fix tiger b

The tiger tests have uncovered numerous bugs.
This CL fixes the last of them.

If a pair of curves do not intersect, but
have one or both ends very close to the opposite
curve, consider that an intersection.

TBR=reed@google.com
BUG=skia:5131
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2356363003

Review-Url: https://codereview.chromium.org/2356363003

1 files changed, 69 insertions, 0 deletions

diff --git a/tests/PathOpsConicQuadIntersectionTest.cpp b/tests/PathOpsConicQuadIntersectionTest.cpp
new file mode 100644
index 0000000000..5996cf804c
--- /dev/null
+++ b/tests/PathOpsConicQuadIntersectionTest.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "PathOpsTestCommon.h"
+#include "SkIntersections.h"
+#include "SkPathOpsConic.h"
+#include "SkPathOpsQuad.h"
+#include "SkReduceOrder.h"
+#include "Test.h"
+
+static struct conicQuad {
+    SkDConic conic;
+    SkDQuad quad;
+} conicQuadTests[] = {
+   {{{{{494.348663,224.583771}, {494.365143,224.633194}, {494.376404,224.684067}}}, 0.998645842f},
+    {{{494.30481,224.474213}, {494.334961,224.538284}, {494.355774,224.605927}}}},
+
+   {{{{{494.348663,224.583771}, {494.365143,224.633194}, {494.376404,224.684067}}}, 0.998645842f},
+    {{{494.355774f, 224.605927f}, {494.363708f, 224.631714f}, {494.370148f, 224.657471f}}}},
+};
+
+static const int conicQuadTests_count = (int) SK_ARRAY_COUNT(conicQuadTests);
+
+static void conicQuadIntersection(skiatest::Reporter* reporter, int index) {
+    const SkDConic& conic = conicQuadTests[index].conic;
+    SkASSERT(ValidConic(conic));
+    const SkDQuad& quad = conicQuadTests[index].quad;
+    SkASSERT(ValidQuad(quad));
+    SkReduceOrder reduce1;
+    SkReduceOrder reduce2;
+    int order1 = reduce2.reduce(conic.fPts);
+    int order2 = reduce1.reduce(quad);
+    if (order2 != 3) {
+        SkDebugf("[%d] conic order=%d\n", index, order1);
+        REPORTER_ASSERT(reporter, 0);
+    }
+    if (order1 != 3) {
+        SkDebugf("[%d] quad order=%d\n", index, order2);
+        REPORTER_ASSERT(reporter, 0);
+    }
+    SkIntersections i;
+    int roots = i.intersect(conic, quad);
+    for (int pt = 0; pt < roots; ++pt) {
+        double tt1 = i[0][pt];
+        SkDPoint xy1 = conic.ptAtT(tt1);
+        double tt2 = i[1][pt];
+        SkDPoint xy2 = quad.ptAtT(tt2);
+        if (!xy1.approximatelyEqual(xy2)) {
+            SkDebugf("%s [%d,%d] x!= t1=%g (%g,%g) t2=%g (%g,%g)\n",
+                __FUNCTION__, index, pt, tt1, xy1.fX, xy1.fY, tt2, xy2.fX, xy2.fY);
+        }
+        REPORTER_ASSERT(reporter, xy1.approximatelyEqual(xy2));
+    }
+    reporter->bumpTestCount();
+}
+
+DEF_TEST(PathOpsConicQuadIntersection, reporter) {
+    for (int index = 0; index < conicQuadTests_count; ++index) {
+        conicQuadIntersection(reporter, index);
+        reporter->bumpTestCount();
+    }
+}
+
+DEF_TEST(PathOpsConicQuadIntersectionOneOff, reporter) {
+    conicQuadIntersection(reporter, 1);
+}