[poppler] pdftops creates huge file with simple color background (attached examples)

[William Bader]

I looked at it a little, and I merged the LZW from xpdf 3.04 into poppler.
In LZWEncoder, I changed getBlock(buf, len) to doGetChars(len, buf), but otherwise, poppler and xpdf are still close enough that it was not complicated.
Was there some reason why no one merged in the code before? Are there LZW patent issues?
I'll send a patch tomorrow.
$ ./pdftops tux-yellow.pdf
$ ls -l tux-yellow.ps 
-rw-rw-rw- 1 william william 1126366 Feb  2 22:25 tux-yellow.ps
$ /usr/local/bin/pdftops tux-yellow.pdf 
$ ls -l tux-yellow.ps 
-rw-rw-rw- 1 william william 27552291 Feb  2 22:25 tux-yellow.ps
William

> To: ajohnson at redneon.com; poppler at lists.freedesktop.org
> From: Pierre-Luc.Samuel at ticketmaster.com
> Date: Mon, 1 Feb 2016 16:39:21 -0500
> Subject: Re: [poppler] pdftops creates huge file with simple color background (attached examples)
> 
> On 01/29/2016 05:29 PM, Adrian Johnson wrote:
>  > "pdftocairo -ps tux-yellow.pdf" creates a 112KB file.
>  > "pdftocairo -ps -level2 tux-yellow.pdf" creates a 345KB file.
>  >
>  > So you should be able to get significantly better compression out of 
> pdftops by using the /FlateDecode filter for PS level 3 and fallback to 
> /LZWDecode for level 2.
> 
> Exactly, LZWDecode would be great in pdftops; do you imply there's a way 
> to do that with pdftops?  Using pdftocairo is not possible because of 
> other issues with fonts...
> 
> Also, I noticed https://bugs.freedesktop.org/show_bug.cgi?id=81760 
> mentions that LZW was implemented in xpdf and may be eventually merged 
> back to poppler, any news on that front?
> 
> Pierre-Luc
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