JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2005, 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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*/
package sun.font;
import java.awt.Font;
import java.awt.font.FontRenderContext;
import java.awt.geom.AffineTransform;
import static sun.awt.SunHints.*;
/*
* This class encapsulates every thing needed that distinguishes a strike.
* It can be used as a key to locate a FontStrike in a Hashmap/cache.
* It is not mutatable, but contains mutatable AffineTransform objects,
* which for performance reasons it does not keep private copies of.
* Therefore code constructing these must pass in transforms it guarantees
* not to mutate.
*/
public class FontStrikeDesc {
/* Values to use as a mask that is used for faster comparison of
* two strikes using just an int equality test.
* The ones we don't use are listed here but commented out.
* ie style is already built and hint "OFF" values are zero.
* Note that this is used as a strike key and the same strike is used
* for HRGB and HBGR, so only the orientation needed (H or V) is needed
* to construct and distinguish a FontStrikeDesc. The rgb ordering
* needed for rendering is stored in the graphics state.
*/
// static final int STYLE_PLAIN = Font.PLAIN; // 0x0000
// static final int STYLE_BOLD = Font.BOLD; // 0x0001
// static final int STYLE_ITALIC = Font.ITALIC; // 0x0002
// static final int STYLE_BOLDITALIC = Font.BOLD|Font.ITALIC; // 0x0003
// static final int AA_OFF = 0x0000;
static final int AA_ON = 0x0010;
static final int AA_LCD_H = 0x0020;
static final int AA_LCD_V = 0x0040;
// static final int FRAC_METRICS_OFF = 0x0000;
static final int FRAC_METRICS_ON = 0x0100;
static final int FRAC_METRICS_SP = 0x0200;
/* devTx is to get an inverse transform to get user space values
* for metrics. Its not used otherwise, as the glyphTx is the important
* one. But it does mean that a strike representing a 6pt font and identity
* graphics transform is not equal to one for a 12 pt font and 2x scaled
* graphics transform. Its likely to be very rare that this causes
* duplication.
*/
AffineTransform devTx;
AffineTransform glyphTx; // all of ptSize, Font tx and Graphics tx.
int style;
int aaHint;
int fmHint;
private int hashCode;
private int valuemask;
public int hashCode() {
/* Can cache hashcode since a strike(desc) is immutable.*/
if (hashCode == 0) {
hashCode = glyphTx.hashCode() + devTx.hashCode() + valuemask;
}
return hashCode;
}
public boolean equals(Object obj) {
try {
FontStrikeDesc desc = (FontStrikeDesc)obj;
return (desc.valuemask == this.valuemask &&
desc.glyphTx.equals(this.glyphTx) &&
desc.devTx.equals(this.devTx));
} catch (Exception e) {
/* class cast or NP exceptions should not happen often, if ever,
* and I am hoping that this is faster than an instanceof check.
*/
return false;
}
}
FontStrikeDesc() {
// used with init
}
/* This maps a public text AA hint value into one of the subset of values
* used to index strikes. For the purpose of the strike cache there are
* only 4 values : OFF, ON, LCD_HRGB, LCD_VRGB.
* Font and ptSize are needed to resolve the 'gasp' table. The ptSize
* must therefore include device and font transforms.
