use Sk2s for conics

tests/GeometryTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGeometry.h"
 #include "Test.h"
 #include "SkRandom.h"
@@ skipping 59 matching lines @@
             for (int k = 0; k < 5; ++k) {
                 check_pairs(reporter, i, t, "chop-quad",
                             dst0[k].fX, dst0[k].fY, dst1[k].fX, dst1[k].fY);
             }
 
             t += dt;
         }
     }
 }
 
+static void test_conic_eval_pos(skiatest::Reporter* reporter, const SkConic& conic, SkScalar t) {
+    SkPoint p0, p1;
+    conic.evalAt(t, &p0, NULL);
+    p1 = conic.evalAt(t);
+    check_pairs(reporter, 0, t, "conic-pos", p0.fX, p0.fY, p1.fX, p1.fY);
+}
+
+static void test_conic_eval_tan(skiatest::Reporter* reporter, const SkConic& conic, SkScalar t) {
+    SkVector v0, v1;
+    conic.evalAt(t, NULL, &v0);
+    v1 = conic.evalTangentAt(t);
+    check_pairs(reporter, 0, t, "conic-tan", v0.fX, v0.fY, v1.fX, v1.fY);
+}
+
+static void test_conic_chop_half(skiatest::Reporter* reporter, const SkConic& conic) {
+    SkConic dst0[2], dst1[2];
+    conic.chop(dst0);
+    conic.chop2(dst1);
+
+    for (int i = 0; i < 2; ++i) {
+        REPORTER_ASSERT(reporter, dst0[i].fW == dst1[i].fW);
+        for (int j = 0; j < 3; ++j) {
+            check_pairs(reporter, j, 0.5f, "conic-chop",
+                        dst0[i].fPts[j].fX, dst0[i].fPts[j].fY,
+                        dst0[i].fPts[j].fX, dst1[i].fPts[j].fY);
+        }
+    }
+}
+
+static void test_conic(skiatest::Reporter* reporter) {
+    SkRandom rand;
+    for (int i = 0; i < 1000; ++i) {
+        SkPoint pts[3];
+        for (int j = 0; j < 3; ++j) {
+            pts[j].set(rand.nextSScalar1() * 100, rand.nextSScalar1() * 100);
+        }
+        for (int k = 0; k < 10; ++k) {
+            SkScalar w = rand.nextUScalar1() * 2;
+            SkConic conic(pts, w);
+            test_conic_chop_half(reporter, conic);
+
+            const SkScalar dt = SK_Scalar1 / 128;
+            SkScalar t = dt;
+            for (int j = 1; j < 128; ++j) {
+                test_conic_eval_pos(reporter, conic, t);
+                test_conic_eval_tan(reporter, conic, t);
+                t += dt;
+            }
+        }
+    }
+}
+
 DEF_TEST(Geometry, reporter) {
     SkPoint pts[3], dst[5];
 
     pts[0].set(0, 0);
     pts[1].set(100, 50);
     pts[2].set(0, 100);
 
     int count = SkChopQuadAtMaxCurvature(pts, dst);
     REPORTER_ASSERT(reporter, count == 1 || count == 2);
 
     pts[0].set(0, 0);
     pts[1].set(SkIntToScalar(3), 0);
     pts[2].set(SkIntToScalar(3), SkIntToScalar(3));
     SkConvertQuadToCubic(pts, dst);
     const SkPoint cubic[] = {
         { 0, 0, },
         { SkIntToScalar(2), 0, },
         { SkIntToScalar(3), SkIntToScalar(1), },
         { SkIntToScalar(3), SkIntToScalar(3) },
     };
     for (int i = 0; i < 4; ++i) {
         REPORTER_ASSERT(reporter, nearly_equal(cubic[i], dst[i]));
     }
 
     testChopCubic(reporter);
     test_evalquadat(reporter);
+    test_conic(reporter);
 }