[pdftex] hello and color question

[Hans Hagen]

At 21:57 15/04/2004, you wrote:

>or do it in smarter way with TeX definitions, but is there any PDF 
>operator like save_color / restore_color?

since color can end up anywhere and the order of flushing can be any, and 
since there are many color models and occasional interactions with other 
mechanisms, a fool proof color mechanism is very tight to a macro-set 
(feature set).

>2. Graphic state of PDF page is restored to defaults at the begining of 
>each page. Therefore the following code
>
>\pdfliteral{.1 .2 .3 .4 k}
>first page
>\vfill\eject
>second one
>\end
>
>will produce only first page colorized. Is there any way to set some color 
>for the whole documents expect invoking \pdfliteral{...} in output 
>routines? Is it possible to do that with \pdfpagesattr?

you can of course hook it into the shipout: remember the current color and 
reset it at the start of a page (which of course is different for each 
macro package since there are different models for headers/footers/flushing 
these)

the only robust solution for this kind of features is a generic attributes 
handler (like the one for fonts) but even then, additional nodes 
interactions and side effects need to be controlled by the macro package.

Hans