JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2014, 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
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*/
/*
*
* (C) Copyright IBM Corp. 1999-2003 - All Rights Reserved
*
* The original version of this source code and documentation is
* copyrighted and owned by IBM. These materials are provided
* under terms of a License Agreement between IBM and Sun.
* This technology is protected by multiple US and International
* patents. This notice and attribution to IBM may not be removed.
*/
/*
* GlyphLayout is used to process a run of text into a run of run of
* glyphs, optionally with position and char mapping info.
*
* The text has already been processed for numeric shaping and bidi.
* The run of text that layout works on has a single bidi level. It
* also has a single font/style. Some operations need context to work
* on (shaping, script resolution) so context for the text run text is
* provided. It is assumed that the text array contains sufficient
* context, and the offset and count delimit the portion of the text
* that needs to actually be processed.
*
* The font might be a composite font. Layout generally requires
* tables from a single physical font to operate, and so it must
* resolve the 'single' font run into runs of physical fonts.
*
* Some characters are supported by several fonts of a composite, and
* in order to properly emulate the glyph substitution behavior of a
* single physical font, these characters might need to be mapped to
* different physical fonts. The script code that is assigned
* characters normally considered 'common script' can be used to
* resolve which physical font to use for these characters. The input
* to the char to glyph mapper (which assigns physical fonts as it
* processes the glyphs) should include the script code, and the
* mapper should operate on runs of a single script.
*
* To perform layout, call get() to get a new (or reuse an old)
* GlyphLayout, call layout on it, then call done(GlyphLayout) when
* finished. There's no particular problem if you don't call done,
* but it assists in reuse of the GlyphLayout.
*/
package sun.font;
import java.lang.ref.SoftReference;
import java.awt.Font;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.concurrent.ConcurrentHashMap;
import static java.lang.Character.*;
public final class GlyphLayout {
// data for glyph vector
private GVData _gvdata;
// cached glyph layout data for reuse
private static volatile GlyphLayout cache; // reusable
private LayoutEngineFactory _lef; // set when get is called, unset when done is called
private TextRecord _textRecord; // the text we're working on, used by iterators
private ScriptRun _scriptRuns; // iterator over script runs
private FontRunIterator _fontRuns; // iterator over physical fonts in a composite
private int _ercount;
private ArrayList<EngineRecord> _erecords;
private Point2D.Float _pt;
private FontStrikeDesc _sd;
private float[] _mat;
private float ptSize;
private int _typo_flags;
private int _offset;
public static final class LayoutEngineKey {
private Font2D font;
private int script;
private int lang;
LayoutEngineKey() {
}
LayoutEngineKey(Font2D font, int script, int lang) {
init(font, script, lang);
}
void init(Font2D font, int script, int lang) {
this.font = font;
this.script = script;
this.lang = lang;
}
LayoutEngineKey copy() {
return new LayoutEngineKey(font, script, lang);
}
Font2D font() {
return font;
}
int script() {
return script;
}
int lang() {
return lang;
}
public boolean equals(Object rhs) {
if (this == rhs) return true;
if (rhs == null) return false;
try {
LayoutEngineKey that = (LayoutEngineKey)rhs;
return this.script == that.script &&
this.lang == that.lang &&
this.font.equals(that.font);
}
catch (ClassCastException e) {
return false;
}
}
public int hashCode() {
return script ^ lang ^ font.hashCode();
}
}
public static interface LayoutEngineFactory {
/**
* Given a font, script, and language, determine a layout engine to use.
*/
public LayoutEngine getEngine(Font2D font, int script, int lang);
/**
* Given a key, determine a layout engine to use.
*/
public LayoutEngine getEngine(LayoutEngineKey key);
}
public static interface LayoutEngine {
/**
* Given a strike descriptor, text, rtl flag, and starting point, append information about
* glyphs, positions, and character indices to the glyphvector data, and advance the point.
*
* If the GVData does not have room for the glyphs, throws an IndexOutOfBoundsException and
* leave pt and the gvdata unchanged.
*/
public void layout(FontStrikeDesc sd, float[] mat, float ptSize, int gmask,
int baseIndex, TextRecord text, int typo_flags, Point2D.Float pt, GVData data);
}
/**
* Return a new instance of GlyphLayout, using the provided layout engine factory.
