vnccanvas.java

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    int dx, dy, n;
    int i = y * rfb.framebufferWidth + x;
    int rowBytes = (w + 7) / 8;
    byte b;

    for (dy = 0; dy < h; dy++) {
      for (dx = 0; dx < w / 8; dx++) {
	b = src[dy*rowBytes+dx];
	for (n = 7; n >= 0; n--)
	  pixels8[i++] = palette[b >> n & 1];
      }
      for (n = 7; n >= 8 - w % 8; n--) {
	pixels8[i++] = palette[src[dy*rowBytes+dx] >> n & 1];
      }
      i += (rfb.framebufferWidth - w);
    }
  }

  void decodeMonoData(int x, int y, int w, int h, byte[] src, int[] palette) {

    int dx, dy, n;
    int i = y * rfb.framebufferWidth + x;
    int rowBytes = (w + 7) / 8;
    byte b;

    for (dy = 0; dy < h; dy++) {
      for (dx = 0; dx < w / 8; dx++) {
	b = src[dy*rowBytes+dx];
	for (n = 7; n >= 0; n--)
	  pixels24[i++] = palette[b >> n & 1];
      }
      for (n = 7; n >= 8 - w % 8; n--) {
	pixels24[i++] = palette[src[dy*rowBytes+dx] >> n & 1];
      }
      i += (rfb.framebufferWidth - w);
    }
  }

  //
  // Decode data processed with the "Gradient" filter.
  //

  void decodeGradientData (int x, int y, int w, int h, byte[] buf) {

    int dx, dy, c;
    byte[] prevRow = new byte[w * 3];
    byte[] thisRow = new byte[w * 3];
    byte[] pix = new byte[3];
    int[] est = new int[3];

    int offset = y * rfb.framebufferWidth + x;

    for (dy = 0; dy < h; dy++) {

      /* First pixel in a row */
      for (c = 0; c < 3; c++) {
	pix[c] = (byte)(prevRow[c] + buf[dy * w * 3 + c]);
	thisRow[c] = pix[c];
      }
      pixels24[offset++] =
	(pix[0] & 0xFF) << 16 | (pix[1] & 0xFF) << 8 | (pix[2] & 0xFF);

      /* Remaining pixels of a row */
      for (dx = 1; dx < w; dx++) {
	for (c = 0; c < 3; c++) {
	  est[c] = ((prevRow[dx * 3 + c] & 0xFF) + (pix[c] & 0xFF) -
		    (prevRow[(dx-1) * 3 + c] & 0xFF));
	  if (est[c] > 0xFF) {
	    est[c] = 0xFF;
	  } else if (est[c] < 0x00) {
	    est[c] = 0x00;
	  }
	  pix[c] = (byte)(est[c] + buf[(dy * w + dx) * 3 + c]);
	  thisRow[dx * 3 + c] = pix[c];
	}
	pixels24[offset++] =
	  (pix[0] & 0xFF) << 16 | (pix[1] & 0xFF) << 8 | (pix[2] & 0xFF);
      }

      System.arraycopy(thisRow, 0, prevRow, 0, w * 3);
      offset += (rfb.framebufferWidth - w);
    }
  }

  //
  // Display newly updated area of pixels.
  //

  void handleUpdatedPixels(int x, int y, int w, int h) {

    // Draw updated pixels of the off-screen image.
    pixelsSource.newPixels(x, y, w, h);
    memGraphics.setClip(x, y, w, h);
    memGraphics.drawImage(rawPixelsImage, 0, 0, null);
    memGraphics.setClip(0, 0, rfb.framebufferWidth, rfb.framebufferHeight);
  }

  //
  // Tell JVM to repaint specified desktop area.
  //

  void scheduleRepaint(int x, int y, int w, int h) {
    // Request repaint, deferred if necessary.
    if (rfb.framebufferWidth == scaledWidth) {
      repaint(viewer.deferScreenUpdates, x, y, w, h);
    } else {
      int sx = x * scalingFactor / 100;
      int sy = y * scalingFactor / 100;
      int sw = ((x + w) * scalingFactor + 49) / 100 - sx + 1;
      int sh = ((y + h) * scalingFactor + 49) / 100 - sy + 1;
      repaint(viewer.deferScreenUpdates, sx, sy, sw, sh);
    }
  }

  //
  // Handle events.
  //

  public void keyPressed(KeyEvent evt) {
    processLocalKeyEvent(evt);
  }
  public void keyReleased(KeyEvent evt) {
    processLocalKeyEvent(evt);
  }
  public void keyTyped(KeyEvent evt) {
    evt.consume();
  }

  public void mousePressed(MouseEvent evt) {
    processLocalMouseEvent(evt, false);
  }
  public void mouseReleased(MouseEvent evt) {
    processLocalMouseEvent(evt, false);
  }
  public void mouseMoved(MouseEvent evt) {
    processLocalMouseEvent(evt, true);
  }
  public void mouseDragged(MouseEvent evt) {
    processLocalMouseEvent(evt, true);
  }

