add conics to path ops

tests/PathOpsConicLineIntersectionTest.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 "PathOpsExtendedTest.h"
+#include "PathOpsTestCommon.h"
+#include "SkIntersections.h"
+#include "SkPathOpsConic.h"
+#include "SkPathOpsLine.h"
+#include "SkReduceOrder.h"
+#include "Test.h"
+
+static struct lineConic {
+    SkDConic conic;
+    SkDLine line;
+    int result;
+    SkDPoint expected[2];
+} lineConicTests[] = {
+    {
+     {{{{30.6499996,25.6499996}, {30.6499996,20.6499996}, {25.6499996,20.6499996}}}, 0.707107008f},
+      {{{25.6499996,20.6499996}, {45.6500015,20.6499996}}},
+          1, 
+       {{25.6499996,20.6499996}, {0,0}}
+    },
+};
+
+static size_t lineConicTests_count = SK_ARRAY_COUNT(lineConicTests);
+
+static int doIntersect(SkIntersections& intersections, const SkDConic& conic, const SkDLine& line,
+                       bool& flipped) {
+    int result;
+    flipped = false;
+    if (line[0].fX == line[1].fX) {
+        double top = line[0].fY;
+        double bottom = line[1].fY;
+        flipped = top > bottom;
+        if (flipped) {
+            SkTSwap<double>(top, bottom);
+        }
+        result = intersections.vertical(conic, top, bottom, line[0].fX, flipped);
+    } else if (line[0].fY == line[1].fY) {
+        double left = line[0].fX;
+        double right = line[1].fX;
+        flipped = left > right;
+        if (flipped) {
+            SkTSwap<double>(left, right);
+        }
+        result = intersections.horizontal(conic, left, right, line[0].fY, flipped);
+    } else {
+        intersections.intersect(conic, line);
+        result = intersections.used();
+    }
+    return result;
+}
+
+static struct oneLineConic {
+    SkDConic conic;
+    SkDLine line;
+} oneOffs[] = {
+    {{{{{30.6499996,25.6499996}, {30.6499996,20.6499996}, {25.6499996,20.6499996}}}, 0.707107008f},
+      {{{25.6499996,20.6499996}, {45.6500015,20.6499996}}}}
+};
+
+static size_t oneOffs_count = SK_ARRAY_COUNT(oneOffs);
+
+static void testOneOffs(skiatest::Reporter* reporter) {
+    bool flipped = false;
+    for (size_t index = 0; index < oneOffs_count; ++index) {
+        const SkDConic& conic = oneOffs[index].conic;
+        SkASSERT(ValidConic(conic));
+        const SkDLine& line = oneOffs[index].line;
+        SkASSERT(ValidLine(line));
+        SkIntersections intersections;
+        int result = doIntersect(intersections, conic, line, flipped);
+        for (int inner = 0; inner < result; ++inner) {
+            double conicT = intersections[0][inner];
+            SkDPoint conicXY = conic.ptAtT(conicT);
+            double lineT = intersections[1][inner];
+            SkDPoint lineXY = line.ptAtT(lineT);
+            if (!conicXY.approximatelyEqual(lineXY)) {
+                conicXY.approximatelyEqual(lineXY);
+                SkDebugf("");
+            }
+            REPORTER_ASSERT(reporter, conicXY.approximatelyEqual(lineXY));
+        }
+    }
+}
+
+DEF_TEST(PathOpsConicLineIntersectionOneOff, reporter) {
+    testOneOffs(reporter);
+}
+
+DEF_TEST(PathOpsConicLineIntersection, reporter) {
+    for (size_t index = 0; index < lineConicTests_count; ++index) {
+        int iIndex = static_cast<int>(index);
+        const SkDConic& conic = lineConicTests[index].conic;
+        SkASSERT(ValidConic(conic));
+        const SkDLine& line = lineConicTests[index].line;
+        SkASSERT(ValidLine(line));
+        SkReduceOrder reducer;
+        SkPoint pts[3] = { conic.fPts.fPts[0].asSkPoint(), conic.fPts.fPts[1].asSkPoint(), 
+            conic.fPts.fPts[2].asSkPoint() };
+        SkPoint reduced[3];
+        SkPath::Verb order1 = SkReduceOrder::Conic(pts, conic.fWeight, reduced);
+        if (order1 != SkPath::kConic_Verb) {
+            SkDebugf("%s [%d] conic verb=%d\n", __FUNCTION__, iIndex, order1);
+            REPORTER_ASSERT(reporter, 0);
+        }
+        int order2 = reducer.reduce(line);
+        if (order2 < 2) {
+            SkDebugf("%s [%d] line order=%d\n", __FUNCTION__, iIndex, order2);
+            REPORTER_ASSERT(reporter, 0);
+        }
+        SkIntersections intersections;
+        bool flipped = false;
+        int result = doIntersect(intersections, conic, line, flipped);
+        REPORTER_ASSERT(reporter, result == lineConicTests[index].result);
+        if (intersections.used() <= 0) {
+            continue;
+        }
+        for (int pt = 0; pt < result; ++pt) {
+            double tt1 = intersections[0][pt];
+            REPORTER_ASSERT(reporter, tt1 >= 0 && tt1 <= 1);
+            SkDPoint t1 = conic.ptAtT(tt1);
+            double tt2 = intersections[1][pt];
+            REPORTER_ASSERT(reporter, tt2 >= 0 && tt2 <= 1);
+            SkDPoint t2 = line.ptAtT(tt2);
+            if (!t1.approximatelyEqual(t2)) {
+                SkDebugf("%s [%d,%d] x!= t1=%1.9g (%1.9g,%1.9g) t2=%1.9g (%1.9g,%1.9g)\n",
+                    __FUNCTION__, iIndex, pt, tt1, t1.fX, t1.fY, tt2, t2.fX, t2.fY);
+                REPORTER_ASSERT(reporter, 0);
+            }
+            if (!t1.approximatelyEqual(lineConicTests[index].expected[0])
+                    && (lineConicTests[index].result == 1
+                    || !t1.approximatelyEqual(lineConicTests[index].expected[1]))) {
+                SkDebugf("%s t1=(%1.9g,%1.9g)\n", __FUNCTION__, t1.fX, t1.fY);
+                REPORTER_ASSERT(reporter, 0);
+            }
+        }
+    }
+}