JDK-6463476 : Subpixel rendering: courier W 12pt looks bad
  • Type: Bug
  • Component: client-libs
  • Sub-Component: 2d
  • Affected Version: 6
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2006-08-24
  • Updated: 2010-04-04
  • Resolved: 2006-08-31
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JDK 6
6 b98Fixed
Related Reports
Relates :  
JDK-6349653 - Tahoma: Diagonal lines in glyphs are not thick enough in the subpixel mode
Relates :  
JDK-6616758 - Regression: Subpixel Courier New W looks bad
Relates :  
JDK-6449753 - Differences between Mustang rasterizer and MS Cleartype with subpixel AA
Description
12pt W looks bad if horizontal subpixel text rendering hints are used (e.g. HRGB mode).
It does look better if no antialiasing is used or with vertical subpixel rendering.
Comments
EVALUATION The difference is introduced by our current approach to hint glyphs for subpixel rendering. At the moment we hint glyph and later oversample. Unfortunatelly in case of W bottom part of hinted glyph has contours exceeding pixels bounds a little bit. However, oversampled contour makes this difference noticeable because it is about subpixel. See 6449753 for more notes on potential hinting improvements.
24-08-2006