imageanalyzer.java

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		try {
			// Cache the new image and imageData.
			image = new Image(display, newImageData);
			imageData = newImageData;

		} catch (SWTException e) {
			showErrorDialog(bundle.getString("Creating_from") + " ", currentName, e);
			image = null;
			return;
		}

		// Update the widgets with the new image info.
		String string = createMsg(bundle.getString("Analyzer_on"), currentName);
		shell.setText(string);

		if (imageDataArray.length > 1) {
			string = createMsg(bundle.getString("Type_index"), 
			                   new Object[] {fileTypeString(imageData.type),
			                                 new Integer(imageDataIndex + 1),
			                                 new Integer(imageDataArray.length)});
		} else {
			string = createMsg(bundle.getString("Type_string"), fileTypeString(imageData.type));
		}
		typeLabel.setText(string);

		string = createMsg(bundle.getString("Size_value"), 
					 new Object[] {new Integer(imageData.width),
							   new Integer(imageData.height)});
		sizeLabel.setText(string);

		string = createMsg(bundle.getString("Depth_value"), new Integer(imageData.depth));
		depthLabel.setText(string);

		string = createMsg(bundle.getString("Transparent_pixel_value"), pixelInfo(imageData.transparentPixel));
		transparentPixelLabel.setText(string);

		string = createMsg(bundle.getString("Time_to_load_value"), new Long(loadTime));
		timeToLoadLabel.setText(string);

		string = createMsg(bundle.getString("Animation_size_value"), 
		                      new Object[] {new Integer(loader.logicalScreenWidth),
								new Integer(loader.logicalScreenHeight)});
		screenSizeLabel.setText(string);

		string = createMsg(bundle.getString("Background_pixel_value"), pixelInfo(loader.backgroundPixel));
		backgroundPixelLabel.setText(string);

		string = createMsg(bundle.getString("Image_location_value"), 
		                      new Object[] {new Integer(imageData.x), new Integer(imageData.y)});
		locationLabel.setText(string);

		string = createMsg(bundle.getString("Disposal_value"),
		                      new Object[] {new Integer(imageData.disposalMethod),
							      disposalString(imageData.disposalMethod)});
		disposalMethodLabel.setText(string);

		int delay = imageData.delayTime * 10;
		int delayUsed = visibleDelay(delay);
		if (delay != delayUsed) {
			string = createMsg(bundle.getString("Delay_value"), 
			                   new Object[] {new Integer(delay), new Integer(delayUsed)});
		} else {
			string = createMsg(bundle.getString("Delay_used"), new Integer(delay));
		}
		delayTimeLabel.setText(string);

		if (loader.repeatCount == 0) {
			string = createMsg( bundle.getString("Repeats_forever"), new Integer(loader.repeatCount));
		} else {
			string = createMsg(bundle.getString("Repeats_value"), new Integer(loader.repeatCount));
		}
		repeatCountLabel.setText(string);


		if (imageData.palette.isDirect) {
			string = bundle.getString("Palette_direct");
		} else {
			string = createMsg(bundle.getString("Palette_value"), new Integer(imageData.palette.getRGBs().length));
		}
		paletteLabel.setText(string);

		string = createMsg(bundle.getString("Pixel_data_value"), 
					 new Object[] {new Integer(imageData.bytesPerLine),
						         new Integer(imageData.scanlinePad),
							   depthInfo(imageData.depth)});
		dataLabel.setText(string);

		String data = dataHexDump(dataText.getLineDelimiter());
		dataText.setText(data);
		
		// bold the first column all the way down
		int index = 0;
		while((index = data.indexOf(':', index+1)) != -1) 
			dataText.setStyleRange(new StyleRange(index - INDEX_DIGITS, INDEX_DIGITS, dataText.getForeground(), dataText.getBackground(), SWT.BOLD));

		statusLabel.setText("");

		// Redraw both canvases.
		paletteCanvas.redraw();
		imageCanvas.redraw();
	}

	void paintImage(PaintEvent event) {
		Image paintImage = image;
		int transparentPixel = imageData.transparentPixel;
		if (transparentPixel != -1 && !transparent) {
			imageData.transparentPixel = -1;
			paintImage = new Image(display, imageData);
		}
		int w = Math.round(imageData.width * xscale);
		int h = Math.round(imageData.height * yscale);
		event.gc.drawImage(
			paintImage,
			0,
			0,
			imageData.width,
			imageData.height,
			ix + imageData.x,
			iy + imageData.y,
			w,
			h);
		if (showMask && (imageData.getTransparencyType() != SWT.TRANSPARENCY_NONE)) {
			ImageData maskImageData = imageData.getTransparencyMask();
			Image maskImage = new Image(display, maskImageData);
			event.gc.drawImage(
				maskImage,
				0,
				0,
				imageData.width,
				imageData.height,
				w + 10 + ix + imageData.x,
				iy + imageData.y,
				w,
				h);
			maskImage.dispose();
		}
		if (transparentPixel != -1 && !transparent) {
			imageData.transparentPixel = transparentPixel;
			paintImage.dispose();
		}
	}

