Re: [PATCH v11 03/15] drm/vkms: Add typedef and documentation for pixel_read and pixel_write functions

[Randy Dunlap <rdunlap@infradead.org>]

Hi,

On 9/30/24 8:31 AM, Louis Chauvet wrote:
> Introduce two typedefs: pixel_read_t and pixel_write_t. It allows the
> compiler to check if the passed functions take the correct arguments.
> Such typedefs will help ensuring consistency across the code base in
> case of update of these prototypes.
> 
> Rename input/output variable in a consistent way between read_line and
> write_line.
> 
> A warn has been added in get_pixel_*_function to alert when an unsupported
> pixel format is requested. As those formats are checked before
> atomic_update callbacks, it should never happen.
> 
> Document for those typedefs.
> 
> Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
> Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
> ---
>  drivers/gpu/drm/vkms/vkms_drv.h     |  23 ++++++-
>  drivers/gpu/drm/vkms/vkms_formats.c | 124 ++++++++++++++++++++----------------
>  drivers/gpu/drm/vkms/vkms_formats.h |   4 +-
>  drivers/gpu/drm/vkms/vkms_plane.c   |   2 +-
>  4 files changed, 94 insertions(+), 59 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index fcb5a5ff7df7..137348f4adb2 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -53,12 +53,31 @@ struct line_buffer {
>  	struct pixel_argb_u16 *pixels;
>  };
>  
> +/**
> + * typedef pixel_write_t - These functions are used to read a pixel from a
> + * &struct pixel_argb_u16, convert it in a specific format and write it in the @dst_pixels

Should @dst_pixels be @out_pixel?

> + * buffer.
> + *
> + * @out_pixel: destination address to write the pixel
> + * @in_pixel: pixel to write
> + */
> +typedef void (*pixel_write_t)(u8 *out_pixel, struct pixel_argb_u16 *in_pixel);