renderer: better sdr eotf settings (#12812)

src/helpers/TransferFunction.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+namespace NTransferFunction {
+    enum eTF : uint8_t {
+        TF_DEFAULT        = 0,
+        TF_AUTO           = 1,
+        TF_SRGB           = 2,
+        TF_GAMMA22        = 3,
+        TF_FORCED_GAMMA22 = 4,
+    };
+
+    eTF         fromString(const std::string tfName);
+    std::string toString(eTF tf);
+
+    eTF         fromConfig();
+}