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Bug#580447: Regression: LinearShade no longer works

Package: context
Version: 2009.11.26-2
Severity: normal

Hi!

I use ConTeXt to make my presentations. With the latest upgrade, I am
unable to use linear shades, a concept I borrowed from the ConTeXt
Garden Wiki.

Rather than describe the situation, I attach the sample file I use
(test.tex). test.log is the output when I run it with the latest
ConTeXt, while test_old_context.log is the output when run with
Debian ConTeXt 2008.05.21-1 on a Lenny machine.

The expected output is:
http://people.debian.org/~akumar/dump/test_expected.pdf (made with
Debian ConTeXt 2008.05.21-1)

The output I get with the latest ConTeXt is:
http://people.debian.org/~akumar/dump/test_actual.pdf

I think you can spot the problem here; if I comment out the
\setupbackgrounds line, the outputs look identical.

Please let me know if the error is on my side, and if I need to make
some changes at my end. I believe I've done the "read the changelog"
drill, but I am unable to figure out where the error could me.

Thanks for any advice. I'll be glad to give you further inputs if you
want.

Thanks.

Kumar

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.34-rc2 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages context depends on:
ii  dpkg                          1.15.7.1   Debian package management system
ii  lmodern                       2.004.1-3  scalable PostScript and OpenType f
ii  luatex                        0.60.1-1   next generation TeX engine
ii  ruby                          4.5        An interpreter of object-oriented 
ii  tex-common                    2.07       common infrastructure for building
ii  tex-gyre                      2.004.1-2  scalable PostScript and OpenType f
ii  texlive-base                  2009-8     TeX Live: Essential programs and f
ii  texlive-binaries              2009-5     Binaries for TeX Live
ii  texlive-metapost              2009-8     TeX Live: MetaPost (and Metafont) 

Versions of packages context recommends:
ii  ttf-freefont                  20090104-6 Freefont Serif, Sans and Mono True
pn  ttf-gfs-artemisia             <none>     (no description available)
pn  ttf-gfs-baskerville           <none>     (no description available)
pn  ttf-gfs-bodoni-classic        <none>     (no description available)
pn  ttf-gfs-didot                 <none>     (no description available)
pn  ttf-gfs-didot-classic         <none>     (no description available)
pn  ttf-gfs-gazis                 <none>     (no description available)
pn  ttf-gfs-neohellenic           <none>     (no description available)
pn  ttf-gfs-olga                  <none>     (no description available)
pn  ttf-gfs-porson                <none>     (no description available)
pn  ttf-gfs-solomos               <none>     (no description available)
pn  ttf-gfs-theokritos            <none>     (no description available)
pn  ttf-sil-gentium               <none>     (no description available)

Versions of packages context suggests:
ii  context-doc-nonfree         2009.10.27-1 ConTeXt documentation that is not 
ii  context-nonfree             2007.03.22-1 Non-free items from the ConTeXt di
pn  fontforge                   <none>       (no description available)
ii  libxml-parser-perl          2.36-1.1+b1  Perl module for parsing XML files
pn  perl-tk                     <none>       (no description available)

-- no debconf information

-- 
The child ever dwells in the mystery of ageless time,
unobscured by the dust of history.
- Rabindranath Tagore (Fireflies, 1928)

\setuppapersize[S6][S6]
\setuppagenumbering[state=stop]
\switchtobodyfont[modern,20pt]
\setupcolors[state=start]
\setupbackgrounds[page][background=color,backgroundcolor=darkblue]
\startcolor[white]
\setuptolerance[verytolerant,stretch] 
\definecolor[a][r=0,g=0,b=1]
\definecolor[b][r=0,g=0,b=0.05]

\startuniqueMPgraphic{LinearShade}
path p ;
p := unitsquare xscaled \overlaywidth yscaled \overlayheight ;
linear_shade(p,6,\MPcolor{a},\MPcolor{b}) ;
\stopuniqueMPgraphic

\defineoverlay[shaded][\useMPgraphic{LinearShade}]

\setupbackgrounds[page][background={shaded}]
\starttext

Here's my first presentation in \CONTEXT!

