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output: add wlr_output_is_direct_scanout_allowed()

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This lets compositors check whether direct scan-out is possible.
Compositors will soon be responsible for manually calling this
function.
This commit is contained in:
Simon Ser 2023-04-06 21:41:55 +02:00
parent 835208db98
commit 079ff9e6fb
2 changed files with 27 additions and 0 deletions
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7
include/wlr/types/wlr_output.h
View file

@ -525,6 +525,13 @@ void wlr_output_render_software_cursors(struct wlr_output *output,
*/
const struct wlr_drm_format_set *wlr_output_get_primary_formats(
struct wlr_output *output, uint32_t buffer_caps);
/**
* Check whether direct scan-out is allowed on the output.
*
* Direct scan-out is typically disallowed when there are software cursors or
* during screen capture.
*/
bool wlr_output_is_direct_scanout_allowed(struct wlr_output *output);
struct wlr_output_cursor *wlr_output_cursor_create(struct wlr_output *output);

20
types/output/output.c
View file

@ -1025,3 +1025,23 @@ const struct wlr_drm_format_set *wlr_output_get_primary_formats(
return formats;
}
bool wlr_output_is_direct_scanout_allowed(struct wlr_output *output) {
if (output->attach_render_locks > 0) {
wlr_log(WLR_DEBUG, "Direct scan-out disabled by lock");
return false;
}
// If the output has at least one software cursor, reject direct scan-out
struct wlr_output_cursor *cursor;
wl_list_for_each(cursor, &output->cursors, link) {
if (cursor->enabled && cursor->visible &&
cursor != output->hardware_cursor) {
wlr_log(WLR_DEBUG,
"Direct scan-out disabled by software cursor");
return false;
}
}
return true;
}