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SunToolkit.java
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SunToolkit.java
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/*
* Copyright (c) 1997, 2021, 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.AWTEvent;
import java.awt.AWTException;
import java.awt.Button;
import java.awt.Canvas;
import java.awt.Checkbox;
import java.awt.Choice;
import java.awt.Component;
import java.awt.Container;
import java.awt.DefaultKeyboardFocusManager;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FocusTraversalPolicy;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.KeyboardFocusManager;
import java.awt.Label;
import java.awt.MenuComponent;
import java.awt.Panel;
import java.awt.RenderingHints;
import java.awt.ScrollPane;
import java.awt.Scrollbar;
import java.awt.SystemTray;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.Window;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.image.MultiResolutionImage;
import java.awt.image.Raster;
import java.awt.peer.FramePeer;
import java.awt.peer.KeyboardFocusManagerPeer;
import java.awt.peer.SystemTrayPeer;
import java.awt.peer.TrayIconPeer;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.security.AccessController;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.Vector;
import java.util.WeakHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
import sun.awt.im.InputContext;
import sun.awt.image.ByteArrayImageSource;
import sun.awt.image.FileImageSource;
import sun.awt.image.ImageRepresentation;
import sun.awt.image.MultiResolutionToolkitImage;
import sun.awt.image.ToolkitImage;
import sun.awt.image.URLImageSource;
import sun.font.FontDesignMetrics;
import sun.net.util.URLUtil;
import sun.security.action.GetBooleanAction;
import sun.security.action.GetPropertyAction;
import sun.util.logging.PlatformLogger;
import static java.awt.RenderingHints.KEY_TEXT_ANTIALIASING;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_GASP;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HBGR;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_VBGR;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_VRGB;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_ON;
public abstract class SunToolkit extends Toolkit
implements ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
// 8014718: logging has been removed from SunToolkit
/* Load debug settings for native code */
static {
if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
DebugSettings.init();
}
touchKeyboardAutoShowIsEnabled = Boolean.valueOf(
GetPropertyAction.privilegedGetProperty(
"awt.touchKeyboardAutoShowIsEnabled", "true"));
};
/**
* Special mask for the UngrabEvent events, in addition to the
* public masks defined in AWTEvent. Should be used as the mask
* value for Toolkit.addAWTEventListener.
*/
public static final int GRAB_EVENT_MASK = 0x80000000;
/* The key to put()/get() the PostEventQueue into/from the AppContext.
*/
private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
/**
* Number of buttons.
* By default it's taken from the system. If system value does not
* fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
*/
protected static int numberOfButtons = 0;
/* XFree standard mention 24 buttons as maximum:
* http://www.xfree86.org/current/mouse.4.html
* We workaround systems supporting more than 24 buttons.
* Otherwise, we have to use long type values as masks
* which leads to API change.
* InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
* the 4-bytes limit for the int type. (CR 6799099)
* One more bit is reserved for FIRST_HIGH_BIT.
*/
public static final int MAX_BUTTONS_SUPPORTED = 20;
/**
* Creates and initializes EventQueue instance for the specified
* AppContext.
* Note that event queue must be created from createNewAppContext()
* only in order to ensure that EventQueue constructor obtains
* the correct AppContext.
* @param appContext AppContext to associate with the event queue
*/
private static void initEQ(AppContext appContext) {
EventQueue eventQueue = new EventQueue();
appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
}
public SunToolkit() {
}
public boolean useBufferPerWindow() {
return false;
}
public abstract FramePeer createLightweightFrame(LightweightFrame target)
throws HeadlessException;
public abstract TrayIconPeer createTrayIcon(TrayIcon target)
throws HeadlessException, AWTException;
public abstract SystemTrayPeer createSystemTray(SystemTray target);
public abstract boolean isTraySupported();
@Override
public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
throws HeadlessException;
/**
* The AWT lock is typically only used on Unix platforms to synchronize
* access to Xlib, OpenGL, etc. However, these methods are implemented
* in SunToolkit so that they can be called from shared code (e.g.
* from the OGL pipeline) or from the X11 pipeline regardless of whether
* XToolkit or MToolkit is currently in use. There are native macros
* (such as AWT_LOCK) defined in awt.h, so if the implementation of these
* methods is changed, make sure it is compatible with the native macros.
