Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Wolfgang Schuster schuster.wolfg...@gmail.com writes: math-stc.mkvi: % - \ifx\currentmathtext\empty + \ifx\m_math_stackers_text_middle\empty \setbox\scratchboxthree\emptyhbox Is this change still also needed (in addition to the luatex fix)? -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Sanjoy Mahajan san...@mit.edu writes: I've been finding many unexplained 0.5pt or so differences, which may be related to the underbrace problem. ... What I keep finding is that pages long after where I make a small change somehow get changed, with roughly one-pixel shifts to parts of the page. These small shifts were also caused by the underbrace luatex bug (these pages all had underbraces on them)---many birds with one stone. -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
luigi scarso luigi.sca...@gmail.com writes: Under linux you can also try diffpdf Thanks -- I'd forgotten about that and just tried it. If you are looking for pixel-level changes, my script makes it easier to see exactly what the changes are. On the other hand, diffpdf is more polished than my script. -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Hans Hagen pra...@wxs.nl writes: After a day of testing, tracing, wondering etc Luigi and I figured out what was the problem it tooks us lots of debug prints -). Indeed there is a bug in luatex. Great detective work! So, some random value (not entirely random as it depends on what mem area the glue node is allocated from and that is kind of stable in a run) was added which results in the effects you noticed. Ah, so running it 3 times would allocate the glue node from higher and higher mem, and thereby making the not-so-random value larger and larger. So, once this fix moves upstream you can check your suspicious cases. Luigi will push it in our experimental branch and I suppose that Taco will then push it into trunk and after that you can compile Once it in the luatex trunk, I will check it right away. I am also happy to test the experimental branch if you give me a pointer to it. or wait till the garden carries it. Do you mean in the minimals? Thanks for noticing! For sure. I am very happy that it is fixed, and fixed before I have to give in my absolute final PDF file. My only worry is that the carefully tuned page breaks, some of which are sensitive to 1pt insertions of vertical space, might change once the underbraces return to their homes. But I'll tweak it with a bit of vertical space. -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Once it in the luatex trunk, I will check it right away. I just compiled and installed luatex 0.79.1 r5033, remade the formats, and the result passes my underbrace tests (the 30,000 iterations and the examples in my book mss). Thank you for the great debugging. -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
On 7/4/2014 9:12 AM, Akira Kakuto wrote: It does also depend on the width of the text because when I use 48pt in the example below the height of the brace is always the same but with 49pt the height increases after the first page. An experiment: width = 48.0719985pt height = 4.968pt (constant) width = 48.0719986pt height = unpredictable various values So now we need to figure out where it comes from; maybe some math parameter get messed up ... it has to do with the mechanism that builds extensibles from snippets (begin - connector - middle - connector - end glyphs). Depending on the width this goes in steps: first fixed prebuild glyphs, later extensibles. Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
On 7/4/2014 6:58 AM, Wolfgang Schuster wrote:
Am 04.07.2014 um 00:51 schrieb Hans Hagen pra...@wxs.nl
mailto:pra...@wxs.nl:
On 7/4/2014 12:37 AM, Sanjoy Mahajan wrote:
context --make does a --generate so you can skip that and the luatools
run is not needed either (selfupdate is seldom needed too)
So 'context --make' is all one needs? I'll update the wiki.
we get a ..5pt height difference somewhere (nothing else different in a
trace) smells like a luatex bug (testing that now)
That is my suspicion as well. But I couldn't reproduce it with plain
luatex. Though maybe I needed to use equation numbers, however that is
done in plain tex (the context run doesn't show the problem without the
\placeformula).
I suspect some internal state is getting slightly corrupted and getting
progressively worse with the 30,000 repetitions.
here it happens after a pagebreak (a few lines overflow are ok)
It does also depend on the width of the text because when I use 48pt in
the example below
the height of the brace is always the same but with 49pt the height
increases after the first page.
\starttext
\dorecurse{100}
{\startformula
\mathord
{%\setbox\scratchbox\mathstylehbox{\Umathaccent\fam\zerocountFE3DF{\hskip48pt}}%
\setbox\scratchbox\mathstylehbox{\Umathaccent\fam\zerocountFE3DF{\hskip49pt}}%
\the\userpageno:\the\ht\scratchbox}%
\stopformula}
\stoptext
\starttext
\dorecurse{1000}
{\setbox\scratchbox\hbox{$\Umathaccent\fam\zerocountFE3DF{\hskip49pt}$}%
\the\ht\scratchbox\par}
\stoptext
that was the one i used when seeing some trigger from the page break
(the two at the top of page 2 are the overshoot before tex triggers the
page)
Hans
-
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Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Wolfgang Schuster schuster.wolfg...@gmail.com writes:
It does also depend on the width of the text because when I use 48pt
in the example below the height of the brace is always the same but
with 49pt the height increases after the first page.
