CustomFontMetricsMapper (Apache FOP Core 2.11 API)
Date: 2025-04-24

org.apache.fop.render.java2d

## Class CustomFontMetricsMapper

- java.lang.Object
- - org.apache.fop.fonts.Typeface
  - - org.apache.fop.render.java2d.CustomFontMetricsMapper

- All Implemented Interfaces:
    Positionable, Substitutable, FontMetrics, FontMetricsMapper

      public class CustomFontMetricsMapper
      extends Typeface
      implements FontMetricsMapper, Substitutable, Positionable

  FontMetricsMapper that delegates most methods to an underlying `FontMetrics` instance. This class was designed to allow the underlying `Font` to be loaded from a user-configured file not registered in the current graphics environment.

- - ### Field Summary

    - ### Fields inherited from class org.apache.fop.fonts.Typeface

      `eventListener, NOT_FOUND`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CustomFontMetricsMapper(CustomFont fontMetrics)` Construction of this class results in the immediate construction of the underlying `Font`.
    `CustomFontMetricsMapper(FontUris fontUris, EmbedFontInfo configFontInfo, InternalResourceResolver resourceResolver)`
    `CustomFontMetricsMapper(LazyFont fontMetrics, InputStream fontSource)` Construction of this class results in the immediate construction of the underlying `Font`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getAscender(int size)` Returns the ascent of the font described by this FontMetrics object.
    `Rectangle` | `getBoundingBox(int glyphIndex, int size)` Returns the bounding box of the glyph at the given index, for the given font size.
    `int` | `getCapHeight(int size)` Returns the size of a capital letter measured from the font's baseline.
    `int` | `getDescender(int size)` Returns the descent of the font described by this FontMetrics object.
    `String` | `getEmbedFontName()` Returns the font name for font embedding (may include a prefix, Example: "1E28bcArialMT").
    `String` | `getEncodingName()` Get the encoding of the font.
    `Set<String>` | `getFamilyNames()` Returns the font's family names as a Set of Strings (Example: "Helvetica").
    `Font` | `getFont(int size)` Gets a `Font` instance of the font that this `FontMetrics` describes in the desired size.
    `String` | `getFontName()` Returns the "PostScript" font name (Example: "Helvetica-BoldOblique").
    `FontType` | `getFontType()` Returns the type of the font.
    `URI` | `getFontURI()` Returns the URI of the font file from which these metrics were loaded.
    `String` | `getFullName()` Returns the font's full name (Example: "Helvetica Bold Oblique").
    `Map` | `getKerningInfo()` Returns the kerning map for the font.
    `Typeface` | `getRealFont()`
    `int` | `getStrikeoutPosition(int size)` Returns the distance from the baseline to the center of the strikeout line (negative value indicates below baseline).
    `int` | `getStrikeoutThickness(int size)` Returns the thickness of the strikeout line.
    `int` | `getUnderlinePosition(int size)` Returns the distance from the baseline to the center of the underline (negative value indicates below baseline).
    `int` | `getUnderlineThickness(int size)` Returns the thickness of the underline.
    `int` | `getWidth(int i, int size)` Return the width (in 1/1000ths of point size) of the character at code point i.
    `int[]` | `getWidths()` Return the array of widths.
    `int` | `getXHeight(int size)` Determines the typical font height of this FontMetrics object
    `boolean` | `hasChar(char c)` Determines whether this font contains a particular character/glyph.
    `boolean` | `hasKerningInfo()` Indicates if the font has kerning information.
    `boolean` | `isMultiByte()` Determines whether the font is a multibyte font.
    `char` | `mapChar(char c)` Map a Unicode character to a code point in the font.
    `int[][]` | `performPositioning(CharSequence cs, String script, String language)` Perform glyph positioning using an implied font size.
    `int[][]` | `performPositioning(CharSequence cs, String script, String language, int fontSize)` Perform glyph positioning.
    `boolean` | `performsPositioning()` Determines if font performs glyph positioning.
    `boolean` | `performsSubstitution()` Determines if font performs glyph substitution.
    `CharSequence` | `performSubstitution(CharSequence cs, String script, String language, List associations, boolean retainControls)` Perform substitutions on characters to effect glyph substitution.
    `CharSequence` | `reorderCombiningMarks(CharSequence cs, int[][] gpa, String script, String language, List associations)` Reorder combining marks in character sequence so that they precede (within the sequence) the base character to which they are applied.

