gnu.java.awt.peer.qt
Class QtVolatileImage
- Transparency
QtVolatileImage - wraps a QImage
QtVolatileImage(int width, int height) - Constructs an empty QtVolatileImage.
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void | blit(QtImage i) - Blit a QImage
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void | blit(QtImage i, int x, int y, int w, int h)
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int | checkImage(ImageObserver observer) - Returns the image status, used by QtToolkit
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void | clear() - Clears the image to RGBA 0
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boolean | contentsLost() - Returns true if the contents of the image buffer have been
damaged or if the image buffer's resources have been reclaimed by
the graphics system.
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void | copyArea(int x, int y, int width, int height, int dx, int dy)
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Graphics2D | createGraphics() - Returns a Graphics2D object that can be used to draw onto this
image.
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void | dispose()
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boolean | drawImage(QtGraphics g, QMatrix matrix, ImageObserver observer) - Draws an image with eventual scaling/transforming.
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boolean | drawImage(QtGraphics g, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, Color bgcolor, ImageObserver observer) - Draws an image with eventual scaling/transforming.
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boolean | drawImage(QtGraphics g, int x, int y, int width, int height, Color bgcolor, ImageObserver observer) - Draws an image to the QtGraphics context, at (x,y) scaled to
width and height, with optional compositing with a background color.
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boolean | drawImage(QtGraphics g, int x, int y, Color bgcolor, ImageObserver observer) - Draws an image to the QtGraphics context, at (x,y) with optional
compositing with a background color.
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void | finalize()
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void | flush()
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ImageCapabilities | getCapabilities() - Returns the capabilities of this image buffer.
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Graphics | getGraphics() - Creates a Graphics context for this image.
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int | getHeight() - Returns the height of this image buffer.
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int | getHeight(ImageObserver observer)
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Object | getProperty(String name, ImageObserver observer)
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Image | getScaledInstance(int width, int height, int hints) - Returns a scaled instance of this image.
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BufferedImage | getSnapshot() - Returns an image representing the current state of the volatile
image buffer.
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ImageProducer | getSource() - Returns the source of this image.
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int | getWidth() - Returns the width of this image buffer.
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int | getWidth(ImageObserver observer)
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int | validate(GraphicsConfiguration gc) - Validates and restores this image.
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contentsLost , createGraphics , flush , getCapabilities , getGraphics , getHeight , getSnapshot , getSource , getTransparency , getWidth , validate |
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
QtVolatileImage
public QtVolatileImage(int width,
int height)
Constructs an empty QtVolatileImage.
blit
public void blit(QtImage i,
int x,
int y,
int w,
int h)
clear
public void clear()
Clears the image to RGBA 0
contentsLost
public boolean contentsLost()
Returns true if the contents of the image buffer have been
damaged or if the image buffer's resources have been reclaimed by
the graphics system. You should call this method after a series
of rendering operations to or from the image, to see if the image
buffer needs to be revalidated or the image re-rendered.
- contentsLost in interface VolatileImage
- true if the validate should be called, false otherwise
copyArea
public void copyArea(int x,
int y,
int width,
int height,
int dx,
int dy)
drawImage
public boolean drawImage(QtGraphics g,
int dx1,
int dy1,
int dx2,
int dy2,
int sx1,
int sy1,
int sx2,
int sy2,
Color bgcolor,
ImageObserver observer)
Draws an image with eventual scaling/transforming.
drawImage
public boolean drawImage(QtGraphics g,
int x,
int y,
int width,
int height,
Color bgcolor,
ImageObserver observer)
Draws an image to the QtGraphics context, at (x,y) scaled to
width and height, with optional compositing with a background color.
drawImage
public boolean drawImage(QtGraphics g,
int x,
int y,
Color bgcolor,
ImageObserver observer)
Draws an image to the QtGraphics context, at (x,y) with optional
compositing with a background color.
getSnapshot
public BufferedImage getSnapshot()
Returns an image representing the current state of the volatile
image buffer. The returned image is static meaning that it is
not updated after being created. It is a snapshot of the
volatile image buffer at the time getSnapshot is called.
This method, which reads pixels from the volatile image buffer,
may be less-performant than methods that write pixels since
VolatileImages are typically optimized for writing.
- getSnapshot in interface VolatileImage
- a BufferedImage representing this VolatileImage
validate
public int validate(GraphicsConfiguration gc)
Validates and restores this image. If the image buffer has
become unavailable for further use since the last call to
validate, validate will allocate a new image buffer. The image
is also "validated" against the GraphicsConfiguration parameter.
"Validating" the image means checking that the capabilities it
requires of the output device are indeed supported by the given
output device. If the image's characteristics, which can be
highly output device-specific, are not supported by the graphics
configuration, then IMAGE_INCOMPATIBLE will be returned. This
can happen, for example, if this image was created on one output
device, then validated against a different output device with
different capabilities. Calling validate with a NULL gc argument
causes validate to skip the validation test.
- validate in interface VolatileImage
gc
- graphics configuration against which to validate or
NULL
- a code indicating the result of validation. One of:
IMAGE_OK
if the image did not need to be
validated and didn't need to be restoredIMAGE_RESTORED
if the image may need to be
re-rendered.IMAGE_INCOMPATIBLE
if this image's
requirements are not fulfilled by the graphics configuration
parameter. This implies that you need to create a new
VolatileImage for the different GraphicsConfiguration or
Component. This return value implies nothing about whether the
image is valid or needs to be re-rendered.
QtVolatileImage.java --
Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of GNU Classpath.
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