JDK14/Java14源码在线阅读
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* published by the Free Software Foundation. Oracle designates this
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* 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).
*
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*
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package java.awt;
import java.io.IOException;
import java.awt.image.*;
import java.net.URL;
import java.net.URLConnection;
import java.io.File;
import sun.util.logging.PlatformLogger;
import sun.awt.image.SunWritableRaster;
/**
* The splash screen can be displayed at application startup, before the
* Java Virtual Machine (JVM) starts. The splash screen is displayed as an
* undecorated window containing an image. You can use GIF, JPEG, or PNG files
* for the image. Animation is supported for the GIF format, while transparency
* is supported both for GIF and PNG. The window is positioned at the center
* of the screen. The position on multi-monitor systems is not specified. It is
* platform and implementation dependent. The splash screen window is closed
* automatically as soon as the first window is displayed by Swing/AWT (may be
* also closed manually using the Java API, see below).
* <P>
* If your application is packaged in a jar file, you can use the
* "SplashScreen-Image" option in a manifest file to show a splash screen.
* Place the image in the jar archive and specify the path in the option.
* The path should not have a leading slash.
* <BR>
* For example, in the {@code manifest.mf} file:
* <PRE>
* Manifest-Version: 1.0
* Main-Class: Test
* SplashScreen-Image: filename.gif
* </PRE>
* <P>
* If the Java implementation provides the command-line interface and you run
* your application by using the command line or a shortcut, use the Java
* application launcher option to show a splash screen. The Oracle reference
* implementation allows you to specify the splash screen image location with
* the {@code -splash:} option.
* <BR>
* For example:
* <PRE>
* java -splash:filename.gif Test
* </PRE>
* HiDPI scaled image is also supported.
* Unscaled image name i.e. filename.gif should be passed in
* {@code manifest.mf}/{@code -splash:} option for all image types irrespective of
* HiDPI and Non-HiDPI.
* Following is the naming convention for scaled images.
* Screen scale 1.25: filename@125pct.gif
* Screen scale 1.50: filename@150pct.gif
* Screen scale 2: filename@200pct.gif and filename@2x.gif both are supported
* Screen scale 2.50: filename@250pct.gif
* Screen scale 3: filename@300pct.gif and filename@3x.gif both are supported
* The command line interface has higher precedence over the manifest
* setting.
* <p>
* The splash screen will be displayed as faithfully as possible to present the
* whole splash screen image given the limitations of the target platform and
* display.
* <p>
* It is implied that the specified image is presented on the screen "as is",
* i.e. preserving the exact color values as specified in the image file. Under
* certain circumstances, though, the presented image may differ, e.g. when
* applying color dithering to present a 32 bits per pixel (bpp) image on a 16
* or 8 bpp screen. The native platform display configuration may also affect
* the colors of the displayed image (e.g. color profiles, etc.)
* <p>
* The {@code SplashScreen} class provides the API for controlling the splash
* screen. This class may be used to close the splash screen, change the splash
* screen image, get the splash screen native window position/size, and paint
* in the splash screen. It cannot be used to create the splash screen. You
* should use the options provided by the Java implementation for that.
* <p>
* This class cannot be instantiated. Only a single instance of this class
* can exist, and it may be obtained by using the {@link #getSplashScreen()}
* static method. In case the splash screen has not been created at
* application startup via the command line or manifest file option,
* the {@code getSplashScreen} method returns {@code null}.
*
* @author Oleg Semenov
* @since 1.6
*/
public final class SplashScreen {
SplashScreen(long ptr) { // non-public constructor
splashPtr = ptr;
}
/**
* Returns the {@code SplashScreen} object used for
* Java startup splash screen control on systems that support display.
