Migrate remaining OldSchoolEffect examples to GraphicsExample

Completes the migration tracked in #3189 by adding the remaining 11
effects plus Lake:

Phase 2 (image-based):
- Wobble (bu.jpg)
- Wormhole (texture.png)
- Dancing (with light)
- Lake (ash.jpg) - reimplemented with direct pixel manipulation so
  the mirror/wave effect renders consistently on Linux, where
  GC.copyArea on image-backed GCs differed from Win32/Cocoa. Uses
  ImageData.transparentPixel for out-of-range reflection rows and a
  10 px seam between image and mirror so ash.jpg's near-black edges
  don't show as moving dark bands.

Phase 3 (complex):
- RotoZoom (tux256256.png)
- Tunnel (tunnelstonetex.png)
- Voxel (heightmap1.gif + colormap.jpg)
- Sine Scroll (font_classic_16x16.gif, Star as inner class)
- Simple Scroll
- Advanced Scroll
- Star Wars Scroll (row-wise scaling for perspective)

Polish applied across the tabs based on visual review:
- Enlarge small renders via scale-on-draw: Twirl 3x, BlockEffect 3x,
  Sky/SineScroll/Ripple 2x. Enlarge Tunnel (640x480) and Voxel
  (640x400) render buffers.
- Ripple: seed 6 ripples at startup, drop automatic ripples so the
  effect is visible without mouse input, overlay a hint telling the
  user to hover.
- BlockEffect: hold the unblocked image for ~40 frames before starting
  to blockify again.
- SimpleScroll / StarWarsScroll: credit Laurent Caron in the scrolling
  text.

Closes #3189

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vogella

examples/org.eclipse.swt.examples/src/examples_graphics.properties

@@ -190,6 +190,7 @@ StarPolygonDescription=This tab draws a polygon and shows the effects of setting
 AntialiasingTextDesc=This tab demonstrates antialiasing for text. Antialiasing is used for smoothing jagged edges in graphics. This tab allows the user to see the effects of different antialiasing values.
 Ripple=Ripple
 RippleDescription=This is a miscellaneous demonstration that uses a displacement map to simulate water ripples on an image. Move the mouse over the image to disturb the water.
+RippleHint=Move the mouse over the image to create ripples
 
 Blob=Blob
 BlobDescription=This is a miscellaneous demonstration of an animated metaball effect where multiple blobs move randomly and blend together when overlapping.
@@ -256,3 +257,36 @@ UnlimitedBallsDescription=This is a miscellaneous demonstration of an animated u
 
 Warp=Warp
 WarpDescription=This is a miscellaneous demonstration of an animated warp distortion effect that uses a precomputed distortion lookup table to render a texture with animated warping.
+
+Wobble=Wobble
+WobbleDescription=This is a miscellaneous demonstration of an animated wobble distortion that warps a texture with rotating sine/cosine deformations.
+
+Wormhole=Wormhole
+WormholeDescription=This is a miscellaneous demonstration of an animated wormhole effect produced by mapping a precomputed spoke pattern to a scrolling texture.
+
+Lake=Lake
+LakeDescription=This is a miscellaneous demonstration of an animated lake reflection where the bottom half shows a wave-distorted mirror of the source image.
+
+DancingLight=Dancing (with light)
+DancingLightDescription=This is a miscellaneous demonstration of an animated isometric dancing shape illuminated by a moving point light source.
+
+RotoZoom=Roto Zoom
+RotoZoomDescription=This is a miscellaneous demonstration of an animated rotozoom effect where a tiling texture is rotated and zoomed using precomputed sine tables.
+
+Tunnel=Tunnel
+TunnelDescription=This is a miscellaneous demonstration of an animated tunnel effect using a precomputed distance and angle lookup table mapped against a scrolling stone texture.
+
+Voxel=Voxel
+VoxelDescription=This is a miscellaneous demonstration of an animated voxel terrain rendered by raycasting against a heightmap and colormap, with the camera automatically flying over the landscape.
+
+SineScroll=Sine Scroll
+SineScrollDescription=This is a miscellaneous demonstration of an animated sine-scroller: a classic amiga-style banner text flying across a starfield and gradient bars along a sine curve.
+
+SimpleScroll=Simple Scroll
+SimpleScrollDescription=This is a miscellaneous demonstration of a simple vertical text scroller that loops a block of centered lines from the bottom of the canvas upward.
+
+AdvancedScroll=Advanced Scroll
+AdvancedScrollDescription=This is a miscellaneous demonstration of a vertical text scroller with top and bottom gradient fade effects so lines smoothly appear from the bottom and vanish into the top.
+
+StarWarsScroll=Star Wars Scroll
+StarWarsScrollDescription=This is a miscellaneous demonstration of a Star Wars style scroller: text scrolls up the canvas and a row-wise scaling transform tapers the lines toward the horizon to give a perspective effect.

examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/AdvancedScrollTab.java

@@ -0,0 +1,129 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Laurent Caron and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Laurent Caron (laurent.caron at gmail dot com) - Initial Contributor
+ *     IBM Corporation - adaptation to GraphicsExample
+ *******************************************************************************/
+
+package org.eclipse.swt.examples.graphics;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Point;
+
+/**
+ * This tab displays a vertical text scroller with top and bottom gradient fade
+ * effects so lines smoothly appear from the bottom and vanish into the top.
+ */
+public class AdvancedScrollTab extends AnimatedGraphicsTab {
+
+	private static final int FONT_SIZE = 14;
+	private static final int STEP = 1;
+	private static final String[] LINES = {
+		"SWT Graphics Example",
+		"Advanced Scroll Effect",
+		"",
+		"Lines scroll up the screen",
+		"with a gradient fade on",
+		"the top and bottom edges.",
+		"",
+		"Enjoy the show!",
+	};
+
+	private int y = -1;
+	private int lastHeight;
+
+	public AdvancedScrollTab(GraphicsExample example) {
+		super(example);
+	}
+
+	@Override
+	public String getCategory() {
+		return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$
+	}
+
+	@Override
+	public String getText() {
+		return GraphicsExample.getResourceString("AdvancedScroll"); //$NON-NLS-1$
+	}
+
+	@Override
+	public String getDescription() {
+		return GraphicsExample.getResourceString("AdvancedScrollDescription"); //$NON-NLS-1$
+	}
+
+	@Override
+	public int getInitialAnimationTime() {
+		return 10;
+	}
+
+	@Override
+	public void next(int width, int height) {
+		if (y < 0 || height != lastHeight) {
+			y = height + 10;
+			lastHeight = height;
+		}
+		y -= STEP;
+	}
+
+	@Override
+	public void paint(GC gc, int width, int height) {
+		if (y < 0) {
+			y = height + 10;
+			lastHeight = height;
+		}
+
+		gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_BLACK));
+		gc.fillRectangle(0, 0, width, height);
+
+		Font font = new Font(gc.getDevice(), "Lucida Sans", FONT_SIZE, SWT.NORMAL); //$NON-NLS-1$
+		Font previous = gc.getFont();
+		gc.setFont(font);
+		gc.setForeground(gc.getDevice().getSystemColor(SWT.COLOR_WHITE));
+		gc.setAdvanced(true);
+		gc.setAntialias(SWT.ON);
+
+		int currentY = y;
+		for (String line : LINES) {
+			Point ts = gc.stringExtent(line);
+			int x = (width - ts.x) / 2;
+			gc.drawString(line, x, currentY, true);
+			currentY += (int) (ts.y * 1.5);
+		}
+
+		if (currentY <= 0) {
+			y = height + 10;
+		}
+
+		gc.setFont(previous);
+		font.dispose();
+
+		int maxSize = (int) (height * 0.1);
+		if (maxSize > 0) {
+			int step = 255 / maxSize;
+			gc.setForeground(gc.getDevice().getSystemColor(SWT.COLOR_BLACK));
+			int alpha = 255;
+			for (int i = 0; i < maxSize; i++) {
+				gc.setAlpha(alpha);
+				gc.drawLine(0, i, width, i);
+				alpha -= step;
+			}
+			alpha = 255;
+			for (int i = 0; i < maxSize; i++) {
+				gc.setAlpha(alpha);
+				gc.drawLine(0, height - 1 - i, width, height - 1 - i);
+				alpha -= step;
+			}
+			gc.setAlpha(255);
+		}
+	}
+}

examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/BlockEffectTab.java

@@ -26,12 +26,15 @@
  */
 public class BlockEffectTab extends AnimatedGraphicsTab {
 
+	private static final int DISPLAY_SCALE = 3;
+
 	private ImageData sourceImage;
 	private ImageData imageData;
 	private Image outputImage;
 	private int imgWidth, imgHeight;
 	private int blockSize;
 	private int direction;
+	private int holdFrames;
 
 	public BlockEffectTab(GraphicsExample example) {
 		super(example);
@@ -72,11 +75,20 @@ public void next(int width, int height) {
 		}
 
 		imageData = filter(sourceImage, blockSize);
+
+		// Hold the unblocked (blockSize=1) state for ~40 frames so the real
+		// image is visible before blocks start growing again.
+		if (holdFrames > 0) {
+			holdFrames--;
+			return;
+		}
+
 		blockSize += direction;
 
 		if (blockSize <= 1) {
 			direction = 1;
 			blockSize = 1;
+			holdFrames = 40;
 		}
 
 		if (blockSize >= imgWidth / 4) {
@@ -113,9 +125,11 @@ public void paint(GC gc, int width, int height) {
 		}
 		outputImage = new Image(gc.getDevice(), imageData);
 
-		int x = (width - imgWidth) / 2;
-		int y = (height - imgHeight) / 2;
-		gc.drawImage(outputImage, x, y);
+		int dw = imgWidth * DISPLAY_SCALE;
+		int dh = imgHeight * DISPLAY_SCALE;
+		int x = (width - dw) / 2;
+		int y = (height - dh) / 2;
+		gc.drawImage(outputImage, 0, 0, imgWidth, imgHeight, x, y, dw, dh);
 	}
 
 	private ImageData filter(ImageData src, int size) {