[Intel-gfx] [PATCH 0/4] Adding support for plane alpha/color blending through drm property

[Daniel Vetter]

On Tue, Mar 25, 2014 at 03:33:42PM +0530, Sagar Arun Kamble wrote:
> Hi Damien,
> 
> Could you please clarify following queries.

He did, in a reply to your mail ...
-Daniel

> 
> Thanks,
> Sagar
> On Fri, 2014-03-21 at 19:06 +0530, Sagar Arun Kamble wrote:
> > Hi Damien,
> > 
> > On Thu, 2014-03-20 at 14:45 +0000, Damien Lespiau wrote:
> > > On Thu, Mar 20, 2014 at 02:11:40PM +0000, Damien Lespiau wrote:
> > > > (source is premultiplied)
> > > > 
> > > > RGBA = ADD(SRC_COLOR*SRC_ALPHA, DST_COLOR*ONE_MINUS_SRC_ALPHA)
> > > 
> > > Grr, copy/paste error. If the source is already premultiplied:
> > > 
> > > RGBA = ADD(SRC_COLOR, DST_COLOR*ONE_MINUS_SRC_ALPHA)
> > > 
> > 
> > 1. Currently there is no interface to advertise the DRM_FORMATS plane
> > supportes to user mode? Should we add new IOCTL for that and include
> > pre-multiplied alpha formats while advertising? Or am I missing any such
> > API already available?
> > 
> > 2. About constant alpha property - when we program constant alpha
> > register will hardware be able to take care of the blending as per
> > equations you have specified for non-premultiplied-alpha and
> > premultiplied-alpha cases or we have to do any additional setting?
> > Confusion is because of two combinations:
> > a. pre-multiplied alpha+constant alpha
> > b. non-pre-multiplied alpha+constant alpha
> > 
> > Kindly clarify.
> > 
> > thanks,
> > Sagar
> > 
> > 
> 
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch