| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20240306-louis-vkms-conv-v1-2-5bfe7d129fdd@riseup.net>
Date: Wed, 06 Mar 2024 17:03:09 -0300
From: Arthur Grillo <arthurgrillo@...eup.net>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
Melissa Wen <melissa.srw@...il.com>,
Maíra Canal <mairacanal@...eup.net>,
Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, arthurgrillo@...eup.net,
Jonathan Corbet <corbet@....net>, pekka.paalanen@...oniitty.fi,
Louis Chauvet <louis.chauvet@...tlin.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com,
thomas.petazzoni@...tlin.com, seanpaul@...gle.com, marcheu@...gle.com,
nicolejadeyee@...gle.com
Subject: [PATCH 2/7] drm/vkms: Add comments
Signed-off-by: Arthur Grillo <arthurgrillo@...eup.net>
---
drivers/gpu/drm/vkms/vkms_formats.c | 47 +++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index 44d9b9b3bdc3..55ed3f598bd7 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -577,6 +577,18 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 0,
};
+
+ /*
+ * Those matrixies were generated using the colour python framework
+ *
+ * Below are the function calls used to generate eac matrix, go to
+ * https://colour.readthedocs.io/en/develop/generated/colour.matrix_YCbCr.html
+ * for more info:
+ *
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.601"],
+ * is_legal = False,
+ * bits = 8) * 2**32).astype(int)
+ */
static struct conversion_matrix yuv_bt601_full = {
.matrix = {
{ 4294967296, 0, 6021544149 },
@@ -585,6 +597,12 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 0,
};
+
+ /*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.601"],
+ * is_legal = True,
+ * bits = 8) * 2**32).astype(int)
+ */
static struct conversion_matrix yuv_bt601_limited = {
.matrix = {
{ 5020601039, 0, 6881764740 },
@@ -593,6 +611,12 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 16,
};
+
+ /*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.709"],
+ * is_legal = False,
+ * bits = 8) * 2**32).astype(int)
+ */
static struct conversion_matrix yuv_bt709_full = {
.matrix = {
{ 4294967296, 0, 6763714498 },
@@ -601,6 +625,12 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 0,
};
+
+ /*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.709"],
+ * is_legal = True,
+ * bits = 8) * 2**32).astype(int)
+ */
static struct conversion_matrix yuv_bt709_limited = {
.matrix = {
{ 5020601039, 0, 7729959424 },
@@ -609,6 +639,12 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 16,
};
+
+ /*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.2020"],
+ * is_legal = False,
+ * bits = 8) * 2**32).astype(int)
+ */
static struct conversion_matrix yuv_bt2020_full = {
.matrix = {
{ 4294967296, 0, 6333358775 },
@@ -617,6 +653,12 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 0,
};
+
+ /*
+ * numpy.around(colour.matrix_YCbCr(K=colour.WEIGHTS_YCBCR["ITU-R BT.2020"],
+ * is_legal = True,
+ * bits = 8) * 2**32).astype(int)
+ */
static struct conversion_matrix yuv_bt2020_limited = {
.matrix = {
{ 5020601039, 0, 7238124312 },
@@ -625,6 +667,11 @@ get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encoding,
},
.y_offset = 16,
};
+
+ /*
+ * The next matrices are just the previous ones, but with the first and
+ * second columns swapped
+ */
static struct conversion_matrix yvu_bt601_full = {
.matrix = {
{ 4294967296, 6021544149, 0 },
--
2.43.0
Powered by blists - more mailing lists