JDK8/Java8源码在线阅读
/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.font;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.IntBuffer;
import java.util.Locale;
import java.nio.charset.*;
/*
* A tt font has a CMAP table which is in turn made up of sub-tables which
* describe the char to glyph mapping in (possibly) multiple ways.
* CMAP subtables are described by 3 values.
* 1. Platform ID (eg 3=Microsoft, which is the id we look for in JDK)
* 2. Encoding (eg 0=symbol, 1=unicode)
* 3. TrueType subtable format (how the char->glyph mapping for the encoding
* is stored in the subtable). See the TrueType spec. Format 4 is required
* by MS in fonts for windows. Its uses segmented mapping to delta values.
* Most typically we see are (3,1,4) :
* CMAP Platform ID=3 is what we use.
* Encodings that are used in practice by JDK on Solaris are
* symbol (3,0)
* unicode (3,1)
* GBK (3,5) (note that solaris zh fonts report 3,4 but are really 3,5)
* The format for almost all subtables is 4. However the solaris (3,5)
* encodings are typically in format 2.
*/
abstract class CMap {
// static char WingDings_b2c[] = {
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0x2702, 0x2701, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0x2706, 0x2709, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x2707, 0x270d,
// 0xfffd, 0x270c, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0x2708, 0xfffd, 0xfffd, 0x2744, 0xfffd, 0x271e, 0xfffd,
// 0x2720, 0x2721, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0x2751, 0x2752, 0xfffd, 0xfffd, 0x2756, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0x2740, 0x273f, 0x275d, 0x275e, 0xfffd,
// 0xfffd, 0x2780, 0x2781, 0x2782, 0x2783, 0x2784, 0x2785, 0x2786,
// 0x2787, 0x2788, 0x2789, 0xfffd, 0x278a, 0x278b, 0x278c, 0x278d,
// 0x278e, 0x278f, 0x2790, 0x2791, 0x2792, 0x2793, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x274d, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x2736, 0x2734, 0xfffd, 0x2735,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x272a, 0x2730, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x27a5, 0xfffd, 0x27a6, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0x27a2, 0xfffd, 0xfffd, 0xfffd, 0x27b3, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0x27a1, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0x27a9, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0x2717, 0x2713, 0xfffd, 0xfffd, 0xfffd,
// };
// static char Symbols_b2c[] = {
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0x2200, 0xfffd, 0x2203, 0xfffd, 0xfffd, 0x220d,
// 0xfffd, 0xfffd, 0x2217, 0xfffd, 0xfffd, 0x2212, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0x2245, 0x0391, 0x0392, 0x03a7, 0x0394, 0x0395, 0x03a6, 0x0393,
// 0x0397, 0x0399, 0x03d1, 0x039a, 0x039b, 0x039c, 0x039d, 0x039f,
// 0x03a0, 0x0398, 0x03a1, 0x03a3, 0x03a4, 0x03a5, 0x03c2, 0x03a9,
// 0x039e, 0x03a8, 0x0396, 0xfffd, 0x2234, 0xfffd, 0x22a5, 0xfffd,
// 0xfffd, 0x03b1, 0x03b2, 0x03c7, 0x03b4, 0x03b5, 0x03c6, 0x03b3,
// 0x03b7, 0x03b9, 0x03d5, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03bf,
// 0x03c0, 0x03b8, 0x03c1, 0x03c3, 0x03c4, 0x03c5, 0x03d6, 0x03c9,
// 0x03be, 0x03c8, 0x03b6, 0xfffd, 0xfffd, 0xfffd, 0x223c, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0x03d2, 0xfffd, 0x2264, 0x2215, 0x221e, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0x2218, 0xfffd, 0xfffd, 0x2265, 0xfffd, 0x221d, 0xfffd, 0x2219,
// 0xfffd, 0x2260, 0x2261, 0x2248, 0x22ef, 0x2223, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x2297, 0x2295, 0x2205, 0x2229,
// 0x222a, 0x2283, 0x2287, 0x2284, 0x2282, 0x2286, 0x2208, 0x2209,
// 0xfffd, 0x2207, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x221a, 0x22c5,
// 0xfffd, 0x2227, 0x2228, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0x22c4, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0x2211, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0x222b, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
// };
static final short ShiftJISEncoding = 2;
static final short GBKEncoding = 3;
static final short Big5Encoding = 4;
static final short WansungEncoding = 5;
static final short JohabEncoding = 6;
static final short MSUnicodeSurrogateEncoding = 10;
static final char noSuchChar = (char)0xfffd;
static final int SHORTMASK = 0x0000ffff;
static final int INTMASK = 0xffffffff;
static final char[][] converterMaps = new char[7][];
/*
* Unicode->other encoding translation array. A pre-computed look up
* which can be shared across all fonts using that encoding.
