Trouble finding Images once packaged ImageIO.read

dharshanar · January 24, 2015, 8:02pm

Hi All
I have been using
image = ImageIO.read(new File(“assets/Textures/alphamap.jpg”));
to load a bufferedImage

i use the image get the rgb value of a co-ordinate, to place vegetation on my terrain.
int pixel = image.getRGB(x, y); int alpha = (pixel >> 24) & 0xff; int red = (pixel >> 16) & 0xff; int green = (pixel >> 8) & 0xff; int blue = (pixel) & 0xff;

This works great when I’m running the game through JME SDK but when i package the game into a jar and try to run it, it cant find the image
javax.imageio.IIOException: Can’t read input file! at javax.imageio.ImageIO.read(ImageIO.java:1301) at com.jme3.lostVictories.SimpleGrassControl.setSpatial(SimpleGrassControl.java:154)

I can see the image included in assets.jar and
assetManager.loadModel(“Models/Vehicles/armored_car2.j3o”); and
imageBuilder.filename(
both seem to work.

Is there some way i can get ImageIO.read to find the right file path from the jar? or is there a easier way for me to load the image and the RGB of a pixel?

david_bernard_31 · January 24, 2015, 8:28pm

you should not use ImageIO.read to read files else you have this issue.
The suggested way is to load image via assetManager.
try something like :

tex = assetManager.loadTexture("Textures/alphamap.jpg");
image = text.getImage(); // not a BufferedImage like provided by ImageIO

If you prefer to use ImageIO, then you can create an AssetLoader that use it to create image,…

javadoc is your friend ! : AssetManager

dharshanar · January 24, 2015, 9:38pm

ok I did think of this, but i cant figure out how get RGB values out of a jme com.jme3.texture.Image

I can see it has getData(int index) would getData(0) give me the RGB values?

david_bernard_31 · January 24, 2015, 9:53pm

Yes but the encoding depends of Image.Format. check if it’s RGBA8, …

Edit you can see how we reorder color in com/jme3x/jfx/util/FormatUtils :

github.com

empirephoenix/JME3-JFX/blob/master/src/main/java/com/jme3x/jfx/util/FormatUtils.java

package com.jme3x.jfx.util;

import java.nio.ByteBuffer;

public class FormatUtils {

	//TODO benchmark
	public static Void reorder_ARGB82ABGR8(ByteBuffer data){
		int limit = data.limit() - 3;
		byte v;
		for (int i = 0; i < limit; i += 4) {
			v = data.get(i+1);
			data.put(i + 1, data.get(i+3) );
			data.put(i + 3, v );
		}
		return null;
	}

	//TODO benchmark
	public static Void reorder_RGBA82BGRA8(ByteBuffer data){

This file has been truncated. show original

nehon · January 24, 2015, 10:13pm

There is an ImageRaster class that can help you to read data from a JME Image.