*
* @throws UnsupportedOperationException if the splash screen feature is not
* supported by the current toolkit
* @throws HeadlessException if {@code GraphicsEnvironment.isHeadless()}
* returns true
* @return the {@link SplashScreen} instance, or {@code null} if there is
* none or it has already been closed
*/
public static SplashScreen getSplashScreen() {
synchronized (SplashScreen.class) {
if (GraphicsEnvironment.isHeadless()) {
throw new HeadlessException();
}
// SplashScreen class is now a singleton
if (!wasClosed && theInstance == null) {
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<Void>() {
public Void run() {
System.loadLibrary("splashscreen");
return null;
}
});
long ptr = _getInstance();
if (ptr != 0 && _isVisible(ptr)) {
theInstance = new SplashScreen(ptr);
}
}
return theInstance;
}
}
/**
* Changes the splash screen image. The new image is loaded from the
* specified URL; GIF, JPEG and PNG image formats are supported.
* The method returns after the image has finished loading and the window
* has been updated.
* The splash screen window is resized according to the size of
* the image and is centered on the screen.
*
* @param imageURL the non-{@code null} URL for the new
* splash screen image
* @throws NullPointerException if {@code imageURL} is {@code null}
* @throws IOException if there was an error while loading the image
* @throws IllegalStateException if the splash screen has already been
* closed
*/
public void setImageURL(URL imageURL) throws NullPointerException, IOException, IllegalStateException {
checkVisible();
URLConnection connection = imageURL.openConnection();
connection.connect();
int length = connection.getContentLength();
java.io.InputStream stream = connection.getInputStream();
byte[] buf = new byte[length];
int off = 0;
while(true) {
// check for available data
int available = stream.available();
if (available <= 0) {
// no data available... well, let's try reading one byte
// we'll see what happens then
available = 1;
}
// check for enough room in buffer, realloc if needed
// the buffer always grows in size 2x minimum
if (off + available > length) {
length = off*2;
if (off + available > length) {
length = available+off;
}
byte[] oldBuf = buf;
buf = new byte[length];
System.arraycopy(oldBuf, 0, buf, 0, off);
}
// now read the data
int result = stream.read(buf, off, available);
if (result < 0) {
break;
}
off += result;
}
synchronized(SplashScreen.class) {
checkVisible();
if (!_setImageData(splashPtr, buf)) {
throw new IOException("Bad image format or i/o error when loading image");
}
this.imageURL = imageURL;
}
}
private void checkVisible() {
if (!isVisible()) {
throw new IllegalStateException("no splash screen available");
}
}
/**
* Returns the current splash screen image.
*
* @return URL for the current splash screen image file
* @throws IllegalStateException if the splash screen has already been closed
*/
@SuppressWarnings("deprecation")
public URL getImageURL() throws IllegalStateException {
synchronized (SplashScreen.class) {
checkVisible();
if (imageURL == null) {
try {
String fileName = _getImageFileName(splashPtr);
String jarName = _getImageJarName(splashPtr);
if (fileName != null) {
if (jarName != null) {
imageURL = new URL("jar:"+(new File(jarName).toURL().toString())+"!/"+fileName);
} else {
imageURL = new File(fileName).toURL();
}
}
}
catch(java.net.MalformedURLException e) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("MalformedURLException caught in the getImageURL() method", e);
}
}
}
return imageURL;
}
}
/**
* Returns the bounds of the splash screen window as a {@link Rectangle}.
* This may be useful if, for example, you want to replace the splash
* screen with your window at the same location.
* <p>
* You cannot control the size or position of the splash screen.
* The splash screen size is adjusted automatically when the image changes.
* <p>
* The image may contain transparent areas, and thus the reported bounds may
* be larger than the visible splash screen image on the screen.
*
* @return a {@code Rectangle} containing the splash screen bounds
* @throws IllegalStateException if the splash screen has already been closed
*/
public Rectangle getBounds() throws IllegalStateException {
synchronized (SplashScreen.class) {
checkVisible();
float scale = _getScaleFactor(splashPtr);
Rectangle bounds = _getBounds(splashPtr);
assert scale > 0;
if (scale > 0 && scale != 1) {
bounds.setSize((int) (bounds.getWidth() / scale),
(int) (bounds.getHeight() / scale));
}
return bounds;
}
}
/**
* Returns the size of the splash screen window as a {@link Dimension}.