An interesting bug. That's also consistent with my experiments, in which
\underbrace{\hbox{ }}_{\rho}
triggers the problem, but
\underbrace{\hbox{}}_{\rho}
does not.
-Sanjoy
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
On 7/4/2014 11:34 AM, Sanjoy Mahajan wrote:
Wolfgang Schuster schuster.wolfg...@gmail.com writes:
It does also depend on the width of the text because when I use 48pt
in the example below the height of the brace is always the same but
with 49pt the height increases after the first page.
An interesting bug. That's also consistent with my experiments, in which
\underbrace{\hbox{ }}_{\rho}
triggers the problem, but
\underbrace{\hbox{}}_{\rho}
does not.
Hi Sanjoy,
After a day of testing, tracing, wondering etc Luigi and I figured out
what was the problem it tooks us lots of debug prints -). Indeed there
is a bug in luatex. An extensible is made up of a sequence
char
skip 0pt- xpt
char
skip 0pt- xpt
char
skip 0pt- xpt
char
And the code that determines the height/depth took the dimensions of
skips into the equation while in fact glue has no such dimensions
(leaders that are a special kind of glue have dimensions). Not the first
place one looks for such an issue. Probably a side effect of copying a
function and patching part.
So, some random value (not entirely random as it depends on what mem
area the glue node is allocated from and that is kind of stable in a
run) was added which results in the effects you noticed.
Because it is stable within a run (same successive errors) it doesn't
result in oscillating (too many runs due to differences in results) and
this is probably why it went unnoticed so long. Interesting. (Normally
the pseudo random ht/dp were small.)
So, once this fix moves upstream you can check your suspicious cases.
Luigi will push it in our experimental branch and I suppose that Taco
will then push it into trunk and after that you can compile or wait till
the garden carries it.
Thanks for noticing!
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
I thought the problem might lie with the general \definemathunderextensible (math-stc.mkvi), because underbrace is defined as \definemathunderextensible [vfenced] [underbrace][FE3DF] % [023DF] Other underextensibles include \underbar: \definemathunderextensible [vfenced] [underbar] [FE33F] % [203E] So I tried my example replacing \underbrace with \underbar but the alignment comes out fine (and \overbrace works fine too). So that debugging idea didn't work, except to indicate that something special about underbrace isn't working right. Does anyone have suggestions for further debugging ideas? -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Am 03.07.2014 um 12:49 schrieb Sanjoy Mahajan san...@mit.edu:
I thought the problem might lie with the general
\definemathunderextensible (math-stc.mkvi), because underbrace is
defined as
\definemathunderextensible [vfenced] [underbrace][FE3DF] %
[023DF]
Other underextensibles include \underbar:
\definemathunderextensible [vfenced] [underbar] [FE33F]
% [203E]
So I tried my example replacing \underbrace with \underbar but the
alignment comes out fine (and \overbrace works fine too). So that
debugging idea didn't work, except to indicate that something special
about underbrace isn't working right.
Does anyone have suggestions for further debugging ideas?
math-stc.mkvi:
\unexpanded\def\math_stackers_make_double#top#bottom#category#codepoint#codeextra#text%
{\begingroup
\edef\currentmathstackers{#category}%
\mathstackersparameter\c!left\relax
\ifmmode\math_class_by_parameter\mathstackersparameter\else\dontleavehmode\fi
{\edef\currentmathstackers{#category}%
\edef\m_math_stackers_text_middle {#text}%
%
...
%
- \ifx\currentmathtext\empty
+ \ifx\m_math_stackers_text_middle\empty
\setbox\scratchboxthree\emptyhbox
\else
\setmathtextbox\scratchboxthree\hbox{\math_stackers_middletext}%
\fi
...
