fix cubic/line intersection; add skp tests

tests/PathOpsExtendedTest.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 "PathOpsThreadedCommon.h"
 #include "SkBitmap.h"
@@ skipping 392 matching lines @@
         const SkPathOp shapeOp, const SkMatrix& scale) {
     SkASSERT((unsigned) shapeOp < SK_ARRAY_COUNT(opStrs));
     SkString defaultTestName;
     if (!testName) {
         defaultTestName.printf("xOp%d%s", gTestNo, opSuffixes[shapeOp]);
         testName = defaultTestName.c_str();
     }
     SkDebugf("static void %s(skiatest::Reporter* reporter, const char* filename) {\n", testName);
     *gTestOp.append() = shapeOp;
     ++gTestNo;
+    SkDebugf("\n*** this test fails ***\n");
     SkDebugf("    SkPath path, pathB;\n");
     showPath(a, "path", false);
     showPath(b, "pathB", false);
     SkDebugf("    testPathOp(reporter, path, pathB, %s, filename);\n", opStrs[shapeOp]);
     SkDebugf("}\n");
-    drawAsciiPaths(scaledOne, scaledTwo, false);
+    drawAsciiPaths(scaledOne, scaledTwo, true);
 }
 
 void ShowTestArray() {
     for (int x = gTestFirst; x < gTestNo; ++x) {
         SkDebugf("    TEST(xOp%d%s),\n", x, opSuffixes[gTestOp[x - gTestFirst]]);
     }
 }
 
 static int comparePaths(skiatest::Reporter* reporter, const char* testName, const SkPath& one,
         const SkPath& scaledOne, const SkPath& two, const SkPath& scaledTwo, SkBitmap& bitmap,
@@ skipping 310 matching lines @@
         if (tests[index].fun == stopTest) {
             SkDebugf("lastTest\n");
             break;
         }
         if (index == last) {
             break;
         }
         index += reverse ? -1 : 1;
     } while (true);
 }