[PATCH v3 15/21] drm: Add helper to extract a LUT entry from either 16-bit or 32-bit LUT
From: Ariel D'Alessandro <hidden>
Date: 2025-12-23 18:03:50
Also in:
dri-devel, linux-mediatek, lkml
Subsystem:
drm drivers, the rest · Maintainers:
David Airlie, Simona Vetter, Linus Torvalds
Add a common helper to ease extracting a 32-bit LUT entry from either 16-bit or 32-bit LUT entry. This is handy for code that needs to handle both bit widths. Signed-off-by: Ariel D'Alessandro <redacted> Co-developed-by: Nícolas F. R. A. Prado <redacted> Signed-off-by: Nícolas F. R. A. Prado <redacted> --- include/drm/drm_color_mgmt.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 51279267ed3fd..3d0117aae342d 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h@@ -66,6 +66,33 @@ static inline u32 drm_color_lut32_extract(u32 user_input, int bit_precision) (1ULL << 32) - 1); } +/** + * drm_color_lut_to_lut32 - Copy LUT entry contents to 32-bit channel color LUT + * + * @dest: The destination 32-bit per channel color LUT entry + * @src: The source array of LUT entries (16-bit or 32-bit depending on @bits32) + * @index: LUT entry array index + * @bits32: Boolean indicating the source LUT entry bit-witdh + * + * Copy the contents of a LUT entry from the source array, to a 32-bit channel + * color LUT. The source array of LUT entries can be 16-bit or 32-bit width + * depending on the @bits32 boolean argument. + */ +static inline void drm_color_lut_to_lut32(struct drm_color_lut32 *dest, + void *src, int index, bool bits32) +{ + if (bits32) { + *dest = ((struct drm_color_lut32 *)src)[index]; + } else { + struct drm_color_lut *lut = + &((struct drm_color_lut *)src)[index]; + dest->red = lut->red; + dest->green = lut->green; + dest->blue = lut->blue; + dest->reserved = lut->reserved; + } +} + /** * drm_color_ctm_to_ctm_3x4 - Copy CTM matrix contents to 3x4 dimensions matrix *
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2.51.0