remove prototype pathops code

experimental/Intersection/LineParameterization.cpp

-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "CurveIntersection.h"
-
-/* This rejects coincidence with two muls, two adds, and one cmp.
-   Coincident candidates will take another four muls and two adds, but may still
-   fail if they don't overlap. (The overlap test isn't performed here.)
- */
-bool implicit_matches(const _Line& one, const _Line& two) {
-    _Point oneD, twoD;
-    tangent(one, oneD);
-    tangent(two, twoD);
-    /* See if the slopes match, i.e.
-                        dx1 / dy1 ==               dx2 / dy2
-          (dy1 * dy2) * dx1 / dy1 == (dy1 * dy2) * dx2 / dy2
-                 dy2  * dx1       ==  dy1        * dx2
-     */
-    if (!AlmostEqualUlps(oneD.x * twoD.y, twoD.x * oneD.y)) {
-        return false;
-    }
-    /* See if the axis intercepts match, i.e.
-               y0 - x0 * dy / dx  ==       y1 - x1 * dy / dx
-         dx * (y0 - x0 * dy / dx) == dx * (y1 - x1 * dy / dx)
-         dx *  y0 - x0 * dy       == dx *  y1 - x1 * dy
-     */
-    if (!AlmostEqualUlps(oneD.x * one[0].y - oneD.y * one[0].x,
-            oneD.x * two[0].y - oneD.y * two[0].x)) {
-        return false;
-    }
-    return true;
-}
-
-bool implicit_matches_ulps(const _Line& one, const _Line& two, int ulps) {
-    _Point oneD, twoD;
-    tangent(one, oneD);
-    tangent(two, twoD);
-    /* See if the slopes match, i.e.
-                        dx1 / dy1 ==               dx2 / dy2
-          (dy1 * dy2) * dx1 / dy1 == (dy1 * dy2) * dx2 / dy2
-                 dy2  * dx1       ==  dy1        * dx2
-     */
-    int diff = UlpsDiff((float) (oneD.x * twoD.y), (float) (twoD.x * oneD.y));
-    if (diff < 0 || diff > ulps) {
-        return false;
-    }
-    /* See if the axis intercepts match, i.e.
-               y0 - x0 * dy / dx  ==       y1 - x1 * dy / dx
-         dx * (y0 - x0 * dy / dx) == dx * (y1 - x1 * dy / dx)
-         dx *  y0 - x0 * dy       == dx *  y1 - x1 * dy
-     */
-    diff = UlpsDiff((float) (oneD.x * one[0].y - oneD.y * one[0].x),
-            (float) (oneD.x * two[0].y - oneD.y * two[0].x));
-    return diff >= 0 && diff <= ulps;
-}
-
-void tangent(const _Line& line,  _Point& result) {
-    result.x = line[0].x - line[1].x;
-    result.y = line[0].y - line[1].y;
-}