* If null, the system layout engine factory will be used.
*/
public static GlyphLayout get(LayoutEngineFactory lef) {
if (lef == null) {
lef = SunLayoutEngine.instance();
}
GlyphLayout result = null;
synchronized(GlyphLayout.class) {
if (cache != null) {
result = cache;
cache = null;
}
}
if (result == null) {
result = new GlyphLayout();
}
result._lef = lef;
return result;
}
/**
* Return the old instance of GlyphLayout when you are done. This enables reuse
* of GlyphLayout objects.
*/
public static void done(GlyphLayout gl) {
gl._lef = null;
cache = gl; // object reference assignment is thread safe, it says here...
}
private static final class SDCache {
public Font key_font;
public FontRenderContext key_frc;
public AffineTransform dtx;
public AffineTransform invdtx;
public AffineTransform gtx;
public Point2D.Float delta;
public FontStrikeDesc sd;
private SDCache(Font font, FontRenderContext frc) {
key_font = font;
key_frc = frc;
// !!! add getVectorTransform and hasVectorTransform to frc? then
// we could just skip this work...
dtx = frc.getTransform();
dtx.setTransform(dtx.getScaleX(), dtx.getShearY(),
dtx.getShearX(), dtx.getScaleY(),
0, 0);
if (!dtx.isIdentity()) {
try {
invdtx = dtx.createInverse();
}
catch (NoninvertibleTransformException e) {
throw new InternalError(e);
}
}
float ptSize = font.getSize2D();
if (font.isTransformed()) {
gtx = font.getTransform();
gtx.scale(ptSize, ptSize);
delta = new Point2D.Float((float)gtx.getTranslateX(),
(float)gtx.getTranslateY());
gtx.setTransform(gtx.getScaleX(), gtx.getShearY(),
gtx.getShearX(), gtx.getScaleY(),
0, 0);
gtx.preConcatenate(dtx);
} else {
delta = ZERO_DELTA;
gtx = new AffineTransform(dtx);
gtx.scale(ptSize, ptSize);
}
/* Similar logic to that used in SunGraphics2D.checkFontInfo().
* Whether a grey (AA) strike is needed is size dependent if
* AA mode is 'gasp'.
*/
int aa =
FontStrikeDesc.getAAHintIntVal(frc.getAntiAliasingHint(),
FontUtilities.getFont2D(font),
(int)Math.abs(ptSize));
int fm = FontStrikeDesc.getFMHintIntVal
(frc.getFractionalMetricsHint());
sd = new FontStrikeDesc(dtx, gtx, font.getStyle(), aa, fm);
}
private static final Point2D.Float ZERO_DELTA = new Point2D.Float();
private static
SoftReference<ConcurrentHashMap<SDKey, SDCache>> cacheRef;
private static final class SDKey {
private final Font font;
private final FontRenderContext frc;
private final int hash;
SDKey(Font font, FontRenderContext frc) {
this.font = font;
this.frc = frc;
this.hash = font.hashCode() ^ frc.hashCode();
}
public int hashCode() {
return hash;
}
public boolean equals(Object o) {
try {
SDKey rhs = (SDKey)o;
return
hash == rhs.hash &&
font.equals(rhs.font) &&
frc.equals(rhs.frc);
}
catch (ClassCastException e) {
}
return false;
}
}
public static SDCache get(Font font, FontRenderContext frc) {
// It is possible a translation component will be in the FRC.
// It doesn't affect us except adversely as we would consider
// FRC's which are really the same to be different. If we
// detect a translation component, then we need to exclude it
// by creating a new transform which excludes the translation.
if (frc.isTransformed()) {
AffineTransform transform = frc.getTransform();
if (transform.getTranslateX() != 0 ||
transform.getTranslateY() != 0) {
transform = new AffineTransform(transform.getScaleX(),
transform.getShearY(),
transform.getShearX(),
transform.getScaleY(),
0, 0);
frc = new FontRenderContext(transform,
frc.getAntiAliasingHint(),
frc.getFractionalMetricsHint()
);
}
}
SDKey key = new SDKey(font, frc); // garbage, yuck...
