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The touchscreen orientation and scaling is handled via the Coordinate Transformation Matrix as described here. Check out the examples for different typical use cases and figure which one you need. In your case the X axis seems to already be inverted, so rotating by 90 degrees in addition should give (0 1 0 1 0 0 0 0 1) or (0 -1 1 -1 0 1 0 0 1), depending ...


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