* Using this saves running character coverters repeatedly.
*/
char[] xlat;
static CMap initialize(TrueTypeFont font) {
CMap cmap = null;
int offset, platformID, encodingID=-1;
int three0=0, three1=0, three2=0, three3=0, three4=0, three5=0,
three6=0, three10=0;
boolean threeStar = false;
ByteBuffer cmapBuffer = font.getTableBuffer(TrueTypeFont.cmapTag);
int cmapTableOffset = font.getTableSize(TrueTypeFont.cmapTag);
short numberSubTables = cmapBuffer.getShort(2);
/* locate the offsets of all 3,* (ie Microsoft platform) encodings */
for (int i=0; i<numberSubTables; i++) {
cmapBuffer.position(i * 8 + 4);
platformID = cmapBuffer.getShort();
if (platformID == 3) {
threeStar = true;
encodingID = cmapBuffer.getShort();
offset = cmapBuffer.getInt();
switch (encodingID) {
case 0: three0 = offset; break; // MS Symbol encoding
case 1: three1 = offset; break; // MS Unicode cmap
case 2: three2 = offset; break; // ShiftJIS cmap.
case 3: three3 = offset; break; // GBK cmap
case 4: three4 = offset; break; // Big 5 cmap
case 5: three5 = offset; break; // Wansung
case 6: three6 = offset; break; // Johab
case 10: three10 = offset; break; // MS Unicode surrogates
}
}
}
/* This defines the preference order for cmap subtables */
if (threeStar) {
if (three10 != 0) {
cmap = createCMap(cmapBuffer, three10, null);
}
else if (three0 != 0) {
/* The special case treatment of these fonts leads to
* anomalies where a user can view "wingdings" and "wingdings2"
* and the latter shows all its code points in the unicode
* private use area at 0xF000->0XF0FF and the former shows
* a scattered subset of its glyphs that are known mappings to
* unicode code points.
* The primary purpose of these mappings was to facilitate
* display of symbol chars etc in composite fonts, however
* this is not needed as all these code points are covered
* by Lucida Sans Regular.
* Commenting this out reduces the role of these two files
* (assuming that they continue to be used in font.properties)
* to just one of contributing to the overall composite
* font metrics, and also AWT can still access the fonts.
* Clients which explicitly accessed these fonts as names
* "Symbol" and "Wingdings" (ie as physical fonts) and
* expected to see a scattering of these characters will
* see them now as missing. How much of a problem is this?
* Perhaps we could still support this mapping just for
* "Symbol.ttf" but I suspect some users would prefer it
* to be mapped in to the Latin range as that is how
* the "symbol" font is used in native apps.
