Aaron-aid wrote ...

2022/4/13

java heap error

Aaron-aid

2022/4/13

halllp!!! whenever i run my game 2/3 times greenfoot crashes with this error ;c

java.lang.OutOfMemoryError: Java heap space
    at java.desktop/java.awt.image.DataBufferInt.<init>(DataBufferInt.java:75)
    at java.desktop/java.awt.image.Raster.createPackedRaster(Raster.java:467)
    at java.desktop/java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1032)
    at java.desktop/java.awt.GraphicsConfiguration.createCompatibleImage(GraphicsConfiguration.java:186)
    at greenfoot.util.GraphicsUtilities.createCompatibleTranslucentImage(GraphicsUtilities.java:186)
    at greenfoot.GreenfootImage.<init>(GreenfootImage.java:130)
    at GifImage.loadImages(GifImage.java:119)
    at GifImage.<init>(GifImage.java:40)
    at Player.<init>(Player.java:25)
    at punk.<init>(punk.java:12)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
    at greenfoot.core.Simulation.newInstance(Simulation.java:580)
    at greenfoot.platforms.ide.WorldHandlerDelegateIDE.lambda$instantiateNewWorld$0(WorldHandlerDelegateIDE.java:143)
    at greenfoot.platforms.ide.WorldHandlerDelegateIDE$$Lambda$85/0x000000080019a440.run(Unknown Source)
    at greenfoot.core.Simulation.runQueuedTasks(Simulation.java:470)
    at greenfoot.core.Simulation.maybePause(Simulation.java:299)
    at greenfoot.core.Simulation.runContent(Simulation.java:190)
    at greenfoot.core.Simulation.run(Simulation.java:183)

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import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.util.List;
import java.util.ArrayList;
/**
 * Write a description of class Player here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Player extends Actor
{
    static int timesDied= 0;
    static int check1 = 0;
    static boolean debug = false;
    static int playerending = 0;
    //playermovinghitbox checker
    public ArrayList<String> FaceStorage = new ArrayList<String>();
    boolean checklocation =false;
    int holder;
    boolean touched = true;
    //controlls
    boolean enterdown = false;
    static boolean playerWalking = false;
    GifImage LeftWalk = new GifImage("LeftWalk.gif");
    GifImage RightWalk = new GifImage("RightWalk.gif");
    String direction = "front";
    int defVal = 20;
    //player movement switches
    //movement
    boolean stat1 = false;
    //attack
    boolean stat2 = false;
    //punching
    fistHitbox punch = new fistHitbox();
    //front
    boolean frontpunch = false;
    boolean FtimerTF = false;
    int frontpunchtimer = defVal;
     
    //back
    boolean backpunch = false;
    boolean BtimerTF = false;
    int backpunchtimer = defVal;
    //left
    boolean leftpunch = false;
    boolean LtimerTF = false;
    int leftpunchtimer = defVal;
     
    //right
     
    boolean rightpunch = false;
    boolean RtimerTF = false;
    int rightpunchtimer = defVal;
    //health
    static int health = 10000;
    static int boosterhealth = 200;
    boolean runonce = false;
    static int currentlv = 1;
    boolean maingame = true;
    boolean playercanmove = false;
    //story stuff
    boolean justpunch = false;
    boolean firsts_and_Final_CHoice = false;
    boolean isdead = false;
    boolean run = false;
    /**
     * Act - do whatever the Player wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        if(maingame == true){
          otherstuff();
        }
        if(playercanmove == true)
        {
            playerReqCheck();
            stat1= true;
            stat2= true;
            if (run == false){
            playerMovement(stat1, stat2);
        }
        else{playerMovementRun(stat1, stat2);}
        }
        if(firsts_and_Final_CHoice == true)
        {
            playerPunch();
        }
         
    }  
    void otherstuff()
    {
        start();
        
        health();
        cleanup();
    }
    void cleanup()
    {
     
            //actors
        if(getWorld().getObjects(BossActor.class).size() != 0){
        if(getWorld().getObjects(BossActor.class).size() > 1)
        {
            getWorld().removeObject(getWorld().getObjects(BossActor.class).get(getWorld().getObjects(BossActor.class).size()-1));
        }
     
    }
       if(getWorld().getObjects(GoonActor.class).size() > 1)
        {
            getWorld().removeObject(getWorld().getObjects(GoonActor.class).get(getWorld().getObjects(GoonActor.class).size()-1));
            if(getWorld().getObjects(GoonActor.class).size() > 4){
            getWorld().removeObject(getWorld().getObjects(GoonActor.class).get(getWorld().getObjects(GoonActor.class).size()-2));
        }
        }
        //suit
        if(getWorld().getObjects(suit.class).size() > 1)
        {
            getWorld().removeObject(getWorld().getObjects(suit.class).get(getWorld().getObjects(suit.class).size()-1));
            if(getWorld().getObjects(GoonActor.class).size() > 4){
            getWorld().removeObject(getWorld().getObjects(suit.class).get(getWorld().getObjects(suit.class).size()-2));
        }
        }
        //npcs
        
