[dvipdfmx] XObject form bounding box problem

[Petr Krajník]

Hi, while working an optimizing PDF output from dvipdfmx I found some 
strange thing when working on XObject forms. It seems, that the \hoffset 
and \voffset are added to the bounding box and xobject matrix. So the 
code would shifted values by \hoffset resp. \voffset.

I think that in many of use cases this problem is masked as user use 
pdf:literal or pdf:content specials that inserts the correct cm matrix 
that correct the coordinates. But these additional matrixes are not 
needed without the problem above.

Is there a reason for adding \hoffset and \voffset to the bounding box? 
I think its a bug as isolated xobject should not be bounded to these 
values. Or I missed something?

And also the default added color "0 g 0 G" on the begin of the stream is 
pretty useless as xobjects inherit this from the environment where the 
form is called. And if user want he can change it.

Thank you.

Best regards
Petr Krajnik