Java example source code file (PlatformFont.java)
The PlatformFont.java Java example source code
/*
* Copyright (c) 1996, 2010, 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.awt;
import java.awt.peer.FontPeer;
import java.util.Locale;
import java.util.Vector;
import sun.font.SunFontManager;
import sun.java2d.FontSupport;
import java.nio.CharBuffer;
import java.nio.ByteBuffer;
public abstract class PlatformFont implements FontPeer {
static {
NativeLibLoader.loadLibraries();
initIDs();
}
protected FontDescriptor[] componentFonts;
protected char defaultChar;
protected FontConfiguration fontConfig;
protected FontDescriptor defaultFont;
protected String familyName;
private Object[] fontCache;
// Maybe this should be a property that is set based
// on the locale?
protected static int FONTCACHESIZE = 256;
protected static int FONTCACHEMASK = PlatformFont.FONTCACHESIZE - 1;
protected static String osVersion;
public PlatformFont(String name, int style){
SunFontManager sfm = SunFontManager.getInstance();
if (sfm instanceof FontSupport) {
fontConfig = ((FontSupport)sfm).getFontConfiguration();
}
if (fontConfig == null) {
return;
}
// map given font name to a valid logical font family name
familyName = name.toLowerCase(Locale.ENGLISH);
if (!FontConfiguration.isLogicalFontFamilyName(familyName)) {
familyName = fontConfig.getFallbackFamilyName(familyName, "sansserif");
}
componentFonts = fontConfig.getFontDescriptors(familyName, style);
// search default character
//
char missingGlyphCharacter = getMissingGlyphCharacter();
defaultChar = '?';
if (componentFonts.length > 0)
defaultFont = componentFonts[0];
for (int i = 0; i < componentFonts.length; i++){
if (componentFonts[i].isExcluded(missingGlyphCharacter)) {
continue;
}
if (componentFonts[i].encoder.canEncode(missingGlyphCharacter)) {
defaultFont = componentFonts[i];
defaultChar = missingGlyphCharacter;
break;
}
}
}
/**
* Returns the character that should be rendered when a glyph
* is missing.
*/
protected abstract char getMissingGlyphCharacter();
/**
* make a array of CharsetString with given String.
*/
public CharsetString[] makeMultiCharsetString(String str){
return makeMultiCharsetString(str.toCharArray(), 0, str.length(), true);
}
/**
* make a array of CharsetString with given String.
*/
public CharsetString[] makeMultiCharsetString(String str, boolean allowdefault){
return makeMultiCharsetString(str.toCharArray(), 0, str.length(), allowdefault);
}
/**
* make a array of CharsetString with given char array.
* @param str The char array to convert.
* @param offset offset of first character of interest
* @param len number of characters to convert
*/
public CharsetString[] makeMultiCharsetString(char str[], int offset, int len) {
return makeMultiCharsetString(str, offset, len, true);
}
/**
* make a array of CharsetString with given char array.
* @param str The char array to convert.
* @param offset offset of first character of interest
* @param len number of characters to convert
* @param allowDefault whether to allow the default char.
* Setting this to true overloads the meaning of this method to
* return non-null only if all chars can be converted.
* @return array of CharsetString or if allowDefault is false and any
* of the returned chars would have been converted to a default char,
* then return null.
* This is used to choose alternative means of displaying the text.
*/
public CharsetString[] makeMultiCharsetString(char str[], int offset, int len,
boolean allowDefault) {
if (len < 1) {
return new CharsetString[0];
}
Vector mcs = null;
char[] tmpStr = new char[len];
char tmpChar = defaultChar;
boolean encoded = false;
FontDescriptor currentFont = defaultFont;
for (int i = 0; i < componentFonts.length; i++) {
if (componentFonts[i].isExcluded(str[offset])){
continue;
}
/* Need "encoded" variable to distinguish the case when
* the default char is the same as the encoded char.
* The defaultChar on Linux is '?' so it is needed there.
