add unittest for IntersectLine, used by hairlines
git-svn-id: http://skia.googlecode.com/svn/trunk@447 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/ClipperTest.cpp b/tests/ClipperTest.cpp
new file mode 100644
index 0000000..66301fc
--- /dev/null
+++ b/tests/ClipperTest.cpp
@@ -0,0 +1,89 @@
+#include "Test.h"
+#include "SkPath.h"
+#include "SkLineClipper.h"
+#include "SkEdgeClipper.h"
+
+static void test_intersectline(skiatest::Reporter* reporter) {
+ static const SkScalar L = 0;
+ static const SkScalar T = 0;
+ static const SkScalar R = SkIntToScalar(100);
+ static const SkScalar B = SkIntToScalar(100);
+ static const SkScalar CX = SkScalarHalf(L + R);
+ static const SkScalar CY = SkScalarHalf(T + B);
+ static const SkRect gR = { L, T, R, B };
+
+ size_t i;
+ SkPoint dst[2];
+
+ static const SkPoint gEmpty[] = {
+ // sides
+ { L, CY }, { L - 10, CY },
+ { R, CY }, { R + 10, CY },
+ { CX, T }, { CX, T - 10 },
+ { CX, B }, { CX, B + 10 },
+ // corners
+ { L, T }, { L - 10, T - 10 },
+ { L, B }, { L - 10, B + 10 },
+ { R, T }, { R + 10, T - 10 },
+ { R, B }, { R + 10, B + 10 },
+ };
+ for (i = 0; i < SK_ARRAY_COUNT(gEmpty); i += 2) {
+ bool valid = SkLineClipper::IntersectLine(&gEmpty[i], gR, dst);
+ if (valid) {
+ SkDebugf("----- [%d] %g %g -> %g %g\n", i/2, dst[0].fX, dst[0].fY, dst[1].fX, dst[1].fY);
+ }
+ REPORTER_ASSERT(reporter, !valid);
+ }
+
+ static const SkPoint gFull[] = {
+ // diagonals, chords
+ { L, T }, { R, B },
+ { L, B }, { R, T },
+ { CX, T }, { CX, B },
+ { L, CY }, { R, CY },
+ { CX, T }, { R, CY },
+ { CX, T }, { L, CY },
+ { L, CY }, { CX, B },
+ { R, CY }, { CX, B },
+ // edges
+ { L, T }, { L, B },
+ { R, T }, { R, B },
+ { L, T }, { R, T },
+ { L, B }, { R, B },
+ };
+ for (i = 0; i < SK_ARRAY_COUNT(gFull); i += 2) {
+ bool valid = SkLineClipper::IntersectLine(&gFull[i], gR, dst);
+ if (!valid || memcmp(&gFull[i], dst, sizeof(dst))) {
+ SkDebugf("++++ [%d] %g %g -> %g %g\n", i/2, dst[0].fX, dst[0].fY, dst[1].fX, dst[1].fY);
+ }
+ REPORTER_ASSERT(reporter, valid && !memcmp(&gFull[i], dst, sizeof(dst)));
+ }
+
+ static const SkPoint gPartial[] = {
+ { L - 10, CY }, { CX, CY }, { L, CY }, { CX, CY },
+ { CX, T - 10 }, { CX, CY }, { CX, T }, { CX, CY },
+ { R + 10, CY }, { CX, CY }, { R, CY }, { CX, CY },
+ { CX, B + 10 }, { CX, CY }, { CX, B }, { CX, CY },
+ // extended edges
+ { L, T - 10 }, { L, B + 10 }, { L, T }, { L, B },
+ { R, T - 10 }, { R, B + 10 }, { R, T }, { R, B },
+ { L - 10, T }, { R + 10, T }, { L, T }, { R, T },
+ { L - 10, B }, { R + 10, B }, { L, B }, { R, B },
+ };
+ for (i = 0; i < SK_ARRAY_COUNT(gPartial); i += 4) {
+ bool valid = SkLineClipper::IntersectLine(&gPartial[i], gR, dst);
+ if (!valid || memcmp(&gPartial[i+2], dst, sizeof(dst))) {
+ SkDebugf("++++ [%d] %g %g -> %g %g\n", i/2, dst[0].fX, dst[0].fY, dst[1].fX, dst[1].fY);
+ }
+ REPORTER_ASSERT(reporter, valid &&
+ !memcmp(&gPartial[i+2], dst, sizeof(dst)));
+ }
+
+}
+
+void TestClipper(skiatest::Reporter* reporter) {
+ test_intersectline(reporter);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("Clipper", TestClipperClass, TestClipper)