         
     
     
         
    }
    void health()
    {
         
        if(isTouching(enemypunch.class)&&runonce == false)
        {
             
            health = health - 5;
            runonce = true;
        }else{runonce = false;}
        if(health<= 0)
        {
            health = 100;
            deathscreen x = new deathscreen();
            timesDied++;
             
            Greenfoot.setWorld(x);
        }
             
    }
     
    void start()
    {
        playerMovement(stat1,stat2);
        if(debug == true){
            gamestart(true);
        }else
        {
            stat1= true;
            stat2 = true;
        }
         
        playerReqCheck();
    }
    void gamestart(boolean start)
    {
        if(start == true)
        {
            gamestory();
        }
    }
    void gamestory()
    {
        //level one
        if(currentlv == 1){
        BossActor x = new BossActor();
        getWorld().addObject(x, 600, getY());
        if(getWorld().getObjects(BossActor.class).get(0).check1 == false && getWorld().getObjects(BossActor.class).get(0).runonce2 == false){
            x.runact = 1;
        }
         
    }
    if(currentlv == 2)
    {
        playerMovement(stat1,stat2);
        p_moveLeft(3);
        if(check1 == 1)
        {
            if(getWorld().getObjects(enemySpawner.class).size() > 0){
            getWorld().getObjects(enemySpawner.class).get(0).enemys = true;
            getWorld().getObjects(enemySpawner.class).get(1).enemys = true;
        }
        }
    }
    if(currentlv == 3)
    {
        stat1= true;
        stat2 = true;
        p_moveLeft(3);
        playerMovement(stat1,stat2);
    }
    if(currentlv == 5)
    {
        stat1= true;
        stat2 = true;
        p_moveLeft(3);
        playerMovement(stat1,stat2);
    }
    else
    {
        stat1= true;
        stat2 = true;
        p_moveLeft(3);
        playerMovement(stat1,stat2);
    }
    }
    void playerReqCheck()
    {
        //checks and spawns in all required items for the player to work
        if (getWorld().getObjects(playerfeet.class).size() == 0)
        {
            getWorld().addObject(new playerfeet(), 0, 0);
        }
        if (getWorld().getObjects(playerhitbox.class).size() == 0)
        {
            getWorld().addObject(new playerhitbox(), 0, 0);
        }
        if (getWorld().getObjects(healthbar.class).size() == 0)
        {
            getWorld().addObject(new healthbar(),547,13);
        }
    }
    void playerMovement(boolean movement,boolean fists)
    {
        if(movement == true){
        p_moveLeft(1);
       }
        if(fists == true){
        playerPunch();
       }
    }
    void playerMovementRun(boolean movement,boolean fists)
    {
        if(movement == true){
        p_moveLeft(2);
       }
        if(fists == true){
        playerPunch();
       }
    }
    void playerPunch()
    {
       FrontPunch();
       LeftPunch();
       RightPunch();
       BackPunch();
    }
    void FrontPunch(){
         
        if (FtimerTF == false)
        {
            frontpunchtimer--;
            if(frontpunchtimer <= 0)
            {
               getWorld().removeObject(punch);
               FtimerTF = true;
               frontpunchtimer = defVal;
            }
        }
        if(Greenfoot.isKeyDown("Enter"))
            {
                if ("front".equals(direction)&&frontpunch == false && FtimerTF == true )
                {
                 
                 
                getWorld().addObject(punch, getX(), getY()-40);
                frontpunch = true;
                FtimerTF = false;
               }
                
            }else{frontpunch = false;}
         
    }
     
    void BackPunch(){ 
        if (BtimerTF == false)
        {
            backpunchtimer--;
            if(backpunchtimer <= 0)
            {
               getWorld().removeObject(punch);
               BtimerTF = true;
               backpunchtimer = defVal;
            }
        }
        if(Greenfoot.isKeyDown("Enter"))
            {
                if ("back".equals(direction)&&backpunch == false && BtimerTF == true )
                {
                 
                 
                getWorld().addObject(punch, getX(), getY()+40);
                backpunch = true;
                BtimerTF = false;
               }
                
            }else{backpunch = false;}
         
    }
    void LeftPunch(){
        if (LtimerTF == false)
        {
            leftpunchtimer--;
            if(leftpunchtimer <= 0)
            {
               getWorld().removeObject(punch);
               LtimerTF = true;
               leftpunchtimer = defVal;
            }
        }
        if(Greenfoot.isKeyDown("Enter"))
            {
                if ("left".equals(direction)&&leftpunch == false && LtimerTF == true )
                {
                 
                 
                getWorld().addObject(punch, getX()-30, getY());
                leftpunch = true;
                LtimerTF = false;
               }
                
            }else{leftpunch = false;}
         
     
         
