Slick PNGDecoder错误 - java.lang.UnsupportedOperationException：此图像的格式不受支持 [英] Slick PNGDecoder Error - java.lang.UnsupportedOperationException: Unsupported format for this image
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问题描述
我正在使用Slick库在Java中创建一个简单的小Galaga克隆。不幸的是，我遇到了一个问题，我收到了这个错误，然后是游戏结束：
I'm making a simple little Galaga clone in Java with the Slick library. Unfortunately, I've run into an issue in which I get this error, followed by the game closing:
Mon May 12 08:54:32 EDT 2014 WARN:class org.newdawn.slick.opengl.PNGImageData failed to
read the data
java.lang.UnsupportedOperationException: Unsupported format for this image
at org.newdawn.slick.opengl.PNGDecoder.decode(PNGDecoder.java:272)
at org.newdawn.slick.opengl.PNGImageData.loadImage(PNGImageData.java:97)
at org.newdawn.slick.opengl.CompositeImageData.loadImage(CompositeImageData.
java:62)
at org.newdawn.slick.opengl.CompositeImageData.loadImage(CompositeImageData.
java:43)
at org.newdawn.slick.opengl.InternalTextureLoader.getTexture(InternalTextureLoader.
java:292)
at org.newdawn.slick.opengl.InternalTextureLoader.getTexture(InternalTextureLoader.
java:254)
at org.newdawn.slick.opengl.InternalTextureLoader.getTexture(InternalTextureLoader.
java:187)
at org.newdawn.slick.Image.<init>(Image.java:192)
at org.newdawn.slick.Image.<init>(Image.java:166)
at org.newdawn.slick.Image.<init>(Image.java:154)
at org.newdawn.slick.Image.<init>(Image.java:132)
at com.othinolis.danmaku.Play.init(Play.java:21)
at com.othinolis.danmaku.Game.initStatesList(Game.java:20)
at org.newdawn.slick.state.StateBasedGame.init(StateBasedGame.java:164)
at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:393)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:317)
at com.othinolis.danmaku.Game.main(Game.java:29)
Mon May 12 08:54:35 EDT 2014 ERROR:null
java.lang.NullPointerException
at com.othinolis.danmaku.Play.render(Play.java:32)
at org.newdawn.slick.state.StateBasedGame.render(StateBasedGame.java:199)
at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:688)
at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
at com.othinolis.danmaku.Game.main(Game.java:29)
Mon May 12 08:54:35 EDT 2014 ERROR:Game.render() failure - check the game code.
org.newdawn.slick.SlickException: Game.render() failure - check the game code.
at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:691)
at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
at com.othinolis.danmaku.Game.main(Game.java:29)
在我首次加载PNG时尝试将状态从主菜单移动到游戏中时会发生这种情况。我所有的资源都是PNG。这是我的其他类文件：
This happens after I attempt to move states from the main menu and into the game proper, when PNGs are first loaded. All of my resources are PNGs. Here's my other class files:
Game.java：
Game.java:
package com.othinolis.danmaku;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
public class Game extends StateBasedGame{
public static final String gamename = "Danmaku Courage";
public static final int menu = 0;
public static final int play = 1;
public Game(String gamename){
super(gamename);
this.addState(new Menu(menu));
this.addState(new Play(play));
}
public void initStatesList(GameContainer gc) throws SlickException{
this.getState(menu).init(gc, this);
this.getState(play).init(gc, this);
this.enterState(menu);
}
public static void main(String[] args) {
AppGameContainer appgc;
try{
appgc = new AppGameContainer(new Game(gamename));
appgc.setDisplayMode(600, 600, false);
appgc.start();
}catch(SlickException e){
e.printStackTrace();
}
}
}
菜单。 java（状态0，运行没有问题）：
Menu.java (state 0, runs with no issues):
package com.othinolis.danmaku;
import org.lwjgl.input.Mouse;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
public class Menu extends BasicGameState{
Image playNow;
Image exitGame;
public Menu(int state){
}
public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{
playNow = new Image("res/playButton.png");
exitGame = new Image("res/exitGame.png");
}
public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException{
g.drawString("Danmaku Courage", 230, 50);
g.drawString("mousex: " + Mouse.getX() + " mousey: " + Mouse.getY(), 300, 400);
playNow.draw(200,100);
exitGame.draw(200,200);
}
public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException{
