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wayland: Set/unset the opaque regions on surfaces when transparency is toggled

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Caches the SDL_HINT_VIDEO_EGL_ALLOW_TRANSPARENCY hint at init time and registers a callback, which is fired when the hint is changed during runtime and toggles the opaque region for existing surfaces.
This commit is contained in:
Frank Praznik
2022-10-04 12:59:26 -04:00
committed by Ethan Lee
parent ea5958009c
commit c2b0c41c0a
4 changed files with 50 additions and 7 deletions
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51
src/video/wayland/SDL_waylandwindow.c
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@@ -32,6 +32,7 @@
#include "SDL_waylandvideo.h"
#include "SDL_waylandtouch.h"
#include "SDL_hints.h"
#include "../../SDL_hints_c.h"
#include "SDL_events.h"
#include "xdg-shell-client-protocol.h"
@@ -46,12 +47,6 @@
#define FULLSCREEN_MASK (SDL_WINDOW_FULLSCREEN | SDL_WINDOW_FULLSCREEN_DESKTOP)
SDL_FORCE_INLINE SDL_bool
EGLTransparencyEnabled()
{
return SDL_GetHintBoolean(SDL_HINT_VIDEO_EGL_ALLOW_TRANSPARENCY, SDL_FALSE);
}
SDL_FORCE_INLINE SDL_bool
FloatEqual(float a, float b)
{
@@ -296,7 +291,7 @@ ConfigureWindowGeometry(SDL_Window *window)
* if the output size has changed.
*/
if (window_size_changed) {
if (!EGLTransparencyEnabled()) {
if (!viddata->egl_transparency_enabled) {
region = wl_compositor_create_region(viddata->compositor);
wl_region_add(region, 0, 0,
data->window_width, data->window_height);
@@ -2310,6 +2305,48 @@ void Wayland_DestroyWindow(_THIS, SDL_Window *window)
window->driverdata = NULL;
}
static void
EGLTransparencyChangedCallback(void *userdata, const char *name, const char *oldValue, const char *newValue)
{
const SDL_bool oldval = SDL_GetStringBoolean(oldValue, SDL_FALSE);
const SDL_bool newval = SDL_GetStringBoolean(newValue, SDL_FALSE);
if (oldval != newval) {
SDL_Window *window;
SDL_VideoData *viddata = (SDL_VideoData *) userdata;
SDL_VideoDevice *dev = SDL_GetVideoDevice();
viddata->egl_transparency_enabled = newval;
/* Iterate over all windows and update the surface opaque regions */
for (window = dev->windows; window != NULL; window = window->next) {
SDL_WindowData *wind = (SDL_WindowData *) window->driverdata;
if (!newval) {
struct wl_region *region = wl_compositor_create_region(wind->waylandData->compositor);
wl_region_add(region, 0, 0, wind->window_width, wind->window_height);
wl_surface_set_opaque_region(wind->surface, region);
wl_region_destroy(region);
} else {
wl_surface_set_opaque_region(wind->surface, NULL);
}
}
}
}
void
Wayland_InitWin(SDL_VideoData *data)
{
data->egl_transparency_enabled = SDL_GetHintBoolean(SDL_HINT_VIDEO_EGL_ALLOW_TRANSPARENCY, SDL_FALSE);
SDL_AddHintCallback(SDL_HINT_VIDEO_EGL_ALLOW_TRANSPARENCY, EGLTransparencyChangedCallback, data);
}
void
Wayland_QuitWin(SDL_VideoData *data)
{
SDL_DelHintCallback(SDL_HINT_VIDEO_EGL_ALLOW_TRANSPARENCY, EGLTransparencyChangedCallback, data);
}
#endif /* SDL_VIDEO_DRIVER_WAYLAND */
/* vi: set ts=4 sw=4 expandtab: */