DRMBackend: Fix HDR static metadata creation for PQ EOTF via lua config

The HDR10 infoframe creation was nested inside the EDID parsing block,
so it only ran when HDR info came from the EDID. If a PQ EOTF was set
via lua config, bHasKnownHDRInfo would be true, the EDID block would
be skipped, and pDefaultMetadataBlob would never be created.

Move the infoframe creation outside the EDID parsing block and gate it
on HDR10 so the metadata is created whenever PQ output is configured,
regardless of whether the HDR info came from lua config or EDID.

We still use the EDID metadata when undefined in the lua config, or when
there is no config for a PQ-compatible display.

Author: matte-schwartz

src/Backends/DRMBackend.cpp

@@ -2483,38 +2483,41 @@ namespace gamescope
 					pHDRStaticMetadata->desired_content_min_luminance
 					? nits_to_u16_dark( pHDRStaticMetadata->desired_content_min_luminance )
 					: nits_to_u16_dark( 0.0f );
-
-				// Generate a default HDR10 infoframe.
-				hdr_output_metadata defaultHDRMetadata{};
-				hdr_metadata_infoframe *pInfoframe = &defaultHDRMetadata.hdmi_metadata_type1;
-
-				// To be filled in by the app based on the scene, default to desired_content_max_luminance
-				//
-		 		// Using display's max_fall for the default metadata max_cll to avoid displays
-		 		// overcompensating with tonemapping for SDR content.
-				uint16_t uDefaultInfoframeLuminances = m_Mutable.HDR.uMaxFrameAverageLuminance;
-
-				pInfoframe->display_primaries[0].x = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.r.x );
-				pInfoframe->display_primaries[0].y = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.r.y );
-				pInfoframe->display_primaries[1].x = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.g.x );
-				pInfoframe->display_primaries[1].y = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.g.y );
-				pInfoframe->display_primaries[2].x = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.b.x );
-				pInfoframe->display_primaries[2].y = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.b.y );
-				pInfoframe->white_point.x = color_xy_to_u16( m_Mutable.DisplayColorimetry.white.x );
-				pInfoframe->white_point.y = color_xy_to_u16( m_Mutable.DisplayColorimetry.white.y );
-				pInfoframe->max_display_mastering_luminance = uDefaultInfoframeLuminances;
-				pInfoframe->min_display_mastering_luminance = m_Mutable.HDR.uMinContentLightLevel;
-				pInfoframe->max_cll = uDefaultInfoframeLuminances;
-				pInfoframe->max_fall = uDefaultInfoframeLuminances;
-				pInfoframe->eotf = HDMI_EOTF_ST2084;
-
-				m_Mutable.HDR.pDefaultMetadataBlob = GetBackend()->CreateBackendBlob( defaultHDRMetadata );
 			}
 			else
 			{
 				m_Mutable.HDR.bExposeHDRSupport = false;
 			}
 		}
+
+		// Generate a default HDR10 infoframe.
+		if ( m_Mutable.HDR.IsHDR10() )
+		{
+			hdr_output_metadata defaultHDRMetadata{};
+			hdr_metadata_infoframe *pInfoframe = &defaultHDRMetadata.hdmi_metadata_type1;
+
+			// To be filled in by the app based on the scene, default to desired_content_max_luminance
+			//
+			// Using display's max_fall for the default metadata max_cll to avoid displays
+			// overcompensating with tonemapping for SDR content.
+			uint16_t uDefaultInfoframeLuminances = m_Mutable.HDR.uMaxFrameAverageLuminance;
+
+			pInfoframe->display_primaries[0].x = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.r.x );
+			pInfoframe->display_primaries[0].y = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.r.y );
+			pInfoframe->display_primaries[1].x = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.g.x );
+			pInfoframe->display_primaries[1].y = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.g.y );
+			pInfoframe->display_primaries[2].x = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.b.x );
+			pInfoframe->display_primaries[2].y = color_xy_to_u16( m_Mutable.DisplayColorimetry.primaries.b.y );
+			pInfoframe->white_point.x = color_xy_to_u16( m_Mutable.DisplayColorimetry.white.x );
+			pInfoframe->white_point.y = color_xy_to_u16( m_Mutable.DisplayColorimetry.white.y );
+			pInfoframe->max_display_mastering_luminance = uDefaultInfoframeLuminances;
+			pInfoframe->min_display_mastering_luminance = m_Mutable.HDR.uMinContentLightLevel;
+			pInfoframe->max_cll = uDefaultInfoframeLuminances;
+			pInfoframe->max_fall = uDefaultInfoframeLuminances;
+			pInfoframe->eotf = HDMI_EOTF_ST2084;
+
+			m_Mutable.HDR.pDefaultMetadataBlob = GetBackend()->CreateBackendBlob( defaultHDRMetadata );
+		}
 	}
 
 	/////////////////////////