*/
if (componentFonts[i].encoder.canEncode(str[offset])){
currentFont = componentFonts[i];
tmpChar = str[offset];
encoded = true;
break;
}
}
if (!allowDefault && !encoded) {
return null;
} else {
tmpStr[0] = tmpChar;
}
int lastIndex = 0;
for (int i = 1; i < len; i++){
char ch = str[offset + i];
FontDescriptor fd = defaultFont;
tmpChar = defaultChar;
encoded = false;
for (int j = 0; j < componentFonts.length; j++){
if (componentFonts[j].isExcluded(ch)){
continue;
}
if (componentFonts[j].encoder.canEncode(ch)){
fd = componentFonts[j];
tmpChar = ch;
encoded = true;
break;
}
}
if (!allowDefault && !encoded) {
return null;
} else {
tmpStr[i] = tmpChar;
}
if (currentFont != fd){
if (mcs == null) {
mcs = new Vector(3);
}
mcs.addElement(new CharsetString(tmpStr, lastIndex,
i-lastIndex, currentFont));
currentFont = fd;
fd = defaultFont;
lastIndex = i;
}
}
CharsetString[] result;
CharsetString cs = new CharsetString(tmpStr, lastIndex,
len-lastIndex, currentFont);
if (mcs == null) {
result = new CharsetString[1];
result[0] = cs;
} else {
mcs.addElement(cs);
result = new CharsetString[mcs.size()];
for (int i = 0; i < mcs.size(); i++){
result[i] = (CharsetString)mcs.elementAt(i);
}
}
return result;
}
/**
* Is it possible that this font's metrics require the multi-font calls?
* This might be true, for example, if the font supports kerning.
**/
public boolean mightHaveMultiFontMetrics() {
return fontConfig != null;
}
/**
* Specialized fast path string conversion for AWT.
*/
public Object[] makeConvertedMultiFontString(String str)
{
return makeConvertedMultiFontChars(str.toCharArray(),0,str.length());
}
public Object[] makeConvertedMultiFontChars(char[] data,
int start, int len)
{
Object[] result = new Object[2];
Object[] workingCache;
byte[] convertedData = null;
int stringIndex = start;
int convertedDataIndex = 0;
int resultIndex = 0;
int cacheIndex;
FontDescriptor currentFontDescriptor = null;
FontDescriptor lastFontDescriptor = null;
char currentDefaultChar;
PlatformFontCache theChar;
// Simple bounds check
int end = start + len;
if (start < 0 || end > data.length) {
throw new ArrayIndexOutOfBoundsException();
}
if(stringIndex >= end) {
return null;
}
// coversion loop
while(stringIndex < end)
{
currentDefaultChar = data[stringIndex];
// Note that cache sizes must be a power of two!
cacheIndex = (int)(currentDefaultChar & this.FONTCACHEMASK);
theChar = (PlatformFontCache)getFontCache()[cacheIndex];
// Is the unicode char we want cached?
if(theChar == null || theChar.uniChar != currentDefaultChar)
{
/* find a converter that can convert the current character */
currentFontDescriptor = defaultFont;
currentDefaultChar = defaultChar;
char ch = (char)data[stringIndex];
int componentCount = componentFonts.length;
for (int j = 0; j < componentCount; j++) {
FontDescriptor fontDescriptor = componentFonts[j];
fontDescriptor.encoder.reset();
//fontDescriptor.encoder.onUnmappleCharacterAction(...);
if (fontDescriptor.isExcluded(ch)) {
continue;
}
if (fontDescriptor.encoder.canEncode(ch)) {
currentFontDescriptor = fontDescriptor;
currentDefaultChar = ch;
break;
}
}
try {
char[] input = new char[1];
input[0] = currentDefaultChar;
theChar = new PlatformFontCache();
if (currentFontDescriptor.useUnicode()) {
/*
currentFontDescriptor.unicodeEncoder.encode(CharBuffer.wrap(input),
theChar.bb,
true);
*/
if (currentFontDescriptor.isLE) {
theChar.bb.put((byte)(input[0] & 0xff));
theChar.bb.put((byte)(input[0] >>8));
} else {
theChar.bb.put((byte)(input[0] >> 8));
theChar.bb.put((byte)(input[0] & 0xff));
}
}
else {
currentFontDescriptor.encoder.encode(CharBuffer.wrap(input),
theChar.bb,
true);
}
theChar.fontDescriptor = currentFontDescriptor;
theChar.uniChar = data[stringIndex];
getFontCache()[cacheIndex] = theChar;
} catch(Exception e){
// Should never happen!
