Overlap two images, ordinary java works, and not in BlackBerry JDE 5

I have an application for swing of simple java that takes two images and overlaps the other. While trying to this port in JDE5, I got out there is no class BufferedImage in the api of BB, but a similar class of the Bitmap. It's brought to BB mixing function is unable to produce an image that overlap. It shows a blank white screen.

Here's the plain java function

public BufferedImage blend( BufferedImage bi1, BufferedImage bi2,            double weight )   {     if (bi1 == null)          throw new NullPointerException("bi1 is null");

      if (bi2 == null)          throw new NullPointerException("bi2 is null");

      int width = bi1.getWidth();       if (width != bi2.getWidth())          throw new IllegalArgumentException("widths not equal");

     int height = bi1.getHeight();     if (height != bi2.getHeight())

          throw new IllegalArgumentException("heights not equal");

        BufferedImage bi3 = new BufferedImage(width, height,              BufferedImage.TYPE_INT_RGB);      int[] rgbim1 = new int[width];        int[] rgbim2 = new int[width];        int[] rgbim3 = new int[width];

      for (int row = 0; row < height; row++)     {         bi1.getRGB(0, row, width, 1, rgbim1, 0, width);           bi2.getRGB(0, row, width, 1, rgbim2, 0, width);

         for (int col = 0; col < width; col++)          {             int rgb1 = rgbim1[col];               int r1 = (rgb1 >> 16) & 255;                int g1 = (rgb1 >> 8) & 255;             int b1 = rgb1 & 255;

                int rgb2 = rgbim2[col];               int r2 = (rgb2 >> 16) & 255;                int g2 = (rgb2 >> 8) & 255;             int b2 = rgb2 & 255;

                int r3 = (int) (r1 * weight + r2 * (1.0 - weight));               int g3 = (int) (g1 * weight + g2 * (1.0 - weight));               int b3 = (int) (b1 * weight + b2 * (1.0 - weight));               rgbim3[col] = (r3 << 16) | (g3 << 8) | b3;            }

           bi3.setRGB(0, row, width, 1, rgbim3, 0, width);       }

       return bi3;   } 

Here's the java function of BB

  public Bitmap blend( Bitmap bi1, Bitmap  bi2,                      double weight )        {

              if (bi1 == null)                       throw new NullPointerException("bi1 is null");

                if (bi2 == null)                       throw new NullPointerException("bi2 is null");

                int width = bi1.getWidth();            if (width != bi2.getWidth())                   throw new IllegalArgumentException("widths not equal");

               int height = bi1.getHeight();          if (height != bi2.getHeight())

                        throw new IllegalArgumentException("heights not equal");

         Bitmap bi3 = new Bitmap(width, height);         int[] rgbim1 = new int[width];         int[] rgbim2 = new int[width];         int[] rgbim3 = new int[width];

                for (int row = 0; row < height; row++)         {

                       bi1.getARGB(rgbim1,0,width,0,row, width,1);                       bi2.getARGB(rgbim2,0,width,0,row, width,1); 

                       for (int col = 0; col < width; col++)                  {                              int rgb1 = rgbim1[col];                                int r1 = (rgb1 >> 16) & 255;                           int g1 = (rgb1 >> 8) & 255;                            int b1 = rgb1 & 255;

                          int rgb2 = rgbim2[col];                                int r2 = (rgb2 >> 16) & 255;                           int g2 = (rgb2 >> 8) & 255;                            int b2 = rgb2 & 255;

                          int r3 = (int) (r1 * weight + r2 * (1.0 - weight));                            int g3 = (int) (g1 * weight + g2 * (1.0 - weight));                            int b3 = (int) (b1 * weight + b2 * (1.0 - weight));                            rgbim3[col] = (r3 << 16) | (g3 << 8) | b3;                     }

                     bi3.setARGB(rgbim3, 0, width, 0,  row,width, 1);

                }

             return bi3;    }

The weight of the arg is a value from 1 to 100.

