[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5162 Some hoo

You are missing a Rietveld review allowing for commenting on the patch details. At any rate, I think this approach is far too ad-hoc. You'd not get it accepted in the Linux kernel (which you claim to be your metric). I rather propose that you instead allow color to be a list starting with a symbol.

Then you can set
color-function.film.ps = #(lambda (rest of list) ...)
to generate a string in the manner of "setcolor" in scm/output-ps.scm. You can then set your colors as (cons 'film rest of list), if necessary through a callback.

When color-function.film does not exist, a color of (film ...) will lead to an error message at override time. Otherwise, it may lead to an error message at output time (when there is no code for a particular backend).

This leads to useful extensibility, does not mess with the value checks (you'll just add more elements for your film color, depending on the particular application) and complains for a useful subset of undefined situations.

[issues:#5162] Some hooks useful for video production

Status: New
Created: Tue Jul 25, 2017 05:48 PM UTC by Knut Petersen
Last Updated: Tue Jul 25, 2017 05:48 PM UTC
Owner: Knut Petersen
Attachments:

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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From:	Auto mailings of changes to Lily Issues via Testlilyissues-auto
Subject:	[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5162 Some hooks useful for video production
Date:	Tue, 25 Jul 2017 18:26:10 +0000