update GLES2-AnchorCenter
AndEngine/src/org/andengine/entity/util/ScreenGrabber.java
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);
final int[] pixels = new int[pGrabWidth * pGrabHeight];
for (int y = 0; y < pGrabHeight; y++) {
for (int x = 0; x < pGrabWidth; x++) {
pixels[x + ((pGrabHeight - y - 1) * pGrabWidth)] = pixelsARGB_8888[x + ((pGrabY + y) * pGrabWidth)];
}
}
return Bitmap.createBitmap(pixels, pGrabWidth, pGrabHeight, Config.ARGB_8888);
}