how to paste a small images inside SIO2widget's SIO2image

Hi:

I use SIO2widget to display one image as part of user interface.

...
uiWidget->_SIO2material->_SIO2image[ SIO2_MATERIAL_CHANNEL0 ] = BGImages[fortune_type * IMG_COUNT];
sio2WidgetRender( uiWidget, sio2->_SIO2window, 1 );
...

Then, the iPhone display the image loaded in BGImages[fortune_type * IMG_COUNT].

On this image, I also want to paste a small image such as arrow, then how can I do?

Thanks

1. Create another image with that arrow and swap them dynamically.

2. Directly access the pixels and draw on the image in code.

3. Use multi texture to combine/modulate a second image on the first one using the second channel of the material.