SVGUtils: support creating window images from SVG files that are not …

…16x16 (issue #196)

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

@@ -30,46 +30,84 @@
 import com.kitfox.svg.SVGException;
 
 /**
+ * Utility methods for SVG.
+ *
  * @author Karl Tauber
  */
 public class SVGUtils
 {
 	/**
 	 * Creates from the given SVG a list of icon images with different sizes that
-	 * can be used for windows headers. The SVG should have a size of 16 x 16.
+	 * can be used for windows headers. The SVG should have a size of 16x16,
+	 * otherwise it is scaled.
 	 *
+	 * @param svgName the name of the SVG resource (a '/'-separated path)
+	 * @return list of icon images with different sizes (16x16, 24x24, 32x32, 48x48 and 64x64)
+	 * @throws RuntimeException if failed to load or render SVG file
 	 * @see JWindow#setIconImages(List)
 	 */
 	public static List<Image> createWindowIconImages( String svgName ) {
+		SVGDiagram diagram = loadSVG( svgName );
+
 		return Arrays.asList(
-			svg2image( svgName, 1f ),	// 16 x 16
-			svg2image( svgName, 1.5f ),	// 24 x 24
-			svg2image( svgName, 2f ),	// 32 x 32
-			svg2image( svgName, 3f ),	// 48 x 48
-			svg2image( svgName, 4f )		// 64 x 64
+			svg2image( diagram, 16, 16 ),
+			svg2image( diagram, 24, 24 ),
+			svg2image( diagram, 32, 32 ),
+			svg2image( diagram, 48, 48 ),
+			svg2image( diagram, 64, 64 )
 		);
 	}
 
 	/**
 	 * Creates a buffered image and renders the given SVG into it.
+	 *
+	 * @param svgName the name of the SVG resource (a '/'-separated path)
+	 * @param width the width of the image
+	 * @param height the height of the image
+	 * @return the image
+	 * @throws RuntimeException if failed to load or render SVG file
+	 */
+	public static BufferedImage svg2image( String svgName, int width, int height ) {
+		return svg2image( loadSVG( svgName ), width, height );
+	}
+
+	/**
+	 * Creates a buffered image and renders the given SVG into it.
+	 *
+	 * @param svgName the name of the SVG resource (a '/'-separated path)
+	 * @param scaleFactor the amount by which the SVG size is scaled
+	 * @return the image
+	 * @throws RuntimeException if failed to load or render SVG file
 	 */
 	public static BufferedImage svg2image( String svgName, float scaleFactor ) {
-		try {
-			URL url = SVGUtils.class.getResource( svgName );
-			SVGDiagram diagram = SVGCache.getSVGUniverse().getDiagram( url.toURI() );
+		SVGDiagram diagram = loadSVG( svgName );
+		int width = (int) (diagram.getWidth() * scaleFactor);
+		int height = (int) (diagram.getHeight() * scaleFactor);
+		return svg2image( diagram, width, height );
+	}
 
-			BufferedImage image = new BufferedImage(
-				(int) (diagram.getWidth() * scaleFactor),
-				(int) (diagram.getHeight() * scaleFactor),
-				BufferedImage.TYPE_INT_ARGB );
+	/**
+	 * Creates a buffered image and renders the given SVGDiagram into it.
+	 *
+	 * @param diagram the SVG diagram
+	 * @param width the width of the image
+	 * @param height the height of the image
+	 * @return the image
+	 * @throws RuntimeException if failed to render SVG file
+	 */
+	public static BufferedImage svg2image( SVGDiagram diagram, int width, int height ) {
+		try {
+			BufferedImage image = new BufferedImage( width, height, BufferedImage.TYPE_INT_ARGB );
 
 			Graphics2D g = image.createGraphics();
 			try {
 				g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
 				g.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR );
 
-				if( scaleFactor != 1f )
-					g.scale( scaleFactor, scaleFactor );
+				double sx = width / diagram.getWidth();
+				double sy = height / diagram.getHeight();
+				if( sx != 1 || sy != 1 )
+					g.scale( sx, sy );
 
 				diagram.setIgnoringClipHeuristic( true );
 
@@ -79,7 +117,23 @@ public static BufferedImage svg2image( String svgName, float scaleFactor ) {
 			}
 			return image;
 
-		} catch( URISyntaxException | SVGException ex ) {
+		} catch( SVGException ex ) {
+			throw new RuntimeException( ex );
+		}
+	}
+
+	/**
+	 * Loads a SVG file.
+	 *
+	 * @param svgName the name of the SVG resource (a '/'-separated path)
+	 * @return the SVG diagram
+	 * @throws RuntimeException if failed to load SVG file
+	 */
+	private static SVGDiagram loadSVG( String svgName ) {
+		try {
+			URL url = SVGUtils.class.getResource( svgName );
+			return SVGCache.getSVGUniverse().getDiagram( url.toURI() );
+		} catch( URISyntaxException ex ) {
 			throw new RuntimeException( ex );
 		}
 	}