Help on drmModeSetPlane

[Ville Syrjälä]

On Fri, Apr 17, 2015 at 09:30:02AM +0000, Xie, William wrote:
> Hello
> 
> Does overlay support alpha?

Depends on the hardware once more. Also we don't have a proper API for
it at this time. You may get lucky if you tell it to use a pixel format
with alpha. But there's no guarantee what kind of blend equation you
will get.

Also we don't really have an API for the plane Z order either. Some
drivers have a property for that, but I don't think it's really well
defined.

> 
> William
> 
> -----Original Message-----
> From: Ville Syrjälä [mailto:ville.syrjala at linux.intel.com] 
> Sent: Wednesday, April 15, 2015 10:34 PM
> To: Xie, William
> Cc: DRI Development
> Subject: Re: Help on drmModeSetPlane
> 
> On Wed, Apr 15, 2015 at 02:24:14PM +0000, Xie, William wrote:
> > Oh, I tried it on BDW.
> > So we need to use other way to scale the video to full screen?
> 
> Yes, unfortunately.
> 
> > 
> > William
> > 
> > 
> > -----Original Message-----
> > From: Ville Syrjälä [mailto:ville.syrjala at linux.intel.com]
> > Sent: Wednesday, April 15, 2015 7:23 PM
> > To: Xie, William
> > Cc: DRI Development
> > Subject: Re: Help on drmModeSetPlane
> > 
> > On Wed, Apr 15, 2015 at 08:49:39AM +0000, Xie, William wrote:
> > > To make it more specific,
> > > 
> > > For example:
> > > 1: video frame size is 1280x720,
> > > 2: screen resolution is 3200x1800,
> > > 
> > > How can I set crtc and src parameters?
> > > 
> > > 1: crtc (0, 0, 3200, 1800)  src (0, 0, 3200<<16, 1800<<16)
> > > 2: crtc (0, 0, 3200, 1800)  src (0, 0, 1280<<16, 720<<16)
> > > 
> > > Which one is correct?
> > 
> > 2 is correct.
> > 
> > What hardware are you trying this on? Do note that on HSW/BDW/VLV/CHV the hardware lost the plane scaling ability. It's coming back on SKL.
> > 
> > > 
> > > William
> > > 
> > > From: Xie, William
> > > Sent: Wednesday, April 15, 2015 3:55 PM
> > > To: DRI Development; DRI Development
> > > Subject: Help on drmModeSetPlane
> > > 
> > > Question please, could someone share the meaning of the parameters for drmModeSetPlane in libdrm?
> > > 
> > > int drmModeSetPlane(int fd, uint32_t plane_id, uint32_t crtc_id,
> > >                                     uint32_t fb_id, uint32_t flags,
> > >                                     int32_t crtc_x, int32_t crtc_y,
> > >                                     uint32_t crtc_w, uint32_t crtc_h,
> > >                                     uint32_t src_x, uint32_t src_y,
> > >                                     uint32_t src_w, uint32_t src_h)
> > > 
> > > 
> > > My problem is, whatever value I set, the video is not full screen 
> > > mode, Anything I missed?
> > > 
> > > Thanks
> > > William
> > > 
> > > 
> > > 
> > > 
> > 
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/dri-devel
> > 
> > 
> > --
> > Ville Syrjälä
> > Intel OTC
> 
> --
> Ville Syrjälä
> Intel OTC

-- 
Ville Syrjälä
Intel OTC