Re: [PATCH v2] drm: support hotspot for universal plane cursors

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Nov 17, 2015 at 03:05:34PM +0000, John Keeping wrote:
> The request's hot_x and hot_y are set correctly for both
> DRM_IOCTL_MODE_CURSOR and DRM_IOCTL_MODE_CURSOR2 so we just need to save
> the values and then apply the offset to the cursor plane when the cursor
> moves.
> 
> Signed-off-by: John Keeping <john@metanate.com>
> ---
> v2:
>   - add kerneldoc for hot_x and hot_y in struct drm_crtc
> 
>  drivers/gpu/drm/drm_crtc.c | 11 +++++++----
>  include/drm/drm_crtc.h     |  6 ++++++
>  2 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 720a153..40f5b84 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -2831,6 +2831,9 @@ static int drm_mode_cursor_universal(struct drm_crtc *crtc,
>  				DRM_DEBUG_KMS("failed to wrap cursor buffer in drm framebuffer\n");
>  				return PTR_ERR(fb);
>  			}
> +
> +			crtc->hot_x = req->hot_x;
> +			crtc->hot_y = req->hot_y;
>  		} else {
>  			fb = NULL;
>  		}
> @@ -2841,11 +2844,11 @@ static int drm_mode_cursor_universal(struct drm_crtc *crtc,
>  	}
>  
>  	if (req->flags & DRM_MODE_CURSOR_MOVE) {
> -		crtc_x = req->x;
> -		crtc_y = req->y;
> +		crtc_x = req->x - crtc->hot_x;
> +		crtc_y = req->y - crtc->hot_y;
>  	} else {
> -		crtc_x = crtc->cursor_x;
> -		crtc_y = crtc->cursor_y;
> +		crtc_x = crtc->cursor_x - crtc->hot_x;
> +		crtc_y = crtc->cursor_y - crtc->hot_y;

Why does the location of the hotspot affect the plane position?

Naturally there's no documentation in the uapi header for any of this
stuff :( Would be nice if the pople excited about documentation would
fix that part instead of just focusing on the internal stuff.

>  	}
>  
>  	if (fb) {
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 3f0c690..2be4414 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -404,6 +404,8 @@ struct drm_crtc_funcs {
>   * @cursor: cursor plane for this CRTC
>   * @cursor_x: current x position of the cursor, used for universal cursor planes
>   * @cursor_y: current y position of the cursor, used for universal cursor planes
> + * @hot_x: x-coordinate of cursor hotspot, used for universal cursor planes
> + * @hot_y: y-coordinate of cursor hotspot, used for universal cursor planes
>   * @enabled: is this CRTC enabled?
>   * @mode: current mode timings
>   * @hwmode: mode timings as programmed to hw regs
> @@ -445,6 +447,10 @@ struct drm_crtc {
>  	int cursor_x;
>  	int cursor_y;
>  
> +	/* hotspot of cursor */
> +	int hot_x;
> +	int hot_y;
> +
>  	bool enabled;
>  
>  	/* Requested mode from modesetting. */
> -- 
> 2.6.3.462.gbe2c914
> 
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-- 
Ville Syrjälä
Intel OTC