linux-kernel - Re: [PATCH v4 1/3] drm/rect: Add DRM_RECT

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Date:   Tue, 21 Jun 2022 13:13:18 +0300
From:   Jani Nikula <jani.nikula@...el.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        David Gow <davidgow@...gle.com>,
        José Expósito <jose.exposito89@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, magalilemes00@...il.com,
        David Airlie <airlied@...ux.ie>,
        Maíra Canal <maira.canal@....br>,
        Daniel Latypov <dlatypov@...gle.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        tales.aparecida@...il.com, Isabella Basso <isabbasso@...eup.net>,
        KUnit Development <kunit-dev@...glegroups.com>
Subject: Re: [PATCH v4 1/3] drm/rect: Add DRM_RECT_INIT() macro

On Tue, 21 Jun 2022, Thomas Zimmermann <tzimmermann@...e.de> wrote:
> Hi
>
> Am 21.06.22 um 11:38 schrieb David Gow:
>> On Tue, Jun 21, 2022 at 12:06 AM José Expósito
>> <jose.exposito89@...il.com> wrote:
>>>
>>> Add a helper macro to initialize a rectangle from x, y, width and
>>> height information.
>>>
>>> Reviewed-by: Jani Nikula <jani.nikula@...el.com>
>>> Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
>>> Signed-off-by: José Expósito <jose.exposito89@...il.com>
>>> ---
>> 
>> This looks good to me, though I have one minor concern about the macro
>> name. (But if it's okay with the DRM folks, which it seems to be, I
>> won't object.)
>> 
>> Either way,
>> Reviewed-by: David Gow <davidgow@...gle.com>
>> 
>>>   include/drm/drm_rect.h | 16 ++++++++++++++++
>>>   1 file changed, 16 insertions(+)
>>>
>>> diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
>>> index 6f6e19bd4dac..e8d94fca2703 100644
>>> --- a/include/drm/drm_rect.h
>>> +++ b/include/drm/drm_rect.h
>>> @@ -47,6 +47,22 @@ struct drm_rect {
>>>          int x1, y1, x2, y2;
>>>   };
>>>
>>> +/**
>>> + * DRM_RECT_INIT - initialize a rectangle from x/y/w/h
>>> + * @x: x coordinate
>>> + * @y: y coordinate
>>> + * @w: width
>>> + * @h: height
>>> + *
>>> + * RETURNS:
>>> + * A new rectangle of the specified size.
>>> + */
>>> +#define DRM_RECT_INIT(x, y, w, h) ((struct drm_rect){ \
>>> +               .x1 = (x), \
>>> +               .y1 = (y), \
>>> +               .x2 = (x) + (w), \
>>> +               .y2 = (y) + (h) })
>>> +
>> 
>> My only slight concern here is that it might be a little bit confusing
>> that a macro called DRM_RECT_INIT() accepts x/y/w/h, whereas the
>> actual struct drm_rect is x1/y1/x2/y2. If the macro were called
>> something like DRM_RECT_INIT_FROM_XYWH() or similar.
>
> The existing drm_rect_init() function uses xywh arguments. So the 
> current name is consistent with existing practice. I don't think we 
> refer to x2,y2 much, if ever.

Agreed, and if we initialized with x1,y1,x2,y2 we wouldn't need the
function/macro in the first place.

BR,
Jani.

>
> Best regards
> Thomas
>
>> 
>> 
>>>   /**
>>>    * DRM_RECT_FMT - printf string for &struct drm_rect
>>>    */
>>> --
>>> 2.25.1
>>>

-- 
Jani Nikula, Intel Open Source Graphics Center