Depthimage_to_laserscan package - depth_msg->data[0] doubt

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HI everyone! I have 2 questions regarding this package:

1 - When the convert routine fetches the data from depth_msg->data[0], I assume the data is stored in row-major order, but I'm still unsure of the exact coordinates of the image to where the variable points. Anyone can help with this question?

2 - To add to my confusion, further ahead, the offset value that provides the offset to the center of the image has a low negative value. Anyone can explain this to me?

Thank you!