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drm/vkms: Add kernel-doc to the function vkms_compose_row()

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The function vkms_compose_row() was introduced in the code without any
documentation. In order to make the function more clear, add a
kernel-doc to it.

Suggested-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230508220030.434118-1-mcanal@igalia.com
This commit is contained in:
Maíra Canal
2023-05-08 19:00:29 -03:00
committed by Maíra Canal
parent 042aeecc02
commit d755cd3cff
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/vkms/vkms_formats.c
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@@ -111,6 +111,19 @@ static void RGB565_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
out_pixel->b = drm_fixp2int_round(drm_fixp_mul(fp_b, fp_rb_ratio));
}
/**
* vkms_compose_row - compose a single row of a plane
* @stage_buffer: output line with the composed pixels
* @plane: state of the plane that is being composed
* @y: y coordinate of the row
*
* This function composes a single row of a plane. It gets the source pixels
* through the y coordinate (see get_packed_src_addr()) and goes linearly
* through the source pixel, reading the pixels and converting it to
* ARGB16161616 (see the pixel_read() callback). For rotate-90 and rotate-270,
* the source pixels are not traversed linearly. The source pixels are queried
* on each iteration in order to traverse the pixels vertically.
*/
void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state *plane, int y)
{
struct pixel_argb_u16 *out_pixels = stage_buffer->pixels;