#15 adding a basic VImage creation for an image with 8-bit RGB color

Author: shroffk

epics-vtype/vtype/src/test/java/org/epics/vtype/VImageTest.java

@@ -0,0 +1,64 @@
+package org.epics.vtype;
+
+import static org.junit.Assert.assertEquals;
+
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferByte;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+import org.epics.util.array.ArrayByte;
+import org.epics.util.array.ListNumber;
+import org.junit.Test;
+
+public class VImageTest {
+
+    /**
+     * A test for the creation of a {@link VImage} data structure using an example image
+     */
+    @Test
+    public void of() {
+        BufferedImage img = null;
+        VImage vImage = null;
+        boolean done = false;
+        try {
+            img = ImageIO.read(VType.class.getResource("Tulips.jpg"));
+            vImage = VImage.of(img.getHeight(), img.getWidth(),
+                    ArrayByte.of(((DataBufferByte) img.getRaster().getDataBuffer()).getData()), VImageDataType.pvByte,
+                    Alarm.none(), Time.now());
+            BufferedImage vImg = toImage(vImage);
+            for (int x = 0; x < vImage.getWidth(); x++) {
+                for (int y = 0; y < vImage.getHeight(); y++) {
+                    assertEquals(img.getRGB(x, y), vImg.getRGB(x, y));
+                }
+            }
+            done = true;
+        } catch (IOException e) {
+        } finally {
+            if (!done) {
+                BufferedImage bf = toImage(vImage);
+                try {
+                    ImageIO.write(bf, "png", new File("src/test/resources/org/diirt/vtype/Tuplips-failed.jpg"));
+                } catch (IOException e) {
+                }
+            }
+        }
+    }
+
+    private static BufferedImage toImage(VImage vImage) {
+        if (vImage.getVImageType() == VImageType.TYPE_3BYTE_BGR) {
+            BufferedImage image = new BufferedImage(vImage.getWidth(), vImage.getHeight(),
+                    BufferedImage.TYPE_3BYTE_BGR);
+            ListNumber data = vImage.getData();
+            for (int i = 0; i < data.size(); i++) {
+                ((DataBufferByte) image.getRaster().getDataBuffer()).getData()[i] = data.getByte(i);
+            }
+            return image;
+        } else {
+            throw new UnsupportedOperationException(
+                    "No support for creating a BufferedImage from Image Type: " + vImage.getVImageType());
+        }
+    }
+}