*/
// String name = font.platName.toLowerCase(Locale.ENGLISH);
// if (name.endsWith("symbol.ttf")) {
// cmap = createSymbolCMap(cmapBuffer, three0, Symbols_b2c);
// } else if (name.endsWith("wingding.ttf")) {
// cmap = createSymbolCMap(cmapBuffer, three0, WingDings_b2c);
// } else {
cmap = createCMap(cmapBuffer, three0, null);
// }
}
else if (three1 != 0) {
cmap = createCMap(cmapBuffer, three1, null);
}
else if (three2 != 0) {
cmap = createCMap(cmapBuffer, three2,
getConverterMap(ShiftJISEncoding));
}
else if (three3 != 0) {
cmap = createCMap(cmapBuffer, three3,
getConverterMap(GBKEncoding));
}
else if (three4 != 0) {
/* GB2312 TrueType fonts on Solaris have wrong encoding ID for
* cmap table, these fonts have EncodingID 4 which is Big5
* encoding according the TrueType spec, but actually the
* fonts are using gb2312 encoding, have to use this
* workaround to make Solaris zh_CN locale work. -sherman
*/
if (FontUtilities.isSolaris && font.platName != null &&
(font.platName.startsWith(
"/usr/openwin/lib/locale/zh_CN.EUC/X11/fonts/TrueType") ||
font.platName.startsWith(
"/usr/openwin/lib/locale/zh_CN/X11/fonts/TrueType") ||
font.platName.startsWith(
"/usr/openwin/lib/locale/zh/X11/fonts/TrueType"))) {
cmap = createCMap(cmapBuffer, three4,
getConverterMap(GBKEncoding));
}
else {
cmap = createCMap(cmapBuffer, three4,
getConverterMap(Big5Encoding));
}
}
else if (three5 != 0) {
cmap = createCMap(cmapBuffer, three5,
getConverterMap(WansungEncoding));
}
else if (three6 != 0) {
cmap = createCMap(cmapBuffer, three6,
getConverterMap(JohabEncoding));
}
} else {
/* No 3,* subtable was found. Just use whatever is the first
* table listed. Not very useful but maybe better than
* rejecting the font entirely?
*/
cmap = createCMap(cmapBuffer, cmapBuffer.getInt(8), null);
}
return cmap;
}
/* speed up the converting by setting the range for double
* byte characters;
*/
static char[] getConverter(short encodingID) {
int dBegin = 0x8000;
int dEnd = 0xffff;
String encoding;
switch (encodingID) {
case ShiftJISEncoding:
dBegin = 0x8140;
dEnd = 0xfcfc;
encoding = "SJIS";
break;
case GBKEncoding:
dBegin = 0x8140;
dEnd = 0xfea0;
encoding = "GBK";
break;
case Big5Encoding:
dBegin = 0xa140;
dEnd = 0xfefe;
encoding = "Big5";
break;
case WansungEncoding:
dBegin = 0xa1a1;
dEnd = 0xfede;
encoding = "EUC_KR";
break;
case JohabEncoding:
dBegin = 0x8141;
dEnd = 0xfdfe;
encoding = "Johab";
break;
default:
return null;
}
try {
char[] convertedChars = new char[65536];
for (int i=0; i<65536; i++) {
convertedChars[i] = noSuchChar;
}
byte[] inputBytes = new byte[(dEnd-dBegin+1)*2];
char[] outputChars = new char[(dEnd-dBegin+1)];
int j = 0;
int firstByte;
if (encodingID == ShiftJISEncoding) {
for (int i = dBegin; i <= dEnd; i++) {
firstByte = (i >> 8 & 0xff);
if (firstByte >= 0xa1 && firstByte <= 0xdf) {
//sjis halfwidth katakana
inputBytes[j++] = (byte)0xff;
inputBytes[j++] = (byte)0xff;
} else {
inputBytes[j++] = (byte)firstByte;
inputBytes[j++] = (byte)(i & 0xff);
}
}
} else {
for (int i = dBegin; i <= dEnd; i++) {
inputBytes[j++] = (byte)(i>>8 & 0xff);
inputBytes[j++] = (byte)(i & 0xff);
}
}
Charset.forName(encoding).newDecoder()
.onMalformedInput(CodingErrorAction.REPLACE)
.onUnmappableCharacter(CodingErrorAction.REPLACE)
.replaceWith("\u0000")
.decode(ByteBuffer.wrap(inputBytes, 0, inputBytes.length),
CharBuffer.wrap(outputChars, 0, outputChars.length),
true);
// ensure single byte ascii
for (int i = 0x20; i <= 0x7e; i++) {
convertedChars[i] = (char)i;
}
//sjis halfwidth katakana
if (encodingID == ShiftJISEncoding) {
for (int i = 0xa1; i <= 0xdf; i++) {
convertedChars[i] = (char)(i - 0xa1 + 0xff61);
}
}
/* It would save heap space (approx 60Kbytes for each of these
* converters) if stored only valid ranges (ie returned
* outputChars directly. But this is tricky since want to
* include the ASCII range too.
