[igt-dev] [PATCH i-g-t 3/8] lib/fb: Handle planar formats in igt_calc_fb_size and create_bo_for_fb

[Maarten Lankhorst]

Op 26-01-18 om 11:24 schreef Mika Kahola:
> On Fri, 2018-01-26 at 11:20 +0100, Maarten Lankhorst wrote:
>> Op 26-01-18 om 10:00 schreef Mika Kahola:
>>> On Tue, 2018-01-23 at 13:56 +0100, Maarten Lankhorst wrote:
>>>> By adding support for planar formats to igt_calc_fb_size and
>>>> create_bo_for_fb,
>>>> we can calculate dimensions and create backing storage for planar
>>>> framebuffers.
>>>>
>>>> This is required for adding support to create planar framebuffers
>>>> in
>>>> the next patch.
>>>>
>>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.c
>>>> om>
>>>> ---
>>>>  lib/igt_fb.c | 168 +++++++++++++++++++++++++++++++++++++++++++
>>>> ----
>>>> ------------
>>>>  1 file changed, 123 insertions(+), 45 deletions(-)
>>>>
>>>> diff --git a/lib/igt_fb.c b/lib/igt_fb.c
>>>> index da07d1a9e21f..6a331f06724b 100644
>>>> --- a/lib/igt_fb.c
>>>> +++ b/lib/igt_fb.c
>>>> @@ -54,14 +54,16 @@
>>>>   */
>>>>  
>>>>  /* drm fourcc/cairo format maps */
>>>> -#define DF(did, cid, _bpp, _depth)	\
>>>> -	{ DRM_FORMAT_##did, CAIRO_FORMAT_##cid, # did, _bpp,
>>>> _depth
>>>> }
>>>> +#define DF(did, cid, ...)	\
>>>> +	{ DRM_FORMAT_##did, CAIRO_FORMAT_##cid, # did,
>>>> __VA_ARGS__ }
>>>>  static struct format_desc_struct {
>>>>  	uint32_t drm_id;
>>>>  	cairo_format_t cairo_id;
>>>>  	const char *name;
>>>>  	int bpp;
>>>>  	int depth;
>>>> +	int planes;
>>>> +	int plane_bpp[4];
>>> should we define a max value for this instead of hardcoded one?
>> 4 planes is the maximum ever. Alpha, R, G and B.
> Yes, but even so I'm not really a fan of harcoded values.
Only the array definitions use those values. There aren't even planar formats that support > 4 planes,
and uapi/drm/drm_mode.h also uses 4 everywhere. It's fine unless we everextend the kernel api to support
more than 4 planes, but this is very unlikely since the hw doesn't even exist. I think it's fine to hardcode this. All users use ARRAY_SIZE or sizeof as appropriate, so it won't matter much.

~Maarten