Difference between revisions of "User:Thisoldman"

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'''Anti-aliasing'''[http://en.wikipedia.org/wiki/Anti-aliasing] of fonts is available with Sun Java 1.6 on Linux. To do this on a per user basis, add the following line to the user's '''~/.bashrc'''.
 
'''Anti-aliasing'''[http://en.wikipedia.org/wiki/Anti-aliasing] of fonts is available with Sun Java 1.6 on Linux. To do this on a per user basis, add the following line to the user's '''~/.bashrc'''.
 
  export _JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=gasp'
 
  export _JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=gasp'
The value, ''gasp,'' is one of seven possible settings for ''-Dawt.useSystemAAFontSettings.''[http://java.sun.com/javase/6/docs/technotes/guides/2d/flags.html] These settings are:
+
The value, ''gasp,'' is one of seven possible settings for ''-Dawt.useSystemAAFontSettings.''[http://java.sun.com/javase/6/docs/technotes/guides/2d/flags.html] These settings are:{{sn|'''TrueType'''[http://en.wikipedia.org/wiki/TrueType] fonts have a '''GASP''' table[http://www.microsoft.com/typography/otspec/gasp.htm] ('''G'''rid-fitting '''A'''nd '''S'''can-conversion '''P'''rocedure) containing the font creator's display recommendations for font use at different point sizes. Some sizes are recommended to be fully anti-aliased, others are to be hinted, and some sizes are recommended to be displayed as bitmaps. Combinations are sometimes used for font display at certain point sizes.}}
*{{Codeline|off}} or {{Codeline|false}} or {{Codeline|default}} (These are equivalent values for no anti-aliasing).{{sn|'''TrueType'''[http://en.wikipedia.org/wiki/TrueType] fonts have a '''GASP''' table[http://www.microsoft.com/typography/otspec/gasp.htm] ('''G'''rid-fitting '''A'''nd '''S'''can-conversion '''P'''rocedure) containing the font creator's display recommendations for font use at different point sizes. Some sizes are recommended to be fully anti-aliased, others are to be hinted, and some sizes are recommended to be displayed as bitmaps. Combinations are sometimes used for font display at certain point sizes.}}
+
 
 +
{|
 +
|*{{Codeline|off}} or {{Codeline|false}} or {{Codeline|default}} || These are equivalent values for no anti-aliasing.
 +
|}
 
*{{Codeline|on}}
 
*{{Codeline|on}}
*{{Codeline|gasp}} (uses the font's built-in hinting instructions)
+
*{{Codeline|gasp}} -- Uses the font's built-in hinting instructions.
*{{Codeline|lcd}} or {{Codeline|lcd_hrgb}} (equivalent values)
+
*{{Codeline|lcd}} or {{Codeline|lcd_hrgb}} -- Equivalent settings
 
*{{Codeline|lcd_hbgr}}
 
*{{Codeline|lcd_hbgr}}
 
*{{Codeline|lcd_vrgb}}
 
*{{Codeline|lcd_vrgb}}
 
*{{Codeline|lcd_vbgr}}
 
*{{Codeline|lcd_vbgr}}
 +
 
The ''gasp'' and ''lcd'' settings work well in many instances.
 
The ''gasp'' and ''lcd'' settings work well in many instances.
  

Revision as of 02:48, 11 September 2009

Java (Sun) Fonts

Users may find the default Java fonts and their display in Java applications unpleasant. Several methods to improve font display in the Sun Java Runtime Environment (JRE)[1] are available. The methods may be used separately, but many users will find better results by combining them.

Anti-aliasing

Anti-aliasing[2] of fonts is available with Sun Java 1.6 on Linux. To do this on a per user basis, add the following line to the user's ~/.bashrc.

export _JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=gasp'

The value, gasp, is one of seven possible settings for -Dawt.useSystemAAFontSettings.[3] These settings are:Template:Sn

*Template:Codeline or Template:Codeline or Template:Codeline These are equivalent values for no anti-aliasing.

The gasp and lcd settings work well in many instances.

