278 lines
11 KiB
C#
278 lines
11 KiB
C#
using System;
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using System.Collections;
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using System.util;
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using iTextSharp.text;
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/*
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* $Id: FontDetails.cs,v 1.7 2008/05/13 11:25:17 psoares33 Exp $
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*
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*
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* Copyright 2001, 2002 by Paulo Soares.
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf {
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/** Each font in the document will have an instance of this class
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* where the characters used will be represented.
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*
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* @author Paulo Soares (psoares@consiste.pt)
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*/
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internal class FontDetails {
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/** The indirect reference to this font
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*/
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PdfIndirectReference indirectReference;
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/** The font name that appears in the document body stream
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*/
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PdfName fontName;
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/** The font
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*/
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BaseFont baseFont;
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/** The font if its an instance of <CODE>TrueTypeFontUnicode</CODE>
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*/
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TrueTypeFontUnicode ttu;
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CJKFont cjkFont;
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/** The array used with single byte encodings
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*/
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byte[] shortTag;
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/** The map used with double byte encodings. The key is Int(glyph) and the
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* value is int[]{glyph, width, Unicode code}
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*/
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Hashtable longTag;
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IntHashtable cjkTag;
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/** The font type
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*/
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int fontType;
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/** <CODE>true</CODE> if the font is symbolic
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*/
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bool symbolic;
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/** Indicates if all the glyphs and widths for that particular
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* encoding should be included in the document.
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*/
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protected bool subset = true;
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/** Each font used in a document has an instance of this class.
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* This class stores the characters used in the document and other
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* specifics unique to the current working document.
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* @param fontName the font name
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* @param indirectReference the indirect reference to the font
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* @param baseFont the <CODE>BaseFont</CODE>
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*/
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internal FontDetails(PdfName fontName, PdfIndirectReference indirectReference, BaseFont baseFont) {
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this.fontName = fontName;
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this.indirectReference = indirectReference;
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this.baseFont = baseFont;
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fontType = baseFont.FontType;
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switch (fontType) {
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case BaseFont.FONT_TYPE_T1:
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case BaseFont.FONT_TYPE_TT:
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shortTag = new byte[256];
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break;
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case BaseFont.FONT_TYPE_CJK:
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cjkTag = new IntHashtable();
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cjkFont = (CJKFont)baseFont;
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break;
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case BaseFont.FONT_TYPE_TTUNI:
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longTag = new Hashtable();
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ttu = (TrueTypeFontUnicode)baseFont;
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symbolic = baseFont.IsFontSpecific();
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break;
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}
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}
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/** Gets the indirect reference to this font.
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* @return the indirect reference to this font
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*/
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internal PdfIndirectReference IndirectReference {
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get {
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return indirectReference;
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}
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}
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/** Gets the font name as it appears in the document body.
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* @return the font name
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*/
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internal PdfName FontName {
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get {
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return fontName;
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}
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}
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/** Gets the <CODE>BaseFont</CODE> of this font.
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* @return the <CODE>BaseFont</CODE> of this font
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*/
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internal BaseFont BaseFont {
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get {
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return baseFont;
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}
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}
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/** Converts the text into bytes to be placed in the document.
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* The conversion is done according to the font and the encoding and the characters
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* used are stored.
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* @param text the text to convert
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* @return the conversion
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*/
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internal byte[] ConvertToBytes(string text) {
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byte[] b = null;
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switch (fontType) {
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case BaseFont.FONT_TYPE_T3:
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return baseFont.ConvertToBytes(text);
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case BaseFont.FONT_TYPE_T1:
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case BaseFont.FONT_TYPE_TT: {
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b = baseFont.ConvertToBytes(text);
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int len = b.Length;
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for (int k = 0; k < len; ++k)
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shortTag[((int)b[k]) & 0xff] = 1;
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break;
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}
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case BaseFont.FONT_TYPE_CJK: {
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int len = text.Length;
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for (int k = 0; k < len; ++k)
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cjkTag[cjkFont.GetCidCode(text[k])] = 0;
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b = baseFont.ConvertToBytes(text);
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break;
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}
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case BaseFont.FONT_TYPE_DOCUMENT: {
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b = baseFont.ConvertToBytes(text);
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break;
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}
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case BaseFont.FONT_TYPE_TTUNI: {
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int len = text.Length;
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int[] metrics = null;
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char[] glyph = new char[len];
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int i = 0;
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if (symbolic) {
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b = PdfEncodings.ConvertToBytes(text, "symboltt");
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len = b.Length;
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for (int k = 0; k < len; ++k) {
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metrics = ttu.GetMetricsTT(b[k] & 0xff);
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if (metrics == null)
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continue;
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longTag[metrics[0]] = new int[]{metrics[0], metrics[1], ttu.GetUnicodeDifferences(b[k] & 0xff)};
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glyph[i++] = (char)metrics[0];
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}
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}
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else {
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for (int k = 0; k < len; ++k) {
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int val;
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if (Utilities.IsSurrogatePair(text, k)) {
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val = Utilities.ConvertToUtf32(text, k);
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k++;
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}
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else {
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val = (int)text[k];
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}
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metrics = ttu.GetMetricsTT(val);
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if (metrics == null)
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continue;
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int m0 = metrics[0];
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int gl = m0;
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if (!longTag.ContainsKey(gl))
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longTag[gl] = new int[]{m0, metrics[1], val};
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glyph[i++] = (char)m0;
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}
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}
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string s = new String(glyph, 0, i);
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b = PdfEncodings.ConvertToBytes(s, CJKFont.CJK_ENCODING);
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break;
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}
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}
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return b;
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}
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/** Writes the font definition to the document.
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* @param writer the <CODE>PdfWriter</CODE> of this document
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*/
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internal void WriteFont(PdfWriter writer) {
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switch (fontType) {
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case BaseFont.FONT_TYPE_T3:
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baseFont.WriteFont(writer, indirectReference, null);
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break;
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case BaseFont.FONT_TYPE_T1:
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case BaseFont.FONT_TYPE_TT: {
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int firstChar;
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int lastChar;
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for (firstChar = 0; firstChar < 256; ++firstChar) {
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if (shortTag[firstChar] != 0)
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break;
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}
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for (lastChar = 255; lastChar >= firstChar; --lastChar) {
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if (shortTag[lastChar] != 0)
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break;
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}
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if (firstChar > 255) {
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firstChar = 255;
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lastChar = 255;
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}
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baseFont.WriteFont(writer, indirectReference, new Object[]{firstChar, lastChar, shortTag, subset});
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break;
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}
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case BaseFont.FONT_TYPE_CJK:
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baseFont.WriteFont(writer, indirectReference, new Object[]{cjkTag});
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break;
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case BaseFont.FONT_TYPE_TTUNI:
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baseFont.WriteFont(writer, indirectReference, new Object[]{longTag, subset});
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break;
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}
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}
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/** Indicates if all the glyphs and widths for that particular
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* encoding should be included in the document. Set to <CODE>false</CODE>
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* to include all.
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* @param subset new value of property subset
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*/
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public bool Subset {
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set {
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this.subset = value;
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}
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get {
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return subset;
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}
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}
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}
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} |