*/
// System.err.println("oc.len="+outputChars.length);
// System.err.println("cc.len="+convertedChars.length);
// System.err.println("dbegin="+dBegin);
System.arraycopy(outputChars, 0, convertedChars, dBegin,
outputChars.length);
//return convertedChars;
/* invert this map as now want it to map from Unicode
* to other encoding.
*/
char [] invertedChars = new char[65536];
for (int i=0;i<65536;i++) {
if (convertedChars[i] != noSuchChar) {
invertedChars[convertedChars[i]] = (char)i;
}
}
return invertedChars;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/*
* The returned array maps to unicode from some other 2 byte encoding
* eg for a 2byte index which represents a SJIS char, the indexed
* value is the corresponding unicode char.
*/
static char[] getConverterMap(short encodingID) {
if (converterMaps[encodingID] == null) {
converterMaps[encodingID] = getConverter(encodingID);
}
return converterMaps[encodingID];
}
static CMap createCMap(ByteBuffer buffer, int offset, char[] xlat) {
/* First do a sanity check that this cmap subtable is contained
* within the cmap table.
*/
int subtableFormat = buffer.getChar(offset);
long subtableLength;
if (subtableFormat < 8) {
subtableLength = buffer.getChar(offset+2);
} else {
subtableLength = buffer.getInt(offset+4) & INTMASK;
}
if (offset+subtableLength > buffer.capacity()) {
if (FontUtilities.isLogging()) {
FontUtilities.getLogger().warning("Cmap subtable overflows buffer.");
}
}
switch (subtableFormat) {
case 0: return new CMapFormat0(buffer, offset);
case 2: return new CMapFormat2(buffer, offset, xlat);
case 4: return new CMapFormat4(buffer, offset, xlat);
case 6: return new CMapFormat6(buffer, offset, xlat);
case 8: return new CMapFormat8(buffer, offset, xlat);
case 10: return new CMapFormat10(buffer, offset, xlat);
case 12: return new CMapFormat12(buffer, offset, xlat);
default: throw new RuntimeException("Cmap format unimplemented: " +
(int)buffer.getChar(offset));
}
}
/*
final char charVal(byte[] cmap, int index) {
return (char)(((0xff & cmap[index]) << 8)+(0xff & cmap[index+1]));
}
final short shortVal(byte[] cmap, int index) {
return (short)(((0xff & cmap[index]) << 8)+(0xff & cmap[index+1]));
}
*/
abstract char getGlyph(int charCode);
/* Format 4 Header is
* ushort format (off=0)
* ushort length (off=2)
* ushort language (off=4)
* ushort segCountX2 (off=6)
* ushort searchRange (off=8)
* ushort entrySelector (off=10)
* ushort rangeShift (off=12)
* ushort endCount[segCount] (off=14)
* ushort reservedPad
* ushort startCount[segCount]
* short idDelta[segCount]
* idRangeOFfset[segCount]
* ushort glyphIdArray[]
*/
static class CMapFormat4 extends CMap {
int segCount;
int entrySelector;
int rangeShift;
char[] endCount;
char[] startCount;
short[] idDelta;
char[] idRangeOffset;
char[] glyphIds;
CMapFormat4(ByteBuffer bbuffer, int offset, char[] xlat) {
this.xlat = xlat;
bbuffer.position(offset);
CharBuffer buffer = bbuffer.asCharBuffer();
buffer.get(); // skip, we already know format=4
int subtableLength = buffer.get();
/* Try to recover from some bad fonts which specify a subtable
* length that would overflow the byte buffer holding the whole
* cmap table. If this isn't a recoverable situation an exception
* may be thrown which is caught higher up the call stack.
* Whilst this may seem lenient, in practice, unless the "bad"
* subtable we are using is the last one in the cmap table we
* would have no way of knowing about this problem anyway.
