add unittest for matrix::flatten

define constant for max value flatten/unflatten can return (so clients can put
the buffer on the stack)



git-svn-id: http://skia.googlecode.com/svn/trunk@243 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 68e587bd49..052687da34 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -27,6 +27,25 @@ static bool is_identity(const SkMatrix& m) {
     return nearly_equal(m, identity);
 }
 
+static void test_flatten(skiatest::Reporter* reporter, const SkMatrix& m) {
+    // add 100 in case we have a bug, I don't want to kill my stack in the test
+    char buffer[SkMatrix::kMaxFlattenSize + 100];
+    uint32_t size1 = m.flatten(NULL);
+    uint32_t size2 = m.flatten(buffer);
+    REPORTER_ASSERT(reporter, size1 == size2);
+    REPORTER_ASSERT(reporter, size1 <= SkMatrix::kMaxFlattenSize);
+    
+    SkMatrix m2;
+    uint32_t size3 = m2.unflatten(buffer);
+    REPORTER_ASSERT(reporter, size1 == size2);
+    REPORTER_ASSERT(reporter, m == m2);
+    
+    char buffer2[SkMatrix::kMaxFlattenSize + 100];
+    size3 = m2.flatten(buffer2);
+    REPORTER_ASSERT(reporter, size1 == size2);
+    REPORTER_ASSERT(reporter, memcmp(buffer, buffer2, size1) == 0);
+}
+
 void TestMatrix(skiatest::Reporter* reporter) {
     SkMatrix    mat, inverse, iden1, iden2;
 
@@ -40,11 +59,13 @@ void TestMatrix(skiatest::Reporter* reporter) {
     mat.invert(&inverse);
     iden1.setConcat(mat, inverse);
     REPORTER_ASSERT(reporter, is_identity(iden1));
+    test_flatten(reporter, mat);
 
     mat.setScale(SK_Scalar1/2, SK_Scalar1/2);
     mat.invert(&inverse);
     iden1.setConcat(mat, inverse);
     REPORTER_ASSERT(reporter, is_identity(iden1));
+    test_flatten(reporter, mat);
 
     mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20), 0);
     mat.postRotate(SkIntToScalar(25));
@@ -54,6 +75,8 @@ void TestMatrix(skiatest::Reporter* reporter) {
     REPORTER_ASSERT(reporter, is_identity(iden1));
     iden2.setConcat(inverse, mat);
     REPORTER_ASSERT(reporter, is_identity(iden2));
+    test_flatten(reporter, mat);
+    test_flatten(reporter, iden2);
 
     // rectStaysRect test
     {