SkPoint.cpp File Reference

#include "include/core/SkPoint.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkFloatingPoint.h"
#include "src/core/SkPointPriv.h"
#include <cmath>

Go to the source code of this file.

Functions
template<bool use_rsqrt>
bool	set_point_length (SkPoint *pt, float x, float y, float length, float *orig_length=nullptr)

Function Documentation

set_point_length()

template<bool use_rsqrt>

bool set_point_length	(	SkPoint *	pt,
		float	x,
		float	y,
		float	length,
		float *	orig_length = nullptr
	)

Definition at line 42 of file SkPoint.cpp.

                                                                              {
    SkASSERT(!use_rsqrt || (orig_length == nullptr));
 
    // our mag2 step overflowed to infinity, so use doubles instead.
    // much slower, but needed when x or y are very large, other wise we
    // divide by inf. and return (0,0) vector.
    double xx = x;
    double yy = y;
    double dmag = sqrt(xx * xx + yy * yy);
    double dscale = sk_ieee_double_divide(length, dmag);
    x *= dscale;
    y *= dscale;
    // check if we're not finite, or we're zero-length
    if (!SkIsFinite(x, y) || (x == 0 && y == 0)) {
        pt->set(0, 0);
        return false;
    }
    float mag = 0;
    if (orig_length) {
        mag = sk_double_to_float(dmag);
    }
    pt->set(x, y);
    if (orig_length) {
        *orig_length = mag;
    }
    return true;
}