*/
if (offset+subtableLength > bbuffer.capacity()) {
subtableLength = bbuffer.capacity() - offset;
}
buffer.get(); // skip language
segCount = buffer.get()/2;
int searchRange = buffer.get();
entrySelector = buffer.get();
rangeShift = buffer.get()/2;
startCount = new char[segCount];
endCount = new char[segCount];
idDelta = new short[segCount];
idRangeOffset = new char[segCount];
for (int i=0; i<segCount; i++) {
endCount[i] = buffer.get();
}
buffer.get(); // 2 bytes for reserved pad
for (int i=0; i<segCount; i++) {
startCount[i] = buffer.get();
}
for (int i=0; i<segCount; i++) {
idDelta[i] = (short)buffer.get();
}
for (int i=0; i<segCount; i++) {
char ctmp = buffer.get();
idRangeOffset[i] = (char)((ctmp>>1)&0xffff);
}
/* Can calculate the number of glyph IDs by subtracting
* "pos" from the length of the cmap
*/
int pos = (segCount*8+16)/2;
buffer.position(pos);
int numGlyphIds = (subtableLength/2 - pos);
glyphIds = new char[numGlyphIds];
for (int i=0;i<numGlyphIds;i++) {
glyphIds[i] = buffer.get();
}
/*
System.err.println("segcount="+segCount);
System.err.println("entrySelector="+entrySelector);
System.err.println("rangeShift="+rangeShift);
for (int j=0;j<segCount;j++) {
System.err.println("j="+j+ " sc="+(int)(startCount[j]&0xffff)+
" ec="+(int)(endCount[j]&0xffff)+
" delta="+idDelta[j] +
" ro="+(int)idRangeOffset[j]);
}
//System.err.println("numglyphs="+glyphIds.length);
for (int i=0;i<numGlyphIds;i++) {
System.err.println("gid["+i+"]="+(int)glyphIds[i]);
}
*/
}
char getGlyph(int charCode) {
int index = 0;
char glyphCode = 0;
int controlGlyph = getControlCodeGlyph(charCode, true);
if (controlGlyph >= 0) {
return (char)controlGlyph;
}
/* presence of translation array indicates that this
* cmap is in some other (non-unicode encoding).
* In order to look-up a char->glyph mapping we need to
* translate the unicode code point to the encoding of
* the cmap.
* REMIND: VALID CHARCODES??
*/
if (xlat != null) {
charCode = xlat[charCode];
}
/*
* Citation from the TrueType (and OpenType) spec:
* The segments are sorted in order of increasing endCode
* values, and the segment values are specified in four parallel
* arrays. You search for the first endCode that is greater than
* or equal to the character code you want to map. If the
* corresponding startCode is less than or equal to the
* character code, then you use the corresponding idDelta and
* idRangeOffset to map the character code to a glyph index
* (otherwise, the missingGlyph is returned).
*/
/*
* CMAP format4 defines several fields for optimized search of
* the segment list (entrySelector, searchRange, rangeShift).
* However, benefits are neglible and some fonts have incorrect
* data - so we use straightforward binary search (see bug 6247425)
*/
int left = 0, right = startCount.length;
index = startCount.length >> 1;
while (left < right) {
if (endCount[index] < charCode) {
left = index + 1;
} else {
right = index;
}
index = (left + right) >> 1;
}
if (charCode >= startCount[index] && charCode <= endCount[index]) {
int rangeOffset = idRangeOffset[index];
if (rangeOffset == 0) {
glyphCode = (char)(charCode + idDelta[index]);
} else {
/* Calculate an index into the glyphIds array */
/*
System.err.println("rangeoffset="+rangeOffset+
" charCode=" + charCode +
" scnt["+index+"]="+(int)startCount[index] +
" segCnt="+segCount);
*/
int glyphIDIndex = rangeOffset - segCount + index
+ (charCode - startCount[index]);
glyphCode = glyphIds[glyphIDIndex];
if (glyphCode != 0) {
glyphCode = (char)(glyphCode + idDelta[index]);
}
}
}
if (glyphCode != 0) {
//System.err.println("cc="+Integer.toHexString((int)charCode) + " gc="+(int)glyphCode);
}
return glyphCode;
}
}
// Format 0: Byte Encoding table
static class CMapFormat0 extends CMap {
byte [] cmap;
CMapFormat0(ByteBuffer buffer, int offset) {
/* skip 6 bytes of format, length, and version */
int len = buffer.getChar(offset+2);
cmap = new byte[len-6];
buffer.position(offset+6);
buffer.get(cmap);
}
char getGlyph(int charCode) {
if (charCode < 256) {
if (charCode < 0x0010) {
switch (charCode) {
case 0x0009:
case 0x000a:
case 0x000d: return CharToGlyphMapper.INVISIBLE_GLYPH_ID;
}
}
return (char)(0xff & cmap[charCode]);
} else {
return 0;
}
}
}
// static CMap createSymbolCMap(ByteBuffer buffer, int offset, char[] syms) {
// CMap cmap = createCMap(buffer, offset, null);
// if (cmap == null) {
// return null;
// } else {
// return new CMapFormatSymbol(cmap, syms);
// }
// }
// static class CMapFormatSymbol extends CMap {
// CMap cmap;
// static final int NUM_BUCKETS = 128;
// Bucket[] buckets = new Bucket[NUM_BUCKETS];
// class Bucket {
// char unicode;
// char glyph;
// Bucket next;
// Bucket(char u, char g) {
// unicode = u;
// glyph = g;
// }
// }
// CMapFormatSymbol(CMap cmap, char[] syms) {
// this.cmap = cmap;
// for (int i=0;i<syms.length;i++) {
// char unicode = syms[i];
// if (unicode != noSuchChar) {
// char glyph = cmap.getGlyph(i + 0xf000);
// int hash = unicode % NUM_BUCKETS;
// Bucket bucket = new Bucket(unicode, glyph);
// if (buckets[hash] == null) {
// buckets[hash] = bucket;
// } else {
// Bucket b = buckets[hash];
// while (b.next != null) {
// b = b.next;
// }
// b.next = bucket;
// }
// }
// }
// }
// char getGlyph(int unicode) {
// if (unicode >= 0x1000) {
// return 0;
// }
// else if (unicode >=0xf000 && unicode < 0xf100) {
// return cmap.getGlyph(unicode);
// } else {
// Bucket b = buckets[unicode % NUM_BUCKETS];
// while (b != null) {
// if (b.unicode == unicode) {
// return b.glyph;
// } else {
// b = b.next;
// }
// }
// return 0;
// }
// }
// }
// Format 2: High-byte mapping through table
static class CMapFormat2 extends CMap {
char[] subHeaderKey = new char[256];
/* Store subheaders in individual arrays
* A SubHeader entry theortically looks like {
* char firstCode;
* char entryCount;
* short idDelta;
* char idRangeOffset;
* }
*/
char[] firstCodeArray;
char[] entryCountArray;
short[] idDeltaArray;
char[] idRangeOffSetArray;
char[] glyphIndexArray;
CMapFormat2(ByteBuffer buffer, int offset, char[] xlat) {
this.xlat = xlat;
int tableLen = buffer.getChar(offset+2);
buffer.position(offset+6);
CharBuffer cBuffer = buffer.asCharBuffer();
char maxSubHeader = 0;
for (int i=0;i<256;i++) {
subHeaderKey[i] = cBuffer.get();
if (subHeaderKey[i] > maxSubHeader) {
maxSubHeader = subHeaderKey[i];
}
}
/* The value of the subHeaderKey is 8 * the subHeader index,
* so the number of subHeaders can be obtained by dividing
* this value bv 8 and adding 1.
*/
int numSubHeaders = (maxSubHeader >> 3) +1;
firstCodeArray = new char[numSubHeaders];
entryCountArray = new char[numSubHeaders];
idDeltaArray = new short[numSubHeaders];
idRangeOffSetArray = new char[numSubHeaders];
for (int i=0; i<numSubHeaders; i++) {
firstCodeArray[i] = cBuffer.get();
entryCountArray[i] = cBuffer.get();
idDeltaArray[i] = (short)cBuffer.get();
idRangeOffSetArray[i] = cBuffer.get();
// System.out.println("sh["+i+"]:fc="+(int)firstCodeArray[i]+
// " ec="+(int)entryCountArray[i]+
// " delta="+(int)idDeltaArray[i]+
// " offset="+(int)idRangeOffSetArray[i]);
}
int glyphIndexArrSize = (tableLen-518-numSubHeaders*8)/2;
glyphIndexArray = new char[glyphIndexArrSize];
for (int i=0; i<glyphIndexArrSize;i++) {
glyphIndexArray[i] = cBuffer.get();
}
}
char getGlyph(int charCode) {
int controlGlyph = getControlCodeGlyph(charCode, true);
if (controlGlyph >= 0) {
return (char)controlGlyph;
}
if (xlat != null) {
charCode = xlat[charCode];
}
char highByte = (char)(charCode >> 8);
char lowByte = (char)(charCode & 0xff);
int key = subHeaderKey[highByte]>>3; // index into subHeaders
char mapMe;
if (key != 0) {
mapMe = lowByte;
} else {
mapMe = highByte;
if (mapMe == 0) {
mapMe = lowByte;
}
}
// System.err.println("charCode="+Integer.toHexString(charCode)+
// " key="+key+ " mapMe="+Integer.toHexString(mapMe));
char firstCode = firstCodeArray[key];
if (mapMe < firstCode) {
return 0;
} else {
mapMe -= firstCode;
}
if (mapMe < entryCountArray[key]) {
/* "address" arithmetic is needed to calculate the offset
* into glyphIndexArray. "idRangeOffSetArray[key]" specifies
* the number of bytes from that location in the table where
* the subarray of glyphIndexes starting at "firstCode" begins.