*
* Note: The following methods (awtLock(), awtUnlock(), etc) should be
* used in place of:
* synchronized (getAWTLock()) {
* ...
* }
*
* By factoring these methods out specially, we are able to change the
* implementation of these methods (e.g. use more advanced locking
* mechanisms) without impacting calling code.
*
* Sample usage:
* private void doStuffWithXlib() {
* assert !SunToolkit.isAWTLockHeldByCurrentThread();
* SunToolkit.awtLock();
* try {
* ...
* XlibWrapper.XDoStuff();
* } finally {
* SunToolkit.awtUnlock();
* }
* }
*/
private static final ReentrantLock AWT_LOCK = new ReentrantLock();
private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
public static final void awtLock() {
AWT_LOCK.lock();
}
public static final boolean awtTryLock() {
return AWT_LOCK.tryLock();
}
public static final void awtUnlock() {
AWT_LOCK.unlock();
}
public static final void awtLockWait()
throws InterruptedException
{
AWT_LOCK_COND.await();
}
public static final void awtLockWait(long timeout)
throws InterruptedException
{
AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
}
public static final void awtLockNotify() {
AWT_LOCK_COND.signal();
}
public static final void awtLockNotifyAll() {
AWT_LOCK_COND.signalAll();
}
public static final boolean isAWTLockHeldByCurrentThread() {
return AWT_LOCK.isHeldByCurrentThread();
}
/*
* Create a new AppContext, along with its EventQueue, for a
* new ThreadGroup. Browser code, for example, would use this
* method to create an AppContext & EventQueue for an Applet.
*/
public static AppContext createNewAppContext() {
ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
return createNewAppContext(threadGroup);
}
static final AppContext createNewAppContext(ThreadGroup threadGroup) {
// Create appContext before initialization of EventQueue, so all
// the calls to AppContext.getAppContext() from EventQueue ctor
// return correct values
AppContext appContext = new AppContext(threadGroup);
initEQ(appContext);
return appContext;
}
static void wakeupEventQueue(EventQueue q, boolean isShutdown){
AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
}
/*
* Fetch the peer associated with the given target (as specified
* in the peer creation method). This can be used to determine
* things like what the parent peer is. If the target is null
* or the target can't be found (either because the a peer was
* never created for it or the peer was disposed), a null will
* be returned.
*/
protected static Object targetToPeer(Object target) {
if (target != null && !GraphicsEnvironment.isHeadless()) {
return AWTAutoShutdown.getInstance().getPeer(target);
}
return null;
}
protected static void targetCreatedPeer(Object target, Object peer) {
if (target != null && peer != null &&
!GraphicsEnvironment.isHeadless())
{
AWTAutoShutdown.getInstance().registerPeer(target, peer);
}
}
protected static void targetDisposedPeer(Object target, Object peer) {
if (target != null && peer != null &&
!GraphicsEnvironment.isHeadless())
{
AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
}
}
// Maps from non-Component/MenuComponent to AppContext.
// WeakHashMap<Component,AppContext>
private static final Map<Object, AppContext> appContextMap =
Collections.synchronizedMap(new WeakIdentityHashMap<Object, AppContext>());
/**
* Sets the appContext field of target. If target is not a Component or
* MenuComponent, this returns false.
*/
private static boolean setAppContext(Object target,
AppContext context) {
if (target instanceof Component) {
AWTAccessor.getComponentAccessor().
setAppContext((Component)target, context);
} else if (target instanceof MenuComponent) {
AWTAccessor.getMenuComponentAccessor().
setAppContext((MenuComponent)target, context);
} else {
return false;
}
return true;
}
/**
* Returns the appContext field for target. If target is not a
* Component or MenuComponent this returns null.
*/
private static AppContext getAppContext(Object target) {
if (target instanceof Component) {
return AWTAccessor.getComponentAccessor().
getAppContext((Component)target);
} else if (target instanceof MenuComponent) {
return AWTAccessor.getMenuComponentAccessor().
getAppContext((MenuComponent)target);
} else {
return null;
}
}
/*
* Fetch the AppContext associated with the given target.
* This can be used to determine things like which EventQueue
* to use for posting events to a Component. If the target is
* null or the target can't be found, a null with be returned.