     
    }
    void RightPunch()
    {
        if (RtimerTF == false)
        {
            rightpunchtimer--;
            if(rightpunchtimer <= 0)
            {
               getWorld().removeObject(punch);
               RtimerTF = true;
               rightpunchtimer = defVal;
            }
        }
        if(Greenfoot.isKeyDown("Enter"))
            {
                if ("right".equals(direction)&&rightpunch == false && RtimerTF == true )
                {
                 
                 
                getWorld().addObject(punch, getX()+30, getY());
                rightpunch = true;
                RtimerTF = false;
               }
                
            }else{rightpunch = false;}
         
     
    }
    void p_moveLeft(int speed){
        if(getWorld().getObjects(playerfeet.class).size() >= 1){
        if(getWorld().getObjects(playerfeet.class).get(0).touchingWalkinglocation() == false&&FaceStorage.size()>=1)
        {
            //front
            if("front".equals(FaceStorage.get( FaceStorage.size()-1)))
                {
                    setLocation(getX(), getY()+10);
                     
                }
            if("front".equals(FaceStorage.get( FaceStorage.size()-2)))
                {
                    setLocation(getX(), getY()+10);
                     
                }
            //back
            if("back".equals(FaceStorage.get( FaceStorage.size()-1)))
                {
                    setLocation(getX(), getY()-10);
                     
                }
            if("back".equals(FaceStorage.get( FaceStorage.size()-2)))
                {
                    setLocation(getX(), getY()-10);
                     
                }     
            //left
            if("left".equals(FaceStorage.get( FaceStorage.size()-1)))
                {
                    setLocation(getX()+10, getY());
                     
                }
            if("left".equals(FaceStorage.get( FaceStorage.size()-2)))
                {
                    setLocation(getX()+10, getY());
                     
                } 
            //right
            if("right".equals(FaceStorage.get( FaceStorage.size()-1)))
                {
                    setLocation(getX()-10, getY());
                     
                }
            if("right".equals(FaceStorage.get( FaceStorage.size()-2)))
                {
                    setLocation(getX()-10, getY());
                     
                } 
             
             
        }
    }
        if(playerWalking == true)
        {
        if(getWorld().getObjects(playerfeet.class).size() >= 1&&FaceStorage.size()>=1){
         if(getWorld().getObjects(playerfeet.class).get(0).touchingWalkinglocation() ==false)
         {
              
        }
    }
    if(getWorld().getObjects(playerfeet.class).size() >= 1){
         if(getWorld().getObjects(playerfeet.class).get(0).touchingWalkinglocation() == true){
         if (Greenfoot.isKeyDown("D") == false && Greenfoot.isKeyDown("A") == false)
         {
             if ("front".equals(direction)){
             setImage("IdleBack.png");
             getImage().scale(100, 140);
              
            }
            if ("back".equals(direction)){
             setImage("idleFront.png");
             getImage().scale(80, 140);
            }
            if ("left".equals(direction)){
             setImage("idleL.png");
             getImage().scale(50, 140);
            }
            if ("right".equals(direction)){
             setImage("idleR.png");
             getImage().scale(50, 140);
            }
         }
         if(Greenfoot.isKeyDown("W"))
         {
             direction = "front";
             setLocation(getX(), getY()-speed);
             FaceStorage.add("front");
             //setImage(FrontWalk.getCurrentImage());
             //getImage().scale(250, 150);
          }
         if(Greenfoot.isKeyDown("D"))
         {
             direction = "right";
             FaceStorage.add("right");
             setLocation(getX()+speed, getY());
              
             setImage(RightWalk.getCurrentImage());
              
             getImage().scale(250, 150);
              
              
         }
         if(Greenfoot.isKeyDown("A"))
         {
             direction = "left";
             FaceStorage.add("left");
             touched = false;
             setLocation(getX()-speed, getY());
             setImage(LeftWalk.getCurrentImage());
             getImage().scale(250, 150);
         }
         if(Greenfoot.isKeyDown("S"))
         {
             direction = "back";
              
             FaceStorage.add("back");
             setLocation(getX(), getY()+speed);
             //setImage(FrontWalk.getCurrentImage());
             //getImage().scale(250, 150);
              
          }
        }
    }
    }
    }
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
 
/**
 * Write a description of class punk here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class punk extends World
{
     
    Player player = new Player();
     
    /**
     * Constructor for objects of class punk.
     * 
     */
    public punk()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
 
        prepare();
    }
 
    public void act()
    {
        
    }
     
    /**
     * Prepare the world for the start of the program.
     * That is: create the initial objects and add them to the world.
     */
    private void prepare()
    {
        player.maingame = false;
        player.playercanmove = true;
        player.playerWalking = true;
        Walkinglocation walkinglocation = new Walkinglocation();
        addObject(walkinglocation,298,197);
        walkinglocation.getImage().scale(1000, 1000);
        suit suit = new suit();
        addObject(suit,288,163);
        suit.storyPosition=1;
        walkinglocation.setLocation(286,358);
        Player player = new Player();
        addObject(player,286,358);
        walkinglocation.setLocation(283,315);
        walkinglocation.setLocation(284,399);
        nextscene nextscene = new nextscene();
        addObject(nextscene,284,399);
        nextscene.currentuse = 1;
    }
}

