Bug 443008 - ugly ligatures
Summary: ugly ligatures
Keywords:
Status: CLOSED UPSTREAM
Alias: None
Product: Fedora
Classification: Fedora
Component: pango
Version: 8
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Behdad Esfahbod
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-04-18 05:50 UTC by Daniel Colascione
Modified: 2008-04-18 16:58 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2008-04-18 16:58:53 UTC
Type: ---

Attachments (Terms of Use)
ugly ligatures (11.46 KB, image/png)
2008-04-18 05:50 UTC, Daniel Colascione 		no flags Details
same word, MOZ_DISABLE_PANGO=1 (11.50 KB, image/png)
2008-04-18 05:56 UTC, Daniel Colascione 		no flags Details
Add an attachment (proposed patch, testcase, etc.)

Description Daniel Colascione 2008-04-18 05:50:21 UTC 
Description of problem:
See attached screenshot. DejaVu is the default font, and its western ligatures
look, well, ugly, and are disconcerting. I can reproduce the problem with GTK
programs but not QT ones.

Version-Release number of selected component (if applicable):
pango-1.18

How reproducible:
Every time

Steps to Reproduce:
1. Use DejaVu LGC or another font with ligatures
2. Type "confirms" (or "firefox") western text into Pango-using program
3. See apparent ugly baseline shift
  
Actual results:
Ugly ligatures makes text look misaligned

Expected results:
Characters that appear to share a baseline

Additional info:
Comment 1 Daniel Colascione 2008-04-18 05:50:21 UTC 
Created attachment 302837 [details]
ugly ligatures
Comment 2 Daniel Colascione 2008-04-18 05:56:44 UTC 
Created attachment 302839 [details]
same word, MOZ_DISABLE_PANGO=1

Disabling Pango eliminates the problem.
Comment 3 Ben Laenen 2008-04-18 11:11:54 UTC 
IIRC, that problem happened when using the Freetype autohinter. Switching to 
the proper bytecode interpreter for font hinting solves that.
Comment 4 Nicolas Mailhot 2008-04-18 11:36:41 UTC 
Then that's a freetype not pango bug IMHO. Please report it upstream.
Comment 5 Behdad Esfahbod 2008-04-18 16:58:53 UTC 
yeah, it's autohinter issue with freetype.
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