Hello,
What actually is this OETF? Is it power 1/2.4? Or reversed BT.1886?
Best regards,
Shengyu
________________________________
发件人: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> 代表 Alex Hung
<alex.h...@amd.com>
发送时间: Friday, August 15, 2025 11:50:20 AM
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主题: [PATCH V11 31/47] drm/colorop: add BT2020/BT709 OETF and Inverse OETF
From: Harry Wentland <harry.wentl...@amd.com>
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: Alex Hung <alex.h...@amd.com>
Signed-off-by: Harry Wentland <harry.wentl...@amd.com>
Reviewed-by: Daniel Stone <dani...@collabora.com>
Reviewed-by: Simon Ser <cont...@emersion.fr>
---
v9:
- Move DRM_COLOROP_1D_CURVE_BT2020_* from middle to end (Simon Ser)
drivers/gpu/drm/drm_colorop.c | 2 ++
include/drm/drm_colorop.h | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index 5bb45963fa1f..c245a3ff45d3 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -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",
};
diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
index a38c90f61dc6..c6d2b289e3cf 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -83,6 +83,29 @@ 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:
*
--
2.43.0
