org.apache.pdfbox.pdmodel.font
Class PDFont

java.lang.Object
  org.apache.pdfbox.pdmodel.font.PDFont

All Implemented Interfaces:

COSObjectable

Direct Known Subclasses:

PDSimpleFont

public abstract class PDFont
extends Object
implements COSObjectable

This is the base class for all PDF fonts.

Version:

$Revision: 1.46 $

Author:

Ben Litchfield

Field Summary

protected CMap	cmap This is only used if this is a font object and it has an encoding and it is a type0 font with a cmap.
protected static Map<String,CMap>	cmapObjects
protected COSDictionary	font The cos dictionary for this font.
protected PDMatrix	fontMatrix The font matrix.
protected static String	resourceRootCMAP
protected CMap	toUnicodeCmap The CMap holding the ToUnicode mapping

Constructor Summary

PDFont()
Constructor.

PDFont(COSDictionary fontDictionary)
Constructor.

Method Summary

static void	clearResources() This will clear AFM resources that are stored statically.
protected String	cmapEncoding(int code, int length, boolean isCIDFont, CMap sourceCmap) Encode the given value using the CMap of the font.
protected abstract void	determineEncoding() Determines the encoding for the font.
void	drawString(String string, Graphics g, float fontSize, AffineTransform at, float x, float y) Deprecated. use drawString(String, int[], Graphics, float, AffineTransform, float, float) instead
abstract void	drawString(String string, int[] codePoints, Graphics g, float fontSize, AffineTransform at, float x, float y) This will draw a string on a canvas using the font.
String	encode(byte[] c, int offset, int length) This will perform the encoding of a character if needed.
int	encodeToCID(byte[] c, int offset, int length)
boolean	equals(Object other)
protected FontMetric	getAFM() This will get an AFM object if one exists.
abstract float	getAverageFontWidth() This will get the average font width for all characters.
protected float	getAverageFontWidthFromAFMFile() This will attempt to get the average font width from an AFM file.
String	getBaseFont() The PostScript name of the font.
int	getCodeFromArray(byte[] data, int offset, int length) Used for multibyte encodings.
COSBase	getCOSObject() Convert this standard java object to a COS object.
protected COSBase	getEncoding() cache the COSName.ENCODING object from the font's dictionary since it is called so often.
int	getFirstChar() The code for the first char or -1 if there is none.
abstract PDRectangle	getFontBoundingBox() This will get the fonts bounding box.
PDFontDescriptor	getFontDescriptor() This will get the font descriptor for this font.
Encoding	getFontEncoding() This will get or create the encoder.
abstract float	getFontHeight(byte[] c, int offset, int length) This will get the font width for a character.
PDMatrix	getFontMatrix() This will get the matrix that is used to transform glyph space to text space.
abstract float	getFontWidth(byte[] c, int offset, int length) This will get the font width for a character.
float	getFontWidth(int charCode) Determines the width of the given character.
protected float	getFontWidthFromAFMFile(int code) This will attempt to get the font width from an AFM file.
int	getLastChar() The code for the last char or -1 if there is none.
float	getStringWidth(String string) This will get the width of this string for this font.
String	getSubType() This will get the subtype of font, Type1, Type3, ...
String	getType() This will always return "Font" for fonts.
List<Float>	getWidths() The widths of the characters.
int	hashCode()
protected boolean	hasToUnicode() Determines if a font as a ToUnicode entry.
protected boolean	isType0Font() Determines if the font is a type 0 font.
protected boolean	isType1Font() Determines if the font is a type 1 font.
protected CMap	parseCmap(String cmapRoot, InputStream cmapStream)
void	setBaseFont(String baseFont) Set the PostScript name of the font.
protected void	setEncoding(COSBase encodingValue) Set the encoding object from the fonts dictionary.
void	setFirstChar(int firstChar) Set the first character this font supports.
void	setFontDescriptor(PDFontDescriptorDictionary fdDictionary) This will set the font descriptor.
void	setFontEncoding(Encoding enc) The will set the encoding for this font.
protected void	setHasToUnicode(boolean hasToUnicodeValue) Sets hasToUnicode to the given value.
void	setLastChar(int lastChar) Set the last character this font supports.
void	setWidths(List<Float> widthsList) Set the widths of the characters code.

