Commit a355b3d6 authored by Harry Wentland's avatar Harry Wentland Committed by Simon Ser
Browse files

drm/colorop: add BT2020/BT709 OETF and Inverse OETF 



The BT.709 and BT.2020 OETFs are the same, the only difference
being that the BT.2020 variant is defined with more precision
for 10 and 12-bit per color encodings.

Both are used as encoding functions for video content, and are
therefore defined as OETF (opto-electronic transfer function)
instead of as EOTF (electro-optical transfer function).

Signed-off-by: default avatarAlex Hung <alex.hung@amd.com>
Signed-off-by: default avatarHarry Wentland <harry.wentland@amd.com>
Reviewed-by: default avatarDaniel Stone <daniels@collabora.com>
Reviewed-by: default avatarSimon Ser <contact@emersion.fr>
Reviewed-by: default avatarSebastian Wick <sebastian.wick@redhat.com>
Signed-off-by: default avatarSimon Ser <contact@emersion.fr>
Link: https://patch.msgid.link/20251115000237.3561250-34-alex.hung@amd.com
parent ef3d703f

drivers/gpu/drm/drm_colorop.c

+2 −0
Original line number Diff line number Diff line
@@ -72,6 +72,8 @@ static const char * const colorop_curve_1d_type_names[] = { 
	[DRM_COLOROP_1D_CURVE_SRGB_INV_EOTF] = "sRGB Inverse EOTF",

	[DRM_COLOROP_1D_CURVE_PQ_125_EOTF] = "PQ 125 EOTF",

	[DRM_COLOROP_1D_CURVE_PQ_125_INV_EOTF] = "PQ 125 Inverse EOTF",

	[DRM_COLOROP_1D_CURVE_BT2020_INV_OETF] = "BT.2020 Inverse OETF",

	[DRM_COLOROP_1D_CURVE_BT2020_OETF] = "BT.2020 OETF",

};



/* Init Helpers */

include/drm/drm_colorop.h

+23 −0
Original line number Diff line number Diff line
@@ -82,6 +82,29 @@ enum drm_colorop_curve_1d_type { 
	 */

	DRM_COLOROP_1D_CURVE_PQ_125_INV_EOTF,



	/**

	 * @DRM_COLOROP_1D_CURVE_BT2020_INV_OETF:

	 *

	 * enum string "BT.2020 Inverse OETF"

	 *

	 * The inverse of &DRM_COLOROP_1D_CURVE_BT2020_OETF

	 */

	DRM_COLOROP_1D_CURVE_BT2020_INV_OETF,



	/**

	 * @DRM_COLOROP_1D_CURVE_BT2020_OETF:

	 *

	 * enum string "BT.2020 OETF"

	 *

	 * The BT.2020/BT.709 transfer function. The BT.709 and BT.2020

	 * transfer functions are the same, the only difference is that

	 * BT.2020 is defined with more precision for 10 and 12-bit

	 * encodings.

	 *

	 *

	 */

	DRM_COLOROP_1D_CURVE_BT2020_OETF,



	/**

	 * @DRM_COLOROP_1D_CURVE_COUNT:

	 *