Aaron-aid

2022/4/13

heres the game (open source) https://www.greenfoot.org/scenarios/29135

Spock47

2022/4/14

Well, since it says it runs out of memory, I would guess that something is done inadequately often, thereby filling all available memory. As first step, you could check how often the line mentioned in the error stack is creating a new image, e.g. change GifImage, line 119 to

1	`GreenfootImage image = debugInitImage(decode.getFrame(i).getWidth(), decode.getFrame(i).getHeight());`

and add the following source code to the class:

private static int debugImageCount = 0;
 
private GreenfootImage debugInitImage(int width, int height) {
    ++debugImageCount;
    System.out.println("Count of new images: " + debugImageCount);
    return new GreenfootImage(width, height);
}

Check whether it prints out a very big count of images in the console. If so, you now know where to search for the problem. If the count is actually not very big, then you should check whether the error always shows the same stack (e.g. "at GifImage.loadImages(GifImage.java:119)") or whether the stack actually is different for different runs. Live long and prosper, Spock47

Aaron-aid

2022/4/14

awesome man, thx :D

Aaron-aid

2022/4/15

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import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
import java.util.ArrayList;
 
/**
 * This class can be used to read animated gif image files and extract the individual
 * images of the animation sequence.
 * 
 * @author Michael Berry
 * @author Neil Brown
 */
public class GifImage
{
    /** The images used in the animation. */
    private GreenfootImage[] images;
    /** The delay between each frame. */
    private int[] delay;
    /** The index of the current frame in the GIF file. */
    private int currentIndex;
    /** The time passed since the last frame in ms. */
    private long time;
    /** The GIF file that contains the animation. */
    private String file;
    /** Whether the animation is paused or not. */
    private boolean pause;
 
    /**
     * Set the image of the actor. If the image is a normal picture, it will be displayed as normal.
     * If it's an animated GIF file then it will be displayed as an animated actor.
     */
    public GifImage(String file)
    {
        this.file = file;
        pause = false;
        if(file.toLowerCase().endsWith(".gif")) {
            loadImages();
        }
        else {
            images = new GreenfootImage[] {new GreenfootImage(file)};
            delay = new int[] {1000}; // Doesn't matter, as long as it's not zero
            currentIndex = 0;
            time = System.currentTimeMillis();
        }
    }
 
    /**
     * Get all the images used in the animation
     * @return a list of GreenfootImages, corresponding to each frame.
     */
    public List<GreenfootImage> getImages()
    {
        ArrayList<GreenfootImage> images = new ArrayList<GreenfootImage>(this.images.length);
        for(GreenfootImage image : this.images) {
            images.add(image);
        }
        return images;
    }
 
    /**
     * Pause the animation.
     */
    public void pause()
    {
        pause = true;
    }
 
    /**
     * Resume the animation.
     */
    public void resume()
    {
        pause = false;
        time = System.currentTimeMillis();
    }
 
    /**
     * Determines whether the animation is running
     * @return true if the animation is running, false otherwise
     */
    public boolean isRunning()
    {
        return !pause;
    }
 
    public GreenfootImage getCurrentImage()
    {
        long delta = System.currentTimeMillis() - time;
 
        while (delta >= delay[currentIndex] && !pause) {
            delta -= delay[currentIndex];
            time += delay[currentIndex];
            currentIndex = (currentIndex+1) % images.length;
        }
        return images[currentIndex];
    }
 
    /**
     * Load the images
     */
    private void loadImages()
    {
        GifDecoder decode = new GifDecoder();
        decode.read(file);
        int numFrames = decode.getFrameCount();
        if(numFrames>0) {
            images = new GreenfootImage[numFrames];
            delay = new int[numFrames];
        }
        else {
            images = new GreenfootImage[1];
            images[0] = new GreenfootImage(1, 1);
        }
 
        for (int i=0 ; i<numFrames ; i++) {
            GreenfootImage image = new GreenfootImage(decode.getFrame(i).getWidth(), decode.getFrame(i).getHeight());
            image.drawImage(decode.getFrame(i), 0, 0);
            delay[i] = decode.getDelay(i);
            images[i] = image;
        }
        time = System.currentTimeMillis();
    }
 
    /**
     * The Rectangle class represents rectangles. This is essentially a re-implementation
     * of the java.awt.Rectangle class, created in order to avoid any dependency on AWT.
     */
    private static class Rectangle
    {
        public int x;
        public int y;
        public int width;
        public int height;
         
        public Rectangle(int x, int y, int width, int height)
        {
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
        }
    }
     
