import org.andengine.opengl.util.GLHelper; //导入依赖的package包/类
private static Bitmap grab(final int pGrabX, final int pGrabY, final int pGrabWidth, final int pGrabHeight) {
	final int[] pixelsRGBA_8888 = new int[pGrabWidth * pGrabHeight];
	final IntBuffer pixelsRGBA_8888_Buffer = IntBuffer.wrap(pixelsRGBA_8888);

	// TODO Check availability of OpenGL and GLES20.GL_RGBA combinations that require less conversion operations.
	GLES20.glReadPixels(pGrabX, pGrabY, pGrabWidth, pGrabHeight, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, pixelsRGBA_8888_Buffer);

	/* Convert from RGBA_8888 (Which is actually ABGR as the whole buffer seems to be inverted) --> ARGB_8888. */
	final int[] pixelsARGB_8888 = GLHelper.convertRGBA_8888toARGB_8888(pixelsRGBA_8888);

	return Bitmap.createBitmap(pixelsARGB_8888, pGrabWidth, pGrabHeight, Config.ARGB_8888);
}
 

import org.andengine.opengl.util.GLHelper; //导入依赖的package包/类
public int[] getPixelsARGB_8888(final GLState pGLState, final int pX, final int pY, final int pWidth, final int pHeight) {
	final int[] pixelsRGBA_8888 = new int[pWidth * pHeight];
	final IntBuffer glPixelBuffer = IntBuffer.wrap(pixelsRGBA_8888);
	glPixelBuffer.position(0);

	this.begin(pGLState);
	GLES20.glReadPixels(pX, pY, pWidth, pHeight, this.mPixelFormat.getGLFormat(), this.mPixelFormat.getGLType(), glPixelBuffer);
	this.end(pGLState);

	return GLHelper.convertRGBA_8888toARGB_8888(pixelsRGBA_8888);
}
 

import org.andengine.opengl.util.GLHelper; //导入依赖的package包/类
protected static final Bitmap swapColorARGB_8888(final Bitmap pBitmap, final int pColorKeyColorARGBPackedInt, final int pTolerance, final int pColorSwapColorARGBPackedInt) {
	final int[] pixelsARGB_8888 = GLHelper.getPixelsARGB_8888(pBitmap);
	pBitmap.recycle();

	final int keyRed = (pColorKeyColorARGBPackedInt >> Color.ARGB_PACKED_RED_SHIFT) & 0xFF;
	final int keyGreen = (pColorKeyColorARGBPackedInt >> Color.ARGB_PACKED_GREEN_SHIFT) & 0xFF;
	final int keyBlue = (pColorKeyColorARGBPackedInt >> Color.ARGB_PACKED_BLUE_SHIFT) & 0xFF;
	final int keyAlpha = (pColorKeyColorARGBPackedInt >> Color.ARGB_PACKED_ALPHA_SHIFT) & 0xFF;

	for (int i = pixelsARGB_8888.length - 1; i >= 0; i--) {
		final int pixelARGB_8888 = pixelsARGB_8888[i];

		final int red = (pixelARGB_8888 >> Color.ARGB_PACKED_RED_SHIFT) & 0xFF;
		if (Math.abs(red - keyRed) <= pTolerance) {
			final int green = (pixelARGB_8888 >> Color.ARGB_PACKED_GREEN_SHIFT) & 0xFF;
			if (Math.abs(green - keyGreen) <= pTolerance) {
				final int blue = (pixelARGB_8888 >> Color.ARGB_PACKED_BLUE_SHIFT) & 0xFF;
				if (Math.abs(blue - keyBlue) <= pTolerance) {
					final int alpha = (pixelARGB_8888 >> Color.ARGB_PACKED_ALPHA_SHIFT) & 0xFF;
					if (Math.abs(alpha - keyAlpha) <= pTolerance) {
						pixelsARGB_8888[i] = pColorSwapColorARGBPackedInt;
					}
				}
			}
		}
	}

	return Bitmap.createBitmap(pixelsARGB_8888, pBitmap.getWidth(), pBitmap.getHeight(), Config.ARGB_8888);
}