Re: [Swftools-common] buggy pdf2sw conversion?

[Pablo Rodríguez]

On 02/12/2011 12:10 AM, Chris wrote:
> On Fri, 11 Feb 2011 21:49:55 +0100 Pablo Rodríguez<address@hidden>  wrote:
>
> > And there is the issues that I cannot explain: why advancing slides is
> > almost negligible and going back takes so long?
>
> I think I can.  The quote given below is from the page 29 of the SWF File
> Format Spec v10:
>
> <snip>
> 'The contents of the first frame are the cumulative effect of performing all
> of the control tag operations before the ShowFrame Tag ..'
>
> which is the point when you see the rendered result on-screen,
>
> 'The contents of the second frame are the cumulative effect of performing
> all of the control tag operations from *the beginning of the file to the
> second* ShowFrame Tag, and so on.'
> </snip>
>
> Now you know why there is a massive delay.  It's a bit like having to re-
> read all the currently read pages of a book, just to assimilate the next
> one.  If it happens to be relatively large book ( file ), then not to put
> a finer point on it, you are up jolly old this creek without the aid
> paddle.

Thanks for your patient explanation, Chris.

But I'm afraid I miss something essential, because I don't get it.

If frame displaying is cumulative, advancing frames should be slower 
than going back to previous frames, because there is (one or more 
frames) less to read. And this isn't the case.

Sorry, I must be missing something, but what I understand from your 
explanation is the opposite conclusion.

What am I getting wrong?

Many thanks again,


Pablo
--
http://www.ousia.tk