int posX = Mouse.getX();
int posY = Mouse.getY();
//play now button
if((posX>237 && posX<364)&&(posY>425 && posY<460)){
if(Mouse.isButtonDown(0)){
sbg.enterState(1);
}
}
//exit game
if((posX>254 && posX<335)&&(posY>338 && posY<361)){
if(Mouse.isButtonDown(0)){
System.exit(0);
}
}
}
public int getID(){
return 0;
}
}
和Play.java（在菜单和播放之间移动是问题发生的地方。与屏幕一侧碰撞的数字以及你可能不准确的数字。）：
and Play.java (moving between Menu and Play is where the issue hits. The numbers for collisions with the side of the screen and what have you may not be exact.):
package com.othinolis.danmaku;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
public class Play extends BasicGameState{
Animation player, movingLeft, movingRight; //2 animations, player will be set to one
Image worldMap;
boolean quit = false;
int[] duration = {200,200}; //length of the frame
float playerPositionX = 0; //player will start at coordinates 0,0
float playerPositionY = 0;
float shiftX = buckyPositionX + 320; //this will shift the screen so bucky appears in middle
float shiftY = buckyPositionY + 160; //half the length and half the width of the screen
public Play(int state){
}
public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{
worldMap = new Image("res/background.png");
Image[] walkLeft = {new Image("res/player.png"), new Image("res/player.png")};
Image[] walkRight = {new Image("res/player.png"), new Image("res/player.png")};
movingLeft = new Animation(walkLeft, duration, false);
movingRight = new Animation(walkRight, duration, false);
player = movingDown; //by default as soon as game loads, player will be facing down
}
public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException{
worldMap.draw(buckyPositionX,buckyPositionY); //draw the map at 0,0 to start
player.draw(shiftX,shiftY); //draw player at 320, 160 (center of the screen)
g.drawString("player's X: "+playerPositionX+"\nplayer's Y: "+playerPositionY, 400, 20); //indicator to see where player is
//when they press escape
if(quit==true){
g.drawString("Resume (R)", 250, 100);
g.drawString("Main Menu (M)", 250, 150);
g.drawString("Quit Game (Q)", 250, 200);
if(quit==false){
g.clear();
}
}
}
public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException{
Input input = gc.getInput();
if(input.isKeyDown(Input.KEY_LEFT)){
player = movingLeft;
playerPositionX += delta * .1f;
if(playerPositionX>324){
playerPositionX -= delta * .1f;
}
}
if(input.isKeyDown(Input.KEY_RIGHT)){
player = movingRight;
playerPositionX -= delta * .1f;
if(playerPositionX<-840){
playerPositionX += delta * .1f;
}
}
//escape
if(input.isKeyDown(Input.KEY_ESCAPE)){
quit = true;
}
//when they hit escape
if(quit==true){
if(input.isKeyDown(Input.KEY_R)){
quit = false;
}
if(input.isKeyDown(Input.KEY_M)){
sbg.enterState(0);
try{
Thread.sleep(250);
}catch(InterruptedException e){
e.printStackTrace();
}
}
if(input.isKeyDown(Input.KEY_Q)){
System.exit(0);
}
}
}
public int getID(){
return 1;
}
}
我所知道的光滑来自几个论坛帖子我已经读过像这样的问题，（当然没有一个问题确实存在问题，也没有解决方案）和Bucky的Slick教程此处。如果你想下载项目以便你可以导入它，看看你是否可以帮助我，我把它扔到Dropbox上这里。
What I know of slick has come from the several Forum posts I've read about issues like this one, (none of them had the exact issue nor the solution, of course) and Bucky's Slick tutorials that are here. If you'd like to download the project so you can import it and see if you can help me, I've thrown it onto Dropbox here.
推荐答案
对于任何人来说这都是太多的代码或调试。但是关于实际问题：AFAIK，Slick PNG加载器只支持非常少的PNG文件类型（在阅读它们时以某种方式与性能相关，但这可能是一个神话......）。应该可以加载图像，如
That's way too much code for anyone to read or debug. But regarding the actual problem: AFAIK, the Slick PNG loader only supports very few PNG file types (somehow related to performance when reading them, but that may be a myth...). It should be possible to load the image with something like
// "Image" here refers to a Slick Image, and NOT to java.awt.Image!
private static Image loadImage(String path) throws IOException
{
BufferedImage bufferedImage = ImageIO.read(new File(path));
Texture texture = BufferedImageUtil.getTexture("", bufferedImage);
Image image = new Img(texture.getImageWidth(), texture.getImageHeight());
image.setTexture(texture);
return image;
}
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