зеркало из https://github.com/mono/ikvm-fork.git
Implements isNonSimpleChar(); sort the method like the sun Class for easer merging; copy some Java documentation
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7078903c13
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@ -1,5 +1,30 @@
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/*
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Copyright (C) 2009, 2010 Volker Berlin (i-net software)
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* Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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Copyright (C) 2009 - 2011 Volker Berlin (i-net software)
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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@ -21,13 +46,10 @@
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jeroen@frijters.net
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*/
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package sun.font;
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import ikvm.awt.IkvmToolkit;
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import java.awt.Font;
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import java.awt.Toolkit;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.Locale;
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import java.util.concurrent.ConcurrentHashMap;
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@ -37,15 +59,19 @@ import javax.swing.plaf.FontUIResource;
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import cli.System.Drawing.FontFamily;
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import ikvm.internal.NotYetImplementedError;
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/**
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*
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/*
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* Interface between Java Fonts (java.awt.Font) and the underlying
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* font files/native font resources and the Java and native font scalers.
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*/
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public class FontManager{
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public final class FontManager {
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public static final int NO_FALLBACK = 0;
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public static final int PHYSICAL_FALLBACK = 1;
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public static final int LOGICAL_FALLBACK = 2;
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/* deprecated, unsupported hack - actually invokes a bug! */
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private static boolean usePlatformFontMetrics = false;
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private static ConcurrentHashMap<String, Font2D> fontNameCache = new ConcurrentHashMap<String, Font2D>();
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private static final Method getFont2D;
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@ -60,7 +86,77 @@ public class FontManager{
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}
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}
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/* Revise the implementation to in fact mean "font is a composite font.
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* This ensures that Swing components will always benefit from the
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* fall back fonts
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*/
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public static boolean fontSupportsDefaultEncoding(Font font) {
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// In Java the font must be a instanceof CompositeFont
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// because .NET fonts are all already Composite Fonts (I think) that we can return true
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// and does not need to implements CompositeFont
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return true;
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}
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/**
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* This method is provided for internal and exclusive use by Swing.
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*
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* It may be used in conjunction with fontSupportsDefaultEncoding(Font)
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* In the event that a desktop properties font doesn't directly
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* support the default encoding, (ie because the host OS supports
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* adding support for the current locale automatically for native apps),
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* then Swing calls this method to get a font which uses the specified
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* font for the code points it covers, but also supports this locale
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* just as the standard composite fonts do.
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* Note: this will over-ride any setting where an application
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* specifies it prefers locale specific composite fonts.
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* The logic for this, is that this method is used only where the user or
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* application has specified that the native L&F be used, and that
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* we should honour that request to use the same font as native apps use.
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*
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* The behaviour of this method is to construct a new composite
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* Font object that uses the specified physical font as its first
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* component, and adds all the components of "dialog" as fall back
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* components.
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* The method currently assumes that only the size and style attributes
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* are set on the specified font. It doesn't copy the font transform or
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* other attributes because they aren't set on a font created from
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* the desktop. This will need to be fixed if use is broadened.
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*
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* Operations such as Font.deriveFont will work properly on the
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* font returned by this method for deriving a different point size.
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* Additionally it tries to support a different style by calling
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* getNewComposite() below. That also supports replacing slot zero
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* with a different physical font but that is expected to be "rare".
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* Deriving with a different style is needed because its been shown
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* that some applications try to do this for Swing FontUIResources.
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* Also operations such as new Font(font.getFontName(..), Font.PLAIN, 14);
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* will NOT yield the same result, as the new underlying CompositeFont
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* cannot be "looked up" in the font registry.
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* This returns a FontUIResource as that is the Font sub-class needed
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* by Swing.
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* Suggested usage is something like :
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* FontUIResource fuir;
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* Font desktopFont = getDesktopFont(..);
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* // NOTE even if fontSupportsDefaultEncoding returns true because
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* // you get Tahoma and are running in an English locale, you may
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* // still want to just call getCompositeFontUIResource() anyway
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* // as only then will you get fallback fonts - eg for CJK.
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* if (FontManager.fontSupportsDefaultEncoding(desktopFont)) {
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* fuir = new FontUIResource(..);
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* } else {
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* fuir = FontManager.getCompositeFontUIResource(desktopFont);
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* }
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* return fuir;
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*/
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public static FontUIResource getCompositeFontUIResource(Font font) {
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throw new NotYetImplementedError();
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}
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public static Font2D getNewComposite(String family, int style, Font2D handle) {
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throw new NotYetImplementedError();
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}
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/*
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* return String representation of style prepended with "."
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* This is useful for performance to avoid unnecessary string operations.