\fi}%
\mathstackersparameter\c!right\relax
\edef\p_limits{\mathstackersparameter\c!mathlimits}%
\ifx\p_limits\v!yes
\expandafter\endgroup\expandafter\limits
\else
\expandafter\endgroup
\fi}
Wolfgang
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
math-stc.mkvi: \unexpanded\def\math_stackers_make_double#top#bottom#category#codepoint#codeextra#text% ... - \ifx\currentmathtext\empty + \ifx\m_math_stackers_text_middle\empty \setbox\scratchboxthree\emptyhbox \else Thanks for looking into this, Wolfgang. I made this change to math-stc.mkvi in the 2014.05.17 beta, then remade the MkIV format with mtxrun --selfupdate mtxrun --generate luatools --generate context --make Then I ran context on my test file (with 3 as the \dorecurse count). However, the offset underbraces remain. I'm attaching a image from p. 2128, by which point the offset is 20 or 30pt. I am fairly sure I am running the newly created version, because remaking the format included these lines: open source 1 256 /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/math-stc.mkvi loading ConTeXt Math Macros / Stackers close source 1 256 /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/math-stc.mkvi and the log output from running the minimal.tex shows that the the fmt is indeed dated 2014.7.3: mtx-context | run 1: luatex --fmt=/home/sanjoy/context/2014.05.17-beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en --jobname=minimal --lua=/home/sanjoy/context/2014.05.17-beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui --no-parse-first-line --c:currentrun=1 --c:fulljobname=./minimal.tex --c:input=./minimal.tex --c:kindofrun=1 --c:maxnofruns=8 cont-yes.mkiv This is LuaTeX, Version beta-0.79.1 (TeX Live 2014/dev) (rev 4972) \write18 enabled. open source 1 1 /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/cont-yes.mkiv ConTeXt ver: 2014.05.17 23:46 MKIV beta fmt: 2014.7.3 int: english/english -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
On 7/3/2014 11:03 PM, Sanjoy Mahajan wrote: math-stc.mkvi: \unexpanded\def\math_stackers_make_double#top#bottom#category#codepoint#codeextra#text% ... - \ifx\currentmathtext\empty + \ifx\m_math_stackers_text_middle\empty \setbox\scratchboxthree\emptyhbox \else Thanks for looking into this, Wolfgang. I made this change to math-stc.mkvi in the 2014.05.17 beta, then remade the MkIV format with mtxrun --selfupdate mtxrun --generate luatools --generate context --make context --make does a --generate so you can skip that and the luatools run is not needed either (selfupdate is seldom needed too) Then I ran context on my test file (with 3 as the \dorecurse count). However, the offset underbraces remain. I'm attaching a image from p. 2128, by which point the offset is 20 or 30pt. I am fairly sure I am running the newly created version, because remaking the format included these lines: open source 1 256 /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/math-stc.mkvi loading ConTeXt Math Macros / Stackers close source 1 256 /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/math-stc.mkvi and the log output from running the minimal.tex shows that the the fmt is indeed dated 2014.7.3: mtx-context | run 1: luatex --fmt=/home/sanjoy/context/2014.05.17-beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en --jobname=minimal --lua=/home/sanjoy/context/2014.05.17-beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui --no-parse-first-line --c:currentrun=1 --c:fulljobname=./minimal.tex --c:input=./minimal.tex --c:kindofrun=1 --c:maxnofruns=8 cont-yes.mkiv This is LuaTeX, Version beta-0.79.1 (TeX Live 2014/dev) (rev 4972) \write18 enabled. open source 1 1 /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/cont-yes.mkiv ConTeXt ver: 2014.05.17 23:46 MKIV beta fmt: 2014.7.3 int: english/english we get a .5pt height difference somewhere (nothing else different in a trace) ... smells like a luatex bug (testing that now) Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
context --make does a --generate so you can skip that and the luatools
run is not needed either (selfupdate is seldom needed too)
So 'context --make' is all one needs? I'll update the wiki.
we get a .5pt height difference somewhere (nothing else different in a
trace) ... smells like a luatex bug (testing that now)
That is my suspicion as well. But I couldn't reproduce it with plain
luatex. Though maybe I needed to use equation numbers, however that is
done in plain tex (the context run doesn't show the problem without the
\placeformula).
I suspect some internal state is getting slightly corrupted and getting
progressively worse with the 30,000 repetitions.
I've been finding many unexplained 0.5pt or so differences, which may be
related to the underbrace problem. The context, so to speak, is that I
am putting in the last edits to the book, after having gone through and
checked every page many times. So I want to ensure that none of the
small changes has a big effect, but I don't want to check every page
again (or I'll vomit).
Thus, I run my compare-pdfs.sh script on the previous and the latest
pdf. It renders each page to a B/W png (using mupdf) and then compares
corresponding pages using 'compare' (one of the ImageMagick tools). Any
differing pixels are in red, and the shared pixels are in very light
gray. Then all the pages with enough differences are viewed with 'feh',
in order of most-to-least differences. And I check that nothing major
has changed.
