[PATCH 2/7] drm/vkms: Add comments

[Melissa Wen]

On 03/06, Arthur Grillo wrote:
Hi,

can you describe better the scope of your changes? Limiting the scope
in the commit message and also describing in the body a summary of what
you are documenting and reasons.

Thanks,

Melissa

> Signed-off-by: Arthur Grillo <arthurgrillo at riseup.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
>