linux-kernel - Re: [PATCH 6/7] drm/vkms: Change the gray RGB representation

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Date: Tue, 12 Mar 2024 17:16:01 -0300
From: Melissa Wen <mwen@...lia.com>
To: Arthur Grillo <arthurgrillo@...eup.net>
Cc: 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>, 
	Jonathan Corbet <corbet@....net>, pekka.paalanen@...oniitty.fi, 
	Louis Chauvet <louis.chauvet@...tlin.com>, 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: Re: [PATCH 6/7] drm/vkms: Change the gray RGB representation

On 03/06, Arthur Grillo wrote:
> Using the drm_fixed calls, this needs to be changed. Which in fact is
> more correct, colour.YCbCr_to_RGB() gives 0x8080 for same the yuv
> parameters.

Hi Arthur,

For consistency, shouldn't this change be together with the previous
patch that uses the drm_fixed api? I mean, a single patch that changes
to drm_fixed calls and adjust the color values accordingly, avoiding
room for mismatches?

Melissa
> 
> Signed-off-by: Arthur Grillo <arthurgrillo@...eup.net>
> ---
>  drivers/gpu/drm/vkms/tests/vkms_format_test.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/tests/vkms_format_test.c b/drivers/gpu/drm/vkms/tests/vkms_format_test.c
> index 66cdd83c3d25..49125cf76eb5 100644
> --- a/drivers/gpu/drm/vkms/tests/vkms_format_test.c
> +++ b/drivers/gpu/drm/vkms/tests/vkms_format_test.c
> @@ -48,7 +48,7 @@ static struct yuv_u8_to_argb_u16_case yuv_u8_to_argb_u16_cases[] = {
>  		.n_colors = 6,
>  		.colors = {
>  			{"white", {0xff, 0x80, 0x80}, {0xffff, 0xffff, 0xffff, 0xffff}},
> -			{"gray",  {0x80, 0x80, 0x80}, {0xffff, 0x8000, 0x8000, 0x8000}},
> +			{"gray",  {0x80, 0x80, 0x80}, {0xffff, 0x8080, 0x8080, 0x8080}},
>  			{"black", {0x00, 0x80, 0x80}, {0xffff, 0x0000, 0x0000, 0x0000}},
>  			{"red",   {0x4c, 0x55, 0xff}, {0xffff, 0xffff, 0x0000, 0x0000}},
>  			{"green", {0x96, 0x2c, 0x15}, {0xffff, 0x0000, 0xffff, 0x0000}},
> @@ -71,7 +71,7 @@ static struct yuv_u8_to_argb_u16_case yuv_u8_to_argb_u16_cases[] = {
>  		.n_colors = 6,
>  		.colors = {
>  			{"white", {0xeb, 0x80, 0x80}, {0xffff, 0xffff, 0xffff, 0xffff}},
> -			{"gray",  {0x7e, 0x80, 0x80}, {0xffff, 0x8000, 0x8000, 0x8000}},
> +			{"gray",  {0x7e, 0x80, 0x80}, {0xffff, 0x8080, 0x8080, 0x8080}},
>  			{"black", {0x10, 0x80, 0x80}, {0xffff, 0x0000, 0x0000, 0x0000}},
>  			{"red",   {0x51, 0x5a, 0xf0}, {0xffff, 0xffff, 0x0000, 0x0000}},
>  			{"green", {0x91, 0x36, 0x22}, {0xffff, 0x0000, 0xffff, 0x0000}},
> @@ -94,7 +94,7 @@ static struct yuv_u8_to_argb_u16_case yuv_u8_to_argb_u16_cases[] = {
>  		.n_colors = 4,
>  		.colors = {
>  			{"white", {0xff, 0x80, 0x80}, {0xffff, 0xffff, 0xffff, 0xffff}},
> -			{"gray",  {0x80, 0x80, 0x80}, {0xffff, 0x8000, 0x8000, 0x8000}},
> +			{"gray",  {0x80, 0x80, 0x80}, {0xffff, 0x8080, 0x8080, 0x8080}},
>  			{"black", {0x00, 0x80, 0x80}, {0xffff, 0x0000, 0x0000, 0x0000}},
>  			{"red",   {0x36, 0x63, 0xff}, {0xffff, 0xffff, 0x0000, 0x0000}},
>  			{"green", {0xb6, 0x1e, 0x0c}, {0xffff, 0x0000, 0xffff, 0x0000}},
> @@ -117,7 +117,7 @@ static struct yuv_u8_to_argb_u16_case yuv_u8_to_argb_u16_cases[] = {
>  		.n_colors = 4,
>  		.colors = {
>  			{"white", {0xeb, 0x80, 0x80}, {0xffff, 0xffff, 0xffff, 0xffff}},
> -			{"gray",  {0x7e, 0x80, 0x80}, {0xffff, 0x8000, 0x8000, 0x8000}},
> +			{"gray",  {0x7e, 0x80, 0x80}, {0xffff, 0x8080, 0x8080, 0x8080}},
>  			{"black", {0x10, 0x80, 0x80}, {0xffff, 0x0000, 0x0000, 0x0000}},
>  			{"red",   {0x3f, 0x66, 0xf0}, {0xffff, 0xffff, 0x0000, 0x0000}},
>  			{"green", {0xad, 0x2a, 0x1a}, {0xffff, 0x0000, 0xffff, 0x0000}},
> @@ -140,7 +140,7 @@ static struct yuv_u8_to_argb_u16_case yuv_u8_to_argb_u16_cases[] = {
>  		.n_colors = 4,
>  		.colors = {
>  			{"white", {0xff, 0x80, 0x80}, {0xffff, 0xffff, 0xffff, 0xffff}},
> -			{"gray",  {0x80, 0x80, 0x80}, {0xffff, 0x8000, 0x8000, 0x8000}},
> +			{"gray",  {0x80, 0x80, 0x80}, {0xffff, 0x8080, 0x8080, 0x8080}},
>  			{"black", {0x00, 0x80, 0x80}, {0xffff, 0x0000, 0x0000, 0x0000}},
>  			{"red",   {0x43, 0x5c, 0xff}, {0xffff, 0xffff, 0x0000, 0x0000}},
>  			{"green", {0xad, 0x24, 0x0b}, {0xffff, 0x0000, 0xffff, 0x0000}},
> @@ -163,7 +163,7 @@ static struct yuv_u8_to_argb_u16_case yuv_u8_to_argb_u16_cases[] = {
>  		.n_colors = 4,
>  		.colors = {
>  			{"white", {0xeb, 0x80, 0x80}, {0xffff, 0xffff, 0xffff, 0xffff}},
> -			{"gray",  {0x7e, 0x80, 0x80}, {0xffff, 0x8000, 0x8000, 0x8000}},
> +			{"gray",  {0x7e, 0x80, 0x80}, {0xffff, 0x8080, 0x8080, 0x8080}},
>  			{"black", {0x10, 0x80, 0x80}, {0xffff, 0x0000, 0x0000, 0x0000}},
>  			{"red",   {0x4a, 0x61, 0xf0}, {0xffff, 0xffff, 0x0000, 0x0000}},
>  			{"green", {0xa4, 0x2f, 0x19}, {0xffff, 0x0000, 0xffff, 0x0000}},
> 
> -- 
> 2.43.0
>