Isn't it amazing?

\stoptext

This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian) (format=cont-en 2010.5.5)  5 MAY 2010 23:02
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
 (/usr/share/texmf/web2c/natural.tcx)
**test.tex \emergencyend
(./test.tex

ConTeXt  ver: 2009.11.26 16:28 MKII  fmt: 2010.5.5  int: english/english

system          : cont-new loaded
(/usr/share/texmf/tex/context/base/cont-new.tex
systems         : beware: some patches loaded from cont-new.tex
(/usr/share/texmf/tex/context/base/cont-new.mkii))
system          : cont-fil loaded
(/usr/share/texmf/tex/context/base/cont-fil.tex
loading         : ConTeXt File Synonyms
)
system          : cont-sys.rme loaded
(/etc/texmf/tex/context/user/cont-sys.rme
(/usr/share/texmf/tex/context/base/type-tmf.tex
(/usr/share/texmf/tex/context/base/type-tmf.mkii))
(/usr/share/texmf/tex/context/base/type-siz.tex
(/usr/share/texmf/tex/context/base/type-siz.mkii))
(/usr/share/texmf/tex/context/base/type-one.tex
(/usr/share/texmf/tex/context/base/type-one.mkii)))
system          : test.top loaded
(./test.top)
bodyfont        : 12pt rm is loaded
language        : patterns nl->texnansi:texnansi->1->2:2 nl->ec:ec->2->2:2 us->
ec:ec->3->2:3 de->texnansi:texnansi->4->3:3 de->ec:ec->5->3:3 da->ec:ec->6->2:2
 sv->ec:ec->7->2:2 gb->ec:ec->8->2:2 fr->texnansi:texnansi->9->2:2 fr->ec:ec->1
0->2:2 es->ec:ec->11->2:2 ca->ec:ec->12->2:2 it->texnansi:texnansi->13->2:2 it-
>ec:ec->14->2:2 la->ec:ec->15->2:2 pt->texnansi:texnansi->16->2:2 pt->ec:ec->17
->2:2 ro->ec:ec->18->2:2 pl->pl0:pl0->19->2:2 pl->ec:ec->20->2:2 pl->qx:qx->21-
>2:2 cs->il2:il2->22->2:2 cs->ec:ec->23->2:2 sk->il2:il2->24->2:2 sk->ec:ec->25
->2:2 hr->ec:ec->26->2:2 sl->ec:ec->27->2:2 tr->ec:ec->28->2:2 agr->agr:agr->30
->2:2 fi->ec:ec->31->2:2 hu->ec:ec->32->2:2 ru->t2a:t2a->34->2:2 uk->t2a:t2a->3
5->3:3 loaded
specials        : dvips loaded
\openout3 = `test.tui'.

\openout0 = `test-mpgraph.mp'.

\openout0 = `mpgraph.mp'.

systems         : system commands are enabled
language        : language en is active
specials        : loading definition file tpd
(/usr/share/texmf/tex/context/base/spec-tpd.mkii
specials        : loading definition file fdf
(/usr/share/texmf/tex/context/base/spec-fdf.mkii))
(/usr/share/texmf/tex/context/base/type-pre.tex)
color           : mpcmyk color space is supported
color           : mpspot color space is supported
color           : system rgb is global activated
(./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo)
(./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo)
publications    : file test.bbl not found, waiting for bibtex
(./test.tuo)
systems         : begin file test at line 20
fonts           : resetting map file list
{/usr/share/texmf/fonts/map/pdftex/context/original-empty.map}
fonts           : using map file: original-base
{/usr/share/texmf/fonts/map/pdftex/context/original-base.map}
fonts           : using map file: original-ams-base
{/usr/share/texmf/fonts/map/pdftex/context/original-ams-base.map}
fonts           : using map file: original-public-lm
{/usr/share/texmf/fonts/map/pdftex/context/original-public-lm.map}
fonts           : using map file: lm-ec
{/usr/share/texmf/fonts/map/dvips/lm/lm-ec.map}
fonts           : using map file: lm-math
{/usr/share/texmf/fonts/map/dvips/lm/lm-math.map}
fonts           : using map file: lm-rm
{/usr/share/texmf/fonts/map/dvips/lm/lm-rm.map}
fonts           : using map file: original-ams-euler
{/usr/share/texmf/fonts/map/pdftex/context/original-ams-euler.map}
\openout7 = `test-mpgraph.mp'.

