Merge pull request #1054 from Ali-RS/export-transparent-png

Modified JmeDesktopSystem.writeImageFile() to export transparency for…

jme3-desktop/src/main/java/com/jme3/system/JmeDesktopSystem.java

@@ -90,19 +90,21 @@ public class JmeDesktopSystem extends JmeSystemDelegate {
     
     @Override
     public void writeImageFile(OutputStream outStream, String format, ByteBuffer imageData, int width, int height) throws IOException {
-        BufferedImage awtImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
-        Screenshots.convertScreenShot2(imageData.asIntBuffer(), awtImage);
-
         ImageWriter writer = ImageIO.getImageWritersByFormatName(format).next();
         ImageWriteParam writeParam = writer.getDefaultWriteParam();
         
+        BufferedImage awtImage;
         if (format.equals("jpg")) {
             JPEGImageWriteParam jpegParam = (JPEGImageWriteParam) writeParam;
             jpegParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
             jpegParam.setCompressionQuality(0.95f);
-        }
+            awtImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
-
+            Screenshots.convertScreenShot2(imageData.asIntBuffer(), awtImage);
             awtImage = verticalFlip(awtImage);
+        } else {
+            awtImage = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
+            Screenshots.convertScreenShot(imageData, awtImage);
+        }
 
         ImageOutputStream imgOut = new MemoryCacheImageOutputStream(outStream);
         writer.setOutput(imgOut);