org.apache.pdfbox.pdmodel.font

Class PDFont

java.lang.Object

org.apache.pdfbox.pdmodel.font.PDFont

All Implemented Interfaces:

COSObjectable, PDFontLike

Direct Known Subclasses:

PDSimpleFont, PDType0Font

public abstract class PDFont
extends Object
implements COSObjectable, PDFontLike

This is the base class for all PDF fonts.

Author:

Ben Litchfield

Field Summary

Fields

Modifier and Type	Field and Description
protected static Matrix	DEFAULT_FONT_MATRIX
protected COSDictionary	dict

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PDFont(COSDictionary fontDictionary) Constructor.

Method Summary

Modifier and Type	Method and Description
abstract void	addToSubset(int codePoint) Adds the given Unicode point to the subset.
protected abstract byte[]	encode(int unicode) Encodes the given Unicode code point for use in a PDF content stream.
byte[]	encode(String text) Encodes the given string for use in a PDF content stream.
boolean	equals(Object other)
float	getAverageFontWidth() This will get the average font width for all characters.
COSDictionary	getCOSObject() Convert this standard java object to a COS object.
Vector	getDisplacement(int code) Returns the displacement vector (w0, w1) in text space, for the given character.
PDFontDescriptor	getFontDescriptor() Returns the font descriptor, may be null.
Matrix	getFontMatrix() Returns the font matrix, which represents the transformation from glyph space to text space.
Vector	getPositionVector(int code) Returns the position vector (v), in text space, for the given character.
float	getSpaceWidth() Determines the width of the space character.
protected org.apache.fontbox.afm.FontMetrics	getStandard14AFM() Returns the AFM if this is a Standard 14 font.
protected abstract float	getStandard14Width(int code) Returns the glyph width from the AFM if this is a Standard 14 font.
float	getStringWidth(String text) Returns the width of the given Unicode string.
String	getSubType() This will get the subtype of font.
protected org.apache.fontbox.cmap.CMap	getToUnicodeCMap() Get the /ToUnicode CMap.
String	getType() This will always return "Font" for fonts.
float	getWidth(int code) Returns the advance width of the given character, in glyph space.
protected List<Float>	getWidths() The widths of the characters.
int	hashCode()
boolean	isStandard14() Returns true if this font is one of the "Standard 14" fonts and receives special handling.
abstract boolean	isVertical() Returns true if the font uses vertical writing mode.
protected org.apache.fontbox.cmap.CMap	readCMap(COSBase base) Reads a CMap given a COS Stream or Name.
abstract int	readCode(InputStream in) Reads a character code from a content stream string.
protected void	setFontDescriptor(PDFontDescriptor fontDescriptor) Sets the font descriptor when embedding a font.
abstract void	subset() Replaces this font with a subset containing only the given Unicode characters.
String	toString()
String	toUnicode(int code) Returns the Unicode character sequence which corresponds to the given character code.
String	toUnicode(int code, GlyphList customGlyphList) Returns the Unicode character sequence which corresponds to the given character code.
abstract boolean	willBeSubset() Returns true if this font will be subset when embedded.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.pdfbox.pdmodel.font.PDFontLike

getBoundingBox, getHeight, getName, getWidthFromFont, hasExplicitWidth, isDamaged, isEmbedded

Field Detail

DEFAULT_FONT_MATRIX

protected static final Matrix DEFAULT_FONT_MATRIX

dict

protected final COSDictionary dict

Constructor Detail

PDFont

protected PDFont(COSDictionary fontDictionary)
          throws IOException

Constructor.

Parameters:

fontDictionary - Font dictionary.

Throws:

IOException

Method Detail

getStandard14AFM

protected final org.apache.fontbox.afm.FontMetrics getStandard14AFM()

Returns the AFM if this is a Standard 14 font.

getFontDescriptor

public PDFontDescriptor getFontDescriptor()

Description copied from interface: PDFontLike

Returns the font descriptor, may be null.

Specified by:

getFontDescriptor in interface PDFontLike

setFontDescriptor

protected final void setFontDescriptor(PDFontDescriptor fontDescriptor)

Sets the font descriptor when embedding a font.

readCMap

protected final org.apache.fontbox.cmap.CMap readCMap(COSBase base)
                                               throws IOException

Reads a CMap given a COS Stream or Name. May return null if a predefined CMap does not exist.

Parameters:

base - COSName or COSStream

Throws:

IOException

getCOSObject

public COSDictionary getCOSObject()

Description copied from interface: COSObjectable

Convert this standard java object to a COS object.

Specified by:

getCOSObject in interface COSObjectable

Returns:

The cos object that matches this Java object.

getPositionVector

public Vector getPositionVector(int code)

Description copied from interface: PDFontLike

Returns the position vector (v), in text space, for the given character. This represents the position of vertical origin relative to horizontal origin, for horizontal writing it will always be (0, 0). For vertical writing both x and y are set.

