fix cubic/line intersection; add skp tests

tests/PathOpsOpTest.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"
 
 #define TEST(name) { name, #name }
 
@@ skipping 3292 matching lines @@
     path.moveTo(0, 0);
     path.quadTo(1, 8, 3, 5);
     path.lineTo(8, 1);
     path.close();
     pathB.moveTo(0, 0);
     pathB.quadTo(8, 1, 4, 8);
     pathB.close();
     testPathOp(reporter, path, pathB, kIntersect_PathOp, filename);
 }
 
+static void kari1(skiatest::Reporter* reporter, const char* filename) {
+    SkPath path1;
+    path1.moveTo(39.9375, -5.8359375);
+    path1.lineTo(40.625, -5.7890625);
+    path1.lineTo(37.7109375, 1.3515625);
+    path1.lineTo(37.203125, 0.9609375);
+    path1.close();
+
+    SkPath path2;
+    path2.moveTo(37.52734375f, -1.44140625f);
+    path2.cubicTo(37.8736991882324f, -1.69921875f, 38.1640625f, -2.140625f, 38.3984375f, -2.765625f);
+    path2.lineTo(38.640625f, -2.609375f);
+    path2.cubicTo(38.53125f, -1.89583337306976f, 38.0664443969727f, -0.154893040657043f, 38.0664443969727f, -0.154893040657043f);
+    path2.cubicTo(38.0664443969727f, -0.154893040657043f, 37.1809883117676f, -1.18359375f, 37.52734375, -1.44140625f);
+    path2.close();
+
+    testPathOp(reporter, path1, path2, kDifference_PathOp, filename);
+}
+
 static void (*firstTest)(skiatest::Reporter* , const char* filename) = 0;
 static void (*stopTest)(skiatest::Reporter* , const char* filename) = 0;
 
 static struct TestDesc tests[] = {
+    TEST(kari1),
     TEST(quadOp10i),
 #if 0  // FIXME: serpentine curve is ordered the wrong way
     TEST(cubicOp114),
 #endif
 #if 0  // FIXME: currently failing
     TEST(cubicOp113),
 #endif
 #if SKPS_WORKING
     // fails because a cubic/quadratic intersection is missed
     // the internal quad/quad is far enough away from the real cubic/quad that it is rejected
@@ skipping 240 matching lines @@
 };
 
 static const size_t failTestCount = SK_ARRAY_COUNT(failTests);
 
 DEF_TEST(PathOpsFailOp, reporter) {
 #if DEBUG_SHOW_TEST_NAME
     strncpy(DEBUG_FILENAME_STRING, "", DEBUG_FILENAME_STRING_LENGTH);
 #endif
     RunTestSet(reporter, failTests, failTestCount, 0, 0, false);
 }