*/
public static int getAAHintIntVal(Object aa, Font2D font2D, int ptSize) {
if (aa == VALUE_TEXT_ANTIALIAS_OFF ||
aa == VALUE_TEXT_ANTIALIAS_DEFAULT) {
return INTVAL_TEXT_ANTIALIAS_OFF;
} else if (aa == VALUE_TEXT_ANTIALIAS_ON) {
return INTVAL_TEXT_ANTIALIAS_ON;
} else if (aa == VALUE_TEXT_ANTIALIAS_GASP) {
if (font2D.useAAForPtSize(ptSize)) {
return INTVAL_TEXT_ANTIALIAS_ON;
} else {
return INTVAL_TEXT_ANTIALIAS_OFF;
}
} else if (aa == VALUE_TEXT_ANTIALIAS_LCD_HRGB ||
aa == VALUE_TEXT_ANTIALIAS_LCD_HBGR) {
return INTVAL_TEXT_ANTIALIAS_LCD_HRGB;
} else if (aa == VALUE_TEXT_ANTIALIAS_LCD_VRGB ||
aa == VALUE_TEXT_ANTIALIAS_LCD_VBGR) {
return INTVAL_TEXT_ANTIALIAS_LCD_VRGB;
} else {
return INTVAL_TEXT_ANTIALIAS_OFF;
}
}
/* This maps a public text AA hint value into one of the subset of values
* used to index strikes. For the purpose of the strike cache there are
* only 4 values : OFF, ON, LCD_HRGB, LCD_VRGB.
* Font and FontRenderContext are needed to resolve the 'gasp' table.
* This is similar to the method above, but used by callers which have not
* already calculated the glyph device point size.
*/
public static int getAAHintIntVal(Font2D font2D, Font font,
FontRenderContext frc) {
Object aa = frc.getAntiAliasingHint();
if (aa == VALUE_TEXT_ANTIALIAS_OFF ||
aa == VALUE_TEXT_ANTIALIAS_DEFAULT) {
return INTVAL_TEXT_ANTIALIAS_OFF;
} else if (aa == VALUE_TEXT_ANTIALIAS_ON) {
return INTVAL_TEXT_ANTIALIAS_ON;
} else if (aa == VALUE_TEXT_ANTIALIAS_GASP) {
/* FRC.isIdentity() would have been useful */
int ptSize;
AffineTransform tx = frc.getTransform();
if (tx.isIdentity() && !font.isTransformed()) {
ptSize = font.getSize();
} else {
/* one or both transforms is not identity */
float size = font.getSize2D();
if (tx.isIdentity()) {
tx = font.getTransform();
tx.scale(size, size);
} else {
tx.scale(size, size);
if (font.isTransformed()) {
tx.concatenate(font.getTransform());
}
}
double shearx = tx.getShearX();
double scaley = tx.getScaleY();
if (shearx != 0) {
scaley = Math.sqrt(shearx * shearx + scaley * scaley);
}
ptSize = (int)(Math.abs(scaley)+0.5);
}
if (font2D.useAAForPtSize(ptSize)) {
return INTVAL_TEXT_ANTIALIAS_ON;
} else {
return INTVAL_TEXT_ANTIALIAS_OFF;
}
} else if (aa == VALUE_TEXT_ANTIALIAS_LCD_HRGB ||
aa == VALUE_TEXT_ANTIALIAS_LCD_HBGR) {
return INTVAL_TEXT_ANTIALIAS_LCD_HRGB;
} else if (aa == VALUE_TEXT_ANTIALIAS_LCD_VRGB ||
aa == VALUE_TEXT_ANTIALIAS_LCD_VBGR) {
return INTVAL_TEXT_ANTIALIAS_LCD_VRGB;
} else {
return INTVAL_TEXT_ANTIALIAS_OFF;
}
}
public static int getFMHintIntVal(Object fm) {
if (fm == VALUE_FRACTIONALMETRICS_OFF ||
fm == VALUE_FRACTIONALMETRICS_DEFAULT) {
return INTVAL_FRACTIONALMETRICS_OFF;
} else {
return INTVAL_FRACTIONALMETRICS_ON;
}
}
public FontStrikeDesc(AffineTransform devAt, AffineTransform at,
int fStyle, int aa, int fm) {
devTx = devAt;
glyphTx = at; // not cloning glyphTx. Callers trusted to not mutate it.
style = fStyle;
aaHint = aa;
fmHint = fm;
valuemask = fStyle;
switch (aa) {
case INTVAL_TEXT_ANTIALIAS_OFF :
break;
case INTVAL_TEXT_ANTIALIAS_ON :
valuemask |= AA_ON;
break;
case INTVAL_TEXT_ANTIALIAS_LCD_HRGB :
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