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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.kernel.font;
import com.itextpdf.io.font.FontProgram;
import com.itextpdf.io.font.otf.Glyph;
import com.itextpdf.io.font.otf.GlyphLine;
import com.itextpdf.io.util.TextUtil;
import com.itextpdf.kernel.exceptions.KernelExceptionMessageConstant;
import com.itextpdf.kernel.exceptions.PdfException;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfNumber;
import com.itextpdf.kernel.pdf.PdfObject;
import com.itextpdf.kernel.pdf.PdfObjectWrapper;
import com.itextpdf.kernel.pdf.PdfOutputStream;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.PdfString;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public abstract class PdfFont extends PdfObjectWrapper {
/**
* The upper bound value for char code. As for simple fonts char codes are a single byte values,
* it may vary from 0 to 255.
*/
public static final int SIMPLE_FONT_MAX_CHAR_CODE_VALUE = 255;
protected FontProgram fontProgram;
protected static final byte[] EMPTY_BYTES = new byte[0];
protected Map notdefGlyphs = new HashMap<>();
/**
* false, if the font comes from PdfDocument.
*/
protected boolean newFont = true;
/**
* true if the font is to be embedded in the PDF.
*/
protected boolean embedded = false;
/**
* Indicates if all the glyphs and widths for that particular encoding should be included in the document.
*/
protected boolean subset = true;
protected List subsetRanges;
protected PdfFont(PdfDictionary fontDictionary) {
super(fontDictionary);
getPdfObject().put(PdfName.Type, PdfName.Font);
}
protected PdfFont() {
super(new PdfDictionary());
getPdfObject().put(PdfName.Type, PdfName.Font);
}
/**
* Get glyph by unicode
*
* @param unicode a unicode code point
*
* @return {@link Glyph} if it exists or .NOTDEF if supported, otherwise {@code null}.
*/
public abstract Glyph getGlyph(int unicode);
/**
* Check whether font contains glyph with specified unicode.
*
* @param unicode a unicode code point
*
* @return true if font contains glyph, represented with the unicode code point,
* otherwise false.
*/
public boolean containsGlyph(int unicode) {
Glyph glyph = getGlyph(unicode);
if (glyph != null) {
if (getFontProgram() != null && getFontProgram().isFontSpecific()) {
//if current is symbolic, zero code is valid value
return glyph.getCode() > -1;
} else {
return glyph.getCode() > 0;
}
} else {
return false;
}
}
public abstract GlyphLine createGlyphLine(String content);
/**
* Append all supported glyphs and return number of processed chars.
* Composite font supports surrogate pairs.
*
* @param text String to convert to glyphs.
* @param from from index of the text.
* @param to to index of the text.
* @param glyphs array for a new glyphs, shall not be null.
*
* @return number of processed chars from text.
*/
public abstract int appendGlyphs(String text, int from, int to, List glyphs);
/**
* Append any single glyph, even notdef.
* Returns number of processed chars: 2 in case surrogate pair, otherwise 1.
*
* @param text String to convert to glyphs.
* @param from from index of the text.
* @param glyphs array for a new glyph, shall not be null.
*
* @return number of processed chars: 2 in case surrogate pair, otherwise 1
*/
public abstract int appendAnyGlyph(String text, int from, List glyphs);
/**
* Converts the text into bytes to be placed in the document.
* The conversion is done according to the font and the encoding and the characters
* used are stored.
*
* @param text the text to convert
*
* @return the conversion
*/
public abstract byte[] convertToBytes(String text);
public abstract byte[] convertToBytes(GlyphLine glyphLine);
public abstract String decode(PdfString content);
/**
* Decodes sequence of character codes (e.g. from content stream) into a {@link GlyphLine}
*
* @param characterCodes the string which is interpreted as a sequence of character codes. Note, that {@link
* PdfString} acts as a storage for char code values specific to given font, therefore
* individual character codes must not be interpreted as code units of the UTF-16 encoding
*
* @return the {@link GlyphLine} containing the glyphs encoded by the passed string
*/
public abstract GlyphLine decodeIntoGlyphLine(PdfString characterCodes);
/**
* Decodes sequence of character codes (e.g. from content stream) to sequence of glyphs
* and appends them to the passed list.