*/
public static AppContext targetToAppContext(Object target) {
if (target == null) {
return null;
}
AppContext context = getAppContext(target);
if (context == null) {
// target is not a Component/MenuComponent, try the
// appContextMap.
context = appContextMap.get(target);
}
return context;
}
/**
* Sets the synchronous status of focus requests on lightweight
* components in the specified window to the specified value.
* If the boolean parameter is {@code true} then the focus
* requests on lightweight components will be performed
* synchronously, if it is {@code false}, then asynchronously.
* By default, all windows have their lightweight request status
* set to asynchronous.
* <p>
* The application can only set the status of lightweight focus
* requests to synchronous for any of its windows if it doesn't
* perform focus transfers between different heavyweight containers.
* In this case the observable focus behaviour is the same as with
* asynchronous status.
* <p>
* If the application performs focus transfer between different
* heavyweight containers and sets the lightweight focus request
* status to synchronous for any of its windows, then further focus
* behaviour is unspecified.
* <p>
* @param changed the window for which the lightweight focus request
* status should be set
* @param status the value of lightweight focus request status
*/
public static void setLWRequestStatus(Window changed,boolean status){
AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
};
public static void checkAndSetPolicy(Container cont) {
FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
getCurrentKeyboardFocusManager().
getDefaultFocusTraversalPolicy();
cont.setFocusTraversalPolicy(defaultPolicy);
}
/*
* Insert a mapping from target to AppContext, for later retrieval
* via targetToAppContext() above.
*/
public static void insertTargetMapping(Object target, AppContext appContext) {
if (!setAppContext(target, appContext)) {
// Target is not a Component/MenuComponent, use the private Map
// instead.
appContextMap.put(target, appContext);
}
}
/*
* Post an AWTEvent to the Java EventQueue, using the PostEventQueue
* to avoid possibly calling client code (EventQueueSubclass.postEvent())
* on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
* not be called under another lock since it locks the EventQueue.
* See bugids 4632918, 4526597.
*/
public static void postEvent(AppContext appContext, AWTEvent event) {
if (event == null) {
throw new NullPointerException();
}
AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
if (sea != null && sea.isSequencedEvent(event)) {
AWTEvent nested = sea.getNested(event);
if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
nested instanceof TimedWindowEvent)
{
TimedWindowEvent twe = (TimedWindowEvent)nested;
((SunToolkit)Toolkit.getDefaultToolkit()).
setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
}
}
// All events posted via this method are system-generated.
// Placing the following call here reduces considerably the
// number of places throughout the toolkit that would
// otherwise have to be modified to precisely identify
// system-generated events.
setSystemGenerated(event);
AppContext eventContext = targetToAppContext(event.getSource());
if (eventContext != null && !eventContext.equals(appContext)) {
throw new RuntimeException("Event posted on wrong app context : " + event);
}
PostEventQueue postEventQueue =
(PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
if (postEventQueue != null) {
postEventQueue.postEvent(event);
}
}
/*
* Post AWTEvent of high priority.
*/
public static void postPriorityEvent(final AWTEvent e) {
PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
@Override
public void run() {
AWTAccessor.getAWTEventAccessor().setPosted(e);
((Component)e.getSource()).dispatchEvent(e);
}
}, PeerEvent.ULTIMATE_PRIORITY_EVENT);
postEvent(targetToAppContext(e.getSource()), pe);
}
/*
* Flush any pending events which haven't been posted to the AWT
* EventQueue yet.
*/
public static void flushPendingEvents() {
AppContext appContext = AppContext.getAppContext();
flushPendingEvents(appContext);
}
/*
* Flush the PostEventQueue for the right AppContext.
* The default flushPendingEvents only flushes the thread-local context,
* which is not always correct, c.f. 3746956
*/
public static void flushPendingEvents(AppContext appContext) {
PostEventQueue postEventQueue =
(PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
if (postEventQueue != null) {
postEventQueue.flush();
}
}
/*
* Execute a chunk of code on the Java event handler thread for the
* given target. Does not wait for the execution to occur before
* returning to the caller.
