Re: Minimum GS version

[Luca Fascione]

Brilliant.
Now that I got EPSCrop going, I am able to make my own rasters using mupdf,
and it's working well.

eps -> pdf takes ~ 70ms
pdf -> numpy array ~ 5ms (a 300dpi raster of 221x1884 pxl, I have run this
with 8x8 aa and aa disabled and I got the same speed)

SIFT feature detection -> 500ms
ORB feature detector -> 250ms
corner feature detector -> 80ms

I suspect I can stand up gs once and make a giant pdf with one cropped page
per input EPS, which is likely to improve the overall efficiency
of the initial rasterization process a fair bit,
but until I figure out whether this feature-based comparison concept even
has merit, all that is secondary.

One way or the other now I'm in a place where I can actually work :-)

L

On Sun, Sep 29, 2024 at 11:13 AM Han-Wen Nienhuys <hanwenn@gmail.com> wrote:

> On Sun, Sep 29, 2024 at 9:32 AM Luca Fascione <l.fascione@gmail.com>
> wrote:
> >
> > I'm using the same options that gv uses, nosafer and all, and gv
> displays the file just fine. I've not fiddled with it enough to make gs
> DRIVER=display work, because WSL2 and that driver don't seem to be on good
> terms. But I'll spend some time on that today.
> > Because I'm still experimenting with things, I'd rather have under
> control how to go from a vector representation to a raster (I'dlike to
> investigatethe effects of resolution and AA settings, for example), can I
> use Cairo in pdf mode?
>
> You can use Cairo if you add
>
>   LOCAL_LILYPOND_FLAGS=-dbackend=cairo
>
> local.make, and apply the following
> commit e48daf754a323eca0c5b15f8677d4c9574c98ad4 (HEAD -> top)
> Author: Han-Wen Nienhuys <hanwenn@gmail.com>
> Date:   Sun Sep 29 10:56:46 2024 +0200
>
>     pdf
>
> diff --git a/make/lysdoc-targets.make b/make/lysdoc-targets.make
> index 453b449575..f425c9de32 100644
> --- a/make/lysdoc-targets.make
> +++ b/make/lysdoc-targets.make
> @@ -19,7 +19,7 @@ lysdoc-test:
>  #       Removing it works around incomplete dependencies.
>         rm -f $(outdir)/collated-files.texi
>         time $(MAKE) LILYPOND_BOOK_LILYPOND_FLAGS=" \
> --dseparate-page-formats=ps $(LILYPOND_JOBS) -dseparate-log-files \
> +-dseparate-page-formats=ps,pdf,png $(LILYPOND_JOBS) -dseparate-log-files \
>  -ddeterministic \
>  -dinclude-eps-fonts -dgs-load-fonts --header=texidoc \
>  -dcheck-internal-types \
> @@ -27,7 +27,7 @@ lysdoc-test:
>  $(LOCAL_LILYPOND_FLAGS)" \
>                 LILYPOND_BOOK_WARN= \
>                 LYS_OUTPUT_DIR=$(top-build-dir)/out/lybook-testdb \
> -               $(outdir)/collated-files.html
> +               $(outdir)/collated-files.pdf
>  #       Later testing will find fonts via this link.
>         ( cd $(outdir) && \
>           rm -rf share && \
>
>
> > On Sun, 29 Sept 2024, 09:26 Han-Wen Nienhuys, <hanwenn@gmail.com> wrote:
> >>
> >> The EPS files have some tricks to keep sizes small (load font files
> >> directly from the FS), which requires -dNOSAFER, and makes them more
> >> fiddly.
> >>
> >> If you are trying to get up to speed with regression testing, you
> >> could try running the whole thing (baseline and test) with
> >> -dbackend=cairo which produces PNG files directly.
> >>
> >> On Sun, Sep 29, 2024 at 12:08 AM Luca Fascione <l.fascione@gmail.com>
> wrote:
> >> >
> >> > Hi,
> >> > I'm trying to convert this file
> >> >
> $build/input/regression/out-test/tuplet-number-shift-along-kneed-beam.eps
> >> > to pdf
> >> > using epstopdf.
> >> > This doesn't fail, and in fact gv shows the contents (using
> -dNOSAFER).
> >> > But the pdf produced seems to be an empty file.
> >> > Or rather has some data in it, but gv displays the message
> >> >
> >> > Warning: Missing charsets in String to FontSet conversion
> >> >
> >> > And all pixels render white.
> >> >
> >> > I'm using GhostScript 9.55 and just remembered something about a
> minimum
> >> > version of GS being needed for lilypond EPS files.
> >> >
> >> > FWIW, if I read it correctly, epstopdf ends up doing just about this:
> >> > cat
> >> >
> /home/lukes/src/lilypond-build/input/regression/out-test/tuplet-number-shift-along-kneed-beam.eps
> >> > | gs -dNOSAFER -dNOPAUSE -dBATCH -dCompatibilityLevel=1.5
> -sDEVICE=pdfwrite
> >> >
> -sOutputFile=/tmp/lukes/lilypond/input/regression/out-test/tuplet-number-shift-along-kneed-beam.pdf
> >> > -dPDFSETTINGS#/prepress -dMaxSubsetPct=100 -dEmbedAllFonts=true
> >> > -dAutoRotatePages#/None -dDEBUG - -c quit
> >> >
> >> > Which I also tried on cmdline with the same result.
> >> >
> >> > I see on this page
> >> >
> >> >
> https://lilypond.org/doc/v2.25/Documentation/contributor/requirements-for-running-lilypond
> >> >
> >> > that minimum GS is 9.03, though.
> >> >
> >> > Any clues?
> >> > Cheers
> >> > Luca
> >> >
> >> > --
> >> > Luca Fascione
> >>
> >>
> >>
> >> --
> >> Han-Wen Nienhuys - hanwenn@gmail.com - http://www.xs4all.nl/~hanwen
>
>
>
> --
> Han-Wen Nienhuys - hanwenn@gmail.com - http://www.xs4all.nl/~hanwen
>


-- 
Luca Fascione