*
* @param list the list to the end of which decoded glyphs are to be added
* @param characterCodes the string which is interpreted as a sequence of character codes. Note, that {@link
* PdfString} acts as a storage for char code values specific to given font, therefore
* individual character codes must not be interpreted as code units of the UTF-16 encoding
*
* @return true if all codes where successfully decoded, false otherwise
*/
public boolean appendDecodedCodesToGlyphsList(List list, PdfString characterCodes) {
return false;
}
public abstract float getContentWidth(PdfString content);
public abstract byte[] convertToBytes(Glyph glyph);
public abstract void writeText(GlyphLine text, int from, int to, PdfOutputStream stream);
public abstract void writeText(String text, PdfOutputStream stream);
/**
* Returns the width of a certain character of this font in 1000 normalized units.
*
* @param unicode a certain character.
*
* @return a width in Text Space.
*/
public int getWidth(int unicode) {
Glyph glyph = getGlyph(unicode);
return glyph != null ? glyph.getWidth() : 0;
}
/**
* Returns the width of a certain character of this font in points.
*
* @param unicode a certain character.
* @param fontSize the font size.
*
* @return a width in points.
*/
public float getWidth(int unicode, float fontSize) {
return FontProgram.convertTextSpaceToGlyphSpace(getWidth(unicode) * fontSize);
}
/**
* Returns the width of a string of this font in 1000 normalized units.
*
* @param text a string content.
*
* @return a width of string in Text Space.
*/
public int getWidth(String text) {
int total = 0;
for (int i = 0; i < text.length(); i++) {
int ch;
if (TextUtil.isSurrogatePair(text, i)) {
ch = TextUtil.convertToUtf32(text, i);
i++;
} else {
ch = text.charAt(i);
}
Glyph glyph = getGlyph(ch);
if (glyph != null) {
total += glyph.getWidth();
}
}
return total;
}
/**
* Gets the width of a {@code String} in points.
*
* @param text the {@code String} to get the width of
* @param fontSize the font size
*
* @return the width in points
*/
public float getWidth(String text, float fontSize) {
return FontProgram.convertTextSpaceToGlyphSpace(getWidth(text) * fontSize);
}
/**
* Gets the descent of a {@code String} in points. The descent will always be
* less than or equal to zero even if all the characters have a higher descent.
*
* @param text the {@code String} to get the descent of
* @param fontSize the font size
*
* @return the descent in points
*/
public float getDescent(String text, float fontSize) {
int min = 0;
for (int k = 0; k < text.length(); ++k) {
int ch;
if (TextUtil.isSurrogatePair(text, k)) {
ch = TextUtil.convertToUtf32(text, k);
k++;
} else {
ch = text.charAt(k);
}
Glyph glyph = getGlyph(ch);
if (glyph != null) {
int[] bbox = glyph.getBbox();
if (bbox != null && bbox[1] < min) {
min = bbox[1];
} else if (bbox == null && getFontProgram().getFontMetrics().getTypoDescender() < min) {
min = getFontProgram().getFontMetrics().getTypoDescender();
}
}
}
return FontProgram.convertTextSpaceToGlyphSpace(min * fontSize);
}
/**
* Gets the descent of a char code in points. The descent will always be
* less than or equal to zero even if all the characters have a higher descent.
*
* @param unicode the char code to get the descent of
* @param fontSize the font size
*
* @return the descent in points
*/
public float getDescent(int unicode, float fontSize) {
int min = 0;
Glyph glyph = getGlyph(unicode);
if (glyph == null) {
return 0;
}
int[] bbox = glyph.getBbox();
if (bbox != null && bbox[1] < min) {
min = bbox[1];
} else if (bbox == null && getFontProgram().getFontMetrics().getTypoDescender() < min) {
min = getFontProgram().getFontMetrics().getTypoDescender();
}
return FontProgram.convertTextSpaceToGlyphSpace(min * fontSize);
}
/**
* Gets the ascent of a {@code String} in points. The ascent will always be
* greater than or equal to zero even if all the characters have a lower ascent.