*/
public static void executeOnEventHandlerThread(Object target,
Runnable runnable) {
executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
}
/*
* Fixed 5064013: the InvocationEvent time should be equals
* the time of the ActionEvent
*/
@SuppressWarnings("serial")
public static void executeOnEventHandlerThread(Object target,
Runnable runnable,
final long when) {
executeOnEventHandlerThread(
new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
@Override
public long getWhen() {
return when;
}
});
}
/*
* Execute a chunk of code on the Java event handler thread for the
* given target. Does not wait for the execution to occur before
* returning to the caller.
*/
public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
}
/*
* Execute a chunk of code on the Java event handler thread. The
* method takes into account provided AppContext and sets
* {@code SunToolkit.getDefaultToolkit()} as a target of the
* event. See 6451487 for detailes.
* Does not wait for the execution to occur before returning to
* the caller.
*/
public static void invokeLaterOnAppContext(
AppContext appContext, Runnable dispatcher)
{
postEvent(appContext,
new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
PeerEvent.PRIORITY_EVENT));
}
/*
* Execute a chunk of code on the Java event handler thread for the
* given target. Waits for the execution to occur before returning
* to the caller.
*/
public static void executeOnEDTAndWait(Object target, Runnable runnable)
throws InterruptedException, InvocationTargetException
{
if (EventQueue.isDispatchThread()) {
throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
}
class AWTInvocationLock {}
Object lock = new AWTInvocationLock();
PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
synchronized (lock) {
executeOnEventHandlerThread(event);
while(!event.isDispatched()) {
lock.wait();
}
}
Throwable eventThrowable = event.getThrowable();
if (eventThrowable != null) {
throw new InvocationTargetException(eventThrowable);
}
}
/*
* Returns true if the calling thread is the event dispatch thread
* contained within AppContext which associated with the given target.
* Use this call to ensure that a given task is being executed
* (or not being) on the event dispatch thread for the given target.
*/
public static boolean isDispatchThreadForAppContext(Object target) {
AppContext appContext = targetToAppContext(target);
EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
return accessor.isDispatchThreadImpl(eq);
}
@Override
public Dimension getScreenSize() {
return GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice().getDefaultConfiguration()
.getBounds().getSize();
}
@Override
public ColorModel getColorModel() throws HeadlessException {
return GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice().getDefaultConfiguration()
.getColorModel();
}
@Override
@SuppressWarnings("deprecation")
public FontMetrics getFontMetrics(Font font) {
return FontDesignMetrics.getMetrics(font);
}
@Override
@SuppressWarnings("deprecation")
public String[] getFontList() {
String[] hardwiredFontList = {
Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
Font.DIALOG_INPUT
// -- Obsolete font names from 1.0.2. It was decided that
// -- getFontList should not return these old names:
// "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
};
return hardwiredFontList;
}
/**
* Disables erasing of background on the canvas before painting if
* this is supported by the current toolkit. It is recommended to
* call this method early, before the Canvas becomes displayable,
* because some Toolkit implementations do not support changing
* this property once the Canvas becomes displayable.
*/
public void disableBackgroundErase(Canvas canvas) {
disableBackgroundEraseImpl(canvas);
}
/**
* Disables the native erasing of the background on the given
* component before painting if this is supported by the current
* toolkit. This only has an effect for certain components such as
* Canvas, Panel and Window. It is recommended to call this method
* early, before the Component becomes displayable, because some
* Toolkit implementations do not support changing this property
* once the Component becomes displayable.
*/
public void disableBackgroundErase(Component component) {
disableBackgroundEraseImpl(component);
}
private void disableBackgroundEraseImpl(Component component) {
AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
}
/**
* Returns the value of "sun.awt.noerasebackground" property. Default
* value is {@code false}.
*/
public static boolean getSunAwtNoerasebackground() {
return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
}
/**
* Returns the value of "sun.awt.erasebackgroundonresize" property. Default
* value is {@code false}.
