972 return null;
973 }
974 }
975
976 GraphicsConfiguration config = c.getGraphicsConfiguration();
977 if (config == null) {
978 config = GraphicsEnvironment.getLocalGraphicsEnvironment().
979 getDefaultScreenDevice().getDefaultConfiguration();
980 }
981 Dimension maxSize = getDoubleBufferMaximumSize();
982 int width = proposedWidth < 1 ? 1 :
983 (proposedWidth > maxSize.width? maxSize.width : proposedWidth);
984 int height = proposedHeight < 1 ? 1 :
985 (proposedHeight > maxSize.height? maxSize.height : proposedHeight);
986 VolatileImage image = volatileMap.get(config);
987 if (image == null || image.getWidth() < width ||
988 image.getHeight() < height) {
989 if (image != null) {
990 image.flush();
991 }
992 image = config.createCompatibleVolatileImage(width, height);
993 volatileMap.put(config, image);
994 }
995 return image;
996 }
997
998 private Image _getOffscreenBuffer(Component c, int proposedWidth, int proposedHeight) {
999 Dimension maxSize = getDoubleBufferMaximumSize();
1000 DoubleBufferInfo doubleBuffer;
1001 int width, height;
1002
1003 // If the window is non-opaque, it's double-buffered at peer's level
1004 Window w = (c instanceof Window) ? (Window)c : SwingUtilities.getWindowAncestor(c);
1005 if (!w.isOpaque()) {
1006 Toolkit tk = Toolkit.getDefaultToolkit();
1007 if ((tk instanceof SunToolkit) && (((SunToolkit)tk).needUpdateWindow())) {
1008 return null;
1009 }
1010 }
1011
1012 if (standardDoubleBuffer == null) {
1460 return false;
1461 }
1462
1463 /**
1464 * Invoked when the doubleBuffered or useTrueDoubleBuffering
1465 * properties of a JRootPane change. This may come in on any thread.
1466 */
1467 public void doubleBufferingChanged(JRootPane rootPane) {
1468 }
1469
1470 /**
1471 * Paints a portion of a component to an offscreen buffer.
1472 */
1473 protected void paintDoubleBuffered(JComponent c, Image image,
1474 Graphics g, int clipX, int clipY,
1475 int clipW, int clipH) {
1476 Graphics osg = image.getGraphics();
1477 int bw = Math.min(clipW, image.getWidth(null));
1478 int bh = Math.min(clipH, image.getHeight(null));
1479 int x,y,maxx,maxy;
1480
1481 try {
1482 for(x = clipX, maxx = clipX+clipW; x < maxx ; x += bw ) {
1483 for(y=clipY, maxy = clipY + clipH; y < maxy ; y += bh) {
1484 osg.translate(-x, -y);
1485 osg.setClip(x,y,bw,bh);
1486 c.paintToOffscreen(osg, x, y, bw, bh, maxx, maxy);
1487 g.setClip(x, y, bw, bh);
1488 g.drawImage(image, x, y, c);
1489 osg.translate(x, y);
1490 }
1491 }
1492 } finally {
1493 osg.dispose();
1494 }
1495 }
1496
1497 /**
1498 * If <code>image</code> is non-null with a positive size it
1499 * is returned, otherwise null is returned.
1500 */
1501 private Image getValidImage(Image image) {
1502 if (image != null && image.getWidth(null) > 0 &&
1503 image.getHeight(null) > 0) {
1504 return image;
1505 }
1506 return null;
1507 }
1508
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972 return null;
973 }
974 }
975
976 GraphicsConfiguration config = c.getGraphicsConfiguration();
977 if (config == null) {
978 config = GraphicsEnvironment.getLocalGraphicsEnvironment().
