overprint bug (mkiv)

overprint bug (mkiv)

[Peter Rolf]

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Hi Hans,

overprinting is broken under very special conditions. You need to add 
framed content with a defined mp overlay as background and *deactivated 
frame* to a layer (last of the four pairs in the example). The text of 
the last pair is written in the same \GSoverprint group (in this case 
the \GSknockout is even missing). Very obscure.

Have fun,

Peter


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\setupcolors[state=start]
\setuppagenumber[state=stop]

\pdfcompresslevel=0
\pdfobjcompresslevel=0

\startuniqueMPgraphic{FOO}
    fill OverlayBox withcolor lightgray;
\stopuniqueMPgraphic

\defineoverlay[FOO][\uniqueMPgraphic{FOO}]
\definelayer[BAR]



\starttext

% OK
\setlayer[BAR][x=0mm,y=0mm]
{\framed[background=color,backgroundcolor=lightgray,frame=off]
{\startoverprint first one\stopoverprint}}
\setlayer[BAR][x=50mm,y=0mm]
{\framed[background=color,backgroundcolor=lightgray,frame=off]
{\startoverprint second one\stopoverprint}}

% OK
\setlayer[BAR][x=0mm,y=15mm]
{\framed[background=color,backgroundcolor=lightgray,frame=on]
{\startoverprint first one\stopoverprint}}
\setlayer[BAR][x=50mm,y=15mm]
{\framed[background=color,backgroundcolor=lightgray,frame=on]
{\startoverprint second one\stopoverprint}}

% OK
\setlayer[BAR][x=0mm,y=30mm]
{\framed[background=FOO,frame=on]
{\startoverprint first one\stopoverprint}}
\setlayer[BAR][x=50mm,y=30mm]
{\framed[background=FOO,frame=on]
{\startoverprint second one\stopoverprint}}

% ( layer + overlay + frame=off ) is buggy
\setlayer[BAR][x=0mm,y=45mm]
{\framed[background=FOO,frame=off]
{\startoverprint first one\stopoverprint}}
\setlayer[BAR][x=50mm,y=45mm]
{\framed[background=FOO,frame=off]
{\startoverprint second one\stopoverprint}}


\flushlayer[BAR]

\stoptext

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Re: overprint bug (mkiv)

[Hans Hagen]

Peter Rolf wrote:

> overprinting is broken under very special conditions. You need to add 
> framed content with a defined mp overlay as background and *deactivated 
> frame* to a layer (last of the four pairs in the example). The text of 
> the last pair is written in the same \GSoverprint group (in this case 
> the \GSknockout is even missing). Very obscure.


\def\reuseMPbox#1#2#3#4#5% space delimiting would save some tokens
   {\xdef\MPllx{#2}%        but it's not worth the effort and looks
    \xdef\MPlly{#3}%        ugly as well
    \xdef\MPurx{#4}%
    \xdef\MPury{#5}%
    \forcecolorhack\getobject{MP}{#1}} % else no proper color intent

the issue is as follows:

- i use attributes for such things
- and, in the backend i only look at glyph and rule nodes
- however, the reused graphic is an object
- so, i have a \forcecolorhack
- this tells the backend to treat the following node as well

there are a few more places where this is needed and in due time it will 
be sorted out

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: overprint bug (mkiv)

[Peter Rolf]

Hans Hagen schrieb:
> Peter Rolf wrote:
>
>> overprinting is broken under very special conditions. You need to add 
>> framed content with a defined mp overlay as background and 
>> *deactivated frame* to a layer (last of the four pairs in the 
>> example). The text of the last pair is written in the same 
>> \GSoverprint group (in this case the \GSknockout is even missing). 
>> Very obscure.
>
>
> \def\reuseMPbox#1#2#3#4#5% space delimiting would save some tokens
>   {\xdef\MPllx{#2}%        but it's not worth the effort and looks
>    \xdef\MPlly{#3}%        ugly as well
>    \xdef\MPurx{#4}%
>    \xdef\MPury{#5}%
>    \forcecolorhack\getobject{MP}{#1}} % else no proper color intent
>
> the issue is as follows:
>
> - i use attributes for such things
> - and, in the backend i only look at glyph and rule nodes
> - however, the reused graphic is an object
> - so, i have a \forcecolorhack
> - this tells the backend to treat the following node as well
>
Thank you Hans (also for the nice explanation)! The minimal example 
works here, also the first test graphic. Nevertheless there is still a 
bug in the definition of \forcecolorhack. The error message of my second 
test graphic is the same as in

http://archive.contextgarden.net/message/20090901.094156.1dc47c81.en.html

So you should be able to produce the error with that example. The last 
time I simply used the old (commented) definition and everything worked 
again. I even looked at the definition of leaders that time (last used 
in LaTeX around eight years ago) and I think \zeropoint is no valid glue 
value here.