For reference, the full plain java source

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

package imagetest;

/** * * @author COMPUTER */// Blender1.java

import java.awt.*;import java.awt.image.*;

import javax.swing.*;import javax.swing.event.*;

/** * This class describes and contains the entry point to an application that * demonstrates the blending transition. */

public class Blender1 extends JFrame{  /**    *     */   private static final long serialVersionUID = 1L;

    /**    * Construct Blender1 GUI.     */

 public Blender1() {     super("Blender #1");      setDefaultCloseOperation(EXIT_ON_CLOSE);

        // Load first image from JAR file and draw image into a buffered image.

     ImageIcon ii1 = new ImageIcon(getClass().getResource("x.png"));       final BufferedImage bi1;      bi1 = new BufferedImage(ii1.getIconWidth(), ii1.getIconHeight(),              BufferedImage.TYPE_INT_RGB);      Graphics2D g2d = bi1.createGraphics();        int h = ii1.getImage().getHeight(null);       System.out.println("Blender1.Blender1()--------> height :" + h);       g2d.drawImage(ii1.getImage(), 0, 0, null);        g2d.dispose();

      // Load second image from JAR file and draw image into a buffered image.

        ImageIcon ii2 = new ImageIcon(getClass().getResource("y.png"));       final BufferedImage bi2;      bi2 = new BufferedImage(ii2.getIconWidth(), ii2.getIconHeight(),              BufferedImage.TYPE_INT_RGB);      g2d = bi2.createGraphics();       int h2 = ii2.getImage().getHeight(null);      System.out.println("Blender1.Blender1()--------> height :" + h2);      g2d.drawImage(ii2.getImage(), 0, 0, null);        g2d.dispose();

      // Create an image panel capable of displaying entire image. The widths       // of both images and the heights of both images must be identical.

     final ImagePanel ip = new ImagePanel();       ip.setPreferredSize(new Dimension(ii1.getIconWidth(), ii1             .getIconHeight()));       getContentPane().add(ip, BorderLayout.NORTH);

       // Create a slider for selecting the blending percentage: 100% means      // show all of first image; 0% means show all of second image.

      final JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 100);      slider.setMinorTickSpacing(5);        slider.setMajorTickSpacing(10);       slider.setPaintTicks(true);       slider.setPaintLabels(true);      slider.setLabelTable(slider.createStandardLabels(10));        slider.setInverted(true);     ChangeListener cl;        cl = new ChangeListener()     {         public void stateChanged( ChangeEvent e )         {             // Each time the user adjusts the slider, obtain the new              // blend percentage value and use it to blend the images.

               int value = slider.getValue();                ip.setImage(blend(bi1, bi2, value / 100.0));          }     };        slider.addChangeListener(cl);     getContentPane().add(slider, BorderLayout.SOUTH);

       // Display the first image, which corresponds to a 100% blend     // percentage.

      ip.setImage(bi1);

       pack();       setVisible(true); }

   /**    * Blend the contents of two BufferedImages according to a specified weight.   *     * @param bi1  *            first BufferedImage  * @param bi2  *            second BufferedImage     * @param weight   *            the fractional percentage of the first image to keep     *     * @return new BufferedImage containing blended contents of BufferedImage  *         arguments   */

 public BufferedImage blend( BufferedImage bi1, BufferedImage bi2,         double weight )   {     if (bi1 == null)          throw new NullPointerException("bi1 is null");

      if (bi2 == null)          throw new NullPointerException("bi2 is null");

      int width = bi1.getWidth();       if (width != bi2.getWidth())          throw new IllegalArgumentException("widths not equal");

     int height = bi1.getHeight();     if (height != bi2.getHeight())

          throw new IllegalArgumentException("heights not equal");