What I keep finding is that pages long after where I make a small change
somehow get changed, with roughly one-pixel shifts to parts of the page.
I'm attaching an example pixel diff. It shows changes on p.72 of the
mss. However, the only change to the source code was on p.58 (and was
designed not to change any page breaks, which it didn't). That same
page (p.72) often gets similar changes with all kinds of small changes.
[Note to me: In case I need to recreate the source for debugging
purposes, it's the change from rev 41ff54 to 2467d5]
In case the script is useful to others (earlier versions are in the
contexttest repository somewhere), I am attaching it. I use it as
follows with a bash command line. (The awk in the pipeline makes sure
that only pages with some difference make it to the viewer.)
DPI=72 compare-pdfs.sh old.pdf new.pdf | tee book-print.compare72dpi | awk '{if
(($3 0.02)) print;}' | sort -nr -k3 | awk '{print $1}' | xargs -r feh
-Sanjoy
#! /bin/bash
# Usage: $0 file1.pdf file2.pdf
#
# compares file1.pdf and file2.pdf by rendering each page and using
# the 'compare' ImageMagick utility
#
# Copyright 2007-2014 Sanjoy Mahajan. Licensed under the GNU GPL version 3
# or (at your option) any later version.
#
# HISTORY
# 2014-06-22: Use mudraw instead of pdftoppm. GPL v3+
# 2009-09-30: Fix capture of dB output; don't use a viewer; use pdftoppm
# 2007-01-15: First version
#
if [ -z $DPI ]; then
DPI=72
fi
ext=png
if [ -z $1 -o -z $2 ]; then
echo Usage: $0 file1.pdf file2.pdf
exit 3
fi
# generate the many page images in a temporary directory
d=`mktemp -d`
mkdir -p $d/a $d/b
mudraw -r $DPI -g -o $d/a/%03d.$ext $1
mudraw -r $DPI -g -o $d/b/%03d.$ext $2
wait
# find the union of the page numbers (in case one pdf has more pages)
pages=`ls $d/{a,b}/*.$ext | sed s%.*/\([0-9][0-9]*\).$ext%\1% | sort -un`
# compare each page
for p in $pages ; do
if ! [ -e $d/a/$p.$ext ] ; then
echo $p: missing from $1
continue
fi
if ! [ -e $d/b/$p.$ext ] ; then
echo $p: missing from $2
continue
fi
echo -n $d/diff-$p.$ext $p
compare -metric mae $d/{a,b}/$p.$ext $d/diff-$p.$ext 21
done
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
On Fri, Jul 4, 2014 at 12:37 AM, Sanjoy Mahajan san...@mit.edu wrote:
context --make does a --generate so you can skip that and the luatools
run is not needed either (selfupdate is seldom needed too)
So 'context --make' is all one needs? I'll update the wiki.
we get a .5pt height difference somewhere (nothing else different in a
trace) ... smells like a luatex bug (testing that now)
That is my suspicion as well. But I couldn't reproduce it with plain
luatex. Though maybe I needed to use equation numbers, however that is
done in plain tex (the context run doesn't show the problem without the
\placeformula).
I suspect some internal state is getting slightly corrupted and getting
progressively worse with the 30,000 repetitions.
I've been finding many unexplained 0.5pt or so differences, which may be
related to the underbrace problem. The context, so to speak, is that I
am putting in the last edits to the book, after having gone through and
checked every page many times. So I want to ensure that none of the
small changes has a big effect, but I don't want to check every page
again (or I'll vomit).
Thus, I run my compare-pdfs.sh script on the previous and the latest
pdf. It renders each page to a B/W png (using mupdf) and then compares
corresponding pages using 'compare' (one of the ImageMagick tools). Any
differing pixels are in red, and the shared pixels are in very light
gray. Then all the pages with enough differences are viewed with 'feh',
in order of most-to-least differences. And I check that nothing major
has changed.
What I keep finding is that pages long after where I make a small change
somehow get changed, with roughly one-pixel shifts to parts of the page.
I'm attaching an example pixel diff. It shows changes on p.72 of the
mss. However, the only change to the source code was on p.58 (and was
designed not to change any page breaks, which it didn't). That same
page (p.72) often gets similar changes with all kinds of small changes.
[Note to me: In case I need to recreate the source for debugging
purposes, it's the change from rev 41ff54 to 2467d5]
In case the script is useful to others (earlier versions are in the
contexttest repository somewhere), I am attaching it. I use it as
follows with a bash command line. (The awk in the pipeline makes sure
that only pages with some difference make it to the viewer.)