For the above change to take effect, ~/.bashrc must be sourced as the normal user.

$ source ~/.bashrc

Open a new instance of a Java application to test the changes made.

Font Selection

The Lucida fonts[4] distributed with the Sun JRE are used by many Java applications by default. These fonts were designed for low resolution CRT displays and printers.[5] Many users will wish to use other fonts. TrueType fonts appear to be the best supported format in Java.

Java applications that are coded to use a specific TrueType font must be given the path to that font. TrueType fonts are located in the directory /usr/share/fonts/TTF. Add the following line to ~/.bashrc to enable these fonts.

export JAVA_FONTS=/usr/share/fonts/TTF

Source ~/.bashrc as the normal user for the change to take effect.

$ source ~/.bashrc

Java applications that don't specify a font will use the default Lucida fonts. This default can be changed to a different installed font, on a system-wide basis, by the creation or editing of a file named /opt/java/jre/lib/fontconfig.properties.

As root, change directory to /opt/java/jre/lib and copy fontconfig.properties.src to fontconfig.properties and then, still as root, open fontconfig.properties in an editor.

# cd /opt/java/jre/lib
# cp fontconfig.properties.src fontconfig.properties
# nano fontconfig.properties      ## Editor is the user's choice.
Note: Encodings other than Latin-1, or ISO 8859-1,[6] are shown in the RedHat,[7] SuSE,[8] Sun[9] and Turbo[10] fontconfig.properties.*.src files. Some users will find these files to be better sources for editing than the simple fontconfig.properties.src file used in this article. In all cases the edited file should be saved as fontconfig.properties.

The font names used by Java applications are in the form of genericFontName.style.subset, for example,"Template:Codeline". These generic fonts are mapped to installed fonts using names in the format specified by the X Logical Font Description (XLFD)[11] convention. This convention names a font using fourteen descriptors, in this manner: -foundry-family-weight-slant-setWidth-additionalStyle-

serif.plain.latin-1=-b&h-lucidabright-medium-r-normal--*-%d-*-*-p-*-iso8859-1

The Java fonts are mapped to TrueType fonts using X Logical Font Description (XLFD)[12] conventions. The %d is used as a placeholder in the font description for the point size. The Java application will replace %d at runtime.

You may find the utility, xfontsel, useful to display fonts and to discover their XLFD name. Xfontsel is part of the xorg-utils package.

Below are portions of a fontconfig.properties file after modifications have been completed. All the Lucida fonts have been replaced by variations of DejaVu[13] fonts. Because the DejaVu fonts don't have italic versions, the oblique versions were substituted for them; -o- replaces -i- in the XLFD.

# Version -- a version number is required.
# IMPORTANT -- Do not delete the next line. Ever.
version=1

# Component Font Mappings
# gen_name.style.subset=
#       -fndry-fmly-wght-slant-sWdth-adstyle-pxlsz-ptSz-resx-resy-spc-avgWdth-rgstry-encdng

serif.plain.latin-1=-misc-dejavu serif-medium-r-normal-*-*-%d-*-*-p-*-iso8859-1
serif.bold.latin-1=-misc-dejavu serif-bold-r-normal-*-*-%d-*-*-p-*-iso8859-1
serif.italic.latin-1=-misc-dejavu serif-medium-i-normal-*-*-%d-*-*-p-*-iso8859-1
serif.bolditalic.latin-1=-misc-dejavu serif-bold-i-normal-*-*-%d-*-*-p-*-iso8859-1

sansserif.plain.latin-1=-misc-dejavu sans-medium-r-normal-*-*-%d-*-*-p-*-iso8859-1

--- [Omitted] ---

dialoginput.italic.latin-1=-misc-dejavu sans mono-medium-o-normal-*-*-%d-*-*-m-*-iso8859-1
dialoginput.bolditalic.latin-1=-misc-dejavu sans mono-bold-o-normal-*-*-%d-*-*-m-*-iso8859-1

After the changes have been saved to fontconfig.properties, the editor may be closed and the user should drop root privileges. Open a new instance of a Java application to test the changes.