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- CGSize initial_bounds; // portrait-mode size (pixels, not points).
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- GLfloat rotation_ratio; // ratio [0-1] thru rotation anim, or -1
- NSSize rot_current_size; // intermediate or at-rest orientation.
- NSSize rot_from, rot_to; // start/end size rect (pixels, not points)
- GLfloat rot_current_angle; // only right angles when rotation complete.
- GLfloat angle_from, angle_to; // start angle, end angle (degrees)
- double rot_start_time;
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- BOOL ignore_rotation_p; // whether hack requested "always portrait".