From dca0703dac7364a3e3cbec8944a69d56ea3d798f Mon Sep 17 00:00:00 2001
From: David Turner <david.turner@raspberrypi.com>
Date: Thu, 13 Feb 2025 16:23:00 +0000
Subject: [PATCH] backend/drm: Add color_range/encoding properties

Add the following optional DRM properties, for use by the
color-representation-v1 protocol:
- COLOR_ENCODING
- COLOR_RANGE
---
 backend/drm/properties.c         |  2 ++
 include/backend/drm/properties.h | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/backend/drm/properties.c b/backend/drm/properties.c
index 314023954..4c6bdcb36 100644
--- a/backend/drm/properties.c
+++ b/backend/drm/properties.c
@@ -50,6 +50,8 @@ static const struct prop_info crtc_info[] = {
 
 static const struct prop_info plane_info[] = {
 #define INDEX(name) (offsetof(struct wlr_drm_plane_props, name) / sizeof(uint32_t))
+	{ "COLOR_ENCODING", INDEX(color_encoding) },
+	{ "COLOR_RANGE", INDEX(color_range) },
 	{ "CRTC_H", INDEX(crtc_h) },
 	{ "CRTC_ID", INDEX(crtc_id) },
 	{ "CRTC_W", INDEX(crtc_w) },
diff --git a/include/backend/drm/properties.h b/include/backend/drm/properties.h
index c02d655ba..20e0a5bff 100644
--- a/include/backend/drm/properties.h
+++ b/include/backend/drm/properties.h
@@ -65,6 +65,22 @@ struct wlr_drm_plane_props {
 	uint32_t hotspot_x;
 	uint32_t hotspot_y;
 	uint32_t in_fence_fd;
+
+	uint32_t color_encoding; // Not guaranteed to exist
+	uint32_t color_range; // Not guaranteed to exist
+};
+
+// Equivalent to wlr_drm_color_encoding defined in the kernel (but not exported)
+enum wlr_drm_color_encoding {
+	WLR_DRM_COLOR_YCBCR_BT601,
+	WLR_DRM_COLOR_YCBCR_BT709,
+	WLR_DRM_COLOR_YCBCR_BT2020,
+};
+
+// Equivalent to wlr_drm_color_range defined in the kernel (but not exported)
+enum wlr_drm_color_range {
+	WLR_DRM_COLOR_YCBCR_FULL_RANGE,
+	WLR_DRM_COLOR_YCBCR_LIMITED_RANGE,
 };
 
 bool get_drm_connector_props(int fd, uint32_t id,