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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 44672] Right aligned text within table cells is not correctly aligned using PCL
Date Tue, 25 Mar 2008 20:01:14 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=44672





--- Comment #2 from Jeremias Maerki <jeremias@apache.org>  2008-03-25 13:01:14 PST ---
Created an attachment (id=21714)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=21714)
Some demo output (made from PCL output by GhostPCL)

I can't see exactly what you described. In my tests some of the right-most
characters are slightly shifted to the right and into the border I made around
the table to get some boundaries. I've enhanced your example a bit and attached
the resulting TIFF here. This first part uses "Helvetica" which is mapped to a
PCL standard font (text-rendering set to "auto") and the second part uses a
TrueType font ("DejaVu Serif") which is painted using bitmaps. You can see that
in the second part there are no such effects.

The problem is the following: We don't have the exact font metrics of those
native PCL fonts. They may even be different from printer to printer which
would explain your different results. So the result is just an approximation
for the case where a native PCL font is used. The good thing about the native
font is a smaller PCL file but obviously, it comes with a downside.

Fortunately, there is a setting where you can force FOP to output all fonts
using bitmaps which should make your problem go away. See the "text-rendering"
setting in http://xmlgraphics.apache.org/fop/0.95/output.html#pcl-configuration
(you need to switch from "auto" to "bitmap")

The alternative would be to implement TrueType font embedding support for the
PCL renderer but I've looked into this and it looks very complicated. As a
side-note: Even most Windows PCL printer drivers generate all text as bitmaps
rather than PCL text.

Anyway, you've asked for pointers into the code:
org.apache.fop.render.pcl.PCLRenderer, method renderText(TextArea)
The local variable "pclFont" determines whether the text is painted as PCL text
or as bitmaps.

HTH


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