*
* @param text the {@code String} to get the ascent of
* @param fontSize the font size
*
* @return the ascent in points
*/
public float getAscent(String text, float fontSize) {
int max = 0;
for (int k = 0; k < text.length(); ++k) {
int ch;
if (TextUtil.isSurrogatePair(text, k)) {
ch = TextUtil.convertToUtf32(text, k);
k++;
} else {
ch = text.charAt(k);
}
Glyph glyph = getGlyph(ch);
if (glyph != null) {
int[] bbox = glyph.getBbox();
if (bbox != null && bbox[3] > max) {
max = bbox[3];
} else if (bbox == null && getFontProgram().getFontMetrics().getTypoAscender() > max) {
max = getFontProgram().getFontMetrics().getTypoAscender();
}
}
}
return FontProgram.convertTextSpaceToGlyphSpace(max * fontSize);
}
/**
* Gets the ascent of a char code in normalized 1000 units. The ascent will always be
* greater than or equal to zero even if all the characters have a lower ascent.
*
* @param unicode the char code to get the ascent of
* @param fontSize the font size
*
* @return the ascent in points
*/
public float getAscent(int unicode, float fontSize) {
int max = 0;
Glyph glyph = getGlyph(unicode);
if (glyph == null) {
return 0;
}
int[] bbox = glyph.getBbox();
if (bbox != null && bbox[3] > max) {
max = bbox[3];
} else if (bbox == null && getFontProgram().getFontMetrics().getTypoAscender() > max) {
max = getFontProgram().getFontMetrics().getTypoAscender();
}
return FontProgram.convertTextSpaceToGlyphSpace(max * fontSize);
}
public FontProgram getFontProgram() {
return fontProgram;
}
public boolean isEmbedded() {
return embedded;
}
/**
* Indicates if all the glyphs and widths for that particular
* encoding should be included in the document.
*
* @return false to include all the glyphs and widths.
*/
public boolean isSubset() {
return subset;
}
/**
* Indicates if all the glyphs and widths for that particular
* encoding should be included in the document. When set to {@code true}
* only the glyphs used will be included in the font. When set to {@code false}
* the full font will be included and all subset ranges will be removed.
*
* @param subset new value of property subset
*
* @see #addSubsetRange(int[])
*/
public void setSubset(boolean subset) {
this.subset = subset;
}
/**
* Adds a character range when subsetting. The range is an int array
* where the first element is the start range inclusive and the second element is the
* end range inclusive. Several ranges are allowed in the same array.
* Note, #setSubset(true) will be called implicitly
* therefore this range is an addition to the used glyphs.
*
* @param range the character range
*/
public void addSubsetRange(int[] range) {
if (subsetRanges == null) {
subsetRanges = new ArrayList<>();
}
subsetRanges.add(range);
setSubset(true);
}
public List splitString(String text, float fontSize, float maxWidth) {
List resultString = new ArrayList<>();
int lastWhiteSpace = 0;
int startPos = 0;
float tokenLength = 0;
for (int i = 0; i < text.length(); i++) {
char ch = text.charAt(i);
if (Character.isWhitespace(ch)) {
lastWhiteSpace = i;
}
float currentCharWidth = getWidth(ch, fontSize);
if (tokenLength + currentCharWidth >= maxWidth || ch == '\n') {
if (startPos < lastWhiteSpace) {
resultString.add(text.substring(startPos, lastWhiteSpace));
startPos = lastWhiteSpace + 1;
tokenLength = 0;
i = lastWhiteSpace;
} else if (startPos != i) {
resultString.add(text.substring(startPos, i));
startPos = i;
tokenLength = currentCharWidth;
} else {
resultString.add(text.substring(startPos, startPos + 1));
startPos = i + 1;
tokenLength = 0;
}
} else {
tokenLength += currentCharWidth;
}
}
resultString.add(text.substring(startPos));
return resultString;
}
/**
* Checks whether the {@link PdfFont} was built with corresponding fontProgram and encoding or CMAP.
