Re: Binding to C

["Patrice Freydiere" <frett27@free.fr>]

On Tue, 12 Aug 2003 00:49:20 +0100, chris wrote:

> Patrice Freydiere wrote:
> 
>> so it can gives you some ideas for C binding from ADA.
> 
> Thanks.
> 
> 
>> ps: when i started writing the simplejpeglib binding for ADA.
>> i had a lot of interfacing problems du to the portability macros of the
>> jpeglib. (it's surely possible, but when i've started my binding, my C
>> interfacing Skills from ADA was poor).
>> So i decided in my design to build a simple C interface to make Ada
>> binding easier. This permit me to be "C structure independent" and provide a
>> more easy upgrade of the jpeglib.
> 
> This is a problem... and I haven't found a *convienant* way to solve 
> this (other than wrapping it up as you and Warren pointed out - thanks). 
>   Macros change this, that and the other.  My ada code would need to be 
> changed at the spec level on different platforms, compilers, etc... 
> yuck.  A more experienced Ada developer could probably organise it 
> better, but
> 
> All I really want to do now is *decode* and encode (at various 
> qualities) a jpeg (in RBG).  Later things might get more complicated, 
> but for now that's it.  I'm going to look at your lib again now I've got 
> a bit more time.

chris, it's difficult to add a quality parameter to SimpleJpegLib.
The SimpleJpegLib, gives you the RGB values of an encoded JPEG File.

Patrice