Java example source code file (GraphicsDevice.java)
The GraphicsDevice.java Java example source code/*
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package java.awt;
import java.awt.image.ColorModel;
import sun.awt.AWTAccessor;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
/**
* The <code>GraphicsDevice class describes the graphics devices
* that might be available in a particular graphics environment. These
* include screen and printer devices. Note that there can be many screens
* and many printers in an instance of {@link GraphicsEnvironment}. Each
* graphics device has one or more {@link GraphicsConfiguration} objects
* associated with it. These objects specify the different configurations
* in which the <code>GraphicsDevice can be used.
* <p>
* In a multi-screen environment, the <code>GraphicsConfiguration
* objects can be used to render components on multiple screens. The
* following code sample demonstrates how to create a <code>JFrame
* object for each <code>GraphicsConfiguration on each screen
* device in the <code>GraphicsEnvironment:
* <pre>{@code
* GraphicsEnvironment ge = GraphicsEnvironment.
* getLocalGraphicsEnvironment();
* GraphicsDevice[] gs = ge.getScreenDevices();
* for (int j = 0; j < gs.length; j++) {
* GraphicsDevice gd = gs[j];
* GraphicsConfiguration[] gc =
* gd.getConfigurations();
* for (int i=0; i < gc.length; i++) {
* JFrame f = new
* JFrame(gs[j].getDefaultConfiguration());
* Canvas c = new Canvas(gc[i]);
* Rectangle gcBounds = gc[i].getBounds();
* int xoffs = gcBounds.x;
* int yoffs = gcBounds.y;
* f.getContentPane().add(c);
* f.setLocation((i*50)+xoffs, (i*60)+yoffs);
* f.show();
* }
* }
* }</pre>
* <p>
* For more information on full-screen exclusive mode API, see the
* <a href="http://docs.oracle.com/javase/tutorial/extra/fullscreen/index.html">
* Full-Screen Exclusive Mode API Tutorial</a>.
*
* @see GraphicsEnvironment
* @see GraphicsConfiguration
*/
public abstract class GraphicsDevice {
private Window fullScreenWindow;
private AppContext fullScreenAppContext; // tracks which AppContext
// created the FS window
// this lock is used for making synchronous changes to the AppContext's
// current full screen window
private final Object fsAppContextLock = new Object();
private Rectangle windowedModeBounds;
/**
* This is an abstract class that cannot be instantiated directly.
* Instances must be obtained from a suitable factory or query method.
* @see GraphicsEnvironment#getScreenDevices
* @see GraphicsEnvironment#getDefaultScreenDevice
* @see GraphicsConfiguration#getDevice
*/
protected GraphicsDevice() {
}
/**
* Device is a raster screen.
*/
public final static int TYPE_RASTER_SCREEN = 0;
/**
* Device is a printer.
*/
public final static int TYPE_PRINTER = 1;
/**
* Device is an image buffer. This buffer can reside in device
* or system memory but it is not physically viewable by the user.
*/
public final static int TYPE_IMAGE_BUFFER = 2;
/**
* Kinds of translucency supported by the underlying system.
*
* @see #isWindowTranslucencySupported
*
* @since 1.7
*/
public static enum WindowTranslucency {
/**
* Represents support in the underlying system for windows each pixel
* of which is guaranteed to be either completely opaque, with
* an alpha value of 1.0, or completely transparent, with an alpha
* value of 0.0.
*/
PERPIXEL_TRANSPARENT,
/**
* Represents support in the underlying system for windows all of
* the pixels of which have the same alpha value between or including
* 0.0 and 1.0.
*/
TRANSLUCENT,
/**
* Represents support in the underlying system for windows that
* contain or might contain pixels with arbitrary alpha values
* between and including 0.0 and 1.0.
*/
PERPIXEL_TRANSLUCENT;
}
/**
* Returns the type of this <code>GraphicsDevice.
* @return the type of this <code>GraphicsDevice, which can
* either be TYPE_RASTER_SCREEN, TYPE_PRINTER or TYPE_IMAGE_BUFFER.
* @see #TYPE_RASTER_SCREEN
* @see #TYPE_PRINTER
* @see #TYPE_IMAGE_BUFFER
*/
public abstract int getType();
/**
* Returns the identification string associated with this
* <code>GraphicsDevice.
* <p>
* A particular program might use more than one
* <code>GraphicsDevice in a
*
* @param dm The new display mode of this graphics device.
* @exception IllegalArgumentException if the <code>DisplayMode
* supplied is <code>null, or is not available in the array returned
* by <code>getDisplayModes
* @exception UnsupportedOperationException if
* <code>isDisplayChangeSupported returns false
* @see #getDisplayMode
* @see #getDisplayModes
* @see #isDisplayChangeSupported
* @since 1.4
*/
public void setDisplayMode(DisplayMode dm) {
throw new UnsupportedOperationException("Cannot change display mode");
}
/**
* Returns the current display mode of this
* <code>GraphicsDevice.
* The returned display mode is allowed to have a refresh rate
* {@link DisplayMode#REFRESH_RATE_UNKNOWN} if it is indeterminate.
* Likewise, the returned display mode is allowed to have a bit depth
* {@link DisplayMode#BIT_DEPTH_MULTI} if it is indeterminate or if multiple
* bit depths are supported.
* @return the current display mode of this graphics device.
* @see #setDisplayMode(DisplayMode)
* @since 1.4
*/
public DisplayMode getDisplayMode() {
GraphicsConfiguration gc = getDefaultConfiguration();
Rectangle r = gc.getBounds();
ColorModel cm = gc.getColorModel();
return new DisplayMode(r.width, r.height, cm.getPixelSize(), 0);
}
/**
* Returns all display modes available for this
* <code>GraphicsDevice.
* The returned display modes are allowed to have a refresh rate
* {@link DisplayMode#REFRESH_RATE_UNKNOWN} if it is indeterminate.
* Likewise, the returned display modes are allowed to have a bit depth
* {@link DisplayMode#BIT_DEPTH_MULTI} if it is indeterminate or if multiple
* bit depths are supported.
* @return all of the display modes available for this graphics device.
* @since 1.4
*/
public DisplayMode[] getDisplayModes() {
return new DisplayMode[] { getDisplayMode() };
}
/**
* This method returns the number of bytes available in
* accelerated memory on this device.
* Some images are created or cached
* in accelerated memory on a first-come,
* first-served basis. On some operating systems,
* this memory is a finite resource. Calling this method
* and scheduling the creation and flushing of images carefully may
* enable applications to make the most efficient use of
* that finite resource.
* <br>
* Note that the number returned is a snapshot of how much
* memory is available; some images may still have problems
* being allocated into that memory. For example, depending
* on operating system, driver, memory configuration, and
* thread situations, the full extent of the size reported
* may not be available for a given image. There are further
* inquiry methods on the {@link ImageCapabilities} object
* associated with a VolatileImage that can be used to determine
* whether a particular VolatileImage has been created in accelerated
* memory.
* @return number of bytes available in accelerated memory.
* A negative return value indicates that the amount of accelerated memory
* on this GraphicsDevice is indeterminate.
* @see java.awt.image.VolatileImage#flush
* @see ImageCapabilities#isAccelerated
* @since 1.4
*/
public int getAvailableAcceleratedMemory() {
return -1;
}
/**
* Returns whether the given level of translucency is supported by
* this graphics device.
*
* @param translucencyKind a kind of translucency support
* @return whether the given translucency kind is supported
*
* @since 1.7
*/
public boolean isWindowTranslucencySupported(WindowTranslucency translucencyKind) {
switch (translucencyKind) {
case PERPIXEL_TRANSPARENT:
return isWindowShapingSupported();
case TRANSLUCENT:
return isWindowOpacitySupported();
case PERPIXEL_TRANSLUCENT:
return isWindowPerpixelTranslucencySupported();
}
return false;
}
/**
* Returns whether the windowing system supports changing the shape
* of top-level windows.
* Note that this method may sometimes return true, but the native
* windowing system may still not support the concept of
* shaping (due to the bugs in the windowing system).
*/
static boolean isWindowShapingSupported() {
Toolkit curToolkit = Toolkit.getDefaultToolkit();
if (!(curToolkit instanceof SunToolkit)) {
return false;
}
return ((SunToolkit)curToolkit).isWindowShapingSupported();
}
/**
* Returns whether the windowing system supports changing the opacity
* value of top-level windows.
* Note that this method may sometimes return true, but the native
* windowing system may still not support the concept of
* translucency (due to the bugs in the windowing system).
*/
static boolean isWindowOpacitySupported() {
Toolkit curToolkit = Toolkit.getDefaultToolkit();
if (!(curToolkit instanceof SunToolkit)) {
return false;
}
return ((SunToolkit)curToolkit).isWindowOpacitySupported();
}
boolean isWindowPerpixelTranslucencySupported() {
/*
* Per-pixel alpha is supported if all the conditions are TRUE:
* 1. The toolkit is a sort of SunToolkit
* 2. The toolkit supports translucency in general
* (isWindowTranslucencySupported())
* 3. There's at least one translucency-capable
* GraphicsConfiguration
*/
Toolkit curToolkit = Toolkit.getDefaultToolkit();
if (!(curToolkit instanceof SunToolkit)) {
return false;
}
if (!((SunToolkit)curToolkit).isWindowTranslucencySupported()) {
return false;
}
// TODO: cache translucency capable GC
return getTranslucencyCapableGC() != null;
}
GraphicsConfiguration getTranslucencyCapableGC() {
// If the default GC supports translucency return true.
// It is important to optimize the verification this way,
// see CR 6661196 for more details.
GraphicsConfiguration defaultGC = getDefaultConfiguration();
if (defaultGC.isTranslucencyCapable()) {
return defaultGC;
}
// ... otherwise iterate through all the GCs.
GraphicsConfiguration[] configs = getConfigurations();
for (int j = 0; j < configs.length; j++) {
if (configs[j].isTranslucencyCapable()) {
return configs[j];
}
}
return null;
}
}
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