* Each entry in the subHeader table is 8 bytes, and the
* idRangeOffSetArray field is at offset 6 in the entry.
* The glyphIndexArray immediately follows the subHeaders.
* So if there are "N" entries then the number of bytes to the
* start of glyphIndexArray is (N-key)*8-6.
* Subtract this from the idRangeOffSetArray value to get
* the number of bytes into glyphIndexArray and divide by 2 to
* get the (char) array index.
*/
int glyphArrayOffset = ((idRangeOffSetArray.length-key)*8)-6;
int glyphSubArrayStart =
(idRangeOffSetArray[key] - glyphArrayOffset)/2;
char glyphCode = glyphIndexArray[glyphSubArrayStart+mapMe];
if (glyphCode != 0) {
glyphCode += idDeltaArray[key]; //idDelta
return glyphCode;
}
}
return 0;
}
}
// Format 6: Trimmed table mapping
static class CMapFormat6 extends CMap {
char firstCode;
char entryCount;
char[] glyphIdArray;
CMapFormat6(ByteBuffer bbuffer, int offset, char[] xlat) {
bbuffer.position(offset+6);
CharBuffer buffer = bbuffer.asCharBuffer();
firstCode = buffer.get();
entryCount = buffer.get();
glyphIdArray = new char[entryCount];
for (int i=0; i< entryCount; i++) {
glyphIdArray[i] = buffer.get();
}
}
char getGlyph(int charCode) {
int controlGlyph = getControlCodeGlyph(charCode, true);
if (controlGlyph >= 0) {
return (char)controlGlyph;
}
if (xlat != null) {
charCode = xlat[charCode];
}
charCode -= firstCode;
if (charCode < 0 || charCode >= entryCount) {
return 0;
} else {
return glyphIdArray[charCode];
}
}
}
// Format 8: mixed 16-bit and 32-bit coverage
// Seems unlikely this code will ever get tested as we look for
// MS platform Cmaps and MS states (in the Opentype spec on their website)
// that MS doesn't support this format
static class CMapFormat8 extends CMap {
byte[] is32 = new byte[8192];
int nGroups;
int[] startCharCode;
int[] endCharCode;
int[] startGlyphID;
CMapFormat8(ByteBuffer bbuffer, int offset, char[] xlat) {
bbuffer.position(12);
bbuffer.get(is32);
nGroups = bbuffer.getInt();
startCharCode = new int[nGroups];
endCharCode = new int[nGroups];
startGlyphID = new int[nGroups];
}
char getGlyph(int charCode) {
if (xlat != null) {
throw new RuntimeException("xlat array for cmap fmt=8");
}
return 0;
}
}
// Format 4-byte 10: Trimmed table mapping
// Seems unlikely this code will ever get tested as we look for
// MS platform Cmaps and MS states (in the Opentype spec on their website)
// that MS doesn't support this format
static class CMapFormat10 extends CMap {
long firstCode;
int entryCount;
char[] glyphIdArray;
CMapFormat10(ByteBuffer bbuffer, int offset, char[] xlat) {
firstCode = bbuffer.getInt() & INTMASK;
entryCount = bbuffer.getInt() & INTMASK;
bbuffer.position(offset+20);
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