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From: | Auto mailings of changes to Lily Issues via Testlilyissues-auto |
Subject: | [Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5162 Some hooks useful for video production |
Date: | Wed, 26 Jul 2017 13:51:30 +0000 |
Passing postscript code to other backends indeed is a good idea ;-)
So you agree that a hook mechanism discriminating between backends is a good idea. That's why I proposed it.
[issues:#5162] Some hooks useful for video production
Status: Started
Created: Tue Jul 25, 2017 05:48 PM UTC by Knut Petersen
Last Updated: Wed Jul 26, 2017 11:51 AM UTC
Owner: Knut Petersen
Attachments:
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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