Re: [boost] GIL io_new review

Subject: Re: [boost] GIL io_new review
From: Phil Endecott (spam_from_boost_dev_at_[hidden])
Date: 2010-12-13 11:19:08

Lubomir Bourdev wrote:
> If your input is not a stream, the code doesn't use streams; it 
> operates straight to FILE*. But if you start with a stream, then 
> it uses a stream.

"Not a stream" does not always imply that it's a file.  The case that 
I, and I think Domagoj, would like to see handled better is when the 
data is in memory.  For example, libjpeg has a function jpeg_mem_src() 
which could be used as follows:

void read_jpeg_image_from_mem(const char* begin, const char* end, 
gil::image dest)
{
   .....
   jpeg_mem_src(...., begin, end-begin);
   .....
}

So there is basically no overhead.  Wrapping a block of memory up in a 
stream, and then unwrapping it again to pass it to the image library's 
C API, and pulling in another Boost library like Boost.IOStreams to do 
so, looks like overkill.

Regards,  Phil.