Added a simple example

src/Hqx2xUpscalerExample.java

@@ -0,0 +1,52 @@
+
+import java.awt.image.*;
+import java.io.*;
+import javax.imageio.*;
+import hqx.*;
+
+class Hqx2xUpscalerExample {
+    public static void main(String[] args) {
+
+		// Load an image
+		BufferedImage bi = null;
+		try {
+			bi = ImageIO.read(new File("sampleImage_original.png"));
+		}
+		catch (java.io.IOException e) {
+			System.err.println("Error loading image file: " + e);
+		}
+		if (bi != null) {
+			// Convert image to ARGB if on another format
+			if (bi.getType() != BufferedImage.TYPE_INT_ARGB && bi.getType() != BufferedImage.TYPE_INT_ARGB_PRE) {
+				final BufferedImage temp = new BufferedImage(bi.getWidth(), bi.getHeight(), BufferedImage.TYPE_INT_ARGB);
+				temp.getGraphics().drawImage(bi, 0, 0, null);
+				bi = temp;
+			}
+			// Obtain pixel data for source image
+			final int[] data = ((DataBufferInt) bi.getRaster().getDataBuffer()).getData();
+
+			// Initialize lookup tables
+			RgbYuv.hqxInit();
+
+			// Create the destination image, twice as large for 2x algorithm
+			final BufferedImage biDest2 = new BufferedImage(bi.getWidth() * 2, bi.getHeight() * 2, BufferedImage.TYPE_INT_ARGB);
+			// Obtain pixel data for destination image
+			final int[] dataDest2 = ((DataBufferInt) biDest2.getRaster().getDataBuffer()).getData();
+			// Resize it
+			Hqx_2x.hq2x_32_rb(data, dataDest2, bi.getWidth(), bi.getHeight());
+			// Save our result
+			try {
+				ImageIO.write(biDest2, "PNG", new File("sampleImage_hqx2.png"));
+			}
+			catch(java.io.IOException e) {
+				System.err.println("Error loading image file: " + e);
+			}
+
+			// More calls to hq[234]x_32_rb() methods
+			// ....
+
+			// Release the lookup table
+			RgbYuv.hqxDeinit();
+		}
+	}
+}