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render: handle containers without output when rendering titles

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In e0a94bee8d, it was believed that if the
container is being rendered, it must have an output.

This turned out not to be the case. When rendering a container, all its
children are rendered, even if the children is positioned off screen and
thus not having any output. This is the cause of the crash in #6061.

This commit introduces a null-check, which fixes #6061.
This commit is contained in:
Quantum 2021-02-24 15:15:22 -05:00 committed by Tudor Brindus
parent bb41b7b814
commit e01a3c85f6
2 changed files with 6 additions and 1 deletions
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1
include/sway/tree/container.h
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@ -285,6 +285,7 @@ bool container_is_fullscreen_or_child(struct sway_container *container);
/**
* Return the output which will be used for scale purposes.
* This is the most recently entered output.
* If the container is not on any output, return NULL.
*/
struct sway_output *container_get_effective_output(struct sway_container *con);

6
sway/desktop/render.c
View file

@ -519,7 +519,11 @@ static void render_titlebar(struct sway_output *output,
wlr_texture_get_size(title_texture,
&texture_box.width, &texture_box.height);
float title_scale = container_get_effective_output(con)->wlr_output->scale;
// The effective output may be NULL when con is not on any output.
// This can happen because we render all children of containers,
// even those that are out of the bounds of any output.
struct sway_output *effective = container_get_effective_output(con);
float title_scale = effective ? effective->wlr_output->scale : output_scale;
texture_box.width = texture_box.width * output_scale / title_scale;
texture_box.height = texture_box.height * output_scale / title_scale;
ob_title_width = texture_box.width;