SkPathOpsConic.cpp File Reference

#include "src/pathops/SkPathOpsConic.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkFloatingPoint.h"
#include "src/pathops/SkIntersections.h"
#include "src/pathops/SkPathOpsCubic.h"
#include "src/pathops/SkPathOpsQuad.h"
#include "src/pathops/SkPathOpsRect.h"
#include "src/pathops/SkPathOpsTypes.h"
#include <cmath>

Go to the source code of this file.

Functions
static void	conic_deriv_coeff (const double src[], SkScalar w, double coeff[3])
static double	conic_eval_tan (const double coord[], SkScalar w, double t)
static double	conic_eval_numerator (const double src[], SkScalar w, double t)
static double	conic_eval_denominator (SkScalar w, double t)

Function Documentation

conic_deriv_coeff()

static void conic_deriv_coeff ( const double  src[], SkScalar  w, double  coeff[3]  )

static

Definition at line 22 of file SkPathOpsConic.cpp.

                                               {
    const double P20 = src[4] - src[0];
    const double P10 = src[2] - src[0];
    const double wP10 = w * P10;
    coeff[0] = w * P20 - P20;
    coeff[1] = P20 - 2 * wP10;
    coeff[2] = wP10;
}

conic_eval_denominator()

static double conic_eval_denominator ( SkScalar  w, double  t  )

static

Definition at line 84 of file SkPathOpsConic.cpp.

                                                           {
    double B = 2 * (w - 1);
    double C = 1;
    double A = -B;
    return (A * t + B) * t + C;
}

conic_eval_numerator()

static double conic_eval_numerator ( const double  src[], SkScalar  w, double  t  )

static

Definition at line 73 of file SkPathOpsConic.cpp.

                                                                             {
    SkASSERT(src);
    SkASSERT(t >= 0 && t <= 1);
    double src2w = src[2] * w;
    double C = src[0];
    double A = src[4] - 2 * src2w + C;
    double B = 2 * (src2w - C);
    return (A * t + B) * t + C;
}

conic_eval_tan()

static double conic_eval_tan ( const double  coord[], SkScalar  w, double  t  )

static

Definition at line 33 of file SkPathOpsConic.cpp.

                                                                         {
    double coeff[3];
    conic_deriv_coeff(coord, w, coeff);
    return t * (t * coeff[0] + coeff[1]) + coeff[2];
}