> You state that this approach would lead to
>> useful extensibility.
> I tend to believe that it is nothing but over-engineering.
Well, it will save you or the next person this kind of discussion next time
they want to implement something along that line. For example, you are only
interested in the PostScript backend. Other people might want to try doing
animated SVG and I don't see the point in having them start over.
---
** [issues:#5162] Some hooks useful for video production**
**Status:** New
**Created:** Tue Jul 25, 2017 05:48 PM UTC by Knut Petersen
**Last Updated:** Wed Jul 26, 2017 09:22 AM UTC
**Owner:** Knut Petersen
**Attachments:**
-
[0001-Implement-some-hooks-useful-for-producing-score-vide.patch](https://sourceforge.net/p/testlilyissues/issues/5162/attachment/0001-Implement-some-hooks-useful-for-producing-score-vide.patch)
(7.7 kB; text/x-patch)
Producing ps or pdf documents intended to be used as
a source for video production requires some changes to
the output at a very late stage.
Often a page needs to repeated more than once with only
changes to some kind of progress bar / line or changes
to the color of a few grobs.
Parts of this postprocessing might be passed to postscript,
parts of this postprocessing might be done in the dump-page
procedure.
Therefore this patch provides a hook to write arbitrary
code to the prolog section of postscript output and a
hook to take over the dump-page process.
Using rgb values < 0 and > 1 for grobs is an efficient
way to pass the information that, when and for how long
an object should change its color to a late state of
processing. Therefore a way to disable the range
check implemented in color? and to disable the precision
restriction in setrgbcolor is provided.
---
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