Introduce SVG rasterizer logic

bundles/org.eclipse.swt.svg/.classpath

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="lib" path="libs/jsvg-1.6.1.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

bundles/org.eclipse.swt.svg/.project

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.eclipse.swt.svg</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

bundles/org.eclipse.swt.svg/.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=UTF-8

bundles/org.eclipse.swt.svg/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,9 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=17

bundles/org.eclipse.swt.svg/META-INF/MANIFEST.MF

@@ -0,0 +1,10 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: SvgPlugin
+Bundle-SymbolicName: org.eclipse.swt.svg
+Bundle-Version: 1.0.0.qualifier
+Automatic-Module-Name: org.eclipse.swt.svgPlugin
+Bundle-RequiredExecutionEnvironment: JavaSE-17
+Export-Package: org.eclipse.swt.svg
+Import-Package: org.eclipse.swt.graphics
+Bundle-ClassPath: ., libs/jsvg-1.6.1.jar

bundles/org.eclipse.swt.svg/build.properties

@@ -0,0 +1,5 @@
+source.. = src/
+output.. = bin/
+bin.includes = META-INF/,\
+               .,\
+               libs/jsvg-1.6.1.jar

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

@@ -0,0 +1,79 @@
+package org.eclipse.swt.svg;
+
+import static java.awt.RenderingHints.*;
+
+import java.awt.*;
+import java.awt.image.*;
+import java.io.*;
+import java.nio.charset.*;
+import java.util.*;
+import org.eclipse.swt.graphics.ISVGRasterizer;
+import org.eclipse.swt.graphics.SVGRasterizerRegistry;
+
+import com.github.weisj.jsvg.*;
+import com.github.weisj.jsvg.geometry.size.*;
+import com.github.weisj.jsvg.parser.*;
+
+/**
+ * A rasterizer implementation for converting SVG data into rasterized images.
+ * This class implements the {@code ISVGRasterizer} interface.
+ * 
+ * @since 3.128
+ */
+public class SVGRasterizer implements ISVGRasterizer {
+
+	/**
+     * Initializes the SVG rasterizer by registering an instance of this rasterizer 
+     * with the {@link SVGRasterizerRegistry}.
+     */
+	public static void intializeSVGRasterizer() {
+		SVGRasterizerRegistry.register(new SVGRasterizer());
+	}
+
+	private final static Map<Object, Object> RENDERING_HINTS = Map.of(KEY_ANTIALIASING, VALUE_ANTIALIAS_ON,
+			KEY_ALPHA_INTERPOLATION, VALUE_ALPHA_INTERPOLATION_QUALITY, KEY_COLOR_RENDERING, VALUE_COLOR_RENDER_QUALITY,
+			KEY_DITHERING, VALUE_DITHER_DISABLE, KEY_FRACTIONALMETRICS, VALUE_FRACTIONALMETRICS_ON, KEY_INTERPOLATION,
+			VALUE_INTERPOLATION_BICUBIC, KEY_RENDERING, VALUE_RENDER_QUALITY, KEY_STROKE_CONTROL, VALUE_STROKE_PURE,
+			KEY_TEXT_ANTIALIASING, VALUE_TEXT_ANTIALIAS_ON);
+
+	@Override
+	public BufferedImage rasterizeSVG(byte[] bytes, int zoom) throws IOException {
+		SVGLoader loader = new SVGLoader();
+		SVGDocument svgDocument = null;
+		if (this.isSVGFile(bytes)) {
+			try (InputStream stream = new ByteArrayInputStream(bytes)) {
+				svgDocument = loader.load(stream, null, LoaderContext.createDefault());
+			}
+			if (svgDocument != null) {
+				double scalingFactor = zoom / 100.0;
+				FloatSize size = svgDocument.size();
+				double originalWidth = size.getWidth();
+				double originalHeight = size.getHeight();
+				int scaledWidth = (int) Math.round(originalWidth * scalingFactor);
+				int scaledHeight = (int) Math.round(originalHeight * scalingFactor);
+				BufferedImage image = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_ARGB);
+				Graphics2D g = image.createGraphics();
+				g.setRenderingHints(RENDERING_HINTS);
+				g.scale(scalingFactor, scalingFactor);
+				svgDocument.render(null, g);
+				g.dispose();
+				return image;
+			}
+		}
+		return null;
+	}
+
+	private boolean isSVGFile(byte[] data) throws IOException {
+		String content = new String(data, 0, Math.min(data.length, 512), StandardCharsets.UTF_8);
+		return content.contains("<svg");
+	}
+
+	@Override
+	public boolean isSVGFile(InputStream inputStream) throws IOException {
+		if (inputStream == null) {
+			throw new IllegalArgumentException("InputStream cannot be null");
+		}
+		byte[] data = inputStream.readNBytes(512);
+		return isSVGFile(data);
+	}
+}