        BufferedImage bi3 = new BufferedImage(width, height,              BufferedImage.TYPE_INT_RGB);      int[] rgbim1 = new int[width];        int[] rgbim2 = new int[width];        int[] rgbim3 = new int[width];

      for (int row = 0; row < height; row++)     {         bi1.getRGB(0, row, width, 1, rgbim1, 0, width);           bi2.getRGB(0, row, width, 1, rgbim2, 0, width);

         for (int col = 0; col < width; col++)          {             int rgb1 = rgbim1[col];               int r1 = (rgb1 >> 16) & 255;                int g1 = (rgb1 >> 8) & 255;             int b1 = rgb1 & 255;

                int rgb2 = rgbim2[col];               int r2 = (rgb2 >> 16) & 255;                int g2 = (rgb2 >> 8) & 255;             int b2 = rgb2 & 255;

                int r3 = (int) (r1 * weight + r2 * (1.0 - weight));               int g3 = (int) (g1 * weight + g2 * (1.0 - weight));               int b3 = (int) (b1 * weight + b2 * (1.0 - weight));               rgbim3[col] = (r3 << 16) | (g3 << 8) | b3;            }

           bi3.setRGB(0, row, width, 1, rgbim3, 0, width);       }

       return bi3;   }

   /**    * Application entry point.    *     * @param args     *            array of command-line arguments  */

 public static void main( String[] args )  {     Runnable r = new Runnable()       {         public void run()         {             // Create Blender1's GUI on the event-dispatching             // thread.

              new Blender1();           }     };        EventQueue.invokeLater(r);    }}

/** * This class describes a panel that displays a BufferedImage's contents. */

class ImagePanel extends JPanel{ /**    *     */   private static final long serialVersionUID = 4977990666209629996L;    private BufferedImage bi;

   /**    * Specify and paint a new BufferedImage.  *     * @param bi   *            BufferedImage whose contents are to be painted   */

 void setImage( BufferedImage bi ) {     this.bi = bi;     repaint();    }

   /**    * Paint the image panel.  *     * @param g    *            graphics context used to paint the contents of the current   *            BufferedImage    */

 public void paintComponent( Graphics g )  {     if (bi != null)       {         Graphics2D g2d = (Graphics2D) g;          g2d.drawImage(bi, null, 0, 0);        } }}

Full java BB source

/* * ImageScreen.java * * © ,  * Confidential and proprietary. */

package src;

/** *  */

import java.io.OutputStream;import javax.microedition.io.Connector;import javax.microedition.io.file.FileConnection;import net.rim.device.api.system.Bitmap;import net.rim.device.api.ui.Field;import net.rim.device.api.ui.FieldChangeListener;import net.rim.device.api.ui.UiApplication;import net.rim.device.api.ui.component.BitmapField;import net.rim.device.api.ui.component.ButtonField;import net.rim.device.api.ui.component.Dialog;import net.rim.device.api.ui.component.LabelField;import net.rim.device.api.ui.container.HorizontalFieldManager;import net.rim.device.api.ui.container.MainScreen;import net.rim.device.api.ui.component.GaugeField;/** * The main screen to display an image taken from the camera demo. */public final class ImageScreen extends MainScreen{    /** The down-scaling ratio applied to the snapshot Bitmap */    private static final int IMAGE_SCALING = 7;

    /** The base file name used to store pictures */    private static final String FILE_NAME = System.getProperty("fileconn.dir.photos") + "IMAGE";

    /** The extension of the pictures to be saved */    private static final String EXTENSION = ".bmp";

    /** A counter for the number of snapshots taken */    private static int _counter;    Bitmap image1,image2; BitmapField imageField;     /** A reference to the current screen for listeners */    private ImageScreen _imageScreen;

   /**    * Constructor    * @param raw A byte array representing an image    */    public ImageScreen( final byte[] raw1,final byte[] raw2 )    {        // A reference to this object, to be used in listeners        _imageScreen = this;

        setTitle("Blend and Save");

