GraphicsConfiguration class describes the
* characteristics of a graphics destination such as a printer or monitor.
* There can be many GraphicsConfiguration objects associated
* with a single graphics device, representing different drawing modes or
* capabilities. The corresponding native structure will vary from platform
* to platform. For example, on X11 windowing systems,
* each visual is a different GraphicsConfiguration.
* On Microsoft Windows, GraphicsConfigurations represent
* PixelFormats available in the current resolution and color depth.
*
* In a virtual device multi-screen environment in which the desktop
* area could span multiple physical screen devices, the bounds of the
* GraphicsConfiguration objects are relative to the
* virtual coordinate system. When setting the location of a
* component, use {@link #getBounds() getBounds} to get the bounds of
* the desired GraphicsConfiguration and offset the location
* with the coordinates of the GraphicsConfiguration,
* as the following code sample illustrates:
*
* Frame f = new Frame(gc); // where gc is a GraphicsConfiguration * Rectangle bounds = gc.getBounds(); * f.setLocation(10 + bounds.x, 10 + bounds.y);* *
* To determine if your environment is a virtual device
* environment, call getBounds on all of the
* GraphicsConfiguration objects in your system. If
* any of the origins of the returned bounds is not (0, 0),
* your environment is a virtual device environment.
*
*
* You can also use getBounds to determine the bounds
* of the virtual device. To do this, first call getBounds on all
* of the GraphicsConfiguration objects in your
* system. Then calculate the union of all of the bounds returned
* from the calls to getBounds. The union is the
* bounds of the virtual device. The following code sample
* calculates the bounds of the virtual device.
*
*
* Rectangle virtualBounds = new Rectangle();
* 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++) {
* virtualBounds =
* virtualBounds.union(gc[i].getBounds());
* }
* }
*
* @see Window
* @see Frame
* @see GraphicsEnvironment
* @see GraphicsDevice
*/
/*
* REMIND: What to do about capabilities?
* The
* capabilities of the device can be determined by enumerating the possible
* capabilities and checking if the GraphicsConfiguration
* implements the interface for that capability.
*
*/
public abstract class GraphicsConfiguration {
private static BufferCapabilities defaultBufferCaps;
private static ImageCapabilities defaultImageCaps;
/**
* This is an abstract class that cannot be instantiated directly.
* Instances must be obtained from a suitable factory or query method.
*
* @see GraphicsDevice#getConfigurations
* @see GraphicsDevice#getDefaultConfiguration
* @see GraphicsDevice#getBestConfiguration
* @see Graphics2D#getDeviceConfiguration
*/
protected GraphicsConfiguration() {
}
/**
* Returns the {@link GraphicsDevice} associated with this
* GraphicsConfiguration.
* @return a GraphicsDevice object that is
* associated with this GraphicsConfiguration.
*/
public abstract GraphicsDevice getDevice();
/**
* Returns a {@link BufferedImage} with a data layout and color model
* compatible with this GraphicsConfiguration. This
* method has nothing to do with memory-mapping
* a device. The returned BufferedImage has
* a layout and color model that is closest to this native device
* configuration and can therefore be optimally blitted to this
* device.
* @param width the width of the returned BufferedImage
* @param height the height of the returned BufferedImage
* @return a BufferedImage whose data layout and color
* model is compatible with this GraphicsConfiguration.
*/
public BufferedImage createCompatibleImage(int width, int height) {
ColorModel model = getColorModel();
WritableRaster raster =
model.createCompatibleWritableRaster(width, height);
return new BufferedImage(model, raster,
model.isAlphaPremultiplied(), null);
}
/**
* Returns a BufferedImage that supports the specified
* transparency and has a data layout and color model
* compatible with this GraphicsConfiguration. This
* method has nothing to do with memory-mapping
* a device. The returned BufferedImage has a layout and
* color model that can be optimally blitted to a device
* with this GraphicsConfiguration.
* @param width the width of the returned BufferedImage
* @param height the height of the returned BufferedImage
* @param transparency the specified transparency mode
* @return a BufferedImage whose data layout and color
* model is compatible with this GraphicsConfiguration
* and also supports the specified transparency.