  public void processLocalKeyEvent(KeyEvent evt) {
    if (viewer.rfb != null && rfb.inNormalProtocol) {
      if (!inputEnabled) {
	if ((evt.getKeyChar() == 'r' || evt.getKeyChar() == 'R') &&
	    evt.getID() == KeyEvent.KEY_PRESSED ) {
	  // Request screen update.
	  try {
	    rfb.writeFramebufferUpdateRequest(0, 0, rfb.framebufferWidth,
					      rfb.framebufferHeight, false);
	  } catch (IOException e) {
	    e.printStackTrace();
	  }
	}
      } else {
	// Input enabled.
	synchronized(rfb) {
	  try {
	    rfb.writeKeyEvent(evt);
	  } catch (Exception e) {
	    e.printStackTrace();
	  }
	  rfb.notify();
	}
      }
    }
    // Don't ever pass keyboard events to AWT for default processing. 
    // Otherwise, pressing Tab would switch focus to ButtonPanel etc.
    evt.consume();
  }

  public void processLocalMouseEvent(MouseEvent evt, boolean moved) {
    if (viewer.rfb != null && rfb.inNormalProtocol) {
      if (moved) {
	softCursorMove(evt.getX(), evt.getY());
      }
      if (rfb.framebufferWidth != scaledWidth) {
        int sx = (evt.getX() * 100 + scalingFactor/2) / scalingFactor;
        int sy = (evt.getY() * 100 + scalingFactor/2) / scalingFactor;
        evt.translatePoint(sx - evt.getX(), sy - evt.getY());
      }
      synchronized(rfb) {
	try {
	  rfb.writePointerEvent(evt);
	} catch (Exception e) {
	  e.printStackTrace();
	}
	rfb.notify();
      }
    }
  }

  //
  // Ignored events.
  //

  public void mouseClicked(MouseEvent evt) {}
  public void mouseEntered(MouseEvent evt) {}
  public void mouseExited(MouseEvent evt) {}


  //////////////////////////////////////////////////////////////////
  //
  // Handle cursor shape updates (XCursor and RichCursor encodings).
  //

  boolean showSoftCursor = false;

  MemoryImageSource softCursorSource;
  Image softCursor;

  int cursorX = 0, cursorY = 0;
  int cursorWidth, cursorHeight;
  int origCursorWidth, origCursorHeight;
  int hotX, hotY;
  int origHotX, origHotY;

  //
  // Handle cursor shape update (XCursor and RichCursor encodings).
  //

  synchronized void
    handleCursorShapeUpdate(int encodingType,
			    int xhot, int yhot, int width, int height)
    throws IOException {

    softCursorFree();

    if (width * height == 0)
      return;

    // Ignore cursor shape data if requested by user.
    if (viewer.options.ignoreCursorUpdates) {
      int bytesPerRow = (width + 7) / 8;
      int bytesMaskData = bytesPerRow * height;

      if (encodingType == rfb.EncodingXCursor) {
	rfb.is.skipBytes(6 + bytesMaskData * 2);
      } else {
	// rfb.EncodingRichCursor
	rfb.is.skipBytes(width * height + bytesMaskData);
      }
      return;
    }

    // Decode cursor pixel data.
    softCursorSource = decodeCursorShape(encodingType, width, height);

    // Set original (non-scaled) cursor dimensions.
    origCursorWidth = width;
    origCursorHeight = height;
    origHotX = xhot;
    origHotY = yhot;

    // Create off-screen cursor image.
    createSoftCursor();

    // Show the cursor.
    showSoftCursor = true;
    repaint(viewer.deferCursorUpdates,
	    cursorX - hotX, cursorY - hotY, cursorWidth, cursorHeight);
  }

  //
  // decodeCursorShape(). Decode cursor pixel data and return
  // corresponding MemoryImageSource instance.
  //

  synchronized MemoryImageSource
    decodeCursorShape(int encodingType, int width, int height)
    throws IOException {

    int bytesPerRow = (width + 7) / 8;
    int bytesMaskData = bytesPerRow * height;

    int[] softCursorPixels = new int[width * height];

    if (encodingType == rfb.EncodingXCursor) {

      // Read foreground and background colors of the cursor.
      byte[] rgb = new byte[6];
      rfb.readFully(rgb);
      int[] colors = { (0xFF000000 | (rgb[3] & 0xFF) << 16 |
			(rgb[4] & 0xFF) << 8 | (rgb[5] & 0xFF)),
		       (0xFF000000 | (rgb[0] & 0xFF) << 16 |
			(rgb[1] & 0xFF) << 8 | (rgb[2] & 0xFF)) };

      // Read pixel and mask data.
      byte[] pixBuf = new byte[bytesMaskData];
      rfb.readFully(pixBuf);
      byte[] maskBuf = new byte[bytesMaskData];
      rfb.readFully(maskBuf);

