Gen2: ImageManip rotated/arbitrary cropping, camera controls

[alex-luxonis]

Add types defined similar to some OpenCV ones:

• Point2f: {float x, y;}
• Size2f: {float width, height;}
• RotatedRect: {Point2f center; Size2f size; float angle;}

And for arbitrary cropping, I was thinking on defining a sequence of 4 points in clockwise order forming a quadrilateral, that would get mapped to a rectangle, whose size we specify (so resizing + other warp transforms can be applied). First sequence point would get mapped to the top-left corner of the rectangle.

 0___1       0 ____ 1
 /   \   ->   |    |
/_____\       |____|
3     2      3      2

These are still open to ideas for improvement.

[themarpe]

Does the intermediate rectangle size adds any additional benefits compared to just the final output size?

[alex-luxonis]

Does the intermediate rectangle size adds any additional benefits compared to just the final output size?

For the rotated rectangle (center, size, angle), it describes the crop area, that can be further resized.
For the quadrilateral (that I renamed it now to warpFourPoints), I removed the size specification, and it is auto-computed based on the points geometry, if the final resize is not specified.