SkPathOpsCubic.cpp File Reference

#include "src/pathops/SkPathOpsCubic.h"
#include "include/private/base/SkFloatingPoint.h"
#include "include/private/base/SkTPin.h"
#include "include/private/base/SkTo.h"
#include "src/base/SkTSort.h"
#include "src/core/SkGeometry.h"
#include "src/pathops/SkIntersections.h"
#include "src/pathops/SkLineParameters.h"
#include "src/pathops/SkPathOpsConic.h"
#include "src/pathops/SkPathOpsQuad.h"
#include "src/pathops/SkPathOpsRect.h"
#include "src/pathops/SkPathOpsTypes.h"
#include <algorithm>
#include <cmath>

Go to the source code of this file.

Functions
static void	interp_cubic_coords (const double *src, double *dst, double t)
static double	derivative_at_t (const double *src, double t)
static void	formulate_F1DotF2 (const double src[], double coeff[4])
static double	interp_cubic_coords (const double *src, double t)

Variables
static const double	PI = 3.141592653589793

Function Documentation

derivative_at_t()

static double derivative_at_t ( const double *  src, double  t  )

static

Definition at line 245 of file SkPathOpsCubic.cpp.

                                                           {
    double one_t = 1 - t;
    double a = src[0];
    double b = src[2];
    double c = src[4];
    double d = src[6];
    return 3 * ((b - a) * one_t * one_t + 2 * (c - b) * t * one_t + (d - c) * t * t);
}

formulate_F1DotF2()

static void formulate_F1DotF2 ( const double  src[], double  coeff[4]  )

static

Definition at line 539 of file SkPathOpsCubic.cpp.

                                                                   {
    double a = src[2] - src[0];
    double b = src[4] - 2 * src[2] + src[0];
    double c = src[6] + 3 * (src[2] - src[4]) - src[0];
    coeff[0] = c * c;
    coeff[1] = 3 * b * c;
    coeff[2] = 2 * b * b + c * a;
    coeff[3] = a * b;
}

interp_cubic_coords() [1/2]

static void interp_cubic_coords ( const double *  src, double *  dst, double  t  )

static

Definition at line 94 of file SkPathOpsCubic.cpp.

                                                                          {
    double ab = SkDInterp(src[0], src[2], t);
    double bc = SkDInterp(src[2], src[4], t);
    double cd = SkDInterp(src[4], src[6], t);
    double abc = SkDInterp(ab, bc, t);
    double bcd = SkDInterp(bc, cd, t);
    double abcd = SkDInterp(abc, bcd, t);
 
    dst[0] = src[0];
    dst[2] = ab;
    dst[4] = abc;
    dst[6] = abcd;
    dst[8] = bcd;
    dst[10] = cd;
    dst[12] = src[6];
}

interp_cubic_coords() [2/2]

static double interp_cubic_coords ( const double *  src, double  t  )

static

Definition at line 656 of file SkPathOpsCubic.cpp.

                                                               {
    double ab = SkDInterp(src[0], src[2], t);
    double bc = SkDInterp(src[2], src[4], t);
    double cd = SkDInterp(src[4], src[6], t);
    double abc = SkDInterp(ab, bc, t);
    double bcd = SkDInterp(bc, cd, t);
    double abcd = SkDInterp(abc, bcd, t);
    return abcd;
}

Variable Documentation

PI

const double PI = 3.141592653589793

static

Definition at line 378 of file SkPathOpsCubic.cpp.