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*/
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@ -77,7 +173,7 @@ public class FontManager{
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}
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}
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/**
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/*
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* The client supplies a name and a style.
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* The name could be a family name, or a full name.
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* A font may exist with the specified style, or it may
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@ -110,9 +206,9 @@ public class FontManager{
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return new PhysicalFont( family, style );
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}
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/** This method can be more efficient as it will only need to
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/* This method can be more efficient as it will only need to
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* do the lookup once, and subsequent calls on the java.awt.Font
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* instance can utilize the cached Font2D on that object.
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* instance can utilise the cached Font2D on that object.
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* Its unfortunate it needs to be a native method, but the font2D
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* variable has to be private.
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*/
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@ -124,56 +220,51 @@ public class FontManager{
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}
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}
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public static boolean isComplexText(char[] text, int start, int limit){
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/* Stuff below was in NativeFontWrapper and needed a new home */
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/*
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* Workaround for apps which are dependent on a font metrics bug
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* in JDK 1.1. This is an unsupported win32 private setting.
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*/
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public static boolean usePlatformFontMetrics() {
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return usePlatformFontMetrics;
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}
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/* This method doesn't check if alternates are selected in this app
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* context. Its used by the FontMetrics caching code which in such
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* a case cannot retrieve a cached metrics solely on the basis of
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* the Font.equals() method since it needs to also check if the Font2D
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* is the same.
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* We also use non-standard composites for Swing native L&F fonts on
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* Windows. In that case the policy is that the metrics reported are
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* based solely on the physical font in the first slot which is the
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* visible java.awt.Font. So in that case the metrics cache which tests
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* the Font does what we want. In the near future when we expand the GTK
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* logical font definitions we may need to revisit this if GTK reports
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* combined metrics instead. For now though this test can be simple.
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*/
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static boolean maybeUsingAlternateCompositeFonts() {
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// TODO Auto-generated method stub
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return false;
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}
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public static boolean maybeUsingAlternateCompositeFonts(){
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// TODO Auto-generated method stub
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return false;
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}
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public static boolean isNonSimpleChar(char ch){
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// TODO Auto-generated method stub
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return false;
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}
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public static boolean fontSupportsDefaultEncoding(Font f){
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// In Java the font must be a instanceof CompositeFont
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// because .NET fonts are all already Composite Fonts (I think) that we can return true
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// and does not need to implements CompositeFont
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return true;
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}
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public static Font getCompositeFontUIResource(Font f){
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throw new NotYetImplementedError();
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}
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public static boolean registerFont(Font font){
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// TODO Auto-generated method stub
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return false;
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}
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public static void preferLocaleFonts(){
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public static synchronized void preferLocaleFonts() {
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// TODO Auto-generated method stub
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}
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public static void preferProportionalFonts(){
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public static synchronized void preferProportionalFonts() {
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// TODO Auto-generated method stub
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}
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public static boolean usePlatformFontMetrics(){
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public static boolean registerFont(Font font) {
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/* This method should not be called with "null".
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* It is the caller's responsibility to ensure that.
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*/
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// TODO Auto-generated method stub
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return false;
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}
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public static Font2D getNewComposite(Object object, int style, Font2D font2D){
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throw new NotYetImplementedError();
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}
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/* This is called by Swing passing in a fontconfig family name
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* such as "sans". In return Swing gets a FontUIResource instance
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* that has queried fontconfig to resolve the font(s) used for this.
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@ -195,4 +286,153 @@ public class FontManager{
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return new FontUIResource( fcFamily, style, size );
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}
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/* The following fields and methods which relate to layout
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* perhaps belong in some other class but FontManager is already
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* widely used as an entry point for other JDK code that needs
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* access to the font system internals.
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*/
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/**
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* Referenced by code in the JDK which wants to test for the
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* minimum char code for which layout may be required.
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* Note that even basic latin text can benefit from ligatures,
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* eg "ffi" but we presently apply those only if explicitly
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* requested with TextAttribute.LIGATURES_ON.
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* The value here indicates the lowest char code for which failing
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* to invoke layout would prevent acceptable rendering.
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*/
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public static final int MIN_LAYOUT_CHARCODE = 0x0300;
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/**
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* Referenced by code in the JDK which wants to test for the
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* maximum char code for which layout may be required.
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* Note this does not account for supplementary characters
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* where the caller interprets 'layout' to mean any case where
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* one 'char' (ie the java type char) does not map to one glyph
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*/
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public static final int MAX_LAYOUT_CHARCODE = 0x206F;
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/* If the character code falls into any of a number of unicode ranges
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* where we know that simple left->right layout mapping chars to glyphs
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* 1:1 and accumulating advances is going to produce incorrect results,
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* we want to know this so the caller can use a more intelligent layout
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* approach. A caller who cares about optimum performance may want to
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* check the first case and skip the method call if its in that range.
