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Bug 519575 - Wrong inter-letter spacing in print and PDF.
Wrong inter-letter spacing in print and PDF.
Status: RESOLVED DUPLICATE of bug 558350
Product: pango
Classification: Platform
Component: win32
1.18.x
Other All
: Normal normal
: ---
Assigned To: gtk-win32 maintainers
pango-maint
Depends on:
Blocks:
 
 
Reported: 2008-02-29 17:00 UTC by Bastiaan
Modified: 2009-01-03 01:17 UTC
See Also:
GNOME target: ---
GNOME version: ---

Attachments
Illustrating code. (10.92 KB, text/plain)
2008-02-29 17:01 UTC, Bastiaan 		Details
PDF produced by Cairo. (43.11 KB, application/pdf)
2008-02-29 19:11 UTC, Bastiaan 		Details
Print output produced by PDFCreator (23.07 KB, application/pdf)
2008-02-29 19:14 UTC, Bastiaan 		Details
etc\pango\pango.aliases (510 bytes, text/plain)
2008-03-10 17:47 UTC, Bastiaan 		Details

Description Bastiaan 2008-02-29 17:00:46 UTC 
Please describe the problem:
In specific cases of code, the inter-letter spacing is slightly off. The problem can suddenly go away when changing seemingly unrelated code.

Steps to reproduce:
1. Compile and run the attatched code
2. Export to PDF
3. Print to PDF through PDFCreator.


Actual results:
Some letters run into each other, others are spaced too wide apart. The problem appears between different pairs in different font sizes.

Expected results:
Proper and consistent spacing, like what you get if you follow the comments on lines 25-43 or 62-66 or 120.

Does this happen every time?
Yes, but you never know what you get if you continue coding (I don't (know)).

Other information:
Comment 1 Bastiaan 2008-02-29 17:01:36 UTC 
Created attachment 106279 [details]
Illustrating code.
Comment 2 Bastiaan 2008-02-29 19:11:27 UTC 
Created attachment 106290 [details]
PDF produced by Cairo.
Comment 3 Bastiaan 2008-02-29 19:14:34 UTC 
Created attachment 106291 [details]
Print output produced by PDFCreator

Rows 26-37 have been uncommented.
Comment 4 Bastiaan 2008-03-07 12:10:49 UTC 
Could it be that what we see here are rounding errors? If I understand matters correctly, then the pango device units are cairo units when using pango_cairo. In this case the cairo context is scaled to work in mm, which is a rather large unit compared to screen pixels, let alone printer dots. Or is it that pango assumes that glyphs need to be positioned at integer device units, i.e, whole millimeters?
Comment 5 Tor Lillqvist 2008-03-10 17:02:39 UTC 
The problem seems to be gone in Pango trunk at least for the PDF export. I don't have any other version of Pango now on this machine so I can't check against Pango 1.18, sorry. But anyway, trunk will become Pango 1.20 in a few days, so when that has been released and a Windows build appears, please check with that.
Comment 6 Behdad Esfahbod 2008-03-10 17:04:17 UTC 
pango-1.20.0 was released an hour ago...
Comment 7 Tor Lillqvist 2008-03-10 17:13:46 UTC 
Oops, I should build, package and upload it then. Or actually, I'll wait for GLib 2.16.0 first.
Comment 8 Tor Lillqvist 2008-03-10 17:36:47 UTC 
Actually I don't seem to be able to reproduce the export to PDF problem (haven't tried the printing one) even with Pango 1.18.4, GTK+ 2.12.8 and cairo 1.4.14. What exact versions of Pango, GTK+ and cairo are you using? What does the etc/pango.aliases file that your Pango uses look like?
Comment 9 Bastiaan 2008-03-10 17:44:41 UTC 
Pango 1.18.4
Cairo 1.4.14
GTK+ 2.12.6

pango.aliases will follow in a moment.
Comment 10 Bastiaan 2008-03-10 17:47:11 UTC 
Created attachment 106994 [details]
etc\pango\pango.aliases
Comment 11 Behdad Esfahbod 2009-01-03 01:17:16 UTC 

*** This bug has been marked as a duplicate of 558350 ***