979 getDefaultScreenDevice().getDefaultConfiguration();
980 }
981 Dimension maxSize = getDoubleBufferMaximumSize();
982 int width = proposedWidth < 1 ? 1 :
983 (proposedWidth > maxSize.width? maxSize.width : proposedWidth);
984 int height = proposedHeight < 1 ? 1 :
985 (proposedHeight > maxSize.height? maxSize.height : proposedHeight);
986 VolatileImage image = volatileMap.get(config);
987 if (image == null || image.getWidth() < width ||
988 image.getHeight() < height) {
989 if (image != null) {
990 image.flush();
991 }
992 final Toolkit tk = Toolkit.getDefaultToolkit();
993 if ((tk instanceof SunToolkit) && ((SunToolkit)tk).isSwingBackbufferTranslucencySupported()) {
994 image = config.createCompatibleVolatileImage(width, height, Transparency.TRANSLUCENT);
995 }else {
996 image = config.createCompatibleVolatileImage(width, height);
997 }
998 volatileMap.put(config, image);
999 }
1000 return image;
1001 }
1002
1003 private Image _getOffscreenBuffer(Component c, int proposedWidth, int proposedHeight) {
1004 Dimension maxSize = getDoubleBufferMaximumSize();
1005 DoubleBufferInfo doubleBuffer;
1006 int width, height;
1007
1008 // If the window is non-opaque, it's double-buffered at peer's level
1009 Window w = (c instanceof Window) ? (Window)c : SwingUtilities.getWindowAncestor(c);
1010 if (!w.isOpaque()) {
1011 Toolkit tk = Toolkit.getDefaultToolkit();
1012 if ((tk instanceof SunToolkit) && (((SunToolkit)tk).needUpdateWindow())) {
1013 return null;
1014 }
1015 }
1016
1017 if (standardDoubleBuffer == null) {
1465 return false;
1466 }
1467
1468 /**
1469 * Invoked when the doubleBuffered or useTrueDoubleBuffering
1470 * properties of a JRootPane change. This may come in on any thread.
1471 */
1472 public void doubleBufferingChanged(JRootPane rootPane) {
1473 }
1474
1475 /**
1476 * Paints a portion of a component to an offscreen buffer.
1477 */
1478 protected void paintDoubleBuffered(JComponent c, Image image,
1479 Graphics g, int clipX, int clipY,
1480 int clipW, int clipH) {
1481 Graphics osg = image.getGraphics();
1482 int bw = Math.min(clipW, image.getWidth(null));
1483 int bh = Math.min(clipH, image.getHeight(null));
1484 int x,y,maxx,maxy;
1485 final Toolkit tk = Toolkit.getDefaultToolkit();
1486 final boolean isTranslucent = (tk instanceof SunToolkit)
1487 && ((SunToolkit) tk).isSwingBackbufferTranslucencySupported();
1488
1489 try {
1490 for(x = clipX, maxx = clipX+clipW; x < maxx ; x += bw ) {
1491 for(y=clipY, maxy = clipY + clipH; y < maxy ; y += bh) {
1492 osg.translate(-x, -y);
1493 osg.setClip(x,y,bw,bh);
1494 if (isTranslucent && osg instanceof Graphics2D) {
1495 Graphics2D g2d = (Graphics2D) osg.create();
1496 g2d.setBackground(c.getBackground());
1497 g2d.clearRect(x, y, bw, bh);
1498 }
1499 c.paintToOffscreen(osg, x, y, bw, bh, maxx, maxy);
1500 g.setClip(x, y, bw, bh);
1501 if (isTranslucent && g instanceof Graphics2D) {
1502 Graphics2D g2d = (Graphics2D) g.create();
1503 g2d.setComposite(AlphaComposite.Src);
1504 g2d.drawImage(image, x, y, c);
1505 } else {
1506 g.drawImage(image, x, y, c);
1507 }
1508 osg.translate(x, y);
1509 }
1510 }
1511 } finally {
1512 osg.dispose();
1513 }
1514 }
1515
1516 /**
1517 * If <code>image</code> is non-null with a positive size it
1518 * is returned, otherwise null is returned.
1519 */
1520 private Image getValidImage(Image image) {
1521 if (image != null && image.getWidth(null) > 0 &&
1522 image.getHeight(null) > 0) {
1523 return image;
1524 }
1525 return null;
1526 }
1527
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