Source Code Cross Referenced for CIDFontType2.java in  » PDF » PDF-Renderer » com » sun » pdfview » font » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » PDF » PDF Renderer » com.sun.pdfview.font 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: CIDFontType2.java,v 1.2 2007/12/20 18:33:31 rbair Exp $
003:         *
004:         * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
005:         * Santa Clara, California 95054, U.S.A. All rights reserved.
006:         *
007:         * This library is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU Lesser General Public
009:         * License as published by the Free Software Foundation; either
010:         * version 2.1 of the License, or (at your option) any later version.
011:         * 
012:         * This library is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         * Lesser General Public License for more details.
016:         * 
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this library; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
020:         */
021:
022:        package com.sun.pdfview.font;
023:
024:        import java.awt.geom.GeneralPath;
025:        import java.io.IOException;
026:        import java.nio.ByteBuffer;
027:        import java.util.HashMap;
028:        import java.util.Map;
029:
030:        import com.sun.pdfview.PDFObject;
031:
032:        /**
033:         * a font object derived from a CID font.
034:         *
035:         * @author Jonathan Kaplan
036:         */
037:        public class CIDFontType2 extends TTFFont {
038:            /**
039:             * The width of each glyph from the DW and W arrays
040:             */
041:            private Map widths;
042:
043:            /*
044:             * the default width
045:             */
046:            private int defaultWidth = 1000;
047:
048:            /** the CIDtoGID map, if any */
049:            private ByteBuffer cidToGidMap;
050:
051:            /**
052:             * create a new CIDFontType2 object based on the name of a built-in font
053:             * and the font descriptor
054:             * @param baseName the name of the font, from the PDF file
055:             * @param fontObj a dictionary that contains the DW (defaultWidth) and
056:             * W (width) parameters
057:             * @param descriptor a descriptor for the font
058:             */
059:            public CIDFontType2(String baseName, PDFObject fontObj,
060:                    PDFFontDescriptor descriptor) throws IOException {
061:                super (baseName, fontObj, descriptor);
062:
063:                parseWidths(fontObj);
064:
065:                // read the cid to gid map (optional)
066:                PDFObject mapObj = fontObj.getDictRef("CIDToGIDMap");
067:
068:                // only read the map if it is a stream (if it is a name, it
069:                // is "Identity" and can be ignored
070:                if (mapObj != null && (mapObj.getType() == PDFObject.STREAM)) {
071:                    cidToGidMap = mapObj.getStreamBuffer();
072:                }
073:            }
074:
075:            /** Parse the Widths array and DW object */
076:            private void parseWidths(PDFObject fontObj) throws IOException {
077:                // read the default width (otpional)
078:                PDFObject defaultWidthObj = fontObj.getDictRef("DW");
079:                if (defaultWidthObj != null) {
080:                    defaultWidth = defaultWidthObj.getIntValue();
081:                }
082:
083:                // read the widths table 
084:                PDFObject widthObj = fontObj.getDictRef("W");
085:                if (widthObj == null) {
086:                    return;
087:                }
088:
089:                // initialize the widths array
090:                widths = new HashMap();
091:
092:                // parse the width array
093:                PDFObject[] widthArray = widthObj.getArray();
094:
095:                /* an entry can be in one of two forms:
096:                 *   <startIndex> <endIndex> <value> or
097:                 *   <startIndex> [ array of values ]
098:                 * we use the entryIdx to differentitate between them
099:                 */
100:                int entryIdx = 0;
101:                int first = 0;
102:                int last = 0;
103:
104:                for (int i = 0; i < widthArray.length; i++) {
105:                    if (entryIdx == 0) {
106:                        // first value in an entry.  Just store it
107:                        first = widthArray[i].getIntValue();
108:                    } else if (entryIdx == 1) {
109:                        // second value -- is it an int or array?
110:                        if (widthArray[i].getType() == PDFObject.ARRAY) {
111:                            // add all the entries in the array to the width array
112:                            PDFObject[] entries = widthArray[i].getArray();
113:                            for (int c = 0; c < entries.length; c++) {
114:                                Character key = new Character(
115:                                        (char) (c + first));
116:
117:                                // value is width / default width
118:                                float value = entries[c].getIntValue();
119:                                widths.put(key, new Float(value));
120:                            }
121:                            // all done
122:                            entryIdx = -1;
123:                        } else {
124:                            last = widthArray[i].getIntValue();
125:                        }
126:                    } else {
127:                        // third value.  Set a range
128:                        int value = widthArray[i].getIntValue();
129:
130:                        // set the range
131:                        for (int c = first; c <= last; c++) {
132:                            widths.put(new Character((char) c),
133:                                    new Float(value));
134:                        }
135:
136:                        // all done
137:                        entryIdx = -1;
138:                    }
139:
140:                    entryIdx++;
141:                }
142:            }
143:
144:            /** Get the default width in text space */
145:            @Override
146:            public int getDefaultWidth() {
147:                return defaultWidth;
148:            }
149:
150:            /** Get the width of a given character */
151:            @Override
152:            public float getWidth(char code, String name) {
153:                Float w = (Float) widths.get(new Character(code));
154:                if (w == null) {
155:                    return 1f;
156:                }
157:
158:                return w.floatValue() / getDefaultWidth();
159:            }
160:
161:            /**
162:             * Get the outline of a character given the character code.  We
163:             * interpose here in order to avoid using the CMap of the font in
164:             * a CID mapped font.
165:             */
166:            @Override
167:            protected synchronized GeneralPath getOutline(char src, float width) {
168:                int glyphId = (int) (src & 0xffff);
169:
170:                // check if there is a cidToGidMap
171:                if (cidToGidMap != null) {
172:                    // read the map
173:                    glyphId = cidToGidMap.getChar(glyphId * 2);
174:                }
175:
176:                // call getOutline on the glyphId
177:                return getOutline(glyphId, width);
178:            }
179:        }
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