        // Convert the byte array to a Bitmap image        image1 = Bitmap.createBitmapFromBytes( raw1, 0, -1, 1 );        image2 = Bitmap.createBitmapFromBytes( raw2, 0, -1, 1 );        // Create two field managers to center the screen's contents        HorizontalFieldManager hfm1 = new HorizontalFieldManager( Field.FIELD_HCENTER );        HorizontalFieldManager hfm2 = new HorizontalFieldManager( Field.FIELD_HCENTER );        HorizontalFieldManager hfm3 = new HorizontalFieldManager( Field.FIELD_HCENTER );        // Create the field that contains the image//blend(image1, image2, 50/ 100.0)        imageField = new BitmapField(blend(image1, image2, 50/ 100.0) ){

           public int getPreferredWidth(){ return 250;}           public int getPreferredHeight(){ return 150;}

         };

        hfm1.add( imageField ); 

        GaugeField scroller = new GaugeField("Adjust (alt + < >)",0,100,50,Field.EDITABLE | Field.FOCUSABLE);        //scroller.setBackground( net.rim.device.api.ui.decor.BackgroundFactory.createSolidBackground(0x00000000));          scroller.setChangeListener( new GaugeFieldListener() );         hfm2.add(scroller);         // Create the SAVE button which returns the user to the main camera        // screen and saves the picture as a file.        ButtonField photoButton = new ButtonField( "Save" );        photoButton.setChangeListener( new SaveListener(raw1,raw2) );        hfm3.add(photoButton);

        // Create the CANCEL button which returns the user to the main camera        // screen without saving the picture.        ButtonField cancelButton = new ButtonField( "Cancel" );        cancelButton.setChangeListener( new CancelListener() );        hfm3.add(cancelButton);

        // Add the field managers to the screen        add( hfm1 );        add( hfm2 );        add( hfm3 );scroller.setFocus();//scroller.setValue(50);    }    public Bitmap blend( Bitmap bi1, Bitmap  bi2,                      double weight )        {

              if (bi1 == null)                       throw new NullPointerException("bi1 is null");

                if (bi2 == null)                       throw new NullPointerException("bi2 is null");

                int width = bi1.getWidth();            if (width != bi2.getWidth())                   throw new IllegalArgumentException("widths not equal");

               int height = bi1.getHeight();          if (height != bi2.getHeight())

                        throw new IllegalArgumentException("heights not equal");

         Bitmap bi3 = new Bitmap(width, height);         int[] rgbim1 = new int[width];         int[] rgbim2 = new int[width];         int[] rgbim3 = new int[width];

                for (int row = 0; row < height; row++)         {            // bi -> int startX, int startY, int w, int h, int[] rgbArray, int offset, int scansize) 

             // bit - > int[] argbData, int offset, int scanLength, int x, int y, int width, int height) 

                       bi1.getARGB(rgbim1,0,width,0,row, width,1);//  row, width, 1, , 0, width);                       bi2.getARGB(rgbim2,0,width,0,row, width,1); 

                       //bi1.getRGB(0, row, width, 1, rgbim1, 0, width);                       //bi2.getRGB(0, row, width, 1, rgbim2, 0, width);

                       for (int col = 0; col < width; col++)                  {                              int rgb1 = rgbim1[col];                                int r1 = (rgb1 >> 16) & 255;                           int g1 = (rgb1 >> 8) & 255;                            int b1 = rgb1 & 255;

                          int rgb2 = rgbim2[col];                                int r2 = (rgb2 >> 16) & 255;                           int g2 = (rgb2 >> 8) & 255;                            int b2 = rgb2 & 255;

                          int r3 = (int) (r1 * weight + r2 * (1.0 - weight));                            int g3 = (int) (g1 * weight + g2 * (1.0 - weight));                            int b3 = (int) (b1 * weight + b2 * (1.0 - weight));                            rgbim3[col] = (r3 << 16) | (g3 << 8) | b3;                     }                    //bi -> int startX, int startY, int w, int h, int[] rgbArray, int offset, int scansize)                     //bit -> (int[] data, int offset, int scanLength, int left, int top, int width, int height)                      bi3.setARGB(rgbim3, 0, width, 0,  row,width, 1);