DPI=72 compare-pdfs.sh old.pdf new.pdf | tee book-print.compare72dpi | awk
'{if (($3 0.02)) print;}' | sort -nr -k3 | awk '{print $1}' | xargs -r feh
Thank you for the script.
Under linux you can also try diffpdf
$ aptitude search diffpdf
i diffpdf
- compare two PDF
files textually or visually
p diffpdf:i386
- compare two PDF
files textually or visually
--
luigi
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wiki : http://contextgarden.net
___
Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
On 7/4/2014 12:37 AM, Sanjoy Mahajan wrote:
context --make does a --generate so you can skip that and the luatools
run is not needed either (selfupdate is seldom needed too)
So 'context --make' is all one needs? I'll update the wiki.
we get a .5pt height difference somewhere (nothing else different in a
trace) ... smells like a luatex bug (testing that now)
That is my suspicion as well. But I couldn't reproduce it with plain
luatex. Though maybe I needed to use equation numbers, however that is
done in plain tex (the context run doesn't show the problem without the
\placeformula).
I suspect some internal state is getting slightly corrupted and getting
progressively worse with the 30,000 repetitions.
here it happens after a pagebreak (a few lines overflow are ok)
I've been finding many unexplained 0.5pt or so differences, which may be
related to the underbrace problem. The context, so to speak, is that I
am putting in the last edits to the book, after having gone through and
checked every page many times. So I want to ensure that none of the
small changes has a big effect, but I don't want to check every page
again (or I'll vomit).
Thus, I run my compare-pdfs.sh script on the previous and the latest
pdf. It renders each page to a B/W png (using mupdf) and then compares
corresponding pages using 'compare' (one of the ImageMagick tools). Any
differing pixels are in red, and the shared pixels are in very light
gray. Then all the pages with enough differences are viewed with 'feh',
in order of most-to-least differences. And I check that nothing major
has changed.
What I keep finding is that pages long after where I make a small change
somehow get changed, with roughly one-pixel shifts to parts of the page.
I'm attaching an example pixel diff. It shows changes on p.72 of the
mss. However, the only change to the source code was on p.58 (and was
designed not to change any page breaks, which it didn't). That same
page (p.72) often gets similar changes with all kinds of small changes.
[Note to me: In case I need to recreate the source for debugging
purposes, it's the change from rev 41ff54 to 2467d5]
In case the script is useful to others (earlier versions are in the
contexttest repository somewhere), I am attaching it. I use it as
follows with a bash command line. (The awk in the pipeline makes sure
that only pages with some difference make it to the viewer.)
DPI=72 compare-pdfs.sh old.pdf new.pdf | tee book-print.compare72dpi | awk '{if
(($3 0.02)) print;}' | sort -nr -k3 | awk '{print $1}' | xargs -r feh
-Sanjoy
--
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Am 04.07.2014 um 00:51 schrieb Hans Hagen pra...@wxs.nl:
On 7/4/2014 12:37 AM, Sanjoy Mahajan wrote:
context --make does a --generate so you can skip that and the luatools
run is not needed either (selfupdate is seldom needed too)
So 'context --make' is all one needs? I'll update the wiki.
we get a .5pt height difference somewhere (nothing else different in a
trace) ... smells like a luatex bug (testing that now)
That is my suspicion as well. But I couldn't reproduce it with plain
luatex. Though maybe I needed to use equation numbers, however that is
done in plain tex (the context run doesn't show the problem without the
\placeformula).
I suspect some internal state is getting slightly corrupted and getting
progressively worse with the 30,000 repetitions.
here it happens after a pagebreak (a few lines overflow are ok)
It does also depend on the width of the text because when I use 48pt in the
example below
the height of the brace is always the same but with 49pt the height increases
after the first page.
\starttext
\dorecurse{100}
{\startformula
\mathord
{%\setbox\scratchbox\mathstylehbox{\Umathaccent\fam\zerocountFE3DF{\hskip48pt}}%
\setbox\scratchbox\mathstylehbox{\Umathaccent\fam\zerocountFE3DF{\hskip49pt}}%
\the\userpageno:\the\ht\scratchbox}%
\stopformula}
\stoptext
Wolfgang___
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Re: [NTG-context] underbraces get progressively more misaligned (w/ minimal example)
Here is a 72dpi rendering of the last page (with recursion count=3). -Sanjoy ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
