Re: [JAVA2D] draw on TiledImage as one unified image, still managing memory

[java2d]

I´ve followed Roman´s directions (thanks Roman!) and I´ve coded something that 
(seems to) partially solves my problem. 

I am not sure if it´s correct (it seems to be, based on a few png´s I´ve 
generated), but I still have to test the performance using my application, that 
generates much more than two small red squares :-)

Here goes the code. Please check my comments.

Simone, thanks. What would you suggest me to change in my code?

thanks in advance

public class HugeDiskImage {

        public static void main(String[] args) {
                try {
                        int h = 20000;
                        int w = 2000;
                        /*
                         * for w == 20000
                         * Exception in thread "main" 
java.lang.IllegalArgumentException: Negative size
                                at sun.nio.ch.FileChannelImpl.map(Unknown 
Source)
                                at YourSuggestion.main(YourSuggestion.java:27)
                                
                                why?
                         */
                        try{
                                BufferedImage bim = new 
BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
                        }catch(java.lang.OutOfMemoryError error){
                                System.out.println("as expected....");
                        }
                        
                        File file = new File("c:\\swap.mem");
                // Create a read-write memory-mapped file
                FileChannel rwChannel = new RandomAccessFile(file, 
"rw").getChannel();
                ByteBuffer wrBuf = 
rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, 
6*w*h/*(int)rwChannel.size()*/); //negative size exception is raised here
                IntBuffer iBuf = wrBuf.asIntBuffer();
                
                //custom data buffer
                DataBufferSubClass db = new 
DataBufferSubClass(DataBuffer.TYPE_INT,3*h*w); //2 GB
                db.setWrBuf(iBuf);
                
                ColorModel cm = new DirectColorModel(24, 0x00ff0000, 
0x0000ff00, 0x000000ff);
                        SampleModel sm = cm.createCompatibleSampleModel(w,h);
                        WritableRaster wr = new MyWritableRaster(sm, db, new 
Point(0,0));
                        BufferedImage bim = new BufferedImage(cm, wr, true, 
null);
                        /*
                         * the commented code does not work because of open bug 
                         * 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6353518
                         * 
                         * probably related to
                         * 
http://archives.java.sun.com/cgi-bin/wa?A2=ind0403&L=java2d-interest&P=5337
                         * 
                ColorModel colorModel = new DirectColorModel(24, 0x00ff0000, 
0x0000ff00, 0x000000ff);
                int[] masks= {0x00ff0000, 0x0000ff00, 0x000000ff};
                WritableRaster raster = Raster.createPackedRaster(db,
                        w,
                        h,
                        3, masks, null);
                
                BufferedImage image =
                    new BufferedImage(colorModel, raster, false, null);
                */
                Graphics2D g2d = bim.createGraphics();
                g2d.setColor(Color.BLUE);
                g2d.fillRect(0, 0, bim.getWidth(), bim.getHeight());
                g2d.setColor(Color.RED);
                g2d.fillRect(0, 0, 10, 10);
                g2d.fillRect(bim.getWidth()-10, bim.getHeight()-10, 10, 10);
                
                ImageIO.write(bim, "png", new File("C:\\image.png"));
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        
}

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

import java.nio.IntBuffer;

public class DataBufferSubClass extends DataBuffer {

        private IntBuffer wrBuf;
        
        public void setWrBuf(IntBuffer wrBuf) {
                this.wrBuf = wrBuf;
        }

        public DataBufferSubClass(int dataType, int size) {
                super(dataType, size);
                // TODO Auto-generated constructor stub
        }

        public DataBufferSubClass(int dataType, int size, int numBanks) {
                super(dataType, size, numBanks);
                // TODO Auto-generated constructor stub
        }

        public DataBufferSubClass(int dataType, int size, int numBanks, int 
offset) {
                super(dataType, size, numBanks, offset);
                // TODO Auto-generated constructor stub
        }

        public DataBufferSubClass(int dataType, int size, int numBanks,
                        int[] offsets) {
                super(dataType, size, numBanks, offsets);
                // TODO Auto-generated constructor stub
        }

        @Override
        public int getElem(int bank, int i) {
                // TODO Auto-generated method stub
                return wrBuf.get(i);
        }

        @Override
        public void setElem(int bank, int i, int val) {
                // TODO Auto-generated method stub
                wrBuf.put(i, val);
        }

}

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

import java.awt.Point;
import java.awt.image.DataBuffer;
import java.awt.image.SampleModel;
import java.awt.image.WritableRaster;


public class MyWritableRaster extends WritableRaster{
        public MyWritableRaster(SampleModel sampleModel, DataBuffer dataBuffer, 
Point origin)
        {
                super(sampleModel, dataBuffer, origin);
        }
}
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