pure D JPEG decoder, with progressive JPEG support, public domain

[ketmar via Digitalmars-d-announce]

On Friday, 17 June 2016 at 13:51:29 UTC, Andrei Alexandrescu 
wrote:
> Nice, thanks for this work. I see it has 3213 lines. I take it 
> the source is https://github.com/richgel999/jpeg-compressor. 
> How many lines from there are reflected in the D code? -- Andrei

it's a complete port of jpegd.h+jpegd.cpp (so, no encoder). it is 
almost 1:1 to c++ code, including fancy templated row/col 
decoders and 4x4 matrix mini-class. mostly sed work, and after i 
made it to compile (and fixed silly bug in CLAMP that i 
introduced) it "just works". i replaced stream reader class with 
delegate (we have such a great delegates in D, so let's use 'em! 
;-), but otherwise the code is unmodified.

ah, i also put `.ptr` to array access to skip bounds checking -- 
i love to build my code with bounds checking on, and i don't feel 
that i need it in this decoder -- it should be fairly well-tested.

so you may assume that all of the lines there are came from c++ 
(sans some curly brackets).

of course, one can do much better work by writing "idiomatic" D 
code, i guess, but that would be much greater work -- not a 
"port", but "rewrite".