    /**
     * Class GifDecoder - Decodes a GIF file into one or more frames. <br><br>
     * 
     * <i>I (Michael) edited this slightly on 10/09/08 to bring class up to date with generics and therefore remove warnings.
     * Also edited so that resources are grabbed from the jar file and not externally, so no security exceptions.</i>
     * <br><br>
     * <pre>
     *  Example:
     *     GifDecoder d = new GifDecoder();
     *     d.read(&quot;sample.gif&quot;);
     *     int n = d.getFrameCount();
     *     for (int i = 0; i &lt; n; i++) {
     *        BufferedImage frame = d.getFrame(i);  // frame i
     *        int t = d.getDelay(i);  // display duration of frame in milliseconds
     *        // do something with frame
     *     }
     * </pre>
     * 
     * No copyright asserted on the source code of this class. May be used for any
     * purpose, however, refer to the Unisys LZW patent for any additional
     * restrictions. Please forward any corrections to kweiner@fmsware.com.
     * 
     * @author Kevin Weiner, FM Software; LZW decoder adapted from John Cristy's
     *         ImageMagick.
     * @version 1.03 November 2003
     * 
     */
    private class GifDecoder
    {
        /**
         * File read status: No errors.
         */
        public static final int STATUS_OK = 0;
 
        /**
         * File read status: Error decoding file (may be partially decoded)
         */
        public static final int STATUS_FORMAT_ERROR = 1;
 
        /**
         * File read status: Unable to open source.
         */
        public static final int STATUS_OPEN_ERROR = 2;
 
        private BufferedInputStream in;
 
        private int status;
 
        private int width; // full image width
 
        private int height; // full image height
 
        private boolean gctFlag; // global color table used
 
        private int gctSize; // size of global color table
 
        private int loopCount = 1; // iterations; 0 = repeat forever
 
        private int[] gct; // global color table
 
        private int[] lct; // local color table
 
        private int[] act; // active color table
 
        private int bgIndex; // background color index
 
        private Color bgColor; // background color
 
        private Color lastBgColor; // previous bg color
 
        private int pixelAspect; // pixel aspect ratio
 
        private boolean lctFlag; // local color table flag
 
        private boolean interlace; // interlace flag
 
        private int lctSize; // local color table size
 
        private int ix, iy, iw, ih; // current image rectangle
 
        private Rectangle lastRect; // last image rect
 
        private GreenfootImage image; // current frame
 
        private GreenfootImage lastImage; // previous frame
 
        private byte[] block = new byte[256]; // current data block
 
        private int blockSize = 0; // block size
 
        // last graphic control extension info
        private int dispose = 0;
 
        // 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
        private int lastDispose = 0;
 
        private boolean transparency = false; // use transparent color
 
        private int delay = 0; // delay in milliseconds
 
        private int transIndex; // transparent color index
 
        private static final int MaxStackSize = 4096;
 
        // max decoder pixel stack size
 
        // LZW decoder working arrays
        private short[] prefix;
 
        private byte[] suffix;
 
        private byte[] pixelStack;
 
        private byte[] pixels;
 
        private ArrayList<GifFrame> frames; // frames read from current file
 
        private int frameCount;
 
        /**
         * A single frame
         */
        private class GifFrame {
            public GifFrame(GreenfootImage im, int del) {
                image = im;
                delay = del;
            }
 
            private GreenfootImage image;
 
            private int delay;
        }
 
        /**
         * Convert an RGB integer value to a Color.
         */
        private Color colorFromInt(int rgb)
        {
            int r = (rgb & 0xFF0000) >> 16;
            int g = (rgb & 0xFF00) >> 8;
            int b = (rgb & 0xFF);
            return new Color(r,g,b);
        }
         
        /**
         * Gets display duration for specified frame.
         * 
         * @param n
         *          int index of frame
         * @return delay in milliseconds
         */
        public int getDelay(int n) {
            //
            delay = -1;
            if ((n >= 0) && (n < frameCount)) {
                delay = (frames.get(n)).delay;
            }
            return delay;
        }
 
        /**
         * Gets the number of frames read from file.
         * 
         * @return frame count
         */
        public int getFrameCount() {
            return frameCount;
        }
 
        /**
         * Gets the first (or only) image read.
         * 
         * @return BufferedImage containing first frame, or null if none.
         */
        public GreenfootImage getImage() {
            return getFrame(0);
        }
 
        /**
         * Gets the "Netscape" iteration count, if any. A count of 0 means repeat
         * indefinitiely.
         * 
         * @return iteration count if one was specified, else 1.
         */
        public int getLoopCount() {
            return loopCount;
        }
 
        /**
         * Creates new frame image from current data (and previous frames as specified
         * by their disposition codes).
         */
        protected void setPixels() {
            // fill in starting image contents based on last image's dispose code
            if (lastDispose > 0) {
                if (lastDispose == 3) {
                    // use image before last
                    int n = frameCount - 2;
                    if (n > 0) {
                        lastImage = getFrame(n - 1);
                    } else {
                        lastImage = null;
                    }
                }
 
                if (lastImage != null) {
                    image.clear();
                    image.drawImage(lastImage, 0, 0);
                     
