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Re: [Openexr-devel] Changing multipart reading
From: |
Peter Hillman |
Subject: |
Re: [Openexr-devel] Changing multipart reading |
Date: |
Wed, 23 Apr 2014 10:12:24 +1200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
I'm not clear what advantage you have doing this?
I tend not to store InputPart objects. Instead, when reading multiple
parts I do something like this:
for(int partnum=0 ; partnum<muiltipartfile.parts() ; ++partnum )
{
InputPart(multipartfile,partnum).setFrameBuffer(...)
}
for(int partnum=0 ; partnum<muiltipartfile.parts() ; ++partnum )
{
InputPart(multipartfile,partnum).readPixels(...)
}
The '...Part' types are effectively shared pointers to hidden '...File'
objects maintained in the MultiPart object, with one '..File' object per
part.
The '...File' object is created the first time a '...Part' object is
initialized. Subsequent '...Part' objects constructed on the same part
point to the same hidden File object, which makes the constructor fast,
and also means that setFrameBuffer is persistent for each part in the file.
So it seems like instead of keeping an InputPart object around and
modifying the part it is accessing, you could just keep the
MultiPartInputFile object around, and create temporary InputPart objects
as you need them.
On 23/04/14 02:29, Gonzalo Garramuno wrote:
I was wondering if there was a way to change the multipart being read
from InputPart. Or can I make the request to have that added.
Currently only the constructor receives the multipart to read and
there's no way to change it other than instantiating another InputPart.
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