linux-kernel - Re: [PATCH RESEND v2 2/8] drm/vkms: Add support for ARGB8888 formats

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Message-ID: <40c85513-6c57-4b9c-87f6-2ca56c556462@riseup.net>
Date: Sat, 26 Oct 2024 11:11:55 -0300
From: Maíra Canal <mairacanal@...eup.net>
To: Louis Chauvet <louis.chauvet@...tlin.com>,
 Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
 Melissa Wen <melissa.srw@...il.com>,
 Haneen Mohammed <hamohammed.sa@...il.com>,
 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>,
 Simona Vetter <simona.vetter@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net,
 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,
 20241007-yuv-v12-0-01c1ada6fec8@...tlin.com
Subject: Re: [PATCH RESEND v2 2/8] drm/vkms: Add support for ARGB8888 formats

Hi Louis,

On 07/10/24 13:46, Louis Chauvet wrote:
> The formats XRGB8888 and ARGB8888 were already supported.
> Add the support for:
> - XBGR8888
> - RGBX8888
> - BGRX8888
> - ABGR8888
> - RGBA8888
> - BGRA8888
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
>   drivers/gpu/drm/vkms/vkms_formats.c | 18 ++++++++++++++++++
>   drivers/gpu/drm/vkms/vkms_plane.c   |  6 ++++++
>   2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
> index 8f1bcca38148..b5a38f70c62b 100644
> --- a/drivers/gpu/drm/vkms/vkms_formats.c
> +++ b/drivers/gpu/drm/vkms/vkms_formats.c
> @@ -432,8 +432,14 @@ static void R4_read_line(const struct vkms_plane_state *plane, int x_start,
>   
>   
>   READ_LINE_ARGB8888(XRGB8888_read_line, px, 255, px[2], px[1], px[0])
> +READ_LINE_ARGB8888(XBGR8888_read_line, px, 255, px[0], px[1], px[2]) > +READ_LINE_ARGB8888(RGBX8888_read_line, px, 255, px[3], px[2], px[1])

I'm not expert in colors, but is this correct? From what I understand,
it should be:

READ_LINE_ARGB8888(RGBX8888_read_line, px, px[2], px[1], px[0], 255)
                                            ^R     ^G     ^B     ^X

> +READ_LINE_ARGB8888(BGRX8888_read_line, px, 255, px[1], px[2], px[3])

Again, is this correct?

Best Regards,
- Maíra

>   
>   READ_LINE_ARGB8888(ARGB8888_read_line, px, px[3], px[2], px[1], px[0])
> +READ_LINE_ARGB8888(ABGR8888_read_line, px, px[3], px[0], px[1], px[2])
> +READ_LINE_ARGB8888(RGBA8888_read_line, px, px[0], px[3], px[2], px[1])
> +READ_LINE_ARGB8888(BGRA8888_read_line, px, px[0], px[1], px[2], px[3])
>   
>   
>   READ_LINE_16161616(ARGB16161616_read_line, px, px[3], px[2], px[1], px[0]);
> @@ -637,8 +643,20 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
>   	switch (format) {
>   	case DRM_FORMAT_ARGB8888:
>   		return &ARGB8888_read_line;
> +	case DRM_FORMAT_ABGR8888:
> +		return &ABGR8888_read_line;
> +	case DRM_FORMAT_BGRA8888:
> +		return &BGRA8888_read_line;
> +	case DRM_FORMAT_RGBA8888:
> +		return &RGBA8888_read_line;
>   	case DRM_FORMAT_XRGB8888:
>   		return &XRGB8888_read_line;
> +	case DRM_FORMAT_XBGR8888:
> +		return &XBGR8888_read_line;
> +	case DRM_FORMAT_RGBX8888:
> +		return &RGBX8888_read_line;
> +	case DRM_FORMAT_BGRX8888:
> +		return &BGRX8888_read_line;
>   	case DRM_FORMAT_ARGB16161616:
>   		return &ARGB16161616_read_line;
>   	case DRM_FORMAT_XRGB16161616:
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 67f891e7ac58..941a6e92a040 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -14,7 +14,13 @@
>   
>   static const u32 vkms_formats[] = {
>   	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_ABGR8888,
> +	DRM_FORMAT_BGRA8888,
> +	DRM_FORMAT_RGBA8888,
>   	DRM_FORMAT_XRGB8888,
> +	DRM_FORMAT_XBGR8888,
> +	DRM_FORMAT_RGBX8888,
> +	DRM_FORMAT_BGRX8888,
>   	DRM_FORMAT_XRGB16161616,
>   	DRM_FORMAT_ARGB16161616,
>   	DRM_FORMAT_RGB565,
>