JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1997, 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.java2d;

import java.awt.AWTError;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.font.TextAttribute;
import java.awt.image.BufferedImage;
import java.awt.peer.ComponentPeer;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FilenameFilter;
import java.io.InputStreamReader;
import java.io.IOException;
import java.text.AttributedCharacterIterator;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.Vector;
import java.util.concurrent.ConcurrentHashMap;
import sun.awt.AppContext;
import sun.awt.DisplayChangedListener;
import sun.awt.FontConfiguration;
import sun.awt.SunDisplayChanger;
import sun.font.CompositeFontDescriptor;
import sun.font.Font2D;
import sun.font.FontManager;
import sun.font.FontManagerFactory;
import sun.font.FontManagerForSGE;
import sun.font.NativeFont;

/**
 * This is an implementation of a GraphicsEnvironment object for the
 * default local GraphicsEnvironment.
 *
 * @see GraphicsDevice
 * @see GraphicsConfiguration
 */
public abstract class SunGraphicsEnvironment extends GraphicsEnvironment
    implements DisplayChangedListener {

    public static boolean isOpenSolaris;
    private static Font defaultFont;

    public SunGraphicsEnvironment() {
        java.security.AccessController.doPrivileged(
                                    new java.security.PrivilegedAction() {
            public Object run() {
                    String version = System.getProperty("os.version", "0.0");
                    try {
                        float ver = Float.parseFloat(version);
                        if (ver > 5.10f) {
                            File f = new File("/etc/release");
                            FileInputStream fis = new FileInputStream(f);
                            InputStreamReader isr
                                = new InputStreamReader(fis, "ISO-8859-1");
                            BufferedReader br = new BufferedReader(isr);
                            String line = br.readLine();
                            if (line.indexOf("OpenSolaris") >= 0) {
                                isOpenSolaris = true;
                            } else {
                                /* We are using isOpenSolaris as meaning
                                 * we know the Solaris commercial fonts aren't
                                 * present. "Solaris Next" (03/10) did not
                                 * include these even though its was not
                                 * OpenSolaris. Need to revisit how this is
                                 * handled but for now as in 6ux, we'll use
                                 * the test for a standard font resource as
                                 * being an indicator as to whether we need
                                 * to treat this as OpenSolaris from a font
                                 * config perspective.
                                 */
                                String courierNew =
                                    "/usr/openwin/lib/X11/fonts/TrueType/CourierNew.ttf";
                                File courierFile = new File(courierNew);
                                isOpenSolaris = !courierFile.exists();
                            }
                            fis.close();
                        }
                    } catch (Exception e) {
                    }

                /* Establish the default font to be used by SG2D etc */
                defaultFont = new Font(Font.DIALOG, Font.PLAIN, 12);

                return null;
            }
        });
    }

    protected GraphicsDevice[] screens;

    /**
     * Returns an array of all of the screen devices.
     */
    public synchronized GraphicsDevice[] getScreenDevices() {
        GraphicsDevice[] ret = screens;
        if (ret == null) {
            int num = getNumScreens();
            ret = new GraphicsDevice[num];
            for (int i = 0; i < num; i++) {
                ret[i] = makeScreenDevice(i);
            }
            screens = ret;
        }
        return ret;
    }

    /**
     * Returns the number of screen devices of this graphics environment.
     *
     * @return the number of screen devices of this graphics environment
     */
    protected abstract int getNumScreens();

    /**
     * Create and return the screen device with the specified number. The
     * device with number <code>0</code> will be the default device (returned
     * by {@link #getDefaultScreenDevice()}.
     *
     * @param screennum the number of the screen to create
     *
     * @return the created screen device
     */
    protected abstract GraphicsDevice makeScreenDevice(int screennum);

    /**
     * Returns the default screen graphics device.
     */
    public GraphicsDevice getDefaultScreenDevice() {
        GraphicsDevice[] screens = getScreenDevices();
        if (screens.length == 0) {
            throw new AWTError("no screen devices");
        }
        return screens[0];
    }

