Re: overprint bug (mkiv)

[Hans Hagen <pragma@wxs.nl>]

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

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                                           Hans Hagen | PRAGMA ADE
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