Methods inherited from class java.lang.Object

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

Field Detail

font

protected COSDictionary font

The cos dictionary for this font.

fontMatrix

protected PDMatrix fontMatrix

The font matrix.

cmap

protected CMap cmap

This is only used if this is a font object and it has an encoding and it is a type0 font with a cmap.

toUnicodeCmap

protected CMap toUnicodeCmap

The CMap holding the ToUnicode mapping

cmapObjects

protected static Map<String,CMap> cmapObjects

resourceRootCMAP

protected static final String resourceRootCMAP

See Also:

Constant Field Values

Constructor Detail

PDFont

public PDFont()

Constructor.

PDFont

public PDFont(COSDictionary fontDictionary)

Constructor.

Parameters:

fontDictionary - The font dictionary according to the PDF specification.

Method Detail

clearResources

public static void clearResources()

This will clear AFM resources that are stored statically. This is usually not a problem unless you want to reclaim resources for a long running process. SPECIAL NOTE: The font calculations are currently in COSObject, which is where they will reside until PDFont is mature enough to take them over. PDFont is the appropriate place for them and not in COSObject but we need font calculations for text extraction. THIS METHOD WILL BE MOVED OR REMOVED TO ANOTHER LOCATION IN A FUTURE VERSION OF PDFBOX.

getFontDescriptor

public PDFontDescriptor getFontDescriptor()

This will get the font descriptor for this font.

Returns:

The font descriptor for this font.

setFontDescriptor

public void setFontDescriptor(PDFontDescriptorDictionary fdDictionary)

This will set the font descriptor.

Parameters:

fdDictionary - The font descriptor.

determineEncoding

protected abstract void determineEncoding()

Determines the encoding for the font. This method as to be overwritten, as there are different possibilities to define a mapping.

getCOSObject

public COSBase getCOSObject()

Convert this standard java object to a COS object.

Specified by:

getCOSObject in interface COSObjectable

Returns:

The cos object that matches this Java object.

getFontWidth

public abstract float getFontWidth(byte[] c,
                                   int offset,
                                   int length)
                            throws IOException

This will get the font width for a character.

Parameters:

c - The character code to get the width for.

offset - The offset into the array.

length - The length of the data.

Returns:

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

Throws:

IOException - If an error occurs while parsing.

getFontHeight

public abstract float getFontHeight(byte[] c,
                                    int offset,
                                    int length)
                             throws IOException

This will get the font width for a character.

Parameters:

c - The character code to get the width for.

offset - The offset into the array.

length - The length of the data.

Returns:

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

Throws:

IOException - If an error occurs while parsing.

getStringWidth

public float getStringWidth(String string)
                     throws IOException

This will get the width of this string for this font.

Parameters:

string - The string to get the width of.

Returns:

The width of the string in 1000 units of text space, ie 333 567...

Throws:

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

getAverageFontWidth

public abstract float getAverageFontWidth()
                                   throws IOException

This will get the average font width for all characters.

Returns:

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

Throws:

IOException - If an error occurs while parsing.

drawString

public void drawString(String string,
                       Graphics g,
                       float fontSize,
                       AffineTransform at,
                       float x,
                       float y)
                throws IOException

Deprecated. use drawString(String, int[], Graphics, float, AffineTransform, float, float) instead

This will draw a string on a canvas using the font.

Parameters:

string - The string to draw.

g - The graphics to draw onto.

fontSize - The size of the font to draw.

at - The transformation matrix with all information for scaling and shearing of the font.

x - The x coordinate to draw at.

y - The y coordinate to draw at.

Throws:

IOException - If there is an error drawing the specific string.

drawString

public abstract void drawString(String string,
                                int[] codePoints,
                                Graphics g,
                                float fontSize,
                                AffineTransform at,
                                float x,
                                float y)
                         throws IOException

This will draw a string on a canvas using the font.

Parameters:

string - The string to draw.

codePoints - The codePoints of the given string.

g - The graphics to draw onto.

fontSize - The size of the font to draw.

at - The transformation matrix with all information for scaling and shearing of the font.

x - The x coordinate to draw at.

y - The y coordinate to draw at.

Throws:

IOException - If there is an error drawing the specific string.

getCodeFromArray

public int getCodeFromArray(byte[] data,
                            int offset,
                            int length)

Used for multibyte encodings.

Parameters:

data - The array of data.

offset - The offset into the array.

length - The number of bytes to use.

Returns:

The int value of data from the array.

getFontWidthFromAFMFile

protected float getFontWidthFromAFMFile(int code)
                                 throws IOException

This will attempt to get the font width from an AFM file.

