linux-kernel - Re: [PATCH v2 1/3] drm/draw: add drm_draw_can_convert_from

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Message-ID: <13f1e073-8333-4dc8-adf6-54261e1a0fe0@redhat.com>
Date: Wed, 15 Oct 2025 09:39:31 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Francesco Valla <francesco@...la.it>,
 Javier Martinez Canillas <javierm@...hat.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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] drm/draw: add drm_draw_can_convert_from_xrgb8888

On 14/10/2025 22:08, Francesco Valla wrote:
> Add drm_draw_can_convert_from_xrgb8888() function that can be used to
> determine if a XRGB8888 color can be converted to the specified format.

Thanks for the v2, it looks good to me.

Reviewed-by: Jocelyn Falempe <jfalempe@...hat.com>

> 
> Signed-off-by: Francesco Valla <francesco@...la.it>
> ---
>   drivers/gpu/drm/drm_draw.c          | 29 +++++++++++++++++++++++++++++
>   drivers/gpu/drm/drm_draw_internal.h |  2 ++
>   2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_draw.c b/drivers/gpu/drm/drm_draw.c
> index 9dc0408fbbeadbe8282a2d6b210e0bfb0672967f..ccdd6b16e73fc01d58f45759cf3824be7aac155b 100644
> --- a/drivers/gpu/drm/drm_draw.c
> +++ b/drivers/gpu/drm/drm_draw.c
> @@ -15,6 +15,35 @@
>   #include "drm_draw_internal.h"
>   #include "drm_format_internal.h"
>   
> +/**
> + * drm_draw_can_convert_from_xrgb8888 - check if xrgb8888 can be converted to the desired format
> + * @format: format
> + *
> + * Returns:
> + * True if XRGB8888 can be converted to the specified format, false otherwise.
> + */
> +bool drm_draw_can_convert_from_xrgb8888(u32 format)
> +{
> +	switch (format) {
> +	case DRM_FORMAT_RGB565:
> +	case DRM_FORMAT_RGBA5551:
> +	case DRM_FORMAT_XRGB1555:
> +	case DRM_FORMAT_ARGB1555:
> +	case DRM_FORMAT_RGB888:
> +	case DRM_FORMAT_XRGB8888:
> +	case DRM_FORMAT_ARGB8888:
> +	case DRM_FORMAT_XBGR8888:
> +	case DRM_FORMAT_ABGR8888:
> +	case DRM_FORMAT_XRGB2101010:
> +	case DRM_FORMAT_ARGB2101010:
> +	case DRM_FORMAT_ABGR2101010:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +EXPORT_SYMBOL(drm_draw_can_convert_from_xrgb8888);
> +
>   /**
>    * drm_draw_color_from_xrgb8888 - convert one pixel from xrgb8888 to the desired format
>    * @color: input color, in xrgb8888 format
> diff --git a/drivers/gpu/drm/drm_draw_internal.h b/drivers/gpu/drm/drm_draw_internal.h
> index f121ee7339dc11537f677c833f0ee94fe0e799cd..2ab4cb341df94fc4173dd6f5e7a512bdcfa5e55c 100644
> --- a/drivers/gpu/drm/drm_draw_internal.h
> +++ b/drivers/gpu/drm/drm_draw_internal.h
> @@ -24,6 +24,8 @@ static inline const u8 *drm_draw_get_char_bitmap(const struct font_desc *font,
>   	return font->data + (c * font->height) * font_pitch;
>   }
>   
> +bool drm_draw_can_convert_from_xrgb8888(u32 format);
> +
>   u32 drm_draw_color_from_xrgb8888(u32 color, u32 format);
>   
>   void drm_draw_blit16(struct iosys_map *dmap, unsigned int dpitch,
>