Add atomic gamma lut size fetching

Legacy gamma lut size now uses the new legacy_crtc member of
wlr_drm_crtc. This was Previously doen using old_crtc in
wlr_drm_connector, but since this refers to the crtc that was connected to
the ouput, this could give the wrong result.

1 files changed, 4 insertions, 2 deletions

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index abcfcf8a..eef1e333 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -140,6 +140,7 @@ bool wlr_drm_resources_init(struct wlr_drm_backend *drm) {
 	for (size_t i = 0; i < drm->num_crtcs; ++i) {
 		struct wlr_drm_crtc *crtc = &drm->crtcs[i];
 		crtc->id = res->crtcs[i];
+		crtc->legacy_crtc = drmModeGetCrtc(drm->fd, crtc->id);
 		wlr_drm_get_crtc_props(drm->fd, crtc->id, &crtc->props);
 	}
 
@@ -166,6 +167,7 @@ void wlr_drm_resources_free(struct wlr_drm_backend *drm) {
 	for (size_t i = 0; i < drm->num_crtcs; ++i) {
 		struct wlr_drm_crtc *crtc = &drm->crtcs[i];
 		drmModeAtomicFree(crtc->atomic);
+		drmModeFreeCrtc(crtc->legacy_crtc);
 		if (crtc->mode_id) {
 			drmModeDestroyPropertyBlob(drm->fd, crtc->mode_id);
 		}
@@ -235,8 +237,8 @@ static void wlr_drm_connector_set_gamma(struct wlr_output *output,
 
 static uint32_t wlr_drm_connector_get_gamma_size(struct wlr_output *output) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
-	drmModeCrtc *crtc = conn->old_crtc;
-	return crtc ? crtc->gamma_size : 0;
+	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
+	return drm->iface->crtc_get_gamma_size(drm, conn->crtc);
 }
 
 void wlr_drm_connector_start_renderer(struct wlr_drm_connector *conn) {