On Mon, May 19, 2025 at 11:39:32PM +0200, Enrico Forestieri wrote:
On Mon, May 19, 2025 at 02:44:06PM +0200, Jean-Marc Lasgouttes wrote:
Dear all,
With UserGuide, I get a lot of output concerning previews:
Warning: dvipng failed to generate images from
lyxpreviewSZhsFp.dvi... fallback to legacy method
Warning: epstopdf failed on page 1, file lyxpreviewSZhsFp.001
Warning: epstopdf failed on page 2, file lyxpreviewSZhsFp.002
[...]
Warning: epstopdf failed on page 108, file lyxpreviewSZhsFp.108
Warning: epstopdf failed on page 109, file lyxpreviewSZhsFp.109
Warning: Now trying to obtain failed previews through pdflatex
How do I debug this? The only thin I manage to do it to run dvipng
on lyxpreviewSZhsFp.dvi, and see that it ends with:
dvipng: Fatal error, out of color stack space
Any idea? I understand I may be missing some program, but which one?
Is it any better after 1888d50e?
I had a closer look at this issue. The only problem occurring on Windows
has been solved by 1888d50e. However, I tried on linux and I get the
same results as yours. The only difference is the dvipng version, which
is 1.16 in Windows and 1.15 in Debian.
It turns out that version 1.15 errors out when some postscript specials
are present and lyxpreview2bitmap.py aborts everything and tries the
legacy route. Instead, version 1.16 does not error out and our script is
prepared to deal with the failing previews by only trying on them the
legacy route.
So, this is a dvipng issue, confirmed by the fact that I tried version
1.18 from Debian/testing and it works fine.
I don't know what to do. On the one hand the attached patch solves the
issue for me with version 1.15, but I don't have any info on the return
codes from dvipng and it very possible that that return code (136) is
not specific to postscript specials issues. On the other end, the
problem will disappear by upgrading dvipng.
--
Enrico
diff --git a/lib/scripts/lyxpreview2bitmap.py b/lib/scripts/lyxpreview2bitmap.py
index 56314356d1..dade8745bb 100755
--- a/lib/scripts/lyxpreview2bitmap.py
+++ b/lib/scripts/lyxpreview2bitmap.py
@@ -513,7 +513,7 @@ def main(argv):
% (dvipng, resolution, fg_color_dvipng, bg_color_dvipng,
pages_parameter, dvi_file)
dvipng_status, dvipng_stdout = run_command(dvipng_call)
- if dvipng_status:
+ if dvipng_status and int(dvipng_status) != 136:
warning("%s failed to generate images from %s... fallback to legacy
method" \
% (os.path.basename(dvipng), dvi_file))
progress("Using the legacy conversion method (dvipng failed)")
--
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