From: Christian Henning (chhenning_at_[hidden])
Date: 2008-05-01 22:07:42
Hi John,
I have added the necessary this-> to hopefully make the lib compile
with gcc now. Can you pull the latest and try again?
> any_supported_image<jpeg_tag> result;
> read_image(fname, result, jpeg_tag())
>
> gil::apply_operation(result, my_operation)
Ah, I see. Nice idea, I will add it to my todo list.
>
>
>
> On another note, I dont think you need filesystem to check the extension
> of the images. You can use the boost string algorithms library (or just
> use std::string operations).
>
> bool can_read(std::string filename, jpeg_tag const& ){
> static const string extensions[] = {".jpg", ".jpeg" };
> return ::boost::algorithm::iends_with(filename, extensions[0])
> || ::boost::algorithm::iends_with(filename, extensions[1]);
> }
>
You're right. This should work, as well. Thanks!
>
> Also, I beleive some of the image formats can peek at the first few
> bytes of the file to determine if the format is appropriate. I dont know
> about non-windows systems, but on some of them this might be the only
> way to tell. If that is the way image formats are checked, then I dont
> think filesystem (or string algs) is going to be important.
For now, I believe the file extension will do.
Thanks again,
Christian