Re: [Gegl-developer] babl: format comparison
Vom: Sat, 21 May 2011 22:37:41 +
Hi,
what would be the best-practice to check if two BablFormats are the
same? I would need something like:
Babl *format1 = babl_format(R'G'B' u8);
Babl *format2 = babl_format(CIE Lab float);
if(is_same_format(format1, format2))
if (format1 == format2)
{ ... } else { ... }
But do note that internally babl will provide you with a memcpy
instead of a conversion if the passed in formats are the same; thus
yep, i've seen that.
this should only be neccesary if direct access with no copies
whatsoever is an option where used.
I don't quite understand. Without (my own) copies of the babl object?
Maybe types would be a better example. If I understand you right I can
do this:
Babl *format = babl_format(R'G'B' u8);
...
if(babl_format_get_type(format) == babl_type(u8))
{
/* u8 type */
}
else
{
/* no u8 type */
}
BablFishes never change their source nor destination formats, and at
the moment the source and destination formats of fishes are not
exposed bu the publicly installed headers for babl.
Then it looks like I have to remember the formats of all created fish
myself :(
best regards
--
rigid
printk(NULL POINTER IDIOT\n);
linux-2.6.6/drivers/media/dvb/dvb-core/dvb_filter.c
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Re: [Gegl-developer] babl: format comparison
On Sun, May 22, 2011 at 10:26 AM, Daniel Hiepler
ri...@boogiepalace.hopto.org wrote:
Vom: Sat, 21 May 2011 22:37:41 +
if(babl_format_get_type(format) == babl_type(u8))
{
/* u8 type */
}
else
{
/* no u8 type */
}
Yes, all Babl objects are effectively singletons - and the same
internal object will be returned for all subsequent calls that refer
to one.
BablFishes never change their source nor destination formats, and at
the moment the source and destination formats of fishes are not
exposed bu the publicly installed headers for babl.
Then it looks like I have to remember the formats of all created fish
myself :(
This depends on what you are trying to do, if all you are trying to do
is to avoid creating multiple fishes referring to the same two formats
than babl already does this for you internally. Just like pixel
formats and types, you should be getting the same fish, with
significantly less computation needed. On subsequent requests.
/Øyvind K.
--
«The future is already here. It's just not very evenly distributed»
-- William Gibson
http://pippin.gimp.org/ http://ffii.org/
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