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Wayland: Add SDL_HINT_VIDEO_WAYLAND_PREFER_LIBDECOR

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This hint allows libdecor to be used even when xdg-decoration is
available. It's mostly useful for debugging libdecor, but could in
theory be used by applications which want to (for example) bundle their
own libdecor plugins.
This commit is contained in:
David Gow 2022-04-12 15:23:22 +08:00 committed by Ethan Lee
parent 99ae6395b1
commit 9c2f46b0d5
2 changed files with 38 additions and 1 deletions
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14
include/SDL_hints.h
View file

@ -1475,6 +1475,20 @@ extern "C" {
*/
#define SDL_HINT_VIDEO_WAYLAND_ALLOW_LIBDECOR "SDL_VIDEO_WAYLAND_ALLOW_LIBDECOR"
/**
* \brief A variable controlling whether the libdecor Wayland backend is preferred over native decrations.
*
* When this hint is set, libdecor will be used to provide window decorations, even if xdg-decoration is
* available. (Note that, by default, libdecor will use xdg-decoration itself if available).
*
* This variable can be set to the following values:
* "0" - libdecor is enabled only if server-side decorations are unavailable.
* "1" - libdecor is always enabled if available.
*
* libdecor is used over xdg-shell when xdg-decoration protocol is unavailable.
*/
#define SDL_HINT_VIDEO_WAYLAND_PREFER_LIBDECOR "SDL_VIDEO_WAYLAND_PREFER_LIBDECOR"
/**
* \brief A variable that is the address of another SDL_Window* (as a hex string formatted with "%p").
*

25
src/video/wayland/SDL_waylandvideo.c
View file

@ -876,6 +876,29 @@ static const struct wl_registry_listener registry_listener = {
display_handle_global,
display_remove_global
};
#ifdef HAVE_LIBDECOR_H
static SDL_bool should_use_libdecor(SDL_VideoData *data)
{
if (!SDL_WAYLAND_HAVE_WAYLAND_LIBDECOR) {
return SDL_FALSE;
}
if (!SDL_GetHintBoolean(SDL_HINT_VIDEO_WAYLAND_ALLOW_LIBDECOR, SDL_TRUE)) {
return SDL_FALSE;
}
if (SDL_GetHintBoolean(SDL_HINT_VIDEO_WAYLAND_PREFER_LIBDECOR, SDL_FALSE)) {
return SDL_TRUE;
}
if (data->decoration_manager) {
return SDL_FALSE;
}
return SDL_TRUE;
}
#endif
int
Wayland_VideoInit(_THIS)
@ -899,7 +922,7 @@ Wayland_VideoInit(_THIS)
#ifdef HAVE_LIBDECOR_H
/* Don't have server-side decorations? Try client-side instead. */
if (!data->decoration_manager && SDL_WAYLAND_HAVE_WAYLAND_LIBDECOR && SDL_GetHintBoolean(SDL_HINT_VIDEO_WAYLAND_ALLOW_LIBDECOR, SDL_TRUE)) {
if (should_use_libdecor(data)) {
data->shell.libdecor = libdecor_new(data->display, &libdecor_interface);
/* If libdecor works, we don't need xdg-shell anymore. */