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List:       vtkusers
Subject:    Re: [vtkusers] Loading images from memory *not files*
From:       Kenneth Porter <shiva () sewingwitch ! com>
Date:       2010-02-24 14:03:19
Message-ID: 6ECBF6A8E0D2A858079CFAB2 () [10 ! 170 ! 7 ! 6]
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--On Wednesday, February 24, 2010 10:06 AM +0000 Robert Haines 
<rhaines@manchester.ac.uk> wrote:

> Subject says it all really. I have an image (a PNG in this case but I'd
> like to be general here really) in memory and I'd like to use it in the
> normal VTK way - as if it had been read in by vtkPNGReader, for example.
> Is this possible? I've looked at the code for vtkPNGReader and it looks
> like the only way to read a PNG is from a file, which seems crazy! Have I
> missed something? Is there another way to do what I want?

vtkPNGReader under the hood uses libpng. You can hook directly into that. 
It supports reading from sources other than files, but you have to supply a 
suitable "input" routine. Search for "png_init_io" on this page:

<http://www.libpng.org/pub/png/libpng-manual.txt>


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