FlatSVGIcon:

- use SVGDiagram directly instead of using SVGIcon
- check cliping bounds before painting
- paint red box on errors

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatSVGIcon.java

@@ -16,10 +16,13 @@
 
 package com.formdev.flatlaf.extras;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Image;
+import java.awt.Rectangle;
+import java.awt.RenderingHints;
 import java.awt.image.BufferedImage;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -29,7 +32,9 @@ import javax.swing.UIManager;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 import com.formdev.flatlaf.util.UIScale;
-import com.kitfox.svg.app.beans.SVGIcon;
+import com.kitfox.svg.SVGDiagram;
+import com.kitfox.svg.SVGException;
+import com.kitfox.svg.SVGUniverse;
 
 /**
  * @author Karl Tauber
@@ -37,19 +42,19 @@ import com.kitfox.svg.app.beans.SVGIcon;
 public class FlatSVGIcon
 	extends ImageIcon
 {
+	// use own SVG universe so that it can not be cleared from anywhere
+	private static final SVGUniverse svgUniverse = new SVGUniverse();
+
 	private final String name;
-	private final SVGIcon svgIcon;
+	private SVGDiagram diagram;
 	private boolean dark;
 
 	public FlatSVGIcon( String name ) {
 		this.name = name;
-
-		svgIcon = new SVGIcon();
-		svgIcon.setAntiAlias( true );
 	}
 
 	private void update() {
-		if( dark == isDarkLaf() && svgIcon.getSvgURI() != null )
+		if( dark == isDarkLaf() && diagram != null )
 			return;
 
 		dark = isDarkLaf();
@@ -57,8 +62,9 @@ public class FlatSVGIcon
 		if( url == null & dark )
 			url = getIconURL( name, false );
 
+		// load/get image
 		try {
-			svgIcon.setSvgURI( url.toURI() );
+			diagram = svgUniverse.getDiagram( url.toURI() );
 		} catch( URISyntaxException ex ) {
 			ex.printStackTrace();
 		}
@@ -75,32 +81,59 @@ public class FlatSVGIcon
 	@Override
 	public int getIconWidth() {
 		update();
-		return UIScale.scale( svgIcon.getIconWidth() );
+		return (int) UIScale.scale( (diagram != null) ? diagram.getWidth() : 16 );
 	}
 
 	@Override
 	public int getIconHeight() {
 		update();
-		return UIScale.scale( svgIcon.getIconHeight() );
+		return (int) UIScale.scale( (diagram != null) ? diagram.getHeight() : 16 );
 	}
 
 	@Override
 	public void paintIcon( Component c, Graphics g, int x, int y ) {
 		update();
 
+		Rectangle clipBounds = g.getClipBounds();
+		if( clipBounds != null && !clipBounds.intersects( new Rectangle( x, y, getIconWidth(), getIconHeight() ) ) )
+			return;
+
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
+			g2.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR );
 
-			g2.translate( x, y );
+			paintSvg( g2, x, y );
-			UIScale.scaleGraphics( g2 );
-
-			svgIcon.paintIcon( c, g2, 0, 0 );
 		} finally {
 			g2.dispose();
 		}
 	}
 
+	private void paintSvg( Graphics2D g, int x, int y ) {
+		if( diagram == null ) {
+			paintSvgError( g, x, y );
+			return;
+		}
+
+		g.translate( x, y );
+		g.clipRect( 0, 0, getIconWidth(), getIconHeight() );
+
+		UIScale.scaleGraphics( g );
+
+		diagram.setIgnoringClipHeuristic( true );
+
+		try {
+			diagram.render( g );
+		} catch( SVGException ex ) {
+			paintSvgError( g, 0, 0 );
+		}
+	}
+
+	private void paintSvgError( Graphics2D g, int x, int y ) {
+		g.setColor( Color.red );
+		g.fillRect( x, y, getIconWidth(), getIconHeight() );
+	}
+
 	@Override
 	public Image getImage() {
 		update();