From dc258b2237df9aaf898efa849bcb8e2d1cddec68 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Tue, 28 Jan 2025 12:40:40 +0100
Subject: [PATCH] output: add transfer function to image description

---
 include/wlr/types/wlr_output.h | 4 ++++
 types/output/output.c          | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/include/wlr/types/wlr_output.h b/include/wlr/types/wlr_output.h
index c94b82116..e6cd58824 100644
--- a/include/wlr/types/wlr_output.h
+++ b/include/wlr/types/wlr_output.h
@@ -89,9 +89,12 @@ enum wlr_output_state_mode_type {
  * Carries information about the color encoding used for a struct wlr_buffer.
  *
  * Supported primaries are advertised in wlr_output.supported_primaries.
+ * Supported transfer functions are advertised in
+ * wlr_output.supported_transfer_functions.
  */
 struct wlr_output_image_description {
 	enum wlr_color_named_primaries primaries;
+	enum wlr_color_transfer_function transfer_function;
 };
 
 /**
@@ -182,6 +185,7 @@ struct wlr_output {
 	int32_t refresh; // mHz, may be zero
 
 	uint32_t supported_primaries; // bitfield of enum wlr_color_named_primaries
+	uint32_t supported_transfer_functions; // bitfield of enum wlr_color_transfer_function
 
 	bool enabled;
 	float scale;
diff --git a/types/output/output.c b/types/output/output.c
index a0a3f9e02..8576bb0e6 100644
--- a/types/output/output.c
+++ b/types/output/output.c
@@ -679,6 +679,10 @@ static bool output_basic_test(struct wlr_output *output,
 			wlr_log(WLR_DEBUG, "Unsupported image description primaries");
 			return false;
 		}
+		if (!(output->supported_transfer_functions & state->image_description->transfer_function)) {
+			wlr_log(WLR_DEBUG, "Unsupported image description transfer function");
+			return false;
+		}
 	}
 
 	return true;