* Default value is false unless overridden.
*
* @param fontProgram a font name or path to a font program
* @param encoding an encoding or CMAP
*
* @return true, if the PdfFont was built with the fontProgram and encoding. Otherwise false.
*
* @see PdfDocument#findFont(String, String)
* @see FontProgram#isBuiltWith(String)
* @see com.itextpdf.io.font.FontEncoding#isBuiltWith(String)
* @see com.itextpdf.io.font.CMapEncoding#isBuiltWith(String)
*/
public boolean isBuiltWith(String fontProgram, String encoding) {
return false;
}
/**
* To manually flush a {@code PdfObject} behind this wrapper, you have to ensure
* that this object is added to the document, i.e. it has an indirect reference.
* Basically this means that before flushing you need to explicitly call {@link #makeIndirect(PdfDocument)}.
* For example: wrapperInstance.makeIndirect(document).flush();
* Note that not every wrapper require this, only those that have such warning in documentation.
*/
@Override
public void flush() {
super.flush();
}
protected abstract PdfDictionary getFontDescriptor(String fontName);
@Override
protected boolean isWrappedObjectMustBeIndirect() {
return true;
}
/**
* Adds a unique subset prefix to be added to the font name when the font is embedded and subsetted.
*
* @param fontName the original font name.
* @param isSubset denotes whether font in question is subsetted, i.e. only used symbols are kept in it.
* @param isEmbedded denotes whether font in question is embedded into the PDF document.
*
* @return the font name prefixed with subset if isSubset and isEmbedded are true,
* otherwise original font name is returned intact.
*/
protected static String updateSubsetPrefix(String fontName, boolean isSubset, boolean isEmbedded) {
if (isSubset && isEmbedded) {
return FontUtil.addRandomSubsetPrefixForFontName(fontName);
}
return fontName;
}
/**
* Create {@code PdfStream} based on {@code fontStreamBytes}.
*
* @param fontStreamBytes original font data, must be not null.
* @param fontStreamLengths array to generate {@code Length*} keys, must be not null.
*
* @return the PdfStream containing the font or {@code null}, if there is an error reading the font.
*
* @throws PdfException Method will throw exception if {@code fontStreamBytes} is {@code null}.
*/
protected PdfStream getPdfFontStream(byte[] fontStreamBytes, int[] fontStreamLengths) {
if (fontStreamBytes == null || fontStreamLengths == null) {
throw new PdfException(KernelExceptionMessageConstant.FONT_EMBEDDING_ISSUE);
}
PdfStream fontStream = new PdfStream(fontStreamBytes);
makeObjectIndirect(fontStream);
for (int k = 0; k < fontStreamLengths.length; ++k) {
fontStream.put(new PdfName("Length" + (k + 1)), new PdfNumber(fontStreamLengths[k]));
}
return fontStream;
}
/**
* Helper method for making an object indirect, if the object already is indirect.
* Useful for FontDescriptor and FontFile to make possible immediate flushing.
* If there is no PdfDocument, mark the object as {@code MUST_BE_INDIRECT}.
*
* @param obj an object to make indirect.
*
* @return if current object isn't indirect, returns {@code false}, otherwise {@code tree}
*/
boolean makeObjectIndirect(PdfObject obj) {
if (getPdfObject().getIndirectReference() != null) {
obj.makeIndirect(getPdfObject().getIndirectReference().getDocument());
return true;
} else {
markObjectAsIndirect(obj);
return false;
}
}
@Override
public String toString() {
return "PdfFont{" +
"fontProgram=" + fontProgram +
'}';
}
}
