[Image-SIG] DPX decoder support

[Mike Yurick]

Hi there,

I'd like to write a DPX decoder for the PIL library.  I'm looking at the 
"Writing Your Own File Decoder" section, and I've written an image 
plugin which happily reads in all the necessary header data in the _open 
function.  The DPXs I'm currently working with have 10bit unsigned RGB 
channels (although the DPX spec allows for a lot of flexibility).  I'm 
looking at the 'bit' decoder provided, but it' doesn't appear to have 
the flexibility to specify that each 32bit element of the DPX data would 
be read as 3 unsigned 10bit RGB channels.  The docs indicate a parameter 
for the number of bits per pixel, and padding per line, but I'm not 
seeing how this would allow for the spec mentioned above.  This of 
course doesn't account for the log to lin conversion typicaly applied, 
either.  Also, looking at decode.c, the BIT decoder appears to only 
support "F" image mode.  Are there additional python functions in this 
framework that I can implement in order to support such flexibility in 
reading the 10 bits per channel data?  Or am I going to have to 
implement appropriate c code?

Thanks,

-mike


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