[Fedora-i18n-bugs] [Bug 537450] New: cpi setting not used accurately

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Summary: cpi setting not used accurately

https://bugzilla.redhat.com/show_bug.cgi?id=537450

           Summary: cpi setting not used accurately
           Product: Red Hat Enterprise Linux 5
           Version: 5.4
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: medium
          Priority: low
         Component: paps
        AssignedTo: tagoh at redhat.com
        ReportedBy: twaugh at redhat.com
         QAContact: desktop-bugs at redhat.com
                CC: tagoh at redhat.com, fedora-fonts-bugs-list at redhat.com,
                    fedora-i18n-bugs at redhat.com
        Depends on: 524883
   Estimated Hours: 0.0
    Classification: Red Hat
    Target Release: ---
          Clone Of: 524883


Presumably this also affects Red Hat Enterprise Linux 5.

+++ This bug was initially created as a clone of Bug #524883 +++

Created an attachment (id=362101)
 --> (https://bugzilla.redhat.com/attachment.cgi?id=362101)
ppd.ppd

Description of problem:
When used as texttopaps, the 'cpi' option is only used to scale the font to the
nearest integer point size.  This isn't nearly good enough: it must be *exact*.

The reason is that it is used for controlling the number of columns of text
print, and this needs to be set to e.g. 132, or 80, or whatever is required. 
Unfortunately the only way to set it is indirectly, via 'cpi'.  Of course this
depends on the page size used, as well as the printer margins.

Here is a test case for verifying that it is operating correctly.  The CUPS
filter 'texttops' passes this test, and 'texttopaps' must as well.  The test
case consists of a PPD 'ppd.ppd', an input file '132.txt', and a command line
given below.

Version-Release number of selected component (if applicable):
paps-0.6.8-10.fc12.x86_64

How reproducible:
100%

Steps to Reproduce:
PPD=ppd.ppd \
 /usr/lib/cups/filter/texttopaps 1 tim '' 1 \
 'cpi=17.6 lpi=6.7 page-bottom=36 page-left=36 \
 page-right=36 page-top=36 scaling=100' 132.txt > out.ps

Actual results:
See actual.jpg.

Expected results:
When viewing the resulting PostScript (with, say, evince), the result should
look as in expected.jpg: in particular, there should be exactly 132 characters
per line, and the output should fit on a single side of US Letter paper.

--- Additional comment from twaugh at redhat.com on 2009-09-22 11:22:41 EDT ---

Created an attachment (id=362103)
 --> (https://bugzilla.redhat.com/attachment.cgi?id=362103)
expected.jpg

--- Additional comment from twaugh at redhat.com on 2009-09-22 11:23:38 EDT ---

Created an attachment (id=362105)
 --> (https://bugzilla.redhat.com/attachment.cgi?id=362105)
132.txt

--- Additional comment from twaugh at redhat.com on 2009-09-22 11:24:05 EDT ---

Created an attachment (id=362106)
 --> (https://bugzilla.redhat.com/attachment.cgi?id=362106)
actual.jpg

--- Additional comment from tagoh at redhat.com on 2009-09-24 08:19:47 EDT ---

Does scaling option affect to the text printing?

--- Additional comment from twaugh at redhat.com on 2009-09-24 09:13:33 EDT ---

No, ignore 'scaling=100'.  The problem can be seen without that option.

--- Additional comment from tagoh at redhat.com on 2009-09-24 10:04:15 EDT ---

Thanks. well, the root cause is the scaling value is a bit sensitive and the
approximate width from Pango doesn't work enough. paps may needs to evaluate
each lines to figure out the scale X perhaps.

--- Additional comment from tagoh at redhat.com on 2009-10-14 06:50:56 EDT ---

Should be fixed in paps-0.6.8-11.fc13. please test.

--- Additional comment from tagoh at redhat.com on 2009-10-19 03:54:31 EDT ---

Created an attachment (id=365205)
 --> (https://bugzilla.redhat.com/attachment.cgi?id=365205)
Fixed screenshot on evince

--- Additional comment from tagoh at redhat.com on 2009-10-19 03:55:09 EDT ---

If it looks good, I'll propose the fix for f12-final too.

--- Additional comment from twaugh at redhat.com on 2009-10-19 06:30:38 EDT ---

Yes, looks perfect.  Thanks!

--- Additional comment from tagoh at redhat.com on 2009-10-20 01:10:30 EDT ---

pushed to F-12 and tagged for f12-final now.

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