*/
public static boolean getSunAwtErasebackgroundonresize() {
return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
}
@SuppressWarnings("deprecation")
static final SoftCache fileImgCache = new SoftCache();
@SuppressWarnings("deprecation")
static final SoftCache urlImgCache = new SoftCache();
static Image getImageFromHash(Toolkit tk, URL url) {
checkPermissions(url);
synchronized (urlImgCache) {
String key = url.toString();
Image img = (Image)urlImgCache.get(key);
if (img == null) {
try {
img = tk.createImage(new URLImageSource(url));
urlImgCache.put(key, img);
} catch (Exception e) {
}
}
return img;
}
}
static Image getImageFromHash(Toolkit tk,
String filename) {
checkPermissions(filename);
synchronized (fileImgCache) {
Image img = (Image)fileImgCache.get(filename);
if (img == null) {
try {
img = tk.createImage(new FileImageSource(filename));
fileImgCache.put(filename, img);
} catch (Exception e) {
}
}
return img;
}
}
@Override
public Image getImage(String filename) {
return getImageFromHash(this, filename);
}
@Override
public Image getImage(URL url) {
return getImageFromHash(this, url);
}
protected Image getImageWithResolutionVariant(String fileName,
String resolutionVariantName) {
synchronized (fileImgCache) {
Image image = getImageFromHash(this, fileName);
if (image instanceof MultiResolutionImage) {
return image;
}
Image resolutionVariant = getImageFromHash(this, resolutionVariantName);
image = createImageWithResolutionVariant(image, resolutionVariant);
fileImgCache.put(fileName, image);
return image;
}
}
protected Image getImageWithResolutionVariant(URL url,
URL resolutionVariantURL) {
synchronized (urlImgCache) {
Image image = getImageFromHash(this, url);
if (image instanceof MultiResolutionImage) {
return image;
}
Image resolutionVariant = getImageFromHash(this, resolutionVariantURL);
image = createImageWithResolutionVariant(image, resolutionVariant);
String key = url.toString();
urlImgCache.put(key, image);
return image;
}
}
@Override
public Image createImage(String filename) {
checkPermissions(filename);
return createImage(new FileImageSource(filename));
}
@Override
public Image createImage(URL url) {
checkPermissions(url);
return createImage(new URLImageSource(url));
}
@Override
public Image createImage(byte[] data, int offset, int length) {
return createImage(new ByteArrayImageSource(data, offset, length));
}
@Override
public Image createImage(ImageProducer producer) {
return new ToolkitImage(producer);
}
public static Image createImageWithResolutionVariant(Image image,
Image resolutionVariant) {
return new MultiResolutionToolkitImage(image, resolutionVariant);
}
@Override
public int checkImage(Image img, int w, int h, ImageObserver o) {
if (!(img instanceof ToolkitImage)) {
return ImageObserver.ALLBITS;
}
ToolkitImage tkimg = (ToolkitImage)img;
int repbits;
if (w == 0 || h == 0) {
repbits = ImageObserver.ALLBITS;
} else {
repbits = tkimg.getImageRep().check(o);
}
return (tkimg.check(o) | repbits) & checkResolutionVariant(img, w, h, o);
}
@Override
public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
if (w == 0 || h == 0) {
return true;
}
// Must be a ToolkitImage
if (!(img instanceof ToolkitImage)) {
return true;
}
ToolkitImage tkimg = (ToolkitImage)img;
if (tkimg.hasError()) {
if (o != null) {
o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
-1, -1, -1, -1);
}
return false;
}
ImageRepresentation ir = tkimg.getImageRep();
return ir.prepare(o) & prepareResolutionVariant(img, w, h, o);
}
private int checkResolutionVariant(Image img, int w, int h, ImageObserver o) {
ToolkitImage rvImage = getResolutionVariant(img);
int rvw = getRVSize(w);
int rvh = getRVSize(h);
// Ignore the resolution variant in case of error
return (rvImage == null || rvImage.hasError()) ? 0xFFFF :
checkImage(rvImage, rvw, rvh, MultiResolutionToolkitImage.
getResolutionVariantObserver(
img, o, w, h, rvw, rvh, true));
}
private boolean prepareResolutionVariant(Image img, int w, int h,
ImageObserver o) {
ToolkitImage rvImage = getResolutionVariant(img);
int rvw = getRVSize(w);
int rvh = getRVSize(h);
// Ignore the resolution variant in case of error
return rvImage == null || rvImage.hasError() || prepareImage(
rvImage, rvw, rvh,
MultiResolutionToolkitImage.getResolutionVariantObserver(
img, o, w, h, rvw, rvh, true));
}
private static int getRVSize(int size){
return size == -1 ? -1 : 2 * size;
}
private static ToolkitImage getResolutionVariant(Image image) {
if (image instanceof MultiResolutionToolkitImage) {
Image resolutionVariant = ((MultiResolutionToolkitImage) image).