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ISVGRasterizer.java

@@ -0,0 +1,34 @@
+package org.eclipse.swt.graphics;
+
+import java.awt.image.*;
+import java.io.*;
+
+/**
+ * Defines the interface for an SVG rasterizer, responsible for converting
+ * SVG data into rasterized images.
+ *
+ * @since 3.129
+ */
+public interface ISVGRasterizer {
+
+	/**
+     * Rasterizes an SVG image from the provided byte array, using the specified zoom factor.
+     *
+     * @param bytes the SVG image as a byte array.
+     * @param zoom  the zoom factor.
+     * @return a {@link BufferedImage} containing the rasterized image, or {@code null} if the input
+     *         is not a valid SVG file or cannot be processed.
+     * @throws IOException if an error occurs while reading the SVG data.
+     */
+	public BufferedImage rasterizeSVG(byte[] bytes, int zoom) throws IOException;
+
+	/**
+     * Determines whether the given {@link InputStream} contains a SVG file.
+     *
+     * @param inputStream the input stream to check.
+     * @return {@code true} if the input stream contains SVG content; {@code false} otherwise.
+     * @throws IOException if an error occurs while reading the stream.
+     * @throws IllegalArgumentException if the input stream is {@code null}.
+     */
+	public boolean isSVGFile(InputStream inputStream) throws IOException;
+}

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageData.java

@@ -331,7 +331,14 @@ scanlinePad, checkData(data), 0, null,
  * @see ImageLoader#load(InputStream)
  */
 public ImageData(InputStream stream) {
-	ImageData[] data = ImageDataLoader.load(stream);
+	this(stream, 0);
+}
+
+/**
+ * @since 3.129
+ */
+public ImageData(InputStream stream, int zoom) {
+	ImageData[] data = ImageDataLoader.load(stream, zoom);
 	if (data.length < 1) SWT.error(SWT.ERROR_INVALID_IMAGE);
 	ImageData i = data[0];
 	setAllFields(
@@ -377,7 +384,14 @@ public ImageData(InputStream stream) {
  * </ul>
  */
 public ImageData(String filename) {
-	ImageData[] data = ImageDataLoader.load(filename);
+	this(filename, 0);
+}
+
+/**
+ * @since 3.129
+ */
+public ImageData(String filename, int zoom) {
+	ImageData[] data = ImageDataLoader.load(filename, zoom);
 	if (data.length < 1) SWT.error(SWT.ERROR_INVALID_IMAGE);
 	ImageData i = data[0];
 	setAllFields(

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/ImageDataLoader.java

@@ -25,8 +25,16 @@ public static ImageData[] load(InputStream stream) {
 		return new ImageLoader().load(stream);
 	}
 
-	public static ImageData[] load(String filename) {
+	public static ImageData[] load(InputStream stream, int zoom) {
+		return new ImageLoader().load(stream, zoom);
+	}
+
+		public static ImageData[] load(String filename) {
 		return new ImageLoader().load(filename);
 	}
 
+	public static ImageData[] load(String filename, int zoom) {
+		return new ImageLoader().load(filename, zoom);
+	}
+
 }

