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Message-ID: <20151117155943.1e83b053.john@metanate.com>
Date: Tue, 17 Nov 2015 15:59:43 +0000
From: John Keeping <john@...anate.com>
To: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2] drm: support hotspot for universal plane cursors
On Tue, 17 Nov 2015 17:39:32 +0200, Ville Syrjälä wrote:
> 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@...anate.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?
hot_{x,y} specify the location of the active pixel within the cursor
plane and cursor_{x,y} specify the location of the active pixel on the
display so we need to offset the plane position in order for the active
pixel to be in the correct place.
> > }
> >
> > 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
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@...ts.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/dri-devel
>
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