[poppler] Reading code for FUN

[thomas.huxhorn at web.de]

Hi Oliver,

HAHA that is so true with the C++ Standard. It's a complete different
language to describe a programming language.

I found a sample of Leonard book, it looks really good. First he
introduce "Objects" which could be int, arrays, dicts etc. and there is
a class "Object" in the code which implement this :) In C++ 2017 there
is a new class "variant" which does pretty much the same a class Object.
To replace Object with std::variant... that's the kind of fun I'm
talking about :)

Thomas

On 6/17/21 10:13 AM, Oliver Sander wrote:
> Hi Thomas,
>
> aller Anfang ist schwer.  Stick to it and it will seem easier
> after a while.  You may want to look at Leonard Rosenthol's
> book about pdf, but the standard itself is actually quite
> readable (compared to, say, the C++ standard).
>
> Best,
> Oliver
>
> On 13.06.21 11:51, thomas.huxhorn at web.de wrote:
>> Hello,
>>
>> I always wonder why it takes so long to display big pictures in PDF
>> files on linux. So I recompile poppler with release+debug symbols and
>> use valgrind profile to get an idea what is happening there. As I can
>> see, 50% of the CPU ticks are used to copy data from A to B. But without
>> knowing the code, its hard to say if this is good or not.
>> So I start reading the code. Puh it's hard to understand, so I start
>> reading the PDF reference too.
>>
>> As far I can see, there a linearized PDFs and and a table called xref.
>> Not much for one week of reading ;)
>>
>> Perhaps I should start from scratch and write my own PDF reader to
>> understand things better.
>>
>> If you are interested in, I can inform you about my progress. I'll do
>> this in my free time, so no hurry.
>>
>> Thomas H.
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>