com.badlogic.gdx.backends.lwjgl.LwjglCursor Maven / Gradle / Ivy

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package com.badlogic.gdx.backends.lwjgl;

import java.nio.ByteOrder;
import java.nio.IntBuffer;

import com.badlogic.gdx.utils.Os;
import org.lwjgl.LWJGLException;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Cursor;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.utils.GdxRuntimeException;
import com.badlogic.gdx.utils.SharedLibraryLoader;

public class LwjglCursor implements Cursor {
	org.lwjgl.input.Cursor lwjglCursor = null;

	public LwjglCursor (Pixmap pixmap, int xHotspot, int yHotspot) {
		if (((LwjglGraphics)Gdx.graphics).canvas != null && SharedLibraryLoader.os == Os.MacOsX) {
			return;
		}
		try {
			if (pixmap == null) {
				lwjglCursor = null;
				return;
			}

			if (pixmap.getFormat() != Pixmap.Format.RGBA8888) {
				throw new GdxRuntimeException("Cursor image pixmap is not in RGBA8888 format.");
			}

			if ((pixmap.getWidth() & (pixmap.getWidth() - 1)) != 0) {
				throw new GdxRuntimeException(
					"Cursor image pixmap width of " + pixmap.getWidth() + " is not a power-of-two greater than zero.");
			}

			if ((pixmap.getHeight() & (pixmap.getHeight() - 1)) != 0) {
				throw new GdxRuntimeException(
					"Cursor image pixmap height of " + pixmap.getHeight() + " is not a power-of-two greater than zero.");
			}

			if (xHotspot < 0 || xHotspot >= pixmap.getWidth()) {
				throw new GdxRuntimeException(
					"xHotspot coordinate of " + xHotspot + " is not within image width bounds: [0, " + pixmap.getWidth() + ").");
			}

			if (yHotspot < 0 || yHotspot >= pixmap.getHeight()) {
				throw new GdxRuntimeException(
					"yHotspot coordinate of " + yHotspot + " is not within image height bounds: [0, " + pixmap.getHeight() + ").");
			}

			// Convert from RGBA8888 to ARGB8888 and flip vertically
			IntBuffer pixelBuffer = pixmap.getPixels().asIntBuffer();
			int[] pixelsRGBA = new int[pixelBuffer.capacity()];
			pixelBuffer.get(pixelsRGBA);
			int[] pixelsARGBflipped = new int[pixelBuffer.capacity()];
			int pixel;
			if (pixelBuffer.order() == ByteOrder.BIG_ENDIAN) {
				for (int y = 0; y < pixmap.getHeight(); ++y) {
					for (int x = 0; x < pixmap.getWidth(); ++x) {
						pixel = pixelsRGBA[x + (y * pixmap.getWidth())];
						pixelsARGBflipped[x + ((pixmap.getHeight() - 1 - y) * pixmap.getWidth())] = ((pixel >> 8) & 0x00FFFFFF)
							| ((pixel << 24) & 0xFF000000);
					}
				}
			} else {
				for (int y = 0; y < pixmap.getHeight(); ++y) {
					for (int x = 0; x < pixmap.getWidth(); ++x) {
						pixel = pixelsRGBA[x + (y * pixmap.getWidth())];
						pixelsARGBflipped[x + ((pixmap.getHeight() - 1 - y) * pixmap.getWidth())] = ((pixel & 0xFF) << 16)
							| ((pixel & 0xFF0000) >> 16) | (pixel & 0xFF00FF00);
					}
				}
			}

			lwjglCursor = new org.lwjgl.input.Cursor(pixmap.getWidth(), pixmap.getHeight(), xHotspot,
				pixmap.getHeight() - yHotspot - 1, 1, IntBuffer.wrap(pixelsARGBflipped), null);
		} catch (LWJGLException e) {
			throw new GdxRuntimeException("Could not create cursor image.", e);
		}
	}

	@Override
	public void dispose () {
	}
}