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window: Add API to check for subcompositor, use in subsurface example

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This way we can fail with a nice error message.
This commit is contained in:
Kristian Høgsberg 2013-08-15 11:54:03 -07:00
parent c85a9178c7
commit b20b00923a
3 changed files with 20 additions and 0 deletions
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6
clients/subsurfaces.c
View file

@ -781,6 +781,12 @@ main(int argc, char *argv[])
return -1;
}
if (!display_has_subcompositor(display)) {
fprintf(stderr, "compositor does not support "
"the subcompositor extension\n");
return -1;
}
app = demoapp_create(display);
display_run(display);

11
clients/window.c
View file

@ -5367,6 +5367,17 @@ display_get_display(struct display *display)
return display->display;
}
int
display_has_subcompositor(struct display *display)
{
if (display->subcompositor)
return 1;
wl_display_roundtrip(display->display);
return display->subcompositor != NULL;
}
cairo_device_t *
display_get_cairo_device(struct display *display)
{

3
clients/window.h
View file

@ -78,6 +78,9 @@ display_get_user_data(struct display *display);
struct wl_display *
display_get_display(struct display *display);
int
display_has_subcompositor(struct display *display);
cairo_device_t *
display_get_cairo_device(struct display *display);