\openout6 = `test-mpgraph.mpb'.

runsystem(mpost  -progname=metafun -mem=metafun test-mpgraph)...disabled (restr
icted).


[MP test-mpgraph.1] (./test.tuo)
(/usr/share/texmf/tex/context/base/sort-def.mkii)
(/usr/share/texmf/tex/context/base/sort-lan.mkii) [1.1]
systems         : end file test at line 26
system          : cont-err loaded
(/usr/share/texmf/tex/context/base/cont-err.tex
systems         : no file 'cont-sys.tex', using 'cont-sys.rme' instead
) ) 
Here is how much of TeX's memory you used:
 1371 strings out of 456423
 19224 string characters out of 536185
 4702368 words of memory out of 7119447
 41869 multiletter control sequences out of 15000+50000
 164788 words of font info for 74 fonts, out of 3000000 for 9000
 396 hyphenation exceptions out of 8191
 51i,18n,77p,254b,973s stack positions out of 5000i,500n,10000p,200000b,50000s
{/usr/share/texmf/fonts/enc/dvips/lm/lm-ec.enc}</usr/share/texmf/fonts/type1
/public/lm/lmr10.pfb>

pdfTeX warning: pdftex: no GlyphToUnicode entry has been inserted yet!
Output written on test.pdf (1 page, 27822 bytes).
PDF statistics:
 15 PDF objects out of 1000 (max. 8388607)
 9 compressed objects within 1 object stream
 0 named destinations out of 1000 (max. 500000)
 7 words of extra memory for PDF output out of 10000 (max. 10000000)


This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6) (format=cont-en 2010.2.10)  5 MAY 2010 22:48
entering extended mode
 %&-line parsing enabled.
 (/usr/share/texmf/web2c/natural.tcx)
**test.tex \emergencyend
(./test.tex

ConTeXt  ver: 2008.05.21 15:21 MKII  fmt: 2010.2.10  int: english/english

language        : language en is active
system          : cont-new loaded
(/usr/share/texmf/tex/context/base/cont-new.tex
systems         : beware: some patches loaded from cont-new.tex
(/usr/share/texmf/tex/context/base/cont-new.mkii)
(/usr/share/texmf/tex/context/base/cont-mtx.tex))
system          : cont-old loaded
(/usr/share/texmf/tex/context/base/cont-old.tex
loading         : Context Old Macros
)
system          : cont-fil loaded
(/usr/share/texmf/tex/context/base/cont-fil.tex
loading         : Context File Synonyms
)
system          : cont-sys.rme loaded
(/etc/texmf/tex/context/user/cont-sys.rme
(/usr/share/texmf/tex/context/base/type-tmf.tex)
(/usr/share/texmf/tex/context/base/type-siz.tex)
(/usr/share/texmf/tex/context/base/type-one.tex)
(/usr/share/texmf/tex/context/base/type-akb.tex))
bodyfont        : 12pt rm is loaded
language        : patterns en->ec:ec->1->2:3 uk->ec:ec->2->2:3 de->texnansi:tex
nansi->3->2:3 de->ec:ec->4->2:3 fr->texnansi:texnansi->5->2:3 fr->ec:ec->6->2:3
 es->ec:ec->7->2:3 pt->texnansi:texnansi->8->2:3 pt->ec:ec->9->2:3 it->texnansi
:texnansi->10->2:3 it->ec:ec->11->2:3 nl->texnansi:texnansi->12->2:3 nl->ec:ec-
>13->2:3 cz->il2:il2->14->2:3 cz->ec:ec->15->2:3 sk->il2:il2->16->2:3 sk->ec:ec
->17->2:3 pl->pl0:pl0->18->2:3 pl->ec:ec->19->2:3 pl->qx:qx->20->2:3 loaded
specials        : tex,postscript,rokicki loaded
\openout3 = `test.tui'.

