A peer for fonts that are used inside Classpath. The purpose of
this interface is to abstract from platform-specific font handling
in the Classpath implementation of java.awt.Font and related
classes.
State kept by the peer: a peer is generated for each Font
object in the default implementation. If you wish to share peers between
fonts, you will need to subclass both ClasspathFontPeer and
ClasspathToolKit
.
Thread Safety: Methods of this interface may be called
from arbitrary threads at any time. Implementations of the
ClasspathFontPeer
interface are required to perform
the necessary synchronization.
canDisplay
public abstract boolean canDisplay(Font font,
int c)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
canDisplayUpTo
public abstract int canDisplayUpTo(Font font,
CharacterIterator i,
int start,
int limit)
Implementation of Font.canDisplay(String)
,
Font.canDisplay(char [], int, int)
, and
Font.canDisplay(CharacterIterator, int, int)
.
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
deriveFont
public Font deriveFont(Font font,
float size)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
deriveFont
public Font deriveFont(Font font,
int style)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
deriveFont
public Font deriveFont(Font font,
int style,
float size)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
deriveFont
public Font deriveFont(Font font,
int style,
AffineTransform t)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
deriveFont
public Font deriveFont(Font font,
AffineTransform t)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
deriveFont
public Font deriveFont(Font font,
Map<K,V> attrs)
Implementation of Font.deriveFont(Map)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getAttributes
public Map<K,V> getAttributes(Font font)
Implementation of Font.getAttributes()
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getBaselineFor
public abstract byte getBaselineFor(Font font,
char c)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getFamily
public String getFamily(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getFamily
public String getFamily(Font font,
Locale lc)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getFontMetrics
public abstract FontMetrics getFontMetrics(Font font)
Implementation of Font.getFontMetrics()
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getFontName
public String getFontName(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getFontName
public String getFontName(Font font,
Locale lc)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getGlyphName
public abstract String getGlyphName(Font font,
int glyphIndex)
Returns a name for the specified glyph. This is useful for
generating PostScript or PDF files that embed some glyphs of a
font. If the implementation follows glyph naming conventions
specified by Adobe, search engines can extract the original text
from the generated PostScript and PDF files.
This method is currently not used by GNU Classpath. However,
it would be very useful for someone wishing to write a good
PostScript or PDF stream provider for the
javax.print
package.
Names are not unique: Under some rare circumstances,
the same name can be returned for different glyphs. It is
therefore recommended that printer drivers check whether the same
name has already been returned for antoher glyph, and make the
name unique by adding the string ".alt" followed by the glyph
index.
This situation would occur for an OpenType or TrueType font
that has a
post
table of format 3 and provides a
mapping from glyph IDs to Unicode sequences through a
Zapf
table. If the same sequence of Unicode
codepoints leads to different glyphs (depending on contextual
position, for example, or on typographic sophistication level),
the same name would get synthesized for those glyphs. To avoid
this, the font peer would have to go through the names of all
glyphs, which would make this operation very inefficient with
large fonts.
font
- the font containing the glyph whose name is
requested.glyphIndex
- the glyph whose name the caller wants to
retrieve.
- the glyph name, or
null
if a font does not
provide glyph names.
getItalicAngle
public float getItalicAngle(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getMissingGlyphCode
public abstract int getMissingGlyphCode(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getName
public String getName(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getNumGlyphs
public abstract int getNumGlyphs(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getPostScriptName
public abstract String getPostScriptName(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getSize
public float getSize(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getStyle
public int getStyle(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
getSubFamilyName
public abstract String getSubFamilyName(Font font,
Locale locale)
Returns the name of this font face inside the family, for example
“Light”.
This method is currently not used by
Font
. However,
this name would be needed by any serious desktop publishing
application.
font
- the font whose sub-family name is requested.locale
- the locale for which to localize the name. If
locale
is null
, the returned name is
localized to the user’s default locale.
- the name of the face inside its family, or
null
if the font does not provide a sub-family name.
getTransform
public AffineTransform getTransform(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
hasUniformLineMetrics
public abstract boolean hasUniformLineMetrics(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
isBold
public boolean isBold(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
isItalic
public boolean isItalic(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
isPlain
public boolean isPlain(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
isTransformed
public boolean isTransformed(Font font)
font
- the font this peer is being called from. This may be
useful if you are sharing peers between Font objects. Otherwise it may
be ignored.
layoutGlyphVector
public abstract GlyphVector layoutGlyphVector(Font font,
FontRenderContext frc,
char[] chars,
int start,
int limit,
int flags)
font
- the font object that the created GlyphVector will return
when it gets asked for its font. This argument is needed because the
public API of GlyphVector
works with Font
,
not with font peers.
ClasspathFontPeer.java -- Font peer used by GNU Classpath.
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version.