                    // copy pixels
 
                    if (lastDispose == 2) {
                        // fill last image rect area with background color
                        Color c = null;
                        if (transparency) {
                            c = new Color(0, 0, 0, 0); // assume background is transparent
                        } else {
                            c = lastBgColor; // use given background color
                        }
                        image.setColor(c);
                        image.fillRect(lastRect.x, lastRect.y, lastRect.width, lastRect.height);
                    }
                }
            }
 
            // copy each source line to the appropriate place in the destination
            int pass = 1;
            int inc = 8;
            int iline = 0;
            for (int i = 0; i < ih; i++) {
                int line = i;
                if (interlace) {
                    if (iline >= ih) {
                        pass++;
                        switch (pass) {
                        case 2:
                            iline = 4;
                            break;
                        case 3:
                            iline = 2;
                            inc = 4;
                            break;
                        case 4:
                            iline = 1;
                            inc = 2;
                        }
                    }
                    line = iline;
                    iline += inc;
                }
                line += iy;
                if (line < height) {
                    int k = line * width;
                    int dlim = Math.min(ix + iw, width);
                    int sx = i * iw;
                     
                    for (int dx = ix; dx < dlim; dx++) {
                        int index = ((int) pixels[sx++]) & 0xff;
                        int c = act[index];
                        if (c != 0) {
                            image.setColorAt(dx, line, colorFromInt(c));
                        }
                    }
                }
            }
        }
 
        /**
         * Gets the image contents of frame n.
         * 
         * @return BufferedImage representation of frame, or null if n is invalid.
         */
        public GreenfootImage getFrame(int n) {
            GreenfootImage im = null;
            if ((n >= 0) && (n < frameCount)) {
                im = ((GifFrame) frames.get(n)).image;
            }
            return im;
        }
 
        /**
         * Gets image size.
         * 
         * @return GIF image dimensions as an array - [0] = width, [1] = height
         */
        public int[] getFrameSize() {
            return new int[]{width, height};
        }
 
        /**
         * Reads GIF image from stream
         * 
         * @param BufferedInputStream
         *          containing GIF file.
         * @return read status code (0 = no errors)
         */
        public int read(BufferedInputStream is) {
            init();
            if (is != null) {
                in = is;
                readHeader();
                if (!err()) {
                    readContents();
                    if (frameCount < 0) {
                        status = STATUS_FORMAT_ERROR;
                    }
                }
            } else {
                status = STATUS_OPEN_ERROR;
            }
            try {
                is.close();
            } catch (IOException e) {
            }
            return status;
        }
 
        /**
         * Reads GIF image from stream
         * 
         * @param InputStream
         *          containing GIF file.
         * @return read status code (0 = no errors)
         */
        public int read(InputStream is) {
            init();
            if (is != null) {
                if (!(is instanceof BufferedInputStream))
                    is = new BufferedInputStream(is);
                in = (BufferedInputStream) is;
                readHeader();
                if (!err()) {
                    readContents();
                    if (frameCount < 0) {
                        status = STATUS_FORMAT_ERROR;
                    }
                }
            } else {
                status = STATUS_OPEN_ERROR;
            }
            try {
                is.close();
            } catch (IOException e) {
            }
            return status;
        }
 
        /**
         * Reads GIF file from specified file/URL source (URL assumed if name contains
         * ":/" or "file:")
         * 
         * @param name
         *          String containing source
         * @return read status code (0 = no errors)
         */
        public int read(String name) {
            status = STATUS_OK;
            try {
                URL url = this.getClass().getClassLoader().getResource(name);
                if (url == null) {
                    name = "images/" + name;
                    url = this.getClass().getClassLoader().getResource(name);
                    if (url == null) {
                        throw new RuntimeException("The gif file \"" + name + "\" doesn't exist.");
                    }
                }
                in = new BufferedInputStream(url.openStream());
                status = read(in);
            } catch (IOException e) {
                status = STATUS_OPEN_ERROR;
            }
 
            return status;
        }
 
        /**
         * Decodes LZW image data into pixel array. Adapted from John Cristy's
         * ImageMagick.
         */
        protected void decodeImageData() {
            int NullCode = -1;
            int npix = iw * ih;
            int available, clear, code_mask, code_size, end_of_information, in_code, old_code, bits, code, count, i, datum, data_size, first, top, bi, pi;
 
            if ((pixels == null) || (pixels.length < npix)) {
                pixels = new byte[npix]; // allocate new pixel array
            }
            if (prefix == null)
                prefix = new short[MaxStackSize];
            if (suffix == null)
                suffix = new byte[MaxStackSize];
            if (pixelStack == null)
                pixelStack = new byte[MaxStackSize + 1];
 
            // Initialize GIF data stream decoder.
 
