Add set_gamma and get_gamma_size to wlr_output_impl

backend/drm/drm.c

@@ -301,6 +301,23 @@ static void wlr_drm_output_swap_buffers(struct wlr_output *_output) {
 	output->pageflip_pending = true;
 }
 
+static void wlr_drm_output_set_gamma(struct wlr_output *_output,
+		uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
+	struct wlr_drm_output *output = (struct wlr_drm_output *)_output;
+	struct wlr_drm_backend *backend =
+		wl_container_of(output->renderer, backend, renderer);
+	drmModeCrtcSetGamma(backend->fd, output->crtc->id, size, r, g, b);
+}
+
+static uint16_t wlr_drm_output_get_gamma_size(struct wlr_output *_output) {
+	struct wlr_drm_output *output = (struct wlr_drm_output *)_output;
+	drmModeCrtc *crtc = output->old_crtc;
+	if (!crtc) {
+		return 0;
+	}
+	return crtc->gamma_size;
+}
+
 void wlr_drm_output_start_renderer(struct wlr_drm_output *output) {
 	if (output->state != WLR_DRM_OUTPUT_CONNECTED) {
 		return;
@@ -696,6 +713,8 @@ static struct wlr_output_impl output_impl = {
 	.destroy = wlr_drm_output_destroy,
 	.make_current = wlr_drm_output_make_current,
 	.swap_buffers = wlr_drm_output_swap_buffers,
+	.set_gamma = wlr_drm_output_set_gamma,
+	.get_gamma_size = wlr_drm_output_get_gamma_size,
 };
 
 static int find_id(const void *item, const void *cmp_to) {

include/wlr/interfaces/wlr_output.h

@@ -14,6 +14,9 @@ struct wlr_output_impl {
 	void (*destroy)(struct wlr_output *output);
 	void (*make_current)(struct wlr_output *output);
 	void (*swap_buffers)(struct wlr_output *output);
+	void (*set_gamma)(struct wlr_output *output,
+			uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b);
+	uint16_t (*get_gamma_size)(struct wlr_output *output);
 };
 
 void wlr_output_init(struct wlr_output *output, const struct wlr_output_impl *impl);

types/wlr_output.c

@@ -226,10 +226,14 @@ void wlr_output_swap_buffers(struct wlr_output *output) {
 
 void wlr_output_set_gamma(struct wlr_output *output,
 	uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
-	// TODO
+	if (output->impl->set_gamma) {
+		output->impl->set_gamma(output, size, r, g, b);
+	}
 }
 
 uint16_t wlr_output_get_gamma_size(struct wlr_output *output) {
-	// TODO
-	return 0;
+	if (!output->impl->get_gamma_size) {
+		return 0;
+	}
+	return output->impl->get_gamma_size(output);
 }