Update highgui+HighGui.java

toBufferedImage
Modifying the original array copying method here can double the speed.

modules/highgui/misc/java/src/java/highgui+HighGui.java

@@ -62,14 +62,9 @@ public final class HighGui {
         if (m.channels() > 1) {
             type = BufferedImage.TYPE_3BYTE_BGR;
         }
-
-        int bufferSize = m.channels() * m.cols() * m.rows();
-        byte[] b = new byte[bufferSize];
-        m.get(0, 0, b); // get all the pixels
         BufferedImage image = new BufferedImage(m.cols(), m.rows(), type);
-
         final byte[] targetPixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
-        System.arraycopy(b, 0, targetPixels, 0, b.length);
+        m.get(0, 0, targetPixels);
 
         return image;
     }