      // Decode pixel data into softCursorPixels[].
      byte pixByte, maskByte;
      int x, y, n, result;
      int i = 0;
      for (y = 0; y < height; y++) {
	for (x = 0; x < width / 8; x++) {
	  pixByte = pixBuf[y * bytesPerRow + x];
	  maskByte = maskBuf[y * bytesPerRow + x];
	  for (n = 7; n >= 0; n--) {
	    if ((maskByte >> n & 1) != 0) {
	      result = colors[pixByte >> n & 1];
	    } else {
	      result = 0;	// Transparent pixel
	    }
	    softCursorPixels[i++] = result;
	  }
	}
	for (n = 7; n >= 8 - width % 8; n--) {
	  if ((maskBuf[y * bytesPerRow + x] >> n & 1) != 0) {
	    result = colors[pixBuf[y * bytesPerRow + x] >> n & 1];
	  } else {
	    result = 0;		// Transparent pixel
	  }
	  softCursorPixels[i++] = result;
	}
      }

    } else {
      // encodingType == rfb.EncodingRichCursor

      // Read pixel and mask data.
      byte[] pixBuf = new byte[width * height * bytesPixel];
      rfb.readFully(pixBuf);
      byte[] maskBuf = new byte[bytesMaskData];
      rfb.readFully(maskBuf);

      // Decode pixel data into softCursorPixels[].
      byte pixByte, maskByte;
      int x, y, n, result;
      int i = 0;
      for (y = 0; y < height; y++) {
	for (x = 0; x < width / 8; x++) {
	  maskByte = maskBuf[y * bytesPerRow + x];
	  for (n = 7; n >= 0; n--) {
	    if ((maskByte >> n & 1) != 0) {
	      if (bytesPixel == 1) {
		result = cm8.getRGB(pixBuf[i]);
	      } else {
		result = 0xFF000000 |
		  (pixBuf[i * 4 + 2] & 0xFF) << 16 |
		  (pixBuf[i * 4 + 1] & 0xFF) << 8 |
		  (pixBuf[i * 4] & 0xFF);
	      }
	    } else {
	      result = 0;	// Transparent pixel
	    }
	    softCursorPixels[i++] = result;
	  }
	}
	for (n = 7; n >= 8 - width % 8; n--) {
	  if ((maskBuf[y * bytesPerRow + x] >> n & 1) != 0) {
	    if (bytesPixel == 1) {
	      result = cm8.getRGB(pixBuf[i]);
	    } else {
	      result = 0xFF000000 |
		(pixBuf[i * 4 + 2] & 0xFF) << 16 |
		(pixBuf[i * 4 + 1] & 0xFF) << 8 |
		(pixBuf[i * 4] & 0xFF);
	    }
	  } else {
	    result = 0;		// Transparent pixel
	  }
	  softCursorPixels[i++] = result;
	}
      }

    }

    return new MemoryImageSource(width, height, softCursorPixels, 0, width);
  }

  //
  // createSoftCursor(). Assign softCursor new Image (scaled if necessary).
  // Uses softCursorSource as a source for new cursor image.
  //

  synchronized void
    createSoftCursor() {

    if (softCursorSource == null)
      return;

    int scaleCursor = viewer.options.scaleCursor;
    if (scaleCursor == 0 || !inputEnabled)
      scaleCursor = 100;

    // Save original cursor coordinates.
    int x = cursorX - hotX;
    int y = cursorY - hotY;
    int w = cursorWidth;
    int h = cursorHeight;

    cursorWidth = (origCursorWidth * scaleCursor + 50) / 100;
    cursorHeight = (origCursorHeight * scaleCursor + 50) / 100;
    hotX = (origHotX * scaleCursor + 50) / 100;
    hotY = (origHotY * scaleCursor + 50) / 100;
    softCursor = Toolkit.getDefaultToolkit().createImage(softCursorSource);

    if (scaleCursor != 100) {
      softCursor = softCursor.getScaledInstance(cursorWidth, cursorHeight,
						Image.SCALE_SMOOTH);
    }

    if (showSoftCursor) {
      // Compute screen area to update.
      x = Math.min(x, cursorX - hotX);
      y = Math.min(y, cursorY - hotY);
      w = Math.max(w, cursorWidth);
      h = Math.max(h, cursorHeight);

      repaint(viewer.deferCursorUpdates, x, y, w, h);
    }
  }

  //
  // softCursorMove(). Moves soft cursor into a particular location.
  //

  synchronized void softCursorMove(int x, int y) {
    int oldX = cursorX;
    int oldY = cursorY;
    cursorX = x;
    cursorY = y;
    if (showSoftCursor) {
      repaint(viewer.deferCursorUpdates,
	      oldX - hotX, oldY - hotY, cursorWidth, cursorHeight);
      repaint(viewer.deferCursorUpdates,
	      cursorX - hotX, cursorY - hotY, cursorWidth, cursorHeight);
    }
  }

  //
  // softCursorFree(). Remove soft cursor, dispose resources.
  //

  synchronized void softCursorFree() {
    if (showSoftCursor) {
      showSoftCursor = false;
      softCursor = null;
      softCursorSource = null;

      repaint(viewer.deferCursorUpdates,
	      cursorX - hotX, cursorY - hotY, cursorWidth, cursorHeight);
    }
  }
}