diff options
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_formats.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c index 5945da0beba6..542100041049 100644 --- a/drivers/gpu/drm/vkms/vkms_formats.c +++ b/drivers/gpu/drm/vkms/vkms_formats.c @@ -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; |