	void paintPalette(PaintEvent event) {
		GC gc = event.gc;
		gc.fillRectangle(paletteCanvas.getClientArea());
		if (imageData.palette.isDirect) {
			// For a direct palette, display the masks.
			int y = py + 10;
			int xTab = 50;
			gc.drawString("rMsk", 10, y, true);
			gc.drawString(toHex4ByteString(imageData.palette.redMask), xTab, y, true);
			gc.drawString("gMsk", 10, y+=12, true);
			gc.drawString(toHex4ByteString(imageData.palette.greenMask), xTab, y, true);
			gc.drawString("bMsk", 10, y+=12, true);
			gc.drawString(toHex4ByteString(imageData.palette.blueMask), xTab, y, true);
			gc.drawString("rShf", 10, y+=12, true);
			gc.drawString(Integer.toString(imageData.palette.redShift), xTab, y, true);
			gc.drawString("gShf", 10, y+=12, true);
			gc.drawString(Integer.toString(imageData.palette.greenShift), xTab, y, true);
			gc.drawString("bShf", 10, y+=12, true);
			gc.drawString(Integer.toString(imageData.palette.blueShift), xTab, y, true);
		} else {
			// For an indexed palette, display the palette colors and indices.
			RGB[] rgbs = imageData.palette.getRGBs();
			if (rgbs != null) {
				int xTab1 = 40, xTab2 = 100;
				for (int i = 0; i < rgbs.length; i++) {
					int y = (i+1) * 10 + py;
					gc.drawString(String.valueOf(i), 10, y, true);
					gc.drawString(toHexByteString(rgbs[i].red) + toHexByteString(rgbs[i].green) + toHexByteString(rgbs[i].blue), xTab1, y, true);
					Color color = new Color(display, rgbs[i]);
					gc.setBackground(color);
					gc.fillRectangle(xTab2, y+2, 10, 10);
					color.dispose();
				}
			}
		}
	}
	
	void resizeShell(ControlEvent event) {
		if (image == null || shell.isDisposed())
			return;
		resizeScrollBars();
	}

	// Reset the scale combos to 1.
	void resetScaleCombos() {
		xscale = 1; yscale = 1;
		scaleXCombo.select(scaleXCombo.indexOf("1"));
		scaleYCombo.select(scaleYCombo.indexOf("1"));
	}
	
	// Reset the scroll bars to 0.
	void resetScrollBars() {
		if (image == null) return;
		ix = 0; iy = 0; py = 0;
		resizeScrollBars();
		imageCanvas.getHorizontalBar().setSelection(0);
		imageCanvas.getVerticalBar().setSelection(0);
		paletteCanvas.getVerticalBar().setSelection(0);
	}
	
	void resizeScrollBars() {
		// Set the max and thumb for the image canvas scroll bars.
		ScrollBar horizontal = imageCanvas.getHorizontalBar();
		ScrollBar vertical = imageCanvas.getVerticalBar();
		Rectangle canvasBounds = imageCanvas.getClientArea();
		int width = Math.round(imageData.width * xscale);
		if (width > canvasBounds.width) {
			// The image is wider than the canvas.
			horizontal.setEnabled(true);
			horizontal.setMaximum(width);
			horizontal.setThumb(canvasBounds.width);
			horizontal.setPageIncrement(canvasBounds.width);
		} else {
			// The canvas is wider than the image.
			horizontal.setEnabled(false);
			if (ix != 0) {
				// Make sure the image is completely visible.
				ix = 0;
				imageCanvas.redraw();
			}
		}
		int height = Math.round(imageData.height * yscale);
		if (height > canvasBounds.height) {
			// The image is taller than the canvas.
			vertical.setEnabled(true);
			vertical.setMaximum(height);
			vertical.setThumb(canvasBounds.height);
			vertical.setPageIncrement(canvasBounds.height);
		} else {
			// The canvas is taller than the image.
			vertical.setEnabled(false);
			if (iy != 0) {
				// Make sure the image is completely visible.
				iy = 0;
				imageCanvas.redraw();
			}
		}

		// Set the max and thumb for the palette canvas scroll bar.
		vertical = paletteCanvas.getVerticalBar();
		if (imageData.palette.isDirect) {
			vertical.setEnabled(false);
		} else { // indexed palette
			canvasBounds = paletteCanvas.getClientArea();
			int paletteHeight = imageData.palette.getRGBs().length * 10 + 20; // 10 pixels each index + 20 for margins.
			vertical.setEnabled(true);
			vertical.setMaximum(paletteHeight);
			vertical.setThumb(canvasBounds.height);
			vertical.setPageIncrement(canvasBounds.height);
		}
	}

