| | <<<Back 1 day (to 2018/11/05) | 20181106 |
| kens | dmabs (for the logs) -dDuplex has no effect on high level output. | 08:05.59 |
| dmabs | is there any way to accomplish creating a duplex ps file from a pdf? am I thinking about this the wrong way? | 13:46.10 |
| kens2 | As I said in my reply on gs-devel, you can use PSDocOptions and PSPageOptions with the ps2write device | 13:46.39 |
| | Or edit the file after production. | 13:46.48 |
| | In PostScript there is nothing 'special' about a duplex file. All that means is that the program requests the device to duplex the pages. The program itself is unchnged | 13:47.34 |
| NancyDurgin | kens2: Can I ask you a question over here? | 16:02.29 |
| kens2 | Yes sure | 16:02.39 |
| NancyDurgin | What is the "object_num" that is in every object, supposed to be? It is almost always 0, it seems. Is it important? | 16:03.10 |
| kens2 | Its a real number if it was an object read from teh PDF file, otherwise its 0 | 16:03.27 |
| NancyDurgin | I have the refcount thing turned on, and UID seems rational, but object_id doesn't | 16:03.31 |
| kens2 | so if we execute a content stream and put an integer on the stack, that integer will haev an object number of 0 | 16:03.44 |
| NancyDurgin | okay well this file has a ton of objects in it, I am pretty sure. But it is almost always 0 | 16:03.48 |
| kens2 | The majority of objects come from page content streams and will be 0 | 16:04.13 |
| | I fyou think about it, everything in the content stream goes on the stack, which means it has a reference count, but no object number | 16:05.05 |
| NancyDurgin | is it used for anything besides tracking purposes? I mean if it's wrong, is it a problem? | 16:05.26 |
| kens2 | There are comparatively few objects which have numbers, there should be no more than the size of the xref | 16:05.29 |
| NancyDurgin | I don't necessarily think it's wrong, just wondering whether I should be worried | 16:05.37 |
| kens2 | We don't use it much yet, we will need it in future. For example, its one of the thihngs we need to differentiate between mutliple fonts with the same name | 16:05.57 |
| NancyDurgin | okay I think maybe there is just so much going on in this file that the ones with 0 dwarfs the ones without 0's, so maybe it is fine. | 16:06.49 |
| kens2 | Its something the PDF itnerpreter didn't do, and we've had to retrofit it,.which is incomplete and was painful to do (and unreliable) so I wanted it in there right at the start this time | 16:07.00 |
| NancyDurgin | my crash happens at UID 262844 and the debugger takes like 10 minutes to get there :( | 16:07.11 |
| kens2 | Yeah its likely that a real world PDF file is highly complictaed I'm afraid. | 16:07.22 |
| | Normally we reduce files to get to the point of a problem, but that may not bea feasible in this case | 16:07.38 |
| NancyDurgin | I tried reducing and the crash went away. I mean it is probably possible to reduce it, but I am not sure the effort would pay off. | 16:08.03 |
| kens2 | Sadly in this sort of problem, it may not be possible to reduce the file at all | 16:08.23 |
| | We've had cases like that before, and it is painful to work with them | 16:08.37 |
| NancyDurgin | I did extract page 3, which is where the crash happens. But page 3 is super-complex. | 16:08.41 |
| kens2 | Well, its better than havig to do the whoelPDF file I guess | 16:09.01 |
| NancyDurgin | I am pretty sure the crash will have something to do with it being complex, unfortunately | 16:09.05 |
| kens2 | I suspect you are right. I can look at it in a few days, but I'm really keen to get this release out before the sttaff meeting. Otherwise it'll probably fall into the Xmas break | 16:09.48 |
| NancyDurgin | it's fine, I will plug away at it | 16:10.23 |
| | it doesn't appear to be the most obvious thing, that smoebody is decrementing the object ref when they shouldn't be :( | 16:10.54 |
| kens2 | Thanks. If you get really stuck move on, and I'll try to tackle it when I have some time free. I suppose its another possible airplane job | 16:10.55 |
| dmabs | aw, kens2 left before I could thank him | 17:31.27 |
| chrisl | dmabs: You can do so, he'll read the channel logs tomorrow morning (UK time) | 17:37.53 |
| dmabs | ah, by seeing him leave, I assumed he wasnât using a bouncer / no logs | 17:38.41 |
| chrisl | We log this channel at https://ghostscript.com/irclogs/ | 17:39.06 |
| dmabs | ken2: thanks! that was exactly the kind of advice I was looking for | 17:39.14 |
| | and sorry all for double posting the mailing list. being new, I was unsure how active everyone was on irc | 17:40.12 |
| chrisl | dmabs: We try to keep an eye on IRC, but we're not all around all the time | 17:41.31 |
| lorfds | does ghostpdl support pcl macros? | 18:13.39 |
| | also, if anyone has any expertise in pcl macros, let me know...i have some questions | 18:13.52 |
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