ConcurrentHashMap<SDKey, SDCache> cache = null;
SDCache res = null;
if (cacheRef != null) {
cache = cacheRef.get();
if (cache != null) {
res = cache.get(key);
}
}
if (res == null) {
res = new SDCache(font, frc);
if (cache == null) {
cache = new ConcurrentHashMap<SDKey, SDCache>(10);
cacheRef = new
SoftReference<ConcurrentHashMap<SDKey, SDCache>>(cache);
} else if (cache.size() >= 512) {
cache.clear();
}
cache.put(key, res);
}
return res;
}
}
/**
* Create a glyph vector.
* @param font the font to use
* @param frc the font render context
* @param text the text, including optional context before start and after start + count
* @param offset the start of the text to lay out
* @param count the length of the text to lay out
* @param flags bidi and context flags {@see #java.awt.Font}
* @param result a StandardGlyphVector to modify, can be null
* @return the layed out glyphvector, if result was passed in, it is returned
*/
public StandardGlyphVector layout(Font font, FontRenderContext frc,
char[] text, int offset, int count,
int flags, StandardGlyphVector result)
{
if (text == null || offset < 0 || count < 0 || (count > text.length - offset)) {
throw new IllegalArgumentException();
}
init(count);
// need to set after init
// go through the back door for this
if (font.hasLayoutAttributes()) {
AttributeValues values = ((AttributeMap)font.getAttributes()).getValues();
if (values.getKerning() != 0) _typo_flags |= 0x1;
if (values.getLigatures() != 0) _typo_flags |= 0x2;
}
_offset = offset;
// use cache now - can we use the strike cache for this?
SDCache txinfo = SDCache.get(font, frc);
_mat[0] = (float)txinfo.gtx.getScaleX();
_mat[1] = (float)txinfo.gtx.getShearY();
_mat[2] = (float)txinfo.gtx.getShearX();
_mat[3] = (float)txinfo.gtx.getScaleY();
_pt.setLocation(txinfo.delta);
ptSize = font.getSize2D();
int lim = offset + count;
int min = 0;
int max = text.length;
if (flags != 0) {
if ((flags & Font.LAYOUT_RIGHT_TO_LEFT) != 0) {
_typo_flags |= 0x80000000; // RTL
}
if ((flags & Font.LAYOUT_NO_START_CONTEXT) != 0) {
min = offset;
}
if ((flags & Font.LAYOUT_NO_LIMIT_CONTEXT) != 0) {
max = lim;
}
}
int lang = -1; // default for now
Font2D font2D = FontUtilities.getFont2D(font);
if (font2D instanceof FontSubstitution) {
font2D = ((FontSubstitution)font2D).getCompositeFont2D();
}
_textRecord.init(text, offset, lim, min, max);
int start = offset;
if (font2D instanceof CompositeFont) {
_scriptRuns.init(text, offset, count); // ??? how to handle 'common' chars
_fontRuns.init((CompositeFont)font2D, text, offset, lim);
while (_scriptRuns.next()) {
int limit = _scriptRuns.getScriptLimit();
int script = _scriptRuns.getScriptCode();
while (_fontRuns.next(script, limit)) {
Font2D pfont = _fontRuns.getFont();
/* layout can't deal with NativeFont instances. The
* native font is assumed to know of a suitable non-native
* substitute font. This currently works because
* its consistent with the way NativeFonts delegate
* in other cases too.
*/
if (pfont instanceof NativeFont) {
pfont = ((NativeFont)pfont).getDelegateFont();
}
int gmask = _fontRuns.getGlyphMask();
int pos = _fontRuns.getPos();
nextEngineRecord(start, pos, script, lang, pfont, gmask);
start = pos;
}
}
} else {
_scriptRuns.init(text, offset, count); // ??? don't worry about 'common' chars
while (_scriptRuns.next()) {
int limit = _scriptRuns.getScriptLimit();
int script = _scriptRuns.getScriptCode();
nextEngineRecord(start, limit, script, lang, font2D, 0);
start = limit;
}
}
int ix = 0;
int stop = _ercount;
int dir = 1;
if (_typo_flags < 0) { // RTL
ix = stop - 1;
stop = -1;
dir = -1;
}
// _sd.init(dtx, gtx, font.getStyle(), frc.isAntiAliased(), frc.usesFractionalMetrics());
_sd = txinfo.sd;
for (;ix != stop; ix += dir) {
EngineRecord er = _erecords.get(ix);
for (;;) {
try {
er.layout();
break;
}
catch (IndexOutOfBoundsException e) {
if (_gvdata._count >=0) {
_gvdata.grow();
}
}
}
// Break out of the outer for loop if layout fails.
if (_gvdata._count < 0) {
break;
}
}
// if (txinfo.invdtx != null) {
// _gvdata.adjustPositions(txinfo.invdtx);
// }
// If layout fails (negative glyph count) create an un-laid out GV instead.
