add unittests for clip-state queries

BUG=skia:

Change-Id: I6f8d5a0e78c5b41caa6c6388f7f2ace050ed08ac
Reviewed-on: https://skia-review.googlesource.com/9171
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Mike Reed <reed@google.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/CanvasTest.cpp b/tests/CanvasTest.cpp
index c947ce42ad..af18938bc5 100644
--- a/tests/CanvasTest.cpp
+++ b/tests/CanvasTest.cpp
@@ -813,3 +813,32 @@ DEF_TEST(CanvasStack, r) {
     REPORTER_ASSERT(r, !life[0]);
     REPORTER_ASSERT(r, !life[1]);
 }
+
+DEF_TEST(CanvasClipType, r) {
+    sk_sp<SkSurface> surf = SkSurface::MakeRasterN32Premul(10, 10);
+    SkCanvas* canvas = surf->getCanvas();
+
+    REPORTER_ASSERT(r, !canvas->isClipEmpty());
+    REPORTER_ASSERT(r, canvas->isClipRect());
+
+    canvas->save();
+    canvas->clipRect({0, 0, 0, 0});
+    REPORTER_ASSERT(r, canvas->isClipEmpty());
+    REPORTER_ASSERT(r, !canvas->isClipRect());
+    canvas->restore();
+
+    canvas->save();
+    canvas->clipRect({2, 2, 6, 6});
+    REPORTER_ASSERT(r, !canvas->isClipEmpty());
+    REPORTER_ASSERT(r, canvas->isClipRect());
+    canvas->restore();
+
+    canvas->save();
+    canvas->clipRect({2, 2, 6, 6}, SkClipOp::kDifference);  // punch a hole in the clip
+    REPORTER_ASSERT(r, !canvas->isClipEmpty());
+    REPORTER_ASSERT(r, !canvas->isClipRect());
+    canvas->restore();
+
+    REPORTER_ASSERT(r, !canvas->isClipEmpty());
+    REPORTER_ASSERT(r, canvas->isClipRect());
+}