System.err.println(e);
e.printStackTrace();
return null;
}
}
// Check to see if we've changed fonts.
if(lastFontDescriptor != theChar.fontDescriptor) {
if(lastFontDescriptor != null) {
result[resultIndex++] = lastFontDescriptor;
result[resultIndex++] = convertedData;
// Add the size to the converted data field.
if(convertedData != null) {
convertedDataIndex -= 4;
convertedData[0] = (byte)(convertedDataIndex >> 24);
convertedData[1] = (byte)(convertedDataIndex >> 16);
convertedData[2] = (byte)(convertedDataIndex >> 8);
convertedData[3] = (byte)convertedDataIndex;
}
if(resultIndex >= result.length) {
Object[] newResult = new Object[result.length * 2];
System.arraycopy(result, 0, newResult, 0,
result.length);
result = newResult;
}
}
if (theChar.fontDescriptor.useUnicode()) {
convertedData = new byte[(end - stringIndex + 1) *
(int)theChar.fontDescriptor.unicodeEncoder.maxBytesPerChar()
+ 4];
}
else {
convertedData = new byte[(end - stringIndex + 1) *
(int)theChar.fontDescriptor.encoder.maxBytesPerChar()
+ 4];
}
convertedDataIndex = 4;
lastFontDescriptor = theChar.fontDescriptor;
}
byte[] ba = theChar.bb.array();
int size = theChar.bb.position();
if(size == 1) {
convertedData[convertedDataIndex++] = ba[0];
}
else if(size == 2) {
convertedData[convertedDataIndex++] = ba[0];
convertedData[convertedDataIndex++] = ba[1];
} else if(size == 3) {
convertedData[convertedDataIndex++] = ba[0];
convertedData[convertedDataIndex++] = ba[1];
convertedData[convertedDataIndex++] = ba[2];
} else if(size == 4) {
convertedData[convertedDataIndex++] = ba[0];
convertedData[convertedDataIndex++] = ba[1];
convertedData[convertedDataIndex++] = ba[2];
convertedData[convertedDataIndex++] = ba[3];
}
stringIndex++;
}
result[resultIndex++] = lastFontDescriptor;
result[resultIndex] = convertedData;
// Add the size to the converted data field.
if(convertedData != null) {
convertedDataIndex -= 4;
convertedData[0] = (byte)(convertedDataIndex >> 24);
convertedData[1] = (byte)(convertedDataIndex >> 16);
convertedData[2] = (byte)(convertedDataIndex >> 8);
convertedData[3] = (byte)convertedDataIndex;
}
return result;
}
/*
* Create fontCache on demand instead of during construction to
* reduce overall memory consumption.
*
* This method is declared final so that its code can be inlined
* by the compiler.
*/
protected final Object[] getFontCache() {
// This method is not MT-safe by design. Since this is just a
// cache anyways, it's okay if we occasionally allocate the array
// twice or return an array which will be dereferenced and gced
// right away.
if (fontCache == null) {
fontCache = new Object[this.FONTCACHESIZE];
}
return fontCache;
}
/**
* Initialize JNI field and method IDs
*/
private static native void initIDs();
class PlatformFontCache
{
char uniChar;
FontDescriptor fontDescriptor;
ByteBuffer bb = ByteBuffer.allocate(4);
}
}
Other Java examples (source code examples)Here is a short list of links related to this Java PlatformFont.java source code file: |
The search page
Other Java source code examples at this package level
Click here to learn more about this project
