linux-kernel - Re: [PATCH] drm/qxl: fix cursor position with non-zero hotspot

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Message-ID: <20151203104607.1a9a757a.john@metanate.com>
Date:	Thu, 3 Dec 2015 10:46:07 +0000
From:	John Keeping <john@...anate.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	Daniel Vetter <daniel@...ll.ch>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	Michel Dänzer <michel.daenzer@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/qxl: fix cursor position with non-zero hotspot

On Wed, 18 Nov 2015 13:58:23 +0100, Daniel Vetter wrote:

> On Wed, Nov 18, 2015 at 11:17:25AM +0000, John Keeping wrote:
> > The SPICE protocol considers the position of a cursor to be the
> > location of its active pixel on the display, so the cursor is drawn
> > with its top-left corner at "(x - hot_spot_x, y - hot_spot_y)" but
> > the DRM cursor position gives the location where the top-left
> > corner should be drawn, with the hotspot being a hint for drivers
> > that need it.
> > 
> > This fixes the location of the window resize cursors when using
> > Fluxbox with the QXL DRM driver and both the QXL and modesetting X
> > drivers.
> > 
> > Signed-off-by: John Keeping <john@...anate.com>
> > ---
> > This comes from the discussion in the thread at [1].  My test
> > environment is using:
> > 
> >     - X.Org X Server 1.17.4
> >     - xf86-video-qxl 0.1.4
> >     - spice-gtk3 0.30
> > 
> > [1]
> > http://lists.freedesktop.org/archives/dri-devel/2015-November/thread.html#94650
> > 
> >  drivers/gpu/drm/qxl/qxl_display.c | 13 +++++++++----
> >  drivers/gpu/drm/qxl/qxl_drv.h     |  2 ++
> >  2 files changed, 11 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/qxl/qxl_display.c
> > b/drivers/gpu/drm/qxl/qxl_display.c index 183aea1..5edebf4 100644
> > --- a/drivers/gpu/drm/qxl/qxl_display.c
> > +++ b/drivers/gpu/drm/qxl/qxl_display.c
> > @@ -375,10 +375,15 @@ static int qxl_crtc_cursor_set2(struct
> > drm_crtc *crtc, 
> >  	qxl_bo_kunmap(user_bo);
> >  
> > +	qcrtc->cur_x += qcrtc->hot_spot_x - hot_x;
> > +	qcrtc->cur_y += qcrtc->hot_spot_y - hot_y;
> > +	qcrtc->hot_spot_x = hot_x;
> > +	qcrtc->hot_spot_y = hot_y;  
> 
> Yay for the artificial split of the legacy driver interface for
> cursors.
> 
> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: stable@...r.kernel.org
> 
> Dave, can you pls pick this up if you agree?

Ping?

> > +
> >  	cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev,
> > release); cmd->type = QXL_CURSOR_SET;
> > -	cmd->u.set.position.x = qcrtc->cur_x;
> > -	cmd->u.set.position.y = qcrtc->cur_y;
> > +	cmd->u.set.position.x = qcrtc->cur_x + qcrtc->hot_spot_x;
> > +	cmd->u.set.position.y = qcrtc->cur_y + qcrtc->hot_spot_y;
> >  
> >  	cmd->u.set.shape = qxl_bo_physical_address(qdev,
> > cursor_bo, 0); 
> > @@ -441,8 +446,8 @@ static int qxl_crtc_cursor_move(struct drm_crtc
> > *crtc, 
> >  	cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev,
> > release); cmd->type = QXL_CURSOR_MOVE;
> > -	cmd->u.position.x = qcrtc->cur_x;
> > -	cmd->u.position.y = qcrtc->cur_y;
> > +	cmd->u.position.x = qcrtc->cur_x + qcrtc->hot_spot_x;
> > +	cmd->u.position.y = qcrtc->cur_y + qcrtc->hot_spot_y;
> >  	qxl_release_unmap(qdev, release, &cmd->release_info);
> >  
> >  	qxl_push_cursor_ring_release(qdev, release,
> > QXL_CMD_CURSOR, false); diff --git a/drivers/gpu/drm/qxl/qxl_drv.h
> > b/drivers/gpu/drm/qxl/qxl_drv.h index 01a8694..3ab9017 100644
> > --- a/drivers/gpu/drm/qxl/qxl_drv.h
> > +++ b/drivers/gpu/drm/qxl/qxl_drv.h
> > @@ -135,6 +135,8 @@ struct qxl_crtc {
> >  	int index;
> >  	int cur_x;
> >  	int cur_y;
> > +	int hot_spot_x;
> > +	int hot_spot_y;
> >  };
> >  
> >  struct qxl_output {
> > -- 
> > 2.6.3.462.gbe2c914
> >   
> 
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