	/*
	 * Called when the image canvas' horizontal scrollbar is selected.
	 */
	void scrollHorizontally(ScrollBar scrollBar) {
		if (image == null) return;
		Rectangle canvasBounds = imageCanvas.getClientArea();
		int width = Math.round(imageData.width * xscale);
		int height = Math.round(imageData.height * yscale);
		if (width > canvasBounds.width) {
			// Only scroll if the image is bigger than the canvas.
			int x = -scrollBar.getSelection();
			if (x + width < canvasBounds.width) {
				// Don't scroll past the end of the image.
				x = canvasBounds.width - width;
			}
			imageCanvas.scroll(x, iy, ix, iy, width, height, false);
			ix = x;
		}
	}
	
	/*
	 * Called when the image canvas' vertical scrollbar is selected.
	 */
	void scrollVertically(ScrollBar scrollBar) {
		if (image == null) return;
		Rectangle canvasBounds = imageCanvas.getClientArea();
		int width = Math.round(imageData.width * xscale);
		int height = Math.round(imageData.height * yscale);
		if (height > canvasBounds.height) {
			// Only scroll if the image is bigger than the canvas.
			int y = -scrollBar.getSelection();
			if (y + height < canvasBounds.height) {
				// Don't scroll past the end of the image.
				y = canvasBounds.height - height;
			}
			imageCanvas.scroll(ix, y, ix, iy, width, height, false);
			iy = y;
		}
	}

	/*
	 * Called when the palette canvas' vertical scrollbar is selected.
	 */
	void scrollPalette(ScrollBar scrollBar) {
		if (image == null) return;
		Rectangle canvasBounds = paletteCanvas.getClientArea();
		int paletteHeight = imageData.palette.getRGBs().length * 10 + 20;
		if (paletteHeight > canvasBounds.height) {
			// Only scroll if the palette is bigger than the canvas.
			int y = -scrollBar.getSelection();
			if (y + paletteHeight < canvasBounds.height) {
				// Don't scroll past the end of the palette.
				y = canvasBounds.height - paletteHeight;
			}
			paletteCanvas.scroll(0, y, 0, py, paletteWidth, paletteHeight, false);
			py = y;
		}
	}

	/*
	 * Return a String containing a line-by-line dump of
	 * the data in the current imageData. The lineDelimiter
	 * parameter must be a string of length 1 or 2.
	 */
	String dataHexDump(String lineDelimiter) {
		if (image == null) return "";
		char[] dump = new char[imageData.height * (6 + 3 * imageData.bytesPerLine + lineDelimiter.length())];
		int index = 0;
		for (int i = 0; i < imageData.data.length; i++) {
			if (i % imageData.bytesPerLine == 0) {
				int line = i / imageData.bytesPerLine;
				dump[index++] = Character.forDigit(line / 1000 % 10, 10);
				dump[index++] = Character.forDigit(line / 100 % 10, 10);
				dump[index++] = Character.forDigit(line / 10 % 10, 10);
				dump[index++] = Character.forDigit(line % 10, 10);
				dump[index++] = ':';
				dump[index++] = ' ';
			}
			byte b = imageData.data[i];
			dump[index++] = Character.forDigit((b & 0xF0) >> 4, 16);
			dump[index++] = Character.forDigit(b & 0x0F, 16);
			dump[index++] = ' ';
			if ((i + 1) % imageData.bytesPerLine == 0) {
				dump[index++] = lineDelimiter.charAt(0);
				if (lineDelimiter.length() > 1)
					dump[index++] = lineDelimiter.charAt(1);
			}
		}
		return new String(dump);
	}
	
	/*
	 * Open an error dialog displaying the specified information.
	 */
	void showErrorDialog(String operation, String filename, Exception e) {
		MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
		String message = createMsg(bundle.getString("Error"), new String[] {operation, filename});
		String errorMessage = "";
		if (e != null) {
			if (e instanceof SWTException) {
				SWTException swte = (SWTException) e;
				errorMessage = swte.getMessage();
				if (swte.throwable != null) {
					errorMessage += ":\n" + swte.throwable.toString();
				}
			} else {
				errorMessage = e.toString();
			}
		}
		box.setMessage(message + errorMessage);
		box.open();
	}
	
	/*
	 * Return a String describing how to analyze the bytes
	 * in the hex dump.
	 */
	static String depthInfo(int depth) {
		Object[] args = {new Integer(depth), ""};
		switch (depth) {
			case 1:
				args[1] = createMsg(bundle.getString("Multi_pixels"), 
				                    new Object[] {new Integer(8), " [01234567]"});
				break;
			case 2:
				args[1] = createMsg(bundle.getString("Multi_pixels"),
				                    new Object[] {new Integer(4), "[00112233]"});
				break;
			case 4:
				args[1] = createMsg(bundle.getString("Multi_pixels"),
				                    new Object[] {new Integer(2), "[00001111]"});
				break;
			case 8: