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  /frameworks/native/services/sensorservice/
quat.h 68 const float Hx = R[0].x;
71 q.x = sqrtf( clamp( Hx - My - Az + 1) * 0.25f );
72 q.y = sqrtf( clamp(-Hx + My - Az + 1) * 0.25f );
73 q.z = sqrtf( clamp(-Hx - My + Az + 1) * 0.25f );
74 q.w = sqrtf( clamp( Hx + My + Az + 1) * 0.25f );
  /frameworks/base/core/java/android/hardware/
SensorManager.java 826 float Hx = Ey*Az - Ez*Ay;
829 final float normH = (float)Math.sqrt(Hx*Hx + Hy*Hy + Hz*Hz);
836 Hx *= invH;
844 final float My = Az*Hx - Ax*Hz;
845 final float Mz = Ax*Hy - Ay*Hx;
848 R[0] = Hx; R[1] = Hy; R[2] = Hz;
852 R[0] = Hx; R[1] = Hy; R[2] = Hz; R[3] = 0;
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