Specified by:

getPositionVector in interface PDFontLike

Parameters:

code - character code

Returns:

position vector

getDisplacement

public Vector getDisplacement(int code)
                       throws IOException

Returns the displacement vector (w0, w1) in text space, for the given character. For horizontal text only the x component is used, for vertical text only the y component.

Parameters:

code - character code

Returns:

displacement vector

Throws:

IOException

getWidth

public float getWidth(int code)
               throws IOException

Description copied from interface: PDFontLike

Returns the advance width of the given character, in glyph space.

If you want the visual bounds of the glyph then call getPath(..) on the appropriate PDFont subclass to retrieve the glyph outline as a GeneralPath instead. See the cyan rectangles in the DrawPrintTextLocations.java example to see this in action.

Specified by:

getWidth in interface PDFontLike

Parameters:

code - character code

Throws:

IOException

getStandard14Width

protected abstract float getStandard14Width(int code)

Returns the glyph width from the AFM if this is a Standard 14 font.

Parameters:

code - character code

Returns:

width in 1/1000 text space

encode

public final byte[] encode(String text)
                    throws IOException

Encodes the given string for use in a PDF content stream.

Parameters:

text - Any Unicode text.

Returns:

Array of PDF content stream bytes.

Throws:

IOException - If the text could not be encoded.

IllegalArgumentException - if a character isn't supported by the font.

encode

protected abstract byte[] encode(int unicode)
                          throws IOException

Encodes the given Unicode code point for use in a PDF content stream. Content streams use a multi-byte encoding with 1 to 4 bytes.

This method is called when embedding text in PDFs and when filling in fields.

Parameters:

unicode - Unicode code point.

Returns:

Array of 1 to 4 PDF content stream bytes.

Throws:

IOException - If the text could not be encoded.

IllegalArgumentException - if a character isn't supported by the font.

getStringWidth

public float getStringWidth(String text)
                     throws IOException

Returns the width of the given Unicode string.

Parameters:

text - The text to get the width of.

Returns:

The width of the string in 1/1000 units of text space.

Throws:

IOException - If there is an error getting the width information.

IllegalArgumentException - if a character isn't supported by the font.

getAverageFontWidth

public float getAverageFontWidth()

This will get the average font width for all characters.

Specified by:

getAverageFontWidth in interface PDFontLike

Returns:

The width is in 1000 unit of text space, ie 333 or 777

readCode

public abstract int readCode(InputStream in)
                      throws IOException

Reads a character code from a content stream string. Codes may be up to 4 bytes long.

Parameters:

in - string stream

Returns:

character code

Throws:

IOException - if the CMap or stream cannot be read

toUnicode

public String toUnicode(int code,
                        GlyphList customGlyphList)
                 throws IOException

Returns the Unicode character sequence which corresponds to the given character code.

Parameters:

code - character code

customGlyphList - a custom glyph list to use instead of the Adobe Glyph List

Returns:

Unicode character(s)

Throws:

IOException

toUnicode

public String toUnicode(int code)
                 throws IOException

Returns the Unicode character sequence which corresponds to the given character code.

Parameters:

code - character code

Returns:

Unicode character(s)

Throws:

IOException

getType

public String getType()

This will always return "Font" for fonts.

Returns:

The type of object that this is.

getSubType

public String getSubType()

This will get the subtype of font.

getWidths

protected final List<Float> getWidths()

The widths of the characters. This will be null for the standard 14 fonts.

Returns:

The widths of the characters.

getFontMatrix

public Matrix getFontMatrix()

Description copied from interface: PDFontLike

Returns the font matrix, which represents the transformation from glyph space to text space.

Specified by:

getFontMatrix in interface PDFontLike

getSpaceWidth

public float getSpaceWidth()

Determines the width of the space character. This is very important for text extraction.

Returns:

the width of the space character

isVertical

public abstract boolean isVertical()

Returns true if the font uses vertical writing mode.

isStandard14

public boolean isStandard14()

Returns true if this font is one of the "Standard 14" fonts and receives special handling.

addToSubset

public abstract void addToSubset(int codePoint)

Adds the given Unicode point to the subset.

Parameters:

codePoint - Unicode code point

subset

public abstract void subset()
                     throws IOException

Replaces this font with a subset containing only the given Unicode characters.

Throws:

IOException - if the subset could not be written

willBeSubset

public abstract boolean willBeSubset()

Returns true if this font will be subset when embedded.

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

getToUnicodeCMap

protected org.apache.fontbox.cmap.CMap getToUnicodeCMap()

Get the /ToUnicode CMap.

Returns:

The /ToUnicode CMap or null if there is none.