Add internal API in SVGrasterizer to rasterize images at given height and width

Adding internal API to SVGRasterizer and simple tests to see if the svgs
are loaded at right sizes by the rasterizer

Author: arunjose696

bundles/org.eclipse.swt.svg/src/org/eclipse/swt/svg/JSVGRasterizer.java

@@ -72,34 +72,44 @@ public class JSVGRasterizer implements SVGRasterizer {
 
 	@Override
 	public ImageData rasterizeSVG(InputStream inputStream, int zoom) throws IOException {
-		SVGDocument svgDocument = loadSVG(inputStream);
-		if (svgDocument == null) {
-			SWT.error(SWT.ERROR_INVALID_IMAGE);
-		}
+		SVGDocument svgDocument = loadAndValidateSVG(inputStream);
 		BufferedImage rasterizedImage = renderSVG(svgDocument, zoom);
 		return convertToSWTImageData(rasterizedImage);
 	}
-
-	private SVGDocument loadSVG(InputStream inputStream) {
-		return SVG_LOADER.load(inputStream, null, LoaderContext.createDefault());
+	
+	@Override
+	public ImageData rasterizeSVG(InputStream inputStream, int width, int height) throws IOException {
+		SVGDocument svgDocument = loadAndValidateSVG(inputStream);
+		BufferedImage rasterizedImage = renderSVG(svgDocument, width, height);
+		return convertToSWTImageData(rasterizedImage);
+	}
+	
+	private SVGDocument loadAndValidateSVG(InputStream inputStream) throws IOException {
+		SVGDocument svgDocument = SVG_LOADER.load(inputStream, null, LoaderContext.createDefault());
+		if (svgDocument == null) {
+			SWT.error(SWT.ERROR_INVALID_IMAGE);
+		}
+		return svgDocument;
 	}
 
 	private BufferedImage renderSVG(SVGDocument svgDocument, int zoom) {
+		FloatSize sourceImageSize = svgDocument.size();
 		float scalingFactor = zoom / 100.0f;
-		BufferedImage image = createImageBase(svgDocument, scalingFactor);
-		Graphics2D g = configureRenderingOptions(scalingFactor, image);
+		int targetImageWidth = calculateTargetWidth(scalingFactor, sourceImageSize);
+		int targetImageHeight = calculateTargetHeight(scalingFactor, sourceImageSize);
+		return renderSVG(svgDocument, targetImageWidth, targetImageHeight);
+	}
+	
+	private BufferedImage renderSVG(SVGDocument svgDocument, int width, int height) {
+		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
+		float widthScalingFactor = width / svgDocument.size().width;
+		float heightScalingFactor = height / svgDocument.size().height;
+		Graphics2D g = configureRenderingOptions(widthScalingFactor, heightScalingFactor, image);
 		svgDocument.render(null, g);
 		g.dispose();
 		return image;
 	}
 
-	private BufferedImage createImageBase(SVGDocument svgDocument, float scalingFactor) {
-		FloatSize sourceImageSize = svgDocument.size();
-		int targetImageWidth = calculateTargetWidth(scalingFactor, sourceImageSize);
-		int targetImageHeight = calculateTargetHeight(scalingFactor, sourceImageSize);
-		return new BufferedImage(targetImageWidth, targetImageHeight, BufferedImage.TYPE_INT_ARGB);
-	}
-
 	private int calculateTargetWidth(float scalingFactor, FloatSize sourceImageSize) {
 		double sourceImageWidth = sourceImageSize.getWidth();
 		return (int) Math.round(sourceImageWidth * scalingFactor);
@@ -110,10 +120,10 @@ private int calculateTargetHeight(float scalingFactor, FloatSize sourceImageSize
 		return (int) Math.round(sourceImageHeight * scalingFactor);
 	}
 
-	private Graphics2D configureRenderingOptions(float scalingFactor, BufferedImage image) {
+	private Graphics2D configureRenderingOptions(float widthScalingFactor, float heightScalingFactor, BufferedImage image) {
 		Graphics2D g = image.createGraphics();
 		g.setRenderingHints(RENDERING_HINTS);
-		g.scale(scalingFactor, scalingFactor);
+		g.scale(widthScalingFactor, heightScalingFactor);
 		return g;
 	}
 

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/internal/image/SVGRasterizer.java

@@ -32,4 +32,6 @@ public interface SVGRasterizer {
 	 *         the input is not a valid SVG file or cannot be processed.
 	 */
 	public ImageData rasterizeSVG(InputStream stream, int zoom) throws IOException;
+	
+	public ImageData rasterizeSVG(InputStream stream, int width, int height) throws IOException;
 }

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/JSVGRasterizerTest.java

@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2024, 2025 Yatta Solutions 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:
+ *     Yatta Solutions - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.tests.junit;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.svg.JSVGRasterizer;
+import org.junit.jupiter.api.Test;
+
+class JSVGRasterizerTest {
+
+    private final JSVGRasterizer rasterizer = new JSVGRasterizer();
+    private String svgString = """
+    		<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
+    		    <rect width="100%" height="100%"/>
+    		</svg>
+    		""";
+    private ByteArrayInputStream svgStream(String svg) {
+        return new ByteArrayInputStream(svg.getBytes(StandardCharsets.UTF_8));
+    }
+
+    @Test
+    void testRasterizeWithZoom() throws IOException {
+        ImageData data = rasterizer.rasterizeSVG(svgStream(svgString), 200);
+        assertEquals(200, data.width);
+        assertEquals(200, data.height);
+    }
+
+    @Test
+    void testRasterizeWithWidthHeight() throws IOException {
+        ImageData data = rasterizer.rasterizeSVG(svgStream(svgString), 300, 150);
+        assertEquals(300, data.width);
+        assertEquals(150, data.height);
+    }
+
+
+}