    - ### Methods inherited from class org.apache.fop.fonts.Typeface

      `getMaxAscent, hadMappingOperations, hasFeature, isCID, notifyMapOperation, setEventListener, toString, warnMissingGlyph`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface org.apache.fop.fonts.FontMetrics

      `getMaxAscent, hasFeature`

- - ### Constructor Detail

    - #### CustomFontMetricsMapper

          public CustomFontMetricsMapper(CustomFont fontMetrics)
                                  throws FontFormatException,
                                         IOException

      Construction of this class results in the immediate construction of the underlying `Font`.
      Parameters:
        `fontMetrics` - the metrics of the custom font
      Throws:
        `FontFormatException` - if a bad font is loaded
        `IOException` - if an I/O error occurs

    - #### CustomFontMetricsMapper

          public CustomFontMetricsMapper(LazyFont fontMetrics,
                                         InputStream fontSource)
                                  throws FontFormatException,
                                         IOException

      Construction of this class results in the immediate construction of the underlying `Font`.
      Parameters:
        `fontMetrics` - the font
        `fontSource` - the font source to access the font
      Throws:
        `FontFormatException` - if a bad font is loaded
        `IOException` - if an I/O error occurs

    - #### CustomFontMetricsMapper

          public CustomFontMetricsMapper(FontUris fontUris,
                                         EmbedFontInfo configFontInfo,
                                         InternalResourceResolver resourceResolver)

  - ### Method Detail

    - #### getEncodingName

          public final String getEncodingName()

      Get the encoding of the font.
      Specified by:
        `getEncodingName` in class `Typeface`
      Returns:
        the encoding

    - #### hasChar

          public final boolean hasChar(char c)

      Determines whether this font contains a particular character/glyph.
      Specified by:
        `hasChar` in class `Typeface`
      Parameters:
        `c` - character to check
      Returns:
        True if the character is supported, Falso otherwise

    - #### mapChar

          public final char mapChar(char c)

      Map a Unicode character to a code point in the font.
      Specified by:
        `mapChar` in class `Typeface`
      Parameters:
        `c` - character to map
      Returns:
        the mapped character

    - #### getFont

          public final Font getFont(int size)

      Gets a `Font` instance of the font that this `FontMetrics` describes in the desired size.
      Specified by:
        `getFont` in interface `FontMetricsMapper`
      Parameters:
        `size` - font size
      Returns:
        font with the desired characteristics.

    - #### getAscender

          public final int getAscender(int size)

      Returns the ascent of the font described by this FontMetrics object. It returns the nominal ascent within the em box.
      Specified by:
        `getAscender` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        ascent in milliponts

    - #### getCapHeight

          public final int getCapHeight(int size)

      Returns the size of a capital letter measured from the font's baseline.
      Specified by:
        `getCapHeight` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        height of capital characters

    - #### getDescender

          public final int getDescender(int size)

      Returns the descent of the font described by this FontMetrics object.
      Specified by:
        `getDescender` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        descent in milliponts

    - #### getEmbedFontName

          public final String getEmbedFontName()

      Returns the font name for font embedding (may include a prefix, Example: "1E28bcArialMT").
      Specified by:
        `getEmbedFontName` in interface `FontMetrics`
      Returns:
        the name for font embedding

    - #### getFamilyNames

          public final Set<String> getFamilyNames()

      Returns the font's family names as a Set of Strings (Example: "Helvetica").
      Specified by:
        `getFamilyNames` in interface `FontMetrics`
      Returns:
        the font's family names (a Set of Strings)

    - #### getFontName

          public final String getFontName()

      Returns the "PostScript" font name (Example: "Helvetica-BoldOblique").
      Specified by:
        `getFontName` in interface `FontMetrics`
      Returns:
        the font name

    - #### getFontURI

          public final URI getFontURI()

      Returns the URI of the font file from which these metrics were loaded.
      Specified by:
        `getFontURI` in interface `FontMetrics`
      Returns:
        the font file's URI

    - #### getFontType

          public final FontType getFontType()

      Returns the type of the font.
      Specified by:
        `getFontType` in interface `FontMetrics`
      Returns:
        the font type

    - #### getFullName

          public final String getFullName()

      Returns the font's full name (Example: "Helvetica Bold Oblique").
      Specified by:
        `getFullName` in interface `FontMetrics`
      Returns:
        the font's full name

    - #### getKerningInfo

          public final Map getKerningInfo()

      Returns the kerning map for the font.
      Specified by:
        `getKerningInfo` in interface `FontMetrics`
      Returns:
        the kerning map

    - #### getWidth

          public final int getWidth(int i,
                                    int size)

      Return the width (in 1/1000ths of point size) of the character at code point i.
      Specified by:
        `getWidth` in interface `FontMetrics`
      Parameters:
        `i` - code point index
        `size` - font size
      Returns:
        the width of the character

    - #### getWidths

          public final int[] getWidths()

      Return the array of widths.

      This is used to get an array for inserting in an output format. It should not be used for lookup.

      Specified by:
        `getWidths` in interface `FontMetrics`
      Returns:
        an array of widths

    - #### getBoundingBox

          public Rectangle getBoundingBox(int glyphIndex,
                                          int size)

      Description copied from interface: `FontMetrics`
      Returns the bounding box of the glyph at the given index, for the given font size.
      Specified by:
        `getBoundingBox` in interface `FontMetrics`
      Parameters:
        `glyphIndex` - glyph index
        `size` - font size
      Returns:
        the scaled bounding box scaled in 1/1000ths of the given size

    - #### getXHeight

          public final int getXHeight(int size)

      Determines the typical font height of this FontMetrics object
      Specified by:
        `getXHeight` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        font height in millipoints

    - #### getUnderlinePosition

          public int getUnderlinePosition(int size)

      Description copied from interface: `FontMetrics`
      Returns the distance from the baseline to the center of the underline (negative value indicates below baseline).
      Specified by:
        `getUnderlinePosition` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        the position in 1/1000ths of the font size

    - #### getUnderlineThickness

          public int getUnderlineThickness(int size)

      Description copied from interface: `FontMetrics`
      Returns the thickness of the underline.
      Specified by:
        `getUnderlineThickness` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        the thickness in 1/1000ths of the font size

    - #### getStrikeoutPosition

          public int getStrikeoutPosition(int size)

      Description copied from interface: `FontMetrics`
      Returns the distance from the baseline to the center of the strikeout line (negative value indicates below baseline).
      Specified by:
        `getStrikeoutPosition` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        the position in 1/1000ths of the font size

    - #### getStrikeoutThickness

          public int getStrikeoutThickness(int size)

      Description copied from interface: `FontMetrics`
      Returns the thickness of the strikeout line.
      Specified by:
        `getStrikeoutThickness` in interface `FontMetrics`
      Parameters:
        `size` - font size
      Returns:
        the thickness in 1/1000ths of the font size

    - #### hasKerningInfo

          public final boolean hasKerningInfo()

      Indicates if the font has kerning information.
      Specified by:
        `hasKerningInfo` in interface `FontMetrics`
      Returns:
        true if kerning is available.

    - #### isMultiByte

          public boolean isMultiByte()

      Determines whether the font is a multibyte font.
      Specified by:
        `isMultiByte` in interface `FontMetrics`
      Overrides:
        `isMultiByte` in class `Typeface`
      Returns:
        True if it is multibyte

    - #### performsPositioning

          public boolean performsPositioning()

      Determines if font performs glyph positioning.
      Specified by:
        `performsPositioning` in interface `Positionable`
      Returns:
        true if performs positioning

    - #### performPositioning

          public int[][] performPositioning(CharSequence cs,
                                            String script,
                                            String language,
                                            int fontSize)

      Perform glyph positioning.
      Specified by:
        `performPositioning` in interface `Positionable`
      Parameters:
        `cs` - character sequence to map to position offsets (advancement adjustments)
        `script` - a script identifier
        `language` - a language identifier
        `fontSize` - font size
      Returns:
        array (sequence) of 4-tuples of placement [PX,PY] and advance [AX,AY] adjustments, in that order, with one 4-tuple for each element of glyph sequence, or null if no non-zero adjustment applies

    - #### performPositioning

          public int[][] performPositioning(CharSequence cs,
                                            String script,
                                            String language)

      Perform glyph positioning using an implied font size.
      Specified by:
        `performPositioning` in interface `Positionable`
      Parameters:
        `cs` - character sequence to map to position offsets (advancement adjustments)
        `script` - a script identifier
        `language` - a language identifier
      Returns:
        array (sequence) of 4-tuples of placement [PX,PY] and advance [AX,AY] adjustments, in that order, with one 4-tuple for each element of glyph sequence, or null if no non-zero adjustment applies

    - #### performsSubstitution

          public boolean performsSubstitution()

      Determines if font performs glyph substitution.
      Specified by:
        `performsSubstitution` in interface `Substitutable`
      Returns:
        true if performs substitution.

    - #### performSubstitution

          public CharSequence performSubstitution(CharSequence cs,
                                                  String script,
                                                  String language,
                                                  List associations,
                                                  boolean retainControls)

      Perform substitutions on characters to effect glyph substitution. If some substitution is performed, it entails mapping from one or more input characters denoting textual character information to one or more output character codes denoting glyphs in this font, where the output character codes may make use of private character code values that have significance only for this font.
      Specified by:
        `performSubstitution` in interface `Substitutable`
      Parameters:
        `cs` - character sequence to map to output font encoding character sequence
        `script` - a script identifier
        `language` - a language identifier
        `associations` - optional list to receive list of character associations
        `retainControls` - if true, then retain control characters and their glyph mappings, otherwise remove
      Returns:
        output sequence (represented as a character sequence, where each character in the returned sequence denotes "font characters", i.e., character codes that map directly (1-1) to their associated glyphs

    - #### reorderCombiningMarks

          public CharSequence reorderCombiningMarks(CharSequence cs,
                                                    int[][] gpa,
                                                    String script,
                                                    String language,
                                                    List associations)

      Reorder combining marks in character sequence so that they precede (within the sequence) the base character to which they are applied. N.B. In the case of LTR segments, marks are not reordered by this, method since when the segment is reversed by BIDI processing, marks are automatically reordered to precede their base character.
      Specified by:
        `reorderCombiningMarks` in interface `Substitutable`
      Parameters:
        `cs` - character sequence within which combining marks to be reordered
        `gpa` - associated glyph position adjustments (also reordered)
        `script` - a script identifier
        `language` - a language identifier
        `associations` - optional list of associations to be reordered
      Returns:
        output sequence containing reordered "font characters"

    - #### getRealFont

          public Typeface getRealFont()

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