree->corner_right = wlr_scene_buffer_create(parent, corner_top_right);
subtree->corner_right = lab_wlr_scene_buffer_create(parent, corner_top_right);
wlr_scene_node_set_position(&subtree->corner_right->node,
width - corner_width, -rc.theme->border_width);