[PATCH v2 12/43] drm/fourcc: Add format helpers for checking YUV sub-sampling

[Paul Kocialkowski]

Hi,

On Fri, 2018-11-23 at 19:23 +0200, Ville Syrjälä wrote:
> On Fri, Nov 23, 2018 at 04:55:33PM +0000, Ayan Halder wrote:
> > On Fri, Nov 23, 2018 at 10:24:44AM +0100, Paul Kocialkowski wrote:
> > 
> > Hi Paul,
> > 
> > > This introduces new format helpers that use the previously-introduced
> > > format info helpers for checking YUV sub-sampling.
> > > 
> > > Only the format fourcc is required by these helpers and the formats are
> > > iterated from the list.
> > > 
> > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski at bootlin.com>
> > > ---
> > >  drivers/gpu/drm/drm_fourcc.c | 105 +++++++++++++++++++++++++++++++++++
> > >  include/drm/drm_fourcc.h     |   5 ++
> > >  2 files changed, 110 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> > > index b56e773f9f63..6d395c586ad5 100644
> > > --- a/drivers/gpu/drm/drm_fourcc.c
> > > +++ b/drivers/gpu/drm/drm_fourcc.c
> > > @@ -492,6 +492,111 @@ bool drm_format_is_yuv_planar(uint32_t format)
> > >  }
> > >  EXPORT_SYMBOL(drm_format_is_yuv_planar);
> > >  
> > > +/**
> > > + * drm_format_is_yuv_sampling_410 - check that the format is a YUV format with
> > > + * 4:1:0 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:1:0
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_410(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> 
> Looks like you're doing a lot of drm_format_info(fb->format->format),
> which doesn't make sense. Not to mention that each lookup is a linear
> search so the costs may start to add up.
> 
> Unless there's a really good reason I'd rather we try to remove all
> the current helpers that do these lookups, and not add any more.

I totally agree that we should be passing the drm_format_info structure
onwards to all the driver helpers so we don't have to do the lookup each
time.

I thought it was still somewhat acceptable to have lookup fashions of
these format helpers, but I am totally in favor of getting rid of them
(and other lookup helpers eventually).

I'll remove the lookup YUV format helpers and convert this series to
passing the full drm_format_info everywhere needed.

Cheers,

Paul

> > > +
> > > +	return drm_format_info_is_yuv_sampling_410(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_410);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_411 - check that the format is a YUV format with
> > > + * 4:1:1 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:1:1
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_411(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_411(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_411);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_420 - check that the format is a YUV format with
> > > + * 4:2:0 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:2:0
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_420(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_420(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_420);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_422 - check that the format is a YUV format with
> > > + * 4:2:2 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:2:2
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_422(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_422(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_422);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_444 - check that the format is a YUV format with
> > > + * 4:4:4 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:4:4
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_444(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_444(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_444);
> > > +
> > >  /**
> > >   * drm_format_info_block_width - width in pixels of block.
> > >   * @info: pixel format info
> > > diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> > > index d170b7b323f7..cf082d8b6ad4 100644
> > > --- a/include/drm/drm_fourcc.h
> > > +++ b/include/drm/drm_fourcc.h
> > > @@ -278,6 +278,11 @@ bool drm_format_is_yuv(uint32_t format);
> > >  bool drm_format_is_yuv_packed(uint32_t format);
> > >  bool drm_format_is_yuv_semiplanar(uint32_t format);
> > >  bool drm_format_is_yuv_planar(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_410(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_411(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_420(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_422(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_444(uint32_t format);
> > >  unsigned int drm_format_info_block_width(const struct drm_format_info *info,
> > >  					 int plane);
> > >  unsigned int drm_format_info_block_height(const struct drm_format_info *info,
> > > -- 
> > > 2.19.1
> > > 
> > From patches [PATCH v2 08/43] till [PATCH v2 12/43], looks good to me.
> > 
> > How about clubbing all the drm_format_helper functions together in a
> > separate file (call it drm_fourcc_helper.c)? This way, we could
> > keep the __drm_format_info[] only drm_fourcc.c.
> > 
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel at lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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