linux-kernel - Re: [PATCH 2/5] drm/format-helper: Fix XRGB888 to monochrome conversion

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Date:   Tue, 15 Mar 2022 15:39:42 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Noralf Trønnes <noralf@...nnes.org>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] drm/format-helper: Fix XRGB888 to monochrome
 conversion

On Tue, Mar 15, 2022 at 01:18:00PM +0100, Javier Martinez Canillas wrote:
> On 3/15/22 12:07, Geert Uytterhoeven wrote:

> > +		for (i = 0; i < bits; i++, pixels--) {
> 
> I think is worth to add a comment here explaining that the pixel is set to
> 1 for brightness > 127 and to 0 for brightness < 128. Or as kernel-doc for
> this helper function.
> 
> > +			if (*src++ & BIT(7))
> 
> Pekka also mentioned that if (*src++ > 127) would make this easier to read.

>= 128 ?

> > +				byte |= BIT(i);
> >  		}
> >  		*dst++ = byte;
> >  	}

-- 
With Best Regards,
Andy Shevchenko