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/SVGRasterizerRegistry.java

@@ -0,0 +1,38 @@
+package org.eclipse.swt.graphics;
+
+/**
+ * A registry for managing the instance of an {@link ISVGRasterizer} implementation.
+ * This allows for the registration and retrieval of a single rasterizer instance.
+ *
+ * @since 3.129
+ */
+public class SVGRasterizerRegistry {
+
+	/**
+     * The instance of the registered {@link ISVGRasterizer}.
+     */
+	private static ISVGRasterizer rasterizer;
+
+	 /**
+     * Registers the provided implementation of {@link ISVGRasterizer}.
+     * If a rasterizer has already been registered, subsequent calls to this method
+     * will have no effect.
+     *
+     * @param implementation the {@link ISVGRasterizer} implementation to register.
+     */
+	public static void register(ISVGRasterizer implementation) {
+		if (rasterizer == null) {
+			rasterizer = implementation;
+		}
+	}
+
+	/**
+     * Retrieves the currently registered {@link ISVGRasterizer} implementation.
+     *
+     * @return the registered {@link ISVGRasterizer}, or {@code null} if no implementation
+     *         has been registered.
+     */
+	public static ISVGRasterizer getRasterizer() {
+		return rasterizer;
+	}
+}

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java

@@ -468,7 +468,7 @@ public Image(Device device, ImageData source, ImageData mask) {
 public Image (Device device, InputStream stream) {
 	super(device);
 	initialNativeZoom = DPIUtil.getNativeDeviceZoom();
-	ImageData data = DPIUtil.autoScaleUp(device, new ElementAtZoom<>(new ImageData (stream), 100));
+	ImageData data = DPIUtil.autoScaleUp(device, new ElementAtZoom<>(new ImageData (stream, getZoom()), 100));
 	init(data, getZoom());
 	init();
 	this.device.registerResourceWithZoomSupport(this);
@@ -510,7 +510,7 @@ public Image (Device device, String filename) {
 	super(device);
 	if (filename == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	initialNativeZoom = DPIUtil.getNativeDeviceZoom();
-	ImageData data = DPIUtil.autoScaleUp(device, new ElementAtZoom<>(new ImageData (filename), 100));
+	ImageData data = DPIUtil.autoScaleUp(device, new ElementAtZoom<>(new ImageData (filename, getZoom()), 100));
 	init(data, getZoom());
 	init();
 	this.device.registerResourceWithZoomSupport(this);
@@ -553,10 +553,10 @@ public Image(Device device, ImageFileNameProvider imageFileNameProvider) {
 	if (fileName.zoom() == getZoom()) {
 		ImageHandle imageMetadata = initNative (fileName.element(), getZoom());
 		if (imageMetadata == null) {
-			init(new ImageData (fileName.element()), getZoom());
+			init(new ImageData (fileName.element(), getZoom()), getZoom());
 		}
 	} else {
-		ImageData resizedData = DPIUtil.autoScaleImageData (device, new ImageData (fileName.element()), fileName.zoom());
+		ImageData resizedData = DPIUtil.autoScaleImageData (device, new ImageData (fileName.element(), getZoom()), fileName.zoom());
 		init(resizedData, getZoom());
 	}
 	init();
@@ -753,7 +753,7 @@ private ImageHandle getImageMetadata(int zoom) {
 
 	if (imageFileNameProvider != null) {
 		ElementAtZoom<String> imageCandidate = DPIUtil.validateAndGetImagePathAtZoom (imageFileNameProvider, zoom);
-		ImageData imageData = new ImageData (imageCandidate.element());
+		ImageData imageData = new ImageData (imageCandidate.element(), zoom);
 		if (imageCandidate.zoom() == zoom) {
 			/* Release current native resources */
 			ImageHandle imageMetadata = initNative(imageCandidate.element(), zoom);
@@ -1389,7 +1389,7 @@ public ImageData getImageData (int zoom) {
 		return DPIUtil.scaleImageData (device, data.element(), zoom, data.zoom());
 	} else if (imageFileNameProvider != null) {
 		ElementAtZoom<String> fileName = DPIUtil.validateAndGetImagePathAtZoom (imageFileNameProvider, zoom);
-		return DPIUtil.scaleImageData (device, new ImageData (fileName.element()), zoom, fileName.zoom());
+		return DPIUtil.scaleImageData (device, new ImageData (fileName.element(), zoom), zoom, fileName.zoom());
 	}
 
 	// if a GC is initialized with an Image (memGC != null), the image data must not be resized, because it would