* @throws IllegalArgumentException if the transparency is not a valid value
* @see Transparency#OPAQUE
* @see Transparency#BITMASK
* @see Transparency#TRANSLUCENT
*/
public BufferedImage createCompatibleImage(int width, int height,
int transparency)
{
if (getColorModel().getTransparency() == transparency) {
return createCompatibleImage(width, height);
}
ColorModel cm = getColorModel(transparency);
if (cm == null) {
throw new IllegalArgumentException("Unknown transparency: " +
transparency);
}
WritableRaster wr = cm.createCompatibleWritableRaster(width, height);
return new BufferedImage(cm, wr, cm.isAlphaPremultiplied(), null);
}
/**
* Returns a {@link VolatileImage} with a data layout and color model
* compatible with this GraphicsConfiguration.
* The returned VolatileImage
* may have data that is stored optimally for the underlying graphics
* device and may therefore benefit from platform-specific rendering
* acceleration.
* @param width the width of the returned VolatileImage
* @param height the height of the returned VolatileImage
* @return a VolatileImage whose data layout and color
* model is compatible with this GraphicsConfiguration.
* @see Component#createVolatileImage(int, int)
* @since 1.4
*/
public VolatileImage createCompatibleVolatileImage(int width, int height) {
VolatileImage vi = null;
try {
vi = createCompatibleVolatileImage(width, height,
null, Transparency.OPAQUE);
} catch (AWTException e) {
// shouldn't happen: we're passing in null caps
assert false;
}
return vi;
}
/**
* Returns a {@link VolatileImage} with a data layout and color model
* compatible with this GraphicsConfiguration.
* The returned VolatileImage
* may have data that is stored optimally for the underlying graphics
* device and may therefore benefit from platform-specific rendering
* acceleration.
* @param width the width of the returned VolatileImage
* @param height the height of the returned VolatileImage
* @param transparency the specified transparency mode
* @return a VolatileImage whose data layout and color
* model is compatible with this GraphicsConfiguration.
* @throws IllegalArgumentException if the transparency is not a valid value
* @see Transparency#OPAQUE
* @see Transparency#BITMASK
* @see Transparency#TRANSLUCENT
* @see Component#createVolatileImage(int, int)
* @since 1.5
*/
public VolatileImage createCompatibleVolatileImage(int width, int height,
int transparency)
{
VolatileImage vi = null;
try {
vi = createCompatibleVolatileImage(width, height, null, transparency);
} catch (AWTException e) {
// shouldn't happen: we're passing in null caps
assert false;
}
return vi;
}
/**
* Returns a {@link VolatileImage} with a data layout and color model
* compatible with this GraphicsConfiguration, using
* the specified image capabilities.
* If the caps parameter is null, it is effectively ignored
* and this method will create a VolatileImage without regard to
* ImageCapabilities constraints.
*
* The returned VolatileImage has
* a layout and color model that is closest to this native device
* configuration and can therefore be optimally blitted to this
* device.
* @return a VolatileImage whose data layout and color
* model is compatible with this GraphicsConfiguration.
* @param width the width of the returned VolatileImage
* @param height the height of the returned VolatileImage
* @param caps the image capabilities
* @exception AWTException if the supplied image capabilities could not
* be met by this graphics configuration
* @since 1.4
*/
public VolatileImage createCompatibleVolatileImage(int width, int height,
ImageCapabilities caps) throws AWTException
{
return createCompatibleVolatileImage(width, height, caps,
Transparency.OPAQUE);
}
/**
* Returns a {@link VolatileImage} with a data layout and color model
* compatible with this GraphicsConfiguration, using
* the specified image capabilities and transparency value.
* If the caps parameter is null, it is effectively ignored
* and this method will create a VolatileImage without regard to
* ImageCapabilities constraints.
*
* The returned VolatileImage has
* a layout and color model that is closest to this native device
* configuration and can therefore be optimally blitted to this
* device.
* @param width the width of the returned VolatileImage
* @param height the height of the returned VolatileImage
* @param caps the image capabilities
* @param transparency the specified transparency mode
* @return a VolatileImage whose data layout and color
* model is compatible with this GraphicsConfiguration.
* @see Transparency#OPAQUE
* @see Transparency#BITMASK
* @see Transparency#TRANSLUCENT
* @throws IllegalArgumentException if the transparency is not a valid value
* @exception AWTException if the supplied image capabilities could not
* be met by this graphics configuration
* @see Component#createVolatileImage(int, int)
* @since 1.5
*/
public VolatileImage createCompatibleVolatileImage(int width, int height,
ImageCapabilities caps, int transparency) throws AWTException
{
VolatileImage vi =
new Container().createVolatileImage(width, height, caps);
if (caps != null && caps.isAccelerated() &&
!vi.getCapabilities().isAccelerated())
{
throw new AWTException("Supplied image capabilities could not " +
"be met by this graphics configuration.");
}
return vi;
}
/**
* Returns the {@link ColorModel} associated with this
* GraphicsConfiguration.