    /**
     * Returns a Graphics2D object for rendering into the
     * given BufferedImage.
     * @throws NullPointerException if BufferedImage argument is null
     */
    public Graphics2D createGraphics(BufferedImage img) {
        if (img == null) {
            throw new NullPointerException("BufferedImage cannot be null");
        }
        SurfaceData sd = SurfaceData.getPrimarySurfaceData(img);
        return new SunGraphics2D(sd, Color.white, Color.black, defaultFont);
    }

    public static FontManagerForSGE getFontManagerForSGE() {
        FontManager fm = FontManagerFactory.getInstance();
        return (FontManagerForSGE) fm;
    }

    /* Modifies the behaviour of a subsequent call to preferLocaleFonts()
     * to use Mincho instead of Gothic for dialoginput in JA locales
     * on windows. Not needed on other platforms.
     *
     * DO NOT MOVE OR RENAME OR OTHERWISE ALTER THIS METHOD.
     * ITS USED BY SOME NON-JRE INTERNAL CODE.
     */
    public static void useAlternateFontforJALocales() {
        getFontManagerForSGE().useAlternateFontforJALocales();
    }

     /**
     * Returns all fonts available in this environment.
     */
    public Font[] getAllFonts() {
        FontManagerForSGE fm = getFontManagerForSGE();
        Font[] installedFonts = fm.getAllInstalledFonts();
        Font[] created = fm.getCreatedFonts();
        if (created == null || created.length == 0) {
            return installedFonts;
        } else {
            int newlen = installedFonts.length + created.length;
            Font [] fonts = java.util.Arrays.copyOf(installedFonts, newlen);
            System.arraycopy(created, 0, fonts,
                             installedFonts.length, created.length);
            return fonts;
        }
    }

    public String[] getAvailableFontFamilyNames(Locale requestedLocale) {
        FontManagerForSGE fm = getFontManagerForSGE();
        String[] installed = fm.getInstalledFontFamilyNames(requestedLocale);
        /* Use a new TreeMap as used in getInstalledFontFamilyNames
         * and insert all the keys in lower case, so that the sort order
         * is the same as the installed families. This preserves historical
         * behaviour and inserts new families in the right place.
         * It would have been marginally more efficient to directly obtain
         * the tree map and just insert new entries, but not so much as
         * to justify the extra internal interface.
         */
        TreeMap<String, String> map = fm.getCreatedFontFamilyNames();
        if (map == null || map.size() == 0) {
            return installed;
        } else {
            for (int i=0; i<installed.length; i++) {
                map.put(installed[i].toLowerCase(requestedLocale),
                        installed[i]);
            }
            String[] retval =  new String[map.size()];
            Object [] keyNames = map.keySet().toArray();
            for (int i=0; i < keyNames.length; i++) {
                retval[i] = (String)map.get(keyNames[i]);
            }
            return retval;
        }
    }

    public String[] getAvailableFontFamilyNames() {
        return getAvailableFontFamilyNames(Locale.getDefault());
    }

    /**
     * Return the bounds of a GraphicsDevice, less its screen insets.
     * See also java.awt.GraphicsEnvironment.getUsableBounds();
     */
    public static Rectangle getUsableBounds(GraphicsDevice gd) {
        GraphicsConfiguration gc = gd.getDefaultConfiguration();
        Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc);
        Rectangle usableBounds = gc.getBounds();

        usableBounds.x += insets.left;
        usableBounds.y += insets.top;
        usableBounds.width -= (insets.left + insets.right);
        usableBounds.height -= (insets.top + insets.bottom);

        return usableBounds;
    }

    /**
     * From the DisplayChangedListener interface; called
     * when the display mode has been changed.
     */
    public void displayChanged() {
        // notify screens in device array to do display update stuff
        for (GraphicsDevice gd : getScreenDevices()) {
            if (gd instanceof DisplayChangedListener) {
                ((DisplayChangedListener) gd).displayChanged();
            }
        }

        // notify SunDisplayChanger list (e.g. VolatileSurfaceManagers and
        // SurfaceDataProxies) about the display change event
        displayChanger.notifyListeners();
    }

    /**
     * Part of the DisplayChangedListener interface:
     * propagate this event to listeners
     */
    public void paletteChanged() {
        displayChanger.notifyPaletteChanged();
    }

    /**
     * Returns true when the display is local, false for remote displays.
     *

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