                    // bi3.setRGB(0, row, width, 1, rgbim3, 0, width);                }

             return bi3;    }

   /**    * Handles trackball click events    * @see net.rim.device.api.ui.Screen#invokeAction(int)    */       protected boolean invokeAction(int action)    {        boolean handled = super.invokeAction(action); 

        if(!handled)        {            switch(action)            {                case ACTION_INVOKE: // Trackball click.                {                                 return true;                }            }        }                return handled;              }

 /**    * A listener used for the "Save" button    */    private class GaugeFieldListener implements FieldChangeListener    {        public void fieldChanged(Field field, int context)        {          int value =  ((GaugeField)field).getValue(); if (value==0){return;}          imageField.setBitmap( blend(image1, image2, value/ 100.0) );          ((GaugeField)field).setLabel("Adjust (alt + < >)"+value);        }    }   /**    * A listener used for the "Save" button    */    private class SaveListener implements FieldChangeListener    {        /** A byte array representing an image */        private byte[] _raw1,_raw2;

       /**        * Constructor.        * @param raw A byte array representing an image        */        SaveListener(byte[] raw1,byte[] raw2)        {            _raw1 = raw1;            _raw2 = raw2;        }

       /**        * Saves the image as a file in the BlackBerry filesystem        */        public void fieldChanged(Field field, int context)        {            try            {                       // Create the connection to a file that may or                // may not exist.                FileConnection file = (FileConnection)Connector.open( FILE_NAME + _counter + EXTENSION );

                // If the file exists, increment the counter until we find                // one that hasn't been created yet.                while( file.exists() )                {                    file.close();                    ++_counter;                    file = (FileConnection)Connector.open( FILE_NAME + _counter + EXTENSION );                }

                // We know the file doesn't exist yet, so create it                file.create();

                // Write the image to the file                OutputStream out = file.openOutputStream();                out.write(_raw1);

                // Close the connections                out.close();                file.close();            }            catch(Exception e)            {                Dialog.alert( "ERROR " + e.getClass() + ":  " + e.getMessage() );            }

            // Inform the user where the file has been saved            Dialog.inform( "Saved to " + FILE_NAME + _counter + EXTENSION );

            // Increment the image counter            ++_counter;

            // Return to the main camera screen            UiApplication.getUiApplication().popScreen( _imageScreen );        }    }

   /**    * A listener used for the "Cancel" button    */    private class CancelListener implements FieldChangeListener    {       /**        * Return to the main camera screen        */        public void fieldChanged(Field field, int context)        {            UiApplication.getUiApplication().popScreen( _imageScreen );        }    }}

for (int col = 0; col < width; col++){int rgb1 = rgbim1[col];int r1 = (rgb1 >> 16) & 255;int g1 = (rgb1 >> 8) & 255;int b1 = rgb1 & 255;

int rgb2 = rgbim2[col];int r2 = (rgb2 >> 16) & 255;int g2 = (rgb2 >> 8) & 255;int b2 = rgb2 & 255;

int r3 = (int) (r1 * weight + r2 * (1.0 - weight));int g3 = (int) (g1 * weight + g2 * (1.0 - weight));int b3 = (int) (b1 * weight + b2 * (1.0 - weight));rgbim3[col] = (r3 << 16) | (g3 << 8) | b3;}

for (int col = 0; col < width; col++)
{
int rgb1 = rgbim1[col];
int a1 = (rgb1 >> 24) & 255;
int r1 = (rgb1 >> 16) & 255;
int g1 = (rgb1 >> 8) & 255;
int b1 = rgb1 & 255;

int rgb2 = rgbim2[col];
int a2 = (rgb2 >> 24) & 255;
int r2 = (rgb2 >> 16) & 255;
int g2 = (rgb2 >> 8) & 255;
int b2 = rgb2 & 255;

int a3 = (int) (a1 * weight + a2 * (1.0 - weight));
int r3 = (int) (r1 * weight + r2 * (1.0 - weight));
int g3 = (int) (g1 * weight + g2 * (1.0 - weight));
int b3 = (int) (b1 * weight + b2 * (1.0 - weight));
rgbim3[col] = (a3 << 24) | (r3 << 16) | (g3 << 8) | b3;
}