oracle.cabo.image.painter
Class OffscreenWrappingPainter

java.lang.Object
  |
  +--oracle.cabo.image.painter.AbstractPainter
        |
        +--oracle.cabo.image.painter.AbstractWrappingPainter
              |
              +--oracle.cabo.image.painter.OffscreenWrappingPainter

All Implemented Interfaces:

java.awt.image.ImageObserver, Painter

public class OffscreenWrappingPainter

extends AbstractWrappingPainter

implements java.awt.image.ImageObserver

This is used to render the contents of another painter (the wrapped painter) into an offscreen buffer before rendering to the paint Graphics object. This is an unusual thing to do, but seems to be the only way to workaround the funky Java2D/BufferedImage text rendering problems. (See bug 1288470).

Java2D mucks up non-antialiased text drawn into BufferedImages. So, when drawing non-antialiased text, we first draw it into an offscreen buffer and then into the BufferedImage. This class will certainly go away once the underlying Java2D bug is fixed.

Think twice about using this class - it adds overhead to the render since any wrapped rendering is double buffered.

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Fields inherited from interface oracle.cabo.image.painter.Painter

STATE_ACTIVE_CHANGED, STATE_ARMED_CHANGED, STATE_BACKGROUND_CHANGED, STATE_ENABLED_CHANGED, STATE_FOCUSED_CHANGED, STATE_FONT_CHANGED, STATE_FOREGROUND_CHANGED, STATE_ISDEFAULT_CHANGED, STATE_MOUSE_OVER_CHANGED, STATE_READING_DIRECTION_CHANGED, STATE_SELECTED_CHANGED, STATE_SET_CHANGED, STATE_SIZE_CHANGED, STATE_XALIGNMENT_CHANGED, STATE_YALIGNMENT_CHANGED

Constructor Summary

OffscreenWrappingPainter(Painter wrappedPainter)

Method Summary

java.awt.Dimension	getPreferredSize(PaintContext context) Returns the preferred size of the wrapped painter.
boolean	imageUpdate(java.awt.Image img, int infoflags, int x, int y, int width, int height) ImageObserver implementation
void	paint(PaintContext context, java.awt.Graphics g, int x, int y, int width, int height) Paints the wrapped Painter.

Methods inherited from class oracle.cabo.image.painter.AbstractWrappingPainter

getInvalidateFlags, getMaximumSize, getMinimumSize, getPainterAt, getRepaintFlags, getSize, getWrappedPainter, isTransparent

Methods inherited from class oracle.cabo.image.painter.AbstractPainter

contains, getData, getDataKey

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OffscreenWrappingPainter

public OffscreenWrappingPainter(Painter wrappedPainter)

Method Detail

paint

public void paint(PaintContext context,
                  java.awt.Graphics g,
                  int x,
                  int y,
                  int width,
                  int height)

Description copied from class: AbstractWrappingPainter

Paints the wrapped Painter.

Overrides:

paint in class AbstractWrappingPainter

Following copied from class: oracle.cabo.image.painter.AbstractWrappingPainter

Parameters:

context - Context for painting.

g - Graphics object to draw into.

x - X position to draw at.

y - Y position to draw at.

width - Width to draw into.

height - Height to draw into.

getPreferredSize

public java.awt.Dimension getPreferredSize(PaintContext context)

Description copied from class: AbstractWrappingPainter

Returns the preferred size of the wrapped painter.

Overrides:

getPreferredSize in class AbstractWrappingPainter

Following copied from class: oracle.cabo.image.painter.AbstractWrappingPainter

Parameters:

context - Context for determining the preferred size.

Returns:

The preferred size of the Painter.

imageUpdate

public boolean imageUpdate(java.awt.Image img,
                           int infoflags,
                           int x,
                           int y,
                           int width,
                           int height)

ImageObserver implementation

Specified by:

imageUpdate in interface java.awt.image.ImageObserver