render/allocator: fallback to renderer DRM FD in autocreate
If the backend doesn't have a DRM FD, fallback to the renderer's. This accomodates for the situation where the headless backend hasn't picked a DRM FD in particular, but the renderer has picked one.
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@ -139,6 +139,9 @@ struct wlr_allocator *wlr_allocator_autocreate(struct wlr_backend *backend,
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struct wlr_renderer *renderer) {
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// Note, drm_fd may be negative if unavailable
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int drm_fd = wlr_backend_get_drm_fd(backend);
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if (drm_fd < 0) {
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drm_fd = wlr_renderer_get_drm_fd(renderer);
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}
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return allocator_autocreate_with_drm_fd(backend, renderer, drm_fd);
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}
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