public BufferedImage buildBufferFor(Panel panel) {
Dimension dimension = new Dimension(panel.getWidth(), panel.getHeight());
BufferedImage buffer = bufferedImagePool.acquire(dimension);
Graphics2D graphics = buffer.createGraphics();
graphics.setBackground(Colors.TRANSPARENT);
graphics.clearRect(0, 0, panel.getWidth(), panel.getHeight());
panel.paintOn(graphics);
graphics.dispose();
bufferCache.cache(panel, buffer);
return buffer;
}
private void paintChild(Graphics2D graphics, Panel child) {
if (panelIsInClip(child)) {
Graphics2D childGraphics =
(Graphics2D)
graphics.create(child.getX(), child.getY(), child.getWidth(), child.getHeight());
paint(child, childGraphics);
childGraphics.dispose();
}
}
public void paint(Panel panel) {
Box panelBounds = panel.getAbsoluteBounds();
int x = panelBounds.x - clip.x;
int y = panelBounds.y - clip.y;
Graphics2D graphics =
(Graphics2D) rootGraphics.create(x, y, panel.getWidth(), panel.getHeight());
paint(panel, graphics);
graphics.dispose();
rootGraphics.dispose();
}
public boolean shouldBuildBufferFor(Panel panel, BufferedImage buffer) {
return buffer == null
|| panel.getWidth() != buffer.getWidth()
|| panel.getHeight() != buffer.getHeight();
}