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* Although there's a lot of tests in here, knowing you can skip
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* CTL saves a great deal more. The rest of the checks are ordered
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* so that rather than checking explicitly if (>= start & <= end)
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* which would mean all ranges would need to be checked so be sure
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* CTL is not needed, the method returns as soon as it recognises
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* the code point is outside of a CTL ranges.
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* NOTE: Since this method accepts an 'int' it is asssumed to properly
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* represent a CHARACTER. ie it assumes the caller has already
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* converted surrogate pairs into supplementary characters, and so
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* can handle this case and doesn't need to be told such a case is
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* 'complex'.
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*/
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static boolean isComplexCharCode(int code) {
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if (code < MIN_LAYOUT_CHARCODE || code > MAX_LAYOUT_CHARCODE) {
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return false;
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}
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else if (code <= 0x036f) {
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// Trigger layout for combining diacriticals 0x0300->0x036f
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return true;
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}
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else if (code < 0x0590) {
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// No automatic layout for Greek, Cyrillic, Armenian.
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return false;
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}
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else if (code <= 0x06ff) {
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// Hebrew 0590 - 05ff
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// Arabic 0600 - 06ff
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return true;
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}
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else if (code < 0x0900) {
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return false; // Syriac and Thaana
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}
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else if (code <= 0x0e7f) {
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// if Indic, assume shaping for conjuncts, reordering:
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// 0900 - 097F Devanagari
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// 0980 - 09FF Bengali
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// 0A00 - 0A7F Gurmukhi
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// 0A80 - 0AFF Gujarati
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// 0B00 - 0B7F Oriya
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// 0B80 - 0BFF Tamil
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// 0C00 - 0C7F Telugu
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// 0C80 - 0CFF Kannada
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// 0D00 - 0D7F Malayalam
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// 0D80 - 0DFF Sinhala
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// 0E00 - 0E7F if Thai, assume shaping for vowel, tone marks
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return true;
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}
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else if (code < 0x1780) {
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return false;
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}
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else if (code <= 0x17ff) { // 1780 - 17FF Khmer
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return true;
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}
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else if (code < 0x200c) {
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return false;
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}
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else if (code <= 0x200d) { // zwj or zwnj
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return true;
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}
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else if (code >= 0x202a && code <= 0x202e) { // directional control
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return true;
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}
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else if (code >= 0x206a && code <= 0x206f) { // directional control
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return true;
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}
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return false;
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}
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/* This is almost the same as the method above, except it takes a
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* char which means it may include undecoded surrogate pairs.
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* The distinction is made so that code which needs to identify all
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* cases in which we do not have a simple mapping from
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* char->unicode character->glyph can be be identified.
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* For example measurement cannot simply sum advances of 'chars',
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* the caret in editable text cannot advance one 'char' at a time, etc.
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* These callers really are asking for more than whether 'layout'
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* needs to be run, they need to know if they can assume 1->1
|
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* char->glyph mapping.
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*/
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static boolean isNonSimpleChar(char ch) {
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return
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isComplexCharCode(ch) ||
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(ch >= CharToGlyphMapper.HI_SURROGATE_START &&
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ch <= CharToGlyphMapper.LO_SURROGATE_END);
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}
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/**
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* If there is anything in the text which triggers a case
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* where char->glyph does not map 1:1 in straightforward
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* left->right ordering, then this method returns true.
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* Scripts which might require it but are not treated as such
|
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* due to JDK implementations will not return true.
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* ie a 'true' return is an indication of the treatment by
|
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* the implementation.
|
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* Whether supplementary characters should be considered is dependent
|
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* on the needs of the caller. Since this method accepts the 'char' type
|
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* then such chars are always represented by a pair. From a rendering
|
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* perspective these will all (in the cases I know of) still be one
|
||||
* unicode character -> one glyph. But if a caller is using this to
|
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* discover any case where it cannot make naive assumptions about
|
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* the number of chars, and how to index through them, then it may
|
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* need the option to have a 'true' return in such a case.
|
||||
*/
|
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public static boolean isComplexText(char [] chs, int start, int limit) {
|
||||
|
||||
for (int i = start; i < limit; i++) {
|
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if (chs[i] < MIN_LAYOUT_CHARCODE) {
|
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continue;
|
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}
|
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else if (isNonSimpleChar(chs[i])) {
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return true;
|
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}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
}
|
||||
|
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