add tests for SkClipStack

git-svn-id: http://skia.googlecode.com/svn/trunk@828 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/ClipStackTest.cpp b/tests/ClipStackTest.cpp
new file mode 100644
index 0000000000..e3c95b417d
--- /dev/null
+++ b/tests/ClipStackTest.cpp
@@ -0,0 +1,49 @@
+#include "Test.h"
+#include "SkClipStack.h"
+
+static void assert_count(skiatest::Reporter* reporter, const SkClipStack& stack,
+                         int count) {
+    REPORTER_ASSERT(reporter, count == stack.getSaveCount());
+
+    SkClipStack::B2FIter iter(stack);
+    int counter = 0;
+    while (iter.next()) {
+        counter += 1;
+    }
+    REPORTER_ASSERT(reporter, count == counter);
+}
+
+static void TestClipStack(skiatest::Reporter* reporter) {
+    SkClipStack stack;
+
+    assert_count(reporter, stack, 0);
+
+    static const SkIRect gRects[] = {
+        { 0, 0, 100, 100 },
+        { 25, 25, 125, 125 },
+        { 0, 0, 1000, 1000 },
+        { 0, 0, 75, 75 }
+    };
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gRects); i++) {
+        stack.clipDevRect(gRects[i]);
+    }
+
+    // all of the above rects should have been intersected, leaving only 1 rect
+    SkClipStack::B2FIter iter(stack);
+    const SkClipStack::B2FIter::Clip* clip = iter.next();
+    const SkRect answer = { 25, 25, 75, 75 };
+
+    REPORTER_ASSERT(reporter, clip);
+    REPORTER_ASSERT(reporter, clip->fRect);
+    REPORTER_ASSERT(reporter, !clip->fPath);
+    REPORTER_ASSERT(reporter, SkRegion::kIntersect_Op == clip->fOp);
+    REPORTER_ASSERT(reporter, *clip->fRect == answer);
+    // now check that we only had one in our iterator
+    REPORTER_ASSERT(reporter, !iter.next());
+
+    stack.reset();
+    assert_count(reporter, stack, 0);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("ClipStack", TestClipStackClass, TestClipStack)