linux-kernel - [PATCH v3 13/21] drm: Add helper to extract a 3x4 matrix from any CTM matrix dimensions

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Message-Id: <20251223-mtk-post-blend-color-pipeline-v3-13-7d969f9a37a0@collabora.com>
Date: Tue, 23 Dec 2025 15:01:33 -0300
From: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Louis Chauvet <louis.chauvet@...tlin.com>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 kernel@...labora.com, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>, 
 Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Subject: [PATCH v3 13/21] drm: Add helper to extract a 3x4 matrix from any
 CTM matrix dimensions

Add a common helper to ease the conversion from both 3x3 or 3x4 matrices
to a CTM 3x4 matrix. This is handy for code that needs to handle both
dimensions.

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
---
 include/drm/drm_color_mgmt.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 5140691f476a9..51279267ed3fd 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -66,6 +66,40 @@ static inline u32 drm_color_lut32_extract(u32 user_input, int bit_precision)
 				     (1ULL << 32) - 1);
 }

+/**
+ * drm_color_ctm_to_ctm_3x4 - Copy CTM matrix contents to 3x4 dimensions matrix
+ *
+ * @dest: The destination CTM 3x4 dimensions matrix
+ * @src: The source CTM matrix (3x3 or 3x4 dimensions depending on @ctm_3x4)
+ * @ctm_3x4: Boolean indicating the source CTM matrix dimensions
+ *
+ * Copy the contents of a CTM matrix from @src, to a CTM 3x4 dimensions matrix.
+ * The source matrix can be 3x3 or 3x4 dimensions depending on the @ctm_3x4
+ * boolean argument.
+ */
+static inline void drm_color_ctm_to_ctm_3x4(struct drm_color_ctm_3x4 *dest,
+					    void *src, bool ctm_3x4)
+{
+	if (ctm_3x4) {
+		*dest = *(struct drm_color_ctm_3x4 *)src;
+	} else {
+		struct drm_color_ctm *ctm = (struct drm_color_ctm *)src;
+
+		dest->matrix[0] = ctm->matrix[0];
+		dest->matrix[1] = ctm->matrix[1];
+		dest->matrix[2] = ctm->matrix[2];
+		dest->matrix[3] = 0;
+		dest->matrix[4] = ctm->matrix[3];
+		dest->matrix[5] = ctm->matrix[4];
+		dest->matrix[6] = ctm->matrix[5];
+		dest->matrix[7] = 0;
+		dest->matrix[8] = ctm->matrix[6];
+		dest->matrix[9] = ctm->matrix[7];
+		dest->matrix[10] = ctm->matrix[8];
+		dest->matrix[11] = 0;
+	}
+}
+
 u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n);

 void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,

-- 
2.51.0