3 files changed, 44 insertions, 3 deletions
diff --git a/include/wlr/interfaces/wlr_output.h b/include/wlr/interfaces/wlr_output.h
index 2224932f..4860a5b6 100644
--- a/include/wlr/interfaces/wlr_output.h
+++ b/include/wlr/interfaces/wlr_output.h
@@ -28,7 +28,7 @@ struct wlr_output_impl {
 	void (*destroy)(struct wlr_output *output);
 	bool (*make_current)(struct wlr_output *output, int *buffer_age);
 	bool (*swap_buffers)(struct wlr_output *output, pixman_region32_t *damage);
-	void (*set_gamma)(struct wlr_output *output,
+	bool (*set_gamma)(struct wlr_output *output,
 		uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
 	uint32_t (*get_gamma_size)(struct wlr_output *output);
 	bool (*export_dmabuf)(struct wlr_output *output,
diff --git a/include/wlr/types/wlr_gamma_control_v1.h b/include/wlr/types/wlr_gamma_control_v1.h
new file mode 100644
index 00000000..5a173323
--- /dev/null
+++ b/include/wlr/types/wlr_gamma_control_v1.h
@@ -0,0 +1,31 @@
+#ifndef WLR_TYPES_WLR_GAMMA_CONTROL_V1_H
+#define WLR_TYPES_WLR_GAMMA_CONTROL_V1_H
+
+#include <wayland-server.h>
+
+struct wlr_gamma_control_manager_v1 {
+	struct wl_global *global;
+	struct wl_list resources;
+	struct wl_list controls; // wlr_gamma_control_v1::link
+
+	struct wl_listener display_destroy;
+
+	void *data;
+};
+
+struct wlr_gamma_control_v1 {
+	struct wl_resource *resource;
+	struct wlr_output *output;
+	struct wl_list link;
+
+	struct wl_listener output_destroy_listener;
+
+	void *data;
+};
+
+struct wlr_gamma_control_manager_v1 *wlr_gamma_control_manager_v1_create(
+	struct wl_display *display);
+void wlr_gamma_control_manager_v1_destroy(
+	struct wlr_gamma_control_manager_v1 *manager);
+
+#endif
diff --git a/include/wlr/types/wlr_output.h b/include/wlr/types/wlr_output.h
index f8452d12..3a9f3c41 100644
--- a/include/wlr/types/wlr_output.h
+++ b/include/wlr/types/wlr_output.h
@@ -174,9 +174,19 @@ bool wlr_output_swap_buffers(struct wlr_output *output, struct timespec *when,
  * it is a no-op.
  */
 void wlr_output_schedule_frame(struct wlr_output *output);
-void wlr_output_set_gamma(struct wlr_output *output,
-	uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
+/**
+ * Returns the maximum length of each gamma ramp, or 0 if unsupported.
+ */
 uint32_t wlr_output_get_gamma_size(struct wlr_output *output);
+/**
+ * Sets the gamma table for this output. `r`, `g` and `b` are gamma ramps for
+ * red, green and blue. `size` is the length of the ramps and must not exceed
+ * the value returned by `wlr_output_get_gamma_size`.
+ *
+ * Providing zero-sized ramps resets the gamma table.
+ */
+bool wlr_output_set_gamma(struct wlr_output *output,
+	uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
 bool wlr_output_export_dmabuf(struct wlr_output *output,
 	struct wlr_dmabuf_attributes *attribs);
 void wlr_output_set_fullscreen_surface(struct wlr_output *output,