* This may be useful if, for example,
* you want to draw on the splash screen overlay surface.
* <p>
* You cannot control the size or position of the splash screen.
* The splash screen size is adjusted automatically when the image changes.
* <p>
* The image may contain transparent areas, and thus the reported size may
* be larger than the visible splash screen image on the screen.
*
* @return a {@link Dimension} object indicating the splash screen size
* @throws IllegalStateException if the splash screen has already been closed
*/
public Dimension getSize() throws IllegalStateException {
return getBounds().getSize();
}
/**
* Creates a graphics context (as a {@link Graphics2D} object) for the splash
* screen overlay image, which allows you to draw over the splash screen.
* Note that you do not draw on the main image but on the image that is
* displayed over the main image using alpha blending. Also note that drawing
* on the overlay image does not necessarily update the contents of splash
* screen window. You should call {@code update()} on the
* {@code SplashScreen} when you want the splash screen to be
* updated immediately.
* <p>
* The pixel (0, 0) in the coordinate space of the graphics context
* corresponds to the origin of the splash screen native window bounds (see
* {@link #getBounds()}).
*
* @return graphics context for the splash screen overlay surface
* @throws IllegalStateException if the splash screen has already been closed
*/
public Graphics2D createGraphics() throws IllegalStateException {
synchronized (SplashScreen.class) {
checkVisible();
if (image==null) {
// get unscaled splash image size
Dimension dim = _getBounds(splashPtr).getSize();
image = new BufferedImage(dim.width, dim.height,
BufferedImage.TYPE_INT_ARGB);
}
float scale = _getScaleFactor(splashPtr);
Graphics2D g = image.createGraphics();
assert (scale > 0);
if (scale <= 0) {
scale = 1;
}
g.scale(scale, scale);
return g;
}
}
/**
* Updates the splash window with current contents of the overlay image.
*
* @throws IllegalStateException if the overlay image does not exist;
* for example, if {@code createGraphics} has never been called,
* or if the splash screen has already been closed
*/
public void update() throws IllegalStateException {
BufferedImage image;
synchronized (SplashScreen.class) {
checkVisible();
image = this.image;
}
if (image == null) {
throw new IllegalStateException("no overlay image available");
}
DataBuffer buf = image.getRaster().getDataBuffer();
if (!(buf instanceof DataBufferInt)) {
throw new AssertionError("Overlay image DataBuffer is of invalid type == "+buf.getClass().getName());
}
int numBanks = buf.getNumBanks();
if (numBanks!=1) {
throw new AssertionError("Invalid number of banks =="+numBanks+" in overlay image DataBuffer");
}
if (!(image.getSampleModel() instanceof SinglePixelPackedSampleModel)) {
throw new AssertionError("Overlay image has invalid sample model == "+image.getSampleModel().getClass().getName());
}
SinglePixelPackedSampleModel sm = (SinglePixelPackedSampleModel)image.getSampleModel();
int scanlineStride = sm.getScanlineStride();
Rectangle rect = image.getRaster().getBounds();
// Note that we steal the data array here, but just for reading
// so we do not need to mark the DataBuffer dirty...
int[] data = SunWritableRaster.stealData((DataBufferInt)buf, 0);
synchronized(SplashScreen.class) {
checkVisible();
_update(splashPtr, data, rect.x, rect.y, rect.width, rect.height, scanlineStride);
}
}
/**
* Hides the splash screen, closes the window, and releases all associated
* resources.
*
* @throws IllegalStateException if the splash screen has already been closed
*/
public void close() throws IllegalStateException {
synchronized (SplashScreen.class) {
checkVisible();
_close(splashPtr);
image = null;
SplashScreen.markClosed();
}
}
static void markClosed() {
synchronized (SplashScreen.class) {
wasClosed = true;
theInstance = null;
}
}
/**
* Determines whether the splash screen is visible. The splash screen may
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