* @return a ColorModel object that is associated with
* this GraphicsConfiguration.
*/
public abstract ColorModel getColorModel();
/**
* Returns the ColorModel associated with this
* GraphicsConfiguration that supports the specified
* transparency.
* @param transparency the specified transparency mode
* @return a ColorModel object that is associated with
* this GraphicsConfiguration and supports the
* specified transparency or null if the transparency is not a valid
* value.
* @see Transparency#OPAQUE
* @see Transparency#BITMASK
* @see Transparency#TRANSLUCENT
*/
public abstract ColorModel getColorModel(int transparency);
/**
* Returns the default {@link AffineTransform} for this
* GraphicsConfiguration. This
* AffineTransform is typically the Identity transform
* for most normal screens. The default AffineTransform
* maps coordinates onto the device such that 72 user space
* coordinate units measure approximately 1 inch in device
* space. The normalizing transform can be used to make
* this mapping more exact. Coordinates in the coordinate space
* defined by the default AffineTransform for screen and
* printer devices have the origin in the upper left-hand corner of
* the target region of the device, with X coordinates
* increasing to the right and Y coordinates increasing downwards.
* For image buffers not associated with a device, such as those not
* created by createCompatibleImage,
* this AffineTransform is the Identity transform.
* @return the default AffineTransform for this
* GraphicsConfiguration.
*/
public abstract AffineTransform getDefaultTransform();
/**
*
* Returns a AffineTransform that can be concatenated
* with the default AffineTransform
* of a GraphicsConfiguration so that 72 units in user
* space equals 1 inch in device space.
* * For a particular {@link Graphics2D}, g, one * can reset the transformation to create * such a mapping by using the following pseudocode: *
* GraphicsConfiguration gc = g.getDeviceConfiguration();
*
* g.setTransform(gc.getDefaultTransform());
* g.transform(gc.getNormalizingTransform());
*
* Note that sometimes this AffineTransform is identity,
* such as for printers or metafile output, and that this
* AffineTransform is only as accurate as the information
* supplied by the underlying system. For image buffers not
* associated with a device, such as those not created by
* createCompatibleImage, this
* AffineTransform is the Identity transform
* since there is no valid distance measurement.
* @return an AffineTransform to concatenate to the
* default AffineTransform so that 72 units in user
* space is mapped to 1 inch in device space.
*/
public abstract AffineTransform getNormalizingTransform();
/**
* Returns the bounds of the GraphicsConfiguration
* in the device coordinates. In a multi-screen environment
* with a virtual device, the bounds can have negative X
* or Y origins.
* @return the bounds of the area covered by this
* GraphicsConfiguration.
* @since 1.3
*/
public abstract Rectangle getBounds();
private static class DefaultBufferCapabilities extends BufferCapabilities {
public DefaultBufferCapabilities(ImageCapabilities imageCaps) {
super(imageCaps, imageCaps, null);
}
}
/**
* Returns the buffering capabilities of this
* GraphicsConfiguration.
* @return the buffering capabilities of this graphics
* configuration object
* @since 1.4
*/
public BufferCapabilities getBufferCapabilities() {
if (defaultBufferCaps == null) {
defaultBufferCaps = new DefaultBufferCapabilities(
getImageCapabilities());
}
return defaultBufferCaps;
}
/**
* Returns the image capabilities of this
* GraphicsConfiguration.
* @return the image capabilities of this graphics
* configuration object
* @since 1.4
*/
public ImageCapabilities getImageCapabilities() {
if (defaultImageCaps == null) {
defaultImageCaps = new ImageCapabilities(false);
}
return defaultImageCaps;
}
/**
* Returns whether this {@code GraphicsConfiguration} supports
* the {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
* PERPIXEL_TRANSLUCENT} kind of translucency.
*
* @return whether the given GraphicsConfiguration supports
* the translucency effects.
*
* @see Window#setBackground(Color)
*
* @since 1.7
*/
public boolean isTranslucencyCapable() {
// Overridden in subclasses
return false;
}
}