Hi, I just started using this library, and it seems pretty neat. However, I'm having a problem:
public Bitmap getChunk(int x, int y, int w, int h) {
IL.ilBindImage(ilHandle);
//Construct a new bitmap
Bitmap bmp = new Bitmap(w,h);
//copy the pixel data
IL.ilCopyPixels(x,y,0,w,h,1,IL.IL_RGBA,IL.IL_UNSIGNED_BYTE,bmp.imageData);
//load it into the copy's image
IL.ilBindImage(bmp.ilHandle);
IL.ilLoadL(IL.IL_RGBA, bmp.imageData);
//try to save it, in a futile attempt at debugging
if(!IL.ilSaveImage("./test" + bmp.ilHandle + ".png")) {
System.out.println("Error: " + IL.ilGetError());
}
//win
return bmp;
}
A bit of explanation: My Bitmap class keeps both the DevIL handle and a copy of the image data (both of which are allocated in the constructor). This method is part of the Bitmap class, allowing one to extract a sub-bitmap (say, a sprite from a sprite sheet).
I've confirmed that when I call this method, the Bitmap has a valid image in DevIL. I can save the original to a file just fine. And, I painstakingly checked the bmp.imageData buffer, and that is being written. But, when I copy it to the new image (just after ilCopyPixels), it doesn't load. And, when I save it (for debugging purposes), it's just a blank white pixel.
Oh, here's the constructor, if it's important:
public Bitmap(int w, int h) {
imageData = BufferUtils.createByteBuffer(w * h * 4 + 8);
width = w;
height = h;
ilHandle = ImageLoader.createImageHandle();
}
I am at a loss as to what to do...