// ie default positions. This will be a lot better than the alternative of
// a complete blank layout.
StandardGlyphVector gv;
if (_gvdata._count < 0) {
gv = new StandardGlyphVector(font, text, offset, count, frc);
if (FontUtilities.debugFonts()) {
FontUtilities.getLogger().warning("OpenType layout failed on font: " +
font);
}
} else {
gv = _gvdata.createGlyphVector(font, frc, result);
}
// System.err.println("Layout returns: " + gv);
return gv;
}
//
// private methods
//
private GlyphLayout() {
this._gvdata = new GVData();
this._textRecord = new TextRecord();
this._scriptRuns = new ScriptRun();
this._fontRuns = new FontRunIterator();
this._erecords = new ArrayList<>(10);
this._pt = new Point2D.Float();
this._sd = new FontStrikeDesc();
this._mat = new float[4];
}
private void init(int capacity) {
this._typo_flags = 0;
this._ercount = 0;
this._gvdata.init(capacity);
}
private void nextEngineRecord(int start, int limit, int script, int lang, Font2D font, int gmask) {
EngineRecord er = null;
if (_ercount == _erecords.size()) {
er = new EngineRecord();
_erecords.add(er);
} else {
er = _erecords.get(_ercount);
}
er.init(start, limit, font, script, lang, gmask);
++_ercount;
}
/**
* Storage for layout to build glyph vector data, then generate a real GlyphVector
*/
public static final class GVData {
public int _count; // number of glyphs, >= number of chars
public int _flags;
public int[] _glyphs;
public float[] _positions;
public int[] _indices;
private static final int UNINITIALIZED_FLAGS = -1;
public void init(int size) {
_count = 0;
_flags = UNINITIALIZED_FLAGS;
if (_glyphs == null || _glyphs.length < size) {
if (size < 20) {
size = 20;
}
_glyphs = new int[size];
_positions = new float[size * 2 + 2];
_indices = new int[size];
}
}
public void grow() {
grow(_glyphs.length / 4); // always grows because min length is 20
}
public void grow(int delta) {
int size = _glyphs.length + delta;
int[] nglyphs = new int[size];
System.arraycopy(_glyphs, 0, nglyphs, 0, _count);
_glyphs = nglyphs;
float[] npositions = new float[size * 2 + 2];
System.arraycopy(_positions, 0, npositions, 0, _count * 2 + 2);
_positions = npositions;
int[] nindices = new int[size];
System.arraycopy(_indices, 0, nindices, 0, _count);
_indices = nindices;
}
public void adjustPositions(AffineTransform invdtx) {
invdtx.transform(_positions, 0, _positions, 0, _count);
}
public StandardGlyphVector createGlyphVector(Font font, FontRenderContext frc, StandardGlyphVector result) {
// !!! default initialization until we let layout engines do it
if (_flags == UNINITIALIZED_FLAGS) {
_flags = 0;
if (_count > 1) { // if only 1 glyph assume LTR
boolean ltr = true;
boolean rtl = true;
int rtlix = _count; // rtl index
for (int i = 0; i < _count && (ltr || rtl); ++i) {
int cx = _indices[i];
ltr = ltr && (cx == i);
rtl = rtl && (cx == --rtlix);
}
if (rtl) _flags |= GlyphVector.FLAG_RUN_RTL;
if (!rtl && !ltr) _flags |= GlyphVector.FLAG_COMPLEX_GLYPHS;
}
// !!! layout engines need to tell us whether they performed
// position adjustments. currently they don't tell us, so
// we must assume they did
_flags |= GlyphVector.FLAG_HAS_POSITION_ADJUSTMENTS;
}
int[] glyphs = new int[_count];
System.arraycopy(_glyphs, 0, glyphs, 0, _count);
float[] positions = null;
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