linux-kernel - Re: [Intel-gfx] [PATCH v5 11/11] drm/i915: Calling rotate and inverse rotate transformations after clipping

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Date:	Tue, 11 Feb 2014 17:39:38 +0530
From:	Sagar Arun Kamble <sagar.a.kamble@...el.com>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>, intel-gfx@...ts.freedesktop.org,
	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH v5 11/11] drm/i915: Calling rotate and
 inverse rotate transformations after clipping

On Tue, 2014-02-11 at 12:59 +0100, Daniel Vetter wrote:
> On Tue, Feb 11, 2014 at 05:02:31PM +0530, Sagar Arun Kamble wrote:
> > On Mon, 2014-02-10 at 15:32 +0200, Ville Syrjälä wrote:
> > > On Mon, Feb 10, 2014 at 01:01:18PM +0530, sagar.a.kamble@...el.com wrote:
> > > > From: Sagar Kamble <sagar.a.kamble@...el.com>
> > > > 
> > > > With clipped sprites these transformations are not working. these
> > > > functions transform complete sprite irrespective of clipping present.
> > > > This leads to invisible portion of sprite show up when rotate 180 if
> > > > it was out of visible area before.
> > > > 
> > > > v4: Moved rotate transform for source rectangle after clipping.
> > > > Added rotate and inverse rotate transform for destination rect.
> > > 
> > > Still NAK.
> > > 
> > > I just pushed rotation support to my glplane test app [1], and with
> > > with that my rotated clipping code works exactly as intended.
> > > 
> > > [1] git://gitorious.org/vsyrjala/glplane.git
> > I tried this app. I think I am considering 180 degree rotation of
> > clipped sprite plane differently. I have captured output with these
> > rotate transforms moved before(clip-rotated) and after(rotate-clipped)
> > clipping code.
> > 
> > Which is valid? Rotating entire sprite and then clipping or Rotating
> > clipped portion?
> > 
> > Reference and Rotated output is attached FYI.
> > 
> > If rotating entire sprite is correct then this patch 11/11 is not needed
> > and can be abandoned.
> 
> I think doing the clipping first (as a viewport) and then rotating the
> viewport makes more sense to me. Dunno what other people think, but I
> guess we should document that somewhere.
> -Daniel

Agree. Thought of use-case where if media player(that will use sprite
for video) is moved such that it is off the screen partially, after
rotation as well we should see same portion of clip inside(rotated
though).

> 
> > 
> > thanks,
> > Sagar
> > > > 
> > > > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > > > Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> > > > Cc: David Airlie <airlied@...ux.ie>
> > > > Cc: dri-devel@...ts.freedesktop.org
> > > > Cc: linux-kernel@...r.kernel.org
> > > > Cc: vijay.a.purushothaman@...el.com
> > > > Signed-off-by: Sagar Kamble <sagar.a.kamble@...el.com>
> > > > ---
> > > >  drivers/gpu/drm/i915/intel_sprite.c | 16 ++++++++++++----
> > > >  1 file changed, 12 insertions(+), 4 deletions(-)
> > > > 
> > > > diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> > > > index 62b9f84..799f6a9 100644
> > > > --- a/drivers/gpu/drm/i915/intel_sprite.c
> > > > +++ b/drivers/gpu/drm/i915/intel_sprite.c
> > > > @@ -769,9 +769,6 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> > > >  	max_scale = intel_plane->max_downscale << 16;
> > > >  	min_scale = intel_plane->can_scale ? 1 : (1 << 16);
> > > >  
> > > > -	drm_rect_rotate(&src, fb->width << 16, fb->height << 16,
> > > > -			intel_plane->rotation);
> > > > -
> > > >  	hscale = drm_rect_calc_hscale_relaxed(&src, &dst, min_scale, max_scale);
> > > >  	BUG_ON(hscale < 0);
> > > >  
> > > > @@ -785,6 +782,13 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> > > >  	crtc_w = drm_rect_width(&dst);
> > > >  	crtc_h = drm_rect_height(&dst);
> > > >  
> > > > +	drm_rect_rotate(&src, fb->width << 16, fb->height << 16,
> > > > +				intel_plane->rotation);
> > > > +
> > > > +	drm_rect_rotate(&dst, intel_crtc->config.pipe_src_w,
> > > > +				intel_crtc->config.pipe_src_h,
> > > > +				intel_plane->rotation);
> > > > +
> > > >  	if (visible) {
> > > >  		/* check again in case clipping clamped the results */
> > > >  		hscale = drm_rect_calc_hscale(&src, &dst, min_scale, max_scale);
> > > > @@ -811,7 +815,11 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> > > >  				     drm_rect_height(&dst) * vscale - drm_rect_height(&src));
> > > >  
> > > >  		drm_rect_rotate_inv(&src, fb->width << 16, fb->height << 16,
> > > > -				    intel_plane->rotation);
> > > > +					intel_plane->rotation);
> > > > +
> > > > +		drm_rect_rotate_inv(&dst, intel_crtc->config.pipe_src_w,
> > > > +					intel_crtc->config.pipe_src_h,
> > > > +					intel_plane->rotation);
> > > >  
> > > >  		/* sanity check to make sure the src viewport wasn't enlarged */
> > > >  		WARN_ON(src.x1 < (int) src_x ||
> > > > -- 
> > > > 1.8.5
> > > > 
> > > > _______________________________________________
> > > > Intel-gfx mailing list
> > > > Intel-gfx@...ts.freedesktop.org
> > > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > > 
> > 
> 
> 
> 
> 
> 
> 

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