> there are a few more places where this is needed and in due time it 
> will be sorted out
>
I don't know if I should laugh or cry here. It took me nearly two days 
to make that minimal example. I'll interpret your last sentence as black 
humour... :)

Best wishes,  Peter

> Hans
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | fax: 038 477 53 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  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>

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___________________________________________________________________________________

Re: overprint bug (mkiv)

[Hans Hagen]

Peter Rolf wrote:

> test graphic is the same as in
> 
> http://archive.contextgarden.net/message/20090901.094156.1dc47c81.en.html

no such message here

> So you should be able to produce the error with that example. The last 
> time I simply used the old (commented) definition and everything worked 
> again. I even looked at the definition of leaders that time (last used 
> in LaTeX around eight years ago) and I think \zeropoint is no valid glue 
> value here.

is more a hmode/vmode issue

>> there are a few more places where this is needed and in due time it 
>> will be sorted out
>>
> I don't know if I should laugh or cry here. It took me nearly two days 
> to make that minimal example. I'll interpret your last sentence as black 
> humour... :)

well, imagine the lake of tears i have in my garden then due to all 
those past bugs and such

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: overprint bug (mkiv)

[Peter Rolf]

Hans Hagen schrieb:
> Peter Rolf wrote:
>
>> test graphic is the same as in
>>
>> http://archive.contextgarden.net/message/20090901.094156.1dc47c81.en.html 
>>
>
> no such message here

i'll try to make a minimal example tomorrow. my current failing example 
is a document with six graphics (windows) on five pages.

>
>> So you should be able to produce the error with that example. The 
>> last time I simply used the old (commented) definition and everything 
>> worked again. I even looked at the definition of leaders that time 
>> (last used in LaTeX around eight years ago) and I think \zeropoint is 
>> no valid glue value here.
>
> is more a hmode/vmode issue
seems so, as the old version gives

! You can't use `\prevdepth' in horizontal mode.
\nointerlineskip ->\prevdepth
                              -\thousandpoint
<argument> ...SCB@arrowbuttonsrc \nointerlineskip

>
>>> there are a few more places where this is needed and in due time it 
>>> will be sorted out
>>>
>> I don't know if I should laugh or cry here. It took me nearly two 
>> days to make that minimal example. I'll interpret your last sentence 
>> as black humour... :)
>
> well, imagine the lake of tears i have in my garden then due to all 
> those past bugs and such
>
:))   indeed, you must have a lot of black humour for such a job........
but it is also said that nobody in the world can handle (salt) water 
better than the dutch. so i don't worry too much. ;)

> Hans
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | fax: 038 477 53 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  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>


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___________________________________________________________________________________

Re: overprint bug (mkiv)

[luigi scarso]

> but it is also said that nobody in the world can handle (salt) water better
> than the dutch
ahem,  and Venetian ?

-- 
luigi
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Re: overprint bug (mkiv)

[Peter Rolf]

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Hans Hagen schrieb:
> Peter Rolf wrote:
>
>> test graphic is the same as in
>>
>> http://archive.contextgarden.net/message/20090901.094156.1dc47c81.en.html 
>>
>
> no such message here
>
>> So you should be able to produce the error with that example. The 
>> last time I simply used the old (commented) definition and everything 
>> worked again. I even looked at the definition of leaders that time 
>> (last used in LaTeX around eight years ago) and I think \zeropoint is 
>> no valid glue value here.
>
> is more a hmode/vmode issue
>
test file attached (the lake in my garden is getting bigger).


@luigi: definitely yes (if you go back in time a few hundred years) ;)

[-- Attachment #2: test.tex --]
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\setupcolors[state=start]
\setuppagenumber[state=stop]

\startuniqueMPgraphic{FOO}
    fill unitsquare xyscaled(10,10) withcolor lightgray;
\stopuniqueMPgraphic


\starttext

\vbox{\normaloffinterlineskip
  \vskip5px
  \uniqueMPgraphic{FOO}
  \vskip5px}

\stoptext

[-- Attachment #3: Type: text/plain, Size: 487 bytes --]

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___________________________________________________________________________________

Re: overprint bug (mkiv)

[Hans Hagen]

Peter Rolf wrote:
> Hans Hagen schrieb:
>> Peter Rolf wrote:
>>
>>> test graphic is the same as in
>>>
>>> http://archive.contextgarden.net/message/20090901.094156.1dc47c81.en.html 
>>>
>>
>> no such message here
>>
>>> So you should be able to produce the error with that example. The 
>>> last time I simply used the old (commented) definition and everything 
>>> worked again. I even looked at the definition of leaders that time 
>>> (last used in LaTeX around eight years ago) and I think \zeropoint is 
>>> no valid glue value here.
>>
>> is more a hmode/vmode issue
>>
> test file attached (the lake in my garden is getting bigger).

\def\reuseMPbox#1#2#3#4#5%
   {\xdef\MPllx{#2}%
    \xdef\MPlly{#3}%
    \xdef\MPurx{#4}%
    \xdef\MPury{#5}%
    \hbox{\forcecolorhack\getobject{MP}{#1}}}

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: overprint bug (mkiv)

[Peter Rolf]

Hans Hagen schrieb:
> Peter Rolf wrote:
>> Hans Hagen schrieb:
>>> Peter Rolf wrote:
>>>
>>>> test graphic is the same as in
>>>>
>>>> http://archive.contextgarden.net/message/20090901.094156.1dc47c81.en.html 
>>>>
>>>
>>> no such message here
>>>
>>>> So you should be able to produce the error with that example. The 
>>>> last time I simply used the old (commented) definition and 
>>>> everything worked again. I even looked at the definition of leaders 
>>>> that time (last used in LaTeX around eight years ago) and I think 
>>>> \zeropoint is no valid glue value here.
>>>
>>> is more a hmode/vmode issue
>>>
>> test file attached (the lake in my garden is getting bigger).
>
> \def\reuseMPbox#1#2#3#4#5%
>   {\xdef\MPllx{#2}%
>    \xdef\MPlly{#3}%
>    \xdef\MPurx{#4}%
>    \xdef\MPury{#5}%
>    \hbox{\forcecolorhack\getobject{MP}{#1}}}
>
:)

I should concentrate my search on that macro next time.

> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | fax: 038 477 53 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  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>

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