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From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
	Jyri Sarha <jsarha@ti.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v3 09/15] drm: tilcdc: Replace drm_fb_get_bpp_depth() with drm_format_plane_cpp()
Date: Fri, 10 Jun 2016 15:26:30 +0300	[thread overview]
Message-ID: <575AB1F6.4040805@ti.com> (raw)
In-Reply-To: <20160610122310.GJ4329@intel.com>


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On 10/06/16 15:23, Ville Syrjälä wrote:
> On Fri, Jun 10, 2016 at 03:08:18PM +0300, Tomi Valkeinen wrote:
>> On 10/06/16 15:05, Ville Syrjälä wrote:
>>
>>>> I'm not sure what's the common way, but tilcdc doesn't support alpha.
>>>> ARGB works, of course, by ignoring A, but... If an userspace app creates
>>>> ARGB buffer, does the app expect alpha to work?
>>>
>>> I think what we decided a while ago (at least for i915, but would be good
>>> to use the same convention everywhere) was that ARGB will be assumed to be
>>> pre-multiplied and will enable blending using 1.0*sc+(1.0-sa)*dc as the
>>> function. There have been some efforts at defining some new properties to
>>> control the blend equation, but I guess those got bogged down again.
>>
>> Ok, but that's a bit different topic. The question here is, if the HW
>> doesn't support alpha (no planes, so nothing to blend), should it accept
>> ARGB or not.
> 
> What do you mean "no planes"? You have to have a plane if you want
> to scanout a framebuffer. And even if you have just one plane with
> alpha blending, it should be blended with the background color
> (which is black until we get a property to change it).

I mean there's only the crtc with fb. So yes, one plane if you want to
call that a plane. The HW does not support any kind of blending to black
or to anything else.

 Tomi


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  reply	other threads:[~2016-06-10 12:26 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-08 23:32 [PATCH v3 00/15] Centralize format information Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 01/15] drm: Move format-related helpers to drm_fourcc.c Laurent Pinchart
2016-06-09  8:36   ` Daniel Vetter
2016-06-09  9:54     ` [PATCH v3.1 " Laurent Pinchart
2016-06-09 10:03       ` Daniel Vetter
2016-06-08 23:32 ` [PATCH v3 02/15] drm: Centralize format information Laurent Pinchart
2016-06-09  8:52   ` Daniel Vetter
2016-06-09 12:23     ` Ville Syrjälä
2016-06-09 12:40       ` Daniel Vetter
2016-06-09 13:05         ` Ville Syrjälä
2016-06-09 13:29           ` Daniel Vetter
2016-06-09 14:13             ` Ville Syrjälä
2016-09-08 13:49               ` Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 03/15] drm: Implement the drm_format_*() helpers as drm_format_info() wrappers Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 04/15] drm: Use drm_format_info() in DRM core code Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 05/15] drm: WARN when calling drm_format_info() for an unsupported format Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 06/15] drm: msm: Replace drm_fb_get_bpp_depth() with drm_format_plane_cpp() Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 07/15] drm: sti: " Laurent Pinchart
2016-06-09  7:52   ` Vincent ABRIOU
2016-06-09  9:17     ` Laurent Pinchart
2016-06-09 12:10       ` Vincent ABRIOU
2016-06-08 23:32 ` [PATCH v3 08/15] drm: hdlcd: " Laurent Pinchart
2016-06-09  9:01   ` Liviu Dudau
2016-07-25 11:10     ` Liviu Dudau
2016-09-08 14:45       ` Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 09/15] drm: tilcdc: " Laurent Pinchart
2016-06-10 11:51   ` Tomi Valkeinen
2016-06-10 12:05     ` Ville Syrjälä
2016-06-10 12:08       ` Tomi Valkeinen
2016-06-10 12:23         ` Ville Syrjälä
2016-06-10 12:26           ` Tomi Valkeinen [this message]
2016-06-10 12:29             ` Ville Syrjälä
2016-06-10 12:48               ` Tomi Valkeinen
2016-06-10 13:08                 ` Tomi Valkeinen
2016-06-10 13:16                   ` Jyri Sarha
2016-06-10 13:25                     ` Ville Syrjälä
2016-06-10 14:21                       ` Daniel Vetter
2016-06-10 12:07     ` Laurent Pinchart
2016-06-10 12:08     ` [PATCH v3.1 " Laurent Pinchart
2016-06-10 12:21       ` Tomi Valkeinen
2016-06-08 23:32 ` [PATCH v3 10/15] drm: cirrus: " Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 11/15] drm: gma500: Replace drm_fb_get_bpp_depth() with drm_format_info() Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 12/15] drm: amdgpu: Replace drm_fb_get_bpp_depth() with drm_format_plane_cpp() Laurent Pinchart
2016-06-09  1:42   ` Michel Dänzer
2016-06-09  9:18     ` Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 13/15] drm: radeon: " Laurent Pinchart
2016-06-08 23:32 ` [PATCH v3 14/15] drm: vmwgfx: Replace drm_fb_get_bpp_depth() with drm_format_info() Laurent Pinchart
2016-06-27 17:51   ` Sinclair Yeh
2016-06-08 23:32 ` [PATCH v3 15/15] drm: Don't export the drm_fb_get_bpp_depth() function Laurent Pinchart
  -- strict thread matches above, loose matches on Subject: below --
2016-06-08 23:30 [PATCH v3 00/15] Centralize format information Laurent Pinchart
2016-06-08 23:31 ` [PATCH v3 09/15] drm: tilcdc: Replace drm_fb_get_bpp_depth() with drm_format_plane_cpp() Laurent Pinchart

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