            data_size = read();
            clear = 1 << data_size;
            end_of_information = clear + 1;
            available = clear + 2;
            old_code = NullCode;
            code_size = data_size + 1;
            code_mask = (1 << code_size) - 1;
            for (code = 0; code < clear; code++) {
                prefix[code] = 0;
                suffix[code] = (byte) code;
            }
 
            // Decode GIF pixel stream.
 
            datum = bits = count = first = top = pi = bi = 0;
 
            for (i = 0; i < npix;) {
                if (top == 0) {
                    if (bits < code_size) {
                        // Load bytes until there are enough bits for a code.
                        if (count == 0) {
                            // Read a new data block.
                            count = readBlock();
                            if (count <= 0)
                                break;
                            bi = 0;
                        }
                        datum += (((int) block[bi]) & 0xff) << bits;
                        bits += 8;
                        bi++;
                        count--;
                        continue;
                    }
 
                    // Get the next code.
 
                    code = datum & code_mask;
                    datum >>= code_size;
                        bits -= code_size;
 
                        // Interpret the code
 
                        if ((code > available) || (code == end_of_information))
                            break;
                        if (code == clear) {
                            // Reset decoder.
                            code_size = data_size + 1;
                            code_mask = (1 << code_size) - 1;
                            available = clear + 2;
                            old_code = NullCode;
                            continue;
                        }
                        if (old_code == NullCode) {
                            pixelStack[top++] = suffix[code];
                            old_code = code;
                            first = code;
                            continue;
                        }
                        in_code = code;
                        if (code == available) {
                            pixelStack[top++] = (byte) first;
                            code = old_code;
                        }
                        while (code > clear) {
                            pixelStack[top++] = suffix[code];
                            code = prefix[code];
                        }
                        first = ((int) suffix[code]) & 0xff;
 
                        // Add a new string to the string table,
 
                        if (available >= MaxStackSize)
                            break;
                        pixelStack[top++] = (byte) first;
                        prefix[available] = (short) old_code;
                        suffix[available] = (byte) first;
                        available++;
                        if (((available & code_mask) == 0) && (available < MaxStackSize)) {
                            code_size++;
                            code_mask += available;
                        }
                        old_code = in_code;
                }
 
                // Pop a pixel off the pixel stack.
 
                top--;
                pixels[pi++] = pixelStack[top];
                i++;
            }
 
            for (i = pi; i < npix; i++) {
                pixels[i] = 0; // clear missing pixels
            }
 
        }
 
        /**
         * Returns true if an error was encountered during reading/decoding
         */
        protected boolean err() {
            return status != STATUS_OK;
        }
 
        /**
         * Initializes or re-initializes reader
         */
        protected void init() {
            status = STATUS_OK;
            frameCount = 0;
            frames = new ArrayList<GifFrame>();
            gct = null;
            lct = null;
        }
 
        /**
         * Reads a single byte from the input stream.
         */
        protected int read() {
            int curByte = 0;
            try {
                curByte = in.read();
            } catch (IOException e) {
                status = STATUS_FORMAT_ERROR;
            }
            return curByte;
        }
 
        /**
         * Reads next variable length block from input.
         * 
         * @return number of bytes stored in "buffer"
         */
        protected int readBlock() {
            blockSize = read();
            int n = 0;
            if (blockSize > 0) {
                try {
                    int count = 0;
                    while (n < blockSize) {
                        count = in.read(block, n, blockSize - n);
                        if (count == -1)
                            break;
                        n += count;
                    }
                } catch (IOException e) {
                }
 
                if (n < blockSize) {
                    status = STATUS_FORMAT_ERROR;
                }
            }
            return n;
        }
 
        /**
         * Reads color table as 256 RGB integer values
         * 
         * @param ncolors
         *          int number of colors to read
         * @return int array containing 256 colors (packed ARGB with full alpha)
         */
        protected int[] readColorTable(int ncolors) {
            int nbytes = 3 * ncolors;
            int[] tab = null;
            byte[] c = new byte[nbytes];
            int n = 0;
            try {
                n = in.read(c);
            } catch (IOException e) {
            }
            if (n < nbytes) {
                status = STATUS_FORMAT_ERROR;
            } else {
                tab = new int[256]; // max size to avoid bounds checks
                int i = 0;
                int j = 0;
                while (i < ncolors) {
                    int r = ((int) c[j++]) & 0xff;
                    int g = ((int) c[j++]) & 0xff;
                    int b = ((int) c[j++]) & 0xff;
                    tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b;
                }
            }
            return tab;
        }
 
