[blimp] Add SkPicture caching support.

blimp/common/compositor/reference_tracker_unittest.cc

Index: blimp/common/compositor/reference_tracker_unittest.cc
diff --git a/blimp/common/compositor/reference_tracker_unittest.cc b/blimp/common/compositor/reference_tracker_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..21a9e90674a901f3d9f8acc7902d3d31db5636ff
--- /dev/null
+++ b/blimp/common/compositor/reference_tracker_unittest.cc
@@ -0,0 +1,199 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "blimp/common/compositor/reference_tracker.h"
+
+#include <stdint.h>
+#include <algorithm>
+#include <unordered_set>
+#include <vector>
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blimp {
+namespace {
+
+class ReferenceTrackerTest : public testing::Test {
+ public:
+  ReferenceTrackerTest() = default;
+  ~ReferenceTrackerTest() override = default;
+
+ protected:
+  ReferenceTracker tracker_;
+  std::vector<uint32_t> added_;
+  std::vector<uint32_t> removed_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ReferenceTrackerTest);
+};
+
+TEST_F(ReferenceTrackerTest, SingleItemCommitFlow) {
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  uint32_t item = 1;
+  tracker_.IncrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  tracker_.DecrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item));
+}
+
+TEST_F(ReferenceTrackerTest, SingleItemMultipleTimesInSingleCommit) {
+  uint32_t item = 1;
+  tracker_.IncrementRefCount(item);
+  tracker_.IncrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  tracker_.DecrementRefCount(item);
+  tracker_.DecrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item));
+}
+
+TEST_F(ReferenceTrackerTest, SingleItemMultipleTimesAcrossCommits) {
+  uint32_t item = 1;
+  tracker_.IncrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.IncrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  tracker_.DecrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  tracker_.DecrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item));
+}
+
+TEST_F(ReferenceTrackerTest, SingleItemComplexInteractions) {
+  uint32_t item = 1;
+  tracker_.IncrementRefCount(item);
+  tracker_.DecrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  tracker_.IncrementRefCount(item);
+  tracker_.DecrementRefCount(item);
+  tracker_.IncrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.DecrementRefCount(item);
+  tracker_.IncrementRefCount(item);
+  tracker_.DecrementRefCount(item);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item));
+}
+
+TEST_F(ReferenceTrackerTest, MultipleItems) {
+  uint32_t item1 = 1;
+  uint32_t item2 = 2;
+  uint32_t item3 = 3;
+  tracker_.IncrementRefCount(item1);
+  tracker_.IncrementRefCount(item2);
+  tracker_.IncrementRefCount(item3);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item1, item2, item3));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.DecrementRefCount(item3);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item3));
+  removed_.clear();
+
+  tracker_.DecrementRefCount(item2);
+  tracker_.IncrementRefCount(item3);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item3));
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item2));
+  added_.clear();
+  removed_.clear();
+
+  tracker_.IncrementRefCount(item2);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item2));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.DecrementRefCount(item1);
+  tracker_.DecrementRefCount(item2);
+  tracker_.DecrementRefCount(item3);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item1, item2, item3));
+}
+
+TEST_F(ReferenceTrackerTest, MultipleItemsWithClear) {
+  uint32_t item1 = 1;
+  uint32_t item2 = 2;
+  tracker_.IncrementRefCount(item1);
+  tracker_.IncrementRefCount(item2);
+  tracker_.ClearRefCounts();
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_TRUE(added_.empty());
+  EXPECT_TRUE(removed_.empty());
+
+  tracker_.IncrementRefCount(item1);
+  tracker_.IncrementRefCount(item2);
+  tracker_.ClearRefCounts();
+  tracker_.IncrementRefCount(item1);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item1));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+
+  tracker_.ClearRefCounts();
+  tracker_.IncrementRefCount(item2);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item2));
+  EXPECT_THAT(removed_, testing::UnorderedElementsAre(item1));
+  added_.clear();
+  removed_.clear();
+
+  tracker_.ClearRefCounts();
+  tracker_.IncrementRefCount(item1);
+  tracker_.IncrementRefCount(item2);
+  tracker_.CommitRefCounts(&added_, &removed_);
+  EXPECT_THAT(added_, testing::UnorderedElementsAre(item1));
+  EXPECT_TRUE(removed_.empty());
+  added_.clear();
+}
+
+}  // namespace
+}  // namespace blimp