Parameters:

code - The character code we are trying to get.

Returns:

The font width from the AFM file.

Throws:

IOException - if we cannot find the width.

getAverageFontWidthFromAFMFile

protected float getAverageFontWidthFromAFMFile()
                                        throws IOException

This will attempt to get the average font width from an AFM file.

Returns:

The average font width from the AFM file.

Throws:

IOException - if we cannot find the width.

getAFM

protected FontMetric getAFM()

This will get an AFM object if one exists.

Returns:

The afm object from the name.

getEncoding

protected COSBase getEncoding()

cache the COSName.ENCODING object from the font's dictionary since it is called so often.

Use this method instead of

   font.getDictionaryObject(COSName.ENCODING);
 

Returns:

the encoding

setEncoding

protected void setEncoding(COSBase encodingValue)

Set the encoding object from the fonts dictionary.

Parameters:

encoding - the given encoding.

cmapEncoding

protected String cmapEncoding(int code,
                              int length,
                              boolean isCIDFont,
                              CMap sourceCmap)
                       throws IOException

Encode the given value using the CMap of the font.

Parameters:

code - the code to encode.

length - the byte length of the given code.

isCIDFont - indicates that the used font is a CID font.

Returns:

The value of the encoded character.

Throws:

IOException - if something went wrong

encode

public String encode(byte[] c,
                     int offset,
                     int length)
              throws IOException

This will perform the encoding of a character if needed.

Parameters:

c - The character to encode.

offset - The offset into the array to get the data

length - The number of bytes to read.

Returns:

The value of the encoded character.

Throws:

IOException - If there is an error during the encoding.

encodeToCID

public int encodeToCID(byte[] c,
                       int offset,
                       int length)
                throws IOException

Throws:

IOException

parseCmap

protected CMap parseCmap(String cmapRoot,
                         InputStream cmapStream)

setFontEncoding

public void setFontEncoding(Encoding enc)

The will set the encoding for this font.

Parameters:

enc - The font encoding.

getFontEncoding

public Encoding getFontEncoding()

This will get or create the encoder.

Returns:

The encoding to use.

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, Type1, Type3, ...

Returns:

The type of font that this is.

isType1Font

protected boolean isType1Font()

Determines if the font is a type 1 font.

Returns:

returns true if the font is a type 1 font

isType0Font

protected boolean isType0Font()

Determines if the font is a type 0 font.

Returns:

returns true if the font is a type 0 font

getBaseFont

public String getBaseFont()

The PostScript name of the font.

Returns:

The postscript name of the font.

setBaseFont

public void setBaseFont(String baseFont)

Set the PostScript name of the font.

Parameters:

baseFont - The postscript name for the font.

getFirstChar

public int getFirstChar()

The code for the first char or -1 if there is none.

Returns:

The code for the first character.

setFirstChar

public void setFirstChar(int firstChar)

Set the first character this font supports.

Parameters:

firstChar - The first character.

getLastChar

public int getLastChar()

The code for the last char or -1 if there is none.

Returns:

The code for the last character.

setLastChar

public void setLastChar(int lastChar)

Set the last character this font supports.

Parameters:

lastChar - The last character.

getWidths

public List<Float> getWidths()

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

Returns:

The widths of the characters.

setWidths

public void setWidths(List<Float> widthsList)

Set the widths of the characters code.

Parameters:

widths - The widths of the character codes.

getFontMatrix

public PDMatrix getFontMatrix()

This will get the matrix that is used to transform glyph space to text space. By default there are 1000 glyph units to 1 text space unit, but type3 fonts can use any value. Note:If this is a type3 font then it can be modified via the PDType3Font.setFontMatrix, otherwise this is a read-only property.

Returns:

The matrix to transform from glyph space to text space.

getFontBoundingBox

public abstract PDRectangle getFontBoundingBox()
                                        throws IOException

This will get the fonts bounding box.

Returns:

The fonts bounding box.

Throws:

IOException - If there is an error getting the bounding box.

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getFontWidth

public float getFontWidth(int charCode)

Determines the width of the given character.

Parameters:

charCode - the code of the given character

Returns:

the width of the character

hasToUnicode

protected boolean hasToUnicode()

Determines if a font as a ToUnicode entry.

Returns:

true if the font has a ToUnicode entry

setHasToUnicode

protected void setHasToUnicode(boolean hasToUnicodeValue)

Sets hasToUnicode to the given value.

Parameters:

hasToUnicode - the given value for hasToUnicode