        /**
         * Main file parser. Reads GIF content blocks.
         */
        protected void readContents() {
            // read GIF file content blocks
            boolean done = false;
            while (!(done || err())) {
                int code = read();
                switch (code) {
 
                case 0x2C: // image separator
                    readImage();
                    break;
 
                case 0x21: // extension
                    code = read();
                    switch (code) {
                    case 0xf9: // graphics control extension
                        readGraphicControlExt();
                        break;
 
                    case 0xff: // application extension
                        readBlock();
                        String app = "";
                        for (int i = 0; i < 11; i++) {
                            app += (char) block[i];
                        }
                        if (app.equals("NETSCAPE2.0")) {
                            readNetscapeExt();
                        } else
                            skip(); // don't care
                        break;
 
                    default: // uninteresting extension
                        skip();
                    }
                    break;
 
                case 0x3b: // terminator
                    done = true;
                    break;
 
                case 0x00: // bad byte, but keep going and see what happens
                    break;
 
                default:
                    status = STATUS_FORMAT_ERROR;
                }
            }
        }
 
        /**
         * Reads Graphics Control Extension values
         */
        protected void readGraphicControlExt() {
            read(); // block size
            int packed = read(); // packed fields
            dispose = (packed & 0x1c) >> 2; // disposal method
            if (dispose == 0) {
                dispose = 1; // elect to keep old image if discretionary
            }
            transparency = (packed & 1) != 0;
            delay = readShort() * 10; // delay in milliseconds
            transIndex = read(); // transparent color index
            read(); // block terminator
        }
 
        /**
         * Reads GIF file header information.
         */
        protected void readHeader() {
            String id = "";
            for (int i = 0; i < 6; i++) {
                id += (char) read();
            }
            if (!id.startsWith("GIF")) {
                status = STATUS_FORMAT_ERROR;
                return;
            }
 
            readLSD();
            if (gctFlag && !err()) {
                gct = readColorTable(gctSize);
                bgColor = colorFromInt(gct[bgIndex]);
            }
        }
 
        /**
         * Reads next frame image
         */
        protected void readImage() {
            ix = readShort(); // (sub)image position & size
            iy = readShort();
            iw = readShort();
            ih = readShort();
 
            int packed = read();
            lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
            interlace = (packed & 0x40) != 0; // 2 - interlace flag
            // 3 - sort flag
            // 4-5 - reserved
            lctSize = 2 << (packed & 7); // 6-8 - local color table size
 
            if (lctFlag) {
                lct = readColorTable(lctSize); // read table
                act = lct; // make local table active
            } else {
                act = gct; // make global table active
                if (bgIndex == transIndex)
                    bgColor = colorFromInt(0);
            }
            int save = 0;
            if (transparency) {
                save = act[transIndex];
                act[transIndex] = 0; // set transparent color if specified
            }
 
            if (act == null) {
                status = STATUS_FORMAT_ERROR; // no color table defined
            }
 
            if (err())
                return;
 
            decodeImageData(); // decode pixel data
            skip();
 
            if (err())
                return;
 
            frameCount++;
 
            // create new image to receive frame data
            image = new GreenfootImage(width, height);
 
            setPixels(); // transfer pixel data to image
 
            frames.add(new GifFrame(image, delay)); // add image to frame list
 
            if (transparency) {
                act[transIndex] = save;
            }
            resetFrame();
 
        }
 
        /**
         * Reads Logical Screen Descriptor
         */
        protected void readLSD() {
 
            // logical screen size
            width = readShort();
            height = readShort();
 
            // packed fields
            int packed = read();
            gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
            // 2-4 : color resolution
            // 5 : gct sort flag
            gctSize = 2 << (packed & 7); // 6-8 : gct size
 
            bgIndex = read(); // background color index
            pixelAspect = read(); // pixel aspect ratio
        }
 
        /**
         * Reads Netscape extenstion to obtain iteration count
         */
        protected void readNetscapeExt() {
            do {
                readBlock();
                if (block[0] == 1) {
                    // loop count sub-block
                    int b1 = ((int) block[1]) & 0xff;
                    int b2 = ((int) block[2]) & 0xff;
                    loopCount = (b2 << 8) | b1;
                }
            } while ((blockSize > 0) && !err());
        }
 
        /**
         * Reads next 16-bit value, LSB first
         */
        protected int readShort() {
            // read 16-bit value, LSB first
            return read() | (read() << 8);
        }
 
        /**
         * Resets frame state for reading next image.
         */
        protected void resetFrame() {
            lastDispose = dispose;
            lastRect = new Rectangle(ix, iy, iw, ih);
            lastImage = image;
            lastBgColor = bgColor;
            int dispose = 0;
            boolean transparency = false;
            int delay = 0;
            lct = null;
        }
 
        /**
         * Skips variable length blocks up to and including next zero length block.
         */
        protected void skip() {
            do {
                readBlock();
            } while ((blockSize > 0) && !err());
        }
    }
 
}

Spock47

2022/4/16

What results did the test show? Do you still have questions open? (Your last post seems to be only the source code of the GifImage class, but not containing any question.)

RcCookie

2022/4/19

Another thing to always do with images (and gifs even more, even more memory expensive) is to only load them once and store them in a static variable. That way you can use as often as you want, but only ever load a single instance

Aaron-aid

2022/4/20

RcCookie wrote...

this would help a ton, the only yhing is i dont know how to do that, could u show me?

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