system          : test.top loaded
(./test.top
specials        : loading definition file tpd
(/usr/share/texmf/tex/context/base/spec-tpd.tex
specials        : loading definition file fdf
(/usr/share/texmf/tex/context/base/spec-fdf.tex
(/usr/share/texmf/tex/context/base/spec-fdf.mkii))
specials        : fdf loaded
)
specials        : fdf,tpd loaded
)
\openout0 = `test-mpgraph.mp'.

\openout0 = `mpgraph.mp'.


systems         : system commands are disabled
(/usr/share/texmf/tex/context/base/type-pre.tex)
color           : mpcmyk color space is supported
color           : mpspot color space is supported
color           : system rgb is global activated
(./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo)
(./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo) (./test.tuo)
(/usr/share/texmf/tex/context/base/pdfr-def.tex)
systems         : begin file test at line 20
fonts           : resetting map file list
{/usr/share/texmf/fonts/map/pdftex/context/original-empty.map}
fonts           : using map file: original-base
{/usr/share/texmf/fonts/map/pdftex/context/original-base.map}
fonts           : using map file: original-ams-base
{/usr/share/texmf/fonts/map/pdftex/context/original-ams-base.map}
fonts           : using map file: original-public-lm
{/usr/share/texmf/fonts/map/pdftex/context/original-public-lm.map}
fonts           : using map file: lm-ec
{/usr/share/texmf/fonts/map/dvips/lm/lm-ec.map}
fonts           : using map file: lm-math
{/usr/share/texmf/fonts/map/dvips/lm/lm-math.map}
fonts           : using map file: lm-rm
{/usr/share/texmf/fonts/map/dvips/lm/lm-rm.map}
fonts           : using map file: 8r-base
{/usr/share/texmf/fonts/map/pdftex/context/8r-base.map}
fonts           : using map file: ec-base
{/usr/share/texmf/fonts/map/pdftex/context/ec-base.map}
fonts           : using map file: t5-base
{/usr/share/texmf/fonts/map/pdftex/context/t5-base.map}
fonts           : using map file: original-ams-euler
{/usr/share/texmf/fonts/map/pdftex/context/original-ams-euler.map}
\openout7 = `test-mpgraph.mp'.

\openout6 = `test-mpgraph.mpb'.

 [MP to PDF]
(./test-mpgraph.4000 (./test.tuo))
(/usr/share/texmf/tex/context/base/sort-def.tex
(/usr/share/texmf/tex/context/base/sort-def.mkii))
(/usr/share/texmf/tex/context/base/sort-lan.tex
loading         : Context Sorting Macros (languages)
(/usr/share/texmf/tex/context/base/sort-lan.mkii)) [1.1]
systems         : end file test at line 26
[flush and process test-mpgraph.mp afterwards]
system          : cont-err loaded
(/usr/share/texmf/tex/context/base/cont-err.tex
systems         : no file 'cont-sys.tex', using 'cont-sys.rme' instead
) ) 
Here is how much of TeX's memory you used:
 1676 strings out of 57603
 24480 string characters out of 553749
 4614192 words of memory out of 5543135
 41248 multiletter control sequences out of 10000+50000
 166046 words of font info for 74 fonts, out of 1200000 for 2000
 192 hyphenation exceptions out of 8191
 52i,20n,77p,257b,1372s stack positions out of 5000i,500n,6000p,200000b,5000s
{/usr/share/texmf/fonts/enc/dvips/lm/lm-ec.enc}</usr/share/texmf/fonts/type1
/public/lm/lmr10.pfb>
Output written on test.pdf (1 page, 27949 bytes).
PDF statistics:
 19 PDF objects out of 1000 (max. 8388607)
 13 compressed objects within 1 object stream
 0 named destinations out of 1000 (max. 131072)
 19 words of extra memory for PDF output out of 10000 (max. 10000000)

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