getResolutionVariant();
if (resolutionVariant instanceof ToolkitImage) {
return (ToolkitImage) resolutionVariant;
}
}
return null;
}
protected static boolean imageCached(String fileName) {
return fileImgCache.containsKey(fileName);
}
protected static boolean imageCached(URL url) {
String key = url.toString();
return urlImgCache.containsKey(key);
}
protected static boolean imageExists(String filename) {
if (filename != null) {
checkPermissions(filename);
return new File(filename).exists();
}
return false;
}
@SuppressWarnings("try")
protected static boolean imageExists(URL url) {
if (url != null) {
checkPermissions(url);
try (InputStream is = url.openStream()) {
return true;
}catch(IOException e){
return false;
}
}
return false;
}
private static void checkPermissions(String filename) {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkRead(filename);
}
}
private static void checkPermissions(URL url) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
try {
java.security.Permission perm =
URLUtil.getConnectPermission(url);
if (perm != null) {
sm.checkPermission(perm);
}
} catch (java.io.IOException ioe) {
sm.checkConnect(url.getHost(), url.getPort());
}
}
}
/**
* Scans {@code imageList} for best-looking image of specified dimensions.
* Image can be scaled and/or padded with transparency.
*/
public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
if (width == 0 || height == 0) {
return null;
}
java.util.List<Image> multiResAndnormalImages = new ArrayList<>(imageList.size());
for (Image image : imageList) {
if ((image instanceof MultiResolutionImage)) {
Image im = ((MultiResolutionImage) image).getResolutionVariant(width, height);
multiResAndnormalImages.add(im);
} else {
multiResAndnormalImages.add(image);
}
}
Image bestImage = null;
int bestWidth = 0;
int bestHeight = 0;
double bestSimilarity = 3; //Impossibly high value
double bestScaleFactor = 0;
for (Iterator<Image> i = multiResAndnormalImages.iterator();i.hasNext();) {
//Iterate imageList looking for best matching image.
//'Similarity' measure is defined as good scale factor and small insets.
//best possible similarity is 0 (no scale, no insets).
//It's found while the experiments that good-looking result is achieved
//with scale factors x1, x3/4, x2/3, xN, x1/N.
Image im = i.next();
if (im == null) {
continue;
}
if (im instanceof ToolkitImage) {
ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
ir.reconstruct(ImageObserver.ALLBITS);
}
int iw;
int ih;
try {
iw = im.getWidth(null);
ih = im.getHeight(null);
} catch (Exception e){
continue;
}
if (iw > 0 && ih > 0) {
//Calc scale factor
double scaleFactor = Math.min((double)width / (double)iw,
(double)height / (double)ih);
//Calculate scaled image dimensions
//adjusting scale factor to nearest "good" value
int adjw = 0;
int adjh = 0;
double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
if (scaleFactor >= 2) {
//Need to enlarge image more than twice
//Round down scale factor to multiply by integer value
scaleFactor = Math.floor(scaleFactor);
adjw = iw * (int)scaleFactor;
adjh = ih * (int)scaleFactor;
scaleMeasure = 1.0 - 0.5 / scaleFactor;
} else if (scaleFactor >= 1) {
//Don't scale
scaleFactor = 1.0;
adjw = iw;
adjh = ih;
scaleMeasure = 0;
} else if (scaleFactor >= 0.75) {
//Multiply by 3/4
scaleFactor = 0.75;
adjw = iw * 3 / 4;
adjh = ih * 3 / 4;
scaleMeasure = 0.3;
} else if (scaleFactor >= 0.6666) {
//Multiply by 2/3
scaleFactor = 0.6666;
adjw = iw * 2 / 3;
adjh = ih * 2 / 3;
scaleMeasure = 0.33;
} else {
//Multiply size by 1/scaleDivider
//where scaleDivider is minimum possible integer
//larger than 1/scaleFactor
double scaleDivider = Math.ceil(1.0 / scaleFactor);