[blimp] Add SkPicture caching support.

blimp/common/compositor/blimp_picture_cache_registry_unittest.cc

Index: blimp/common/compositor/blimp_picture_cache_registry_unittest.cc
diff --git a/blimp/common/compositor/blimp_picture_cache_registry_unittest.cc b/blimp/common/compositor/blimp_picture_cache_registry_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6e4671324df55454bec4fdee96d64469b1914579
--- /dev/null
+++ b/blimp/common/compositor/blimp_picture_cache_registry_unittest.cc
@@ -0,0 +1,177 @@
+// 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/blimp_picture_cache_registry.h"
+
+#include <stdint.h>
+#include <algorithm>
+#include <unordered_set>
+#include <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blimp {
+namespace {
+
+bool Contains(std::vector<uint32_t> haystack, uint32_t needle) {

[Kevin M, 2016/06/06 23:33:58]

Your tests might benefit from EXPECT_THAT(added_, UnorderedElementsAre(z, y,
x))...

[nyquist, 2016/06/10 22:02:24]

Wow, that and EXPECT_TRUE(foo.empty()) was awesome! thanks!

+  return std::find(haystack.begin(), haystack.end(), needle) != haystack.end();
+}
+
+class BlimpPictureCacheRegistryTest : public testing::Test {
+ protected:
+  BlimpPictureCacheRegistry registry_;
+  std::vector<uint32_t> added_;
+  std::vector<uint32_t> removed_;
+};

[Kevin M, 2016/06/06 23:33:58]

DISALLOW yada

[nyquist, 2016/06/10 22:02:24]

Done.

+
+TEST_F(BlimpPictureCacheRegistryTest, SingleItemCommitFlow) {
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+
+  uint32_t item = 1;
+  registry_.IncrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(1U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item));
+  added_.clear();
+
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+
+  registry_.DecrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(1U, removed_.size());
+  EXPECT_TRUE(Contains(removed_, item));
+}
+
+TEST_F(BlimpPictureCacheRegistryTest, SingleItemMultipleTimesInSingleCommit) {
+  uint32_t item = 1;
+  registry_.IncrementRefCount(item);
+  registry_.IncrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(1U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item));
+  added_.clear();
+
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+
+  registry_.DecrementRefCount(item);
+  registry_.DecrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(1U, removed_.size());
+  EXPECT_TRUE(Contains(removed_, item));
+}
+
+TEST_F(BlimpPictureCacheRegistryTest, SingleItemMultipleTimesAcrossCommits) {
+  uint32_t item = 1;
+  registry_.IncrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(1U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item));
+  added_.clear();
+
+  registry_.IncrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+
+  registry_.DecrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+
+  registry_.DecrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(1U, removed_.size());
+  EXPECT_TRUE(Contains(removed_, item));
+}
+
+TEST_F(BlimpPictureCacheRegistryTest, SingleItemComplexInteractions) {
+  uint32_t item = 1;
+  registry_.IncrementRefCount(item);
+  registry_.DecrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+
+  registry_.IncrementRefCount(item);
+  registry_.DecrementRefCount(item);
+  registry_.IncrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(1U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item));
+  added_.clear();
+
+  registry_.DecrementRefCount(item);
+  registry_.IncrementRefCount(item);
+  registry_.DecrementRefCount(item);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(1U, removed_.size());
+  EXPECT_TRUE(Contains(removed_, item));
+}
+
+TEST_F(BlimpPictureCacheRegistryTest, MultipleItems) {
+  uint32_t item1 = 1;
+  uint32_t item2 = 2;
+  uint32_t item3 = 3;
+  registry_.IncrementRefCount(item1);
+  registry_.IncrementRefCount(item2);
+  registry_.IncrementRefCount(item3);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(3U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item1));
+  EXPECT_TRUE(Contains(added_, item2));
+  EXPECT_TRUE(Contains(added_, item3));
+  added_.clear();
+
+  registry_.DecrementRefCount(item3);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(1U, removed_.size());
+  EXPECT_TRUE(Contains(removed_, item3));
+  removed_.clear();
+
+  registry_.DecrementRefCount(item2);
+  registry_.IncrementRefCount(item3);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(1U, added_.size());
+  EXPECT_EQ(1U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item3));
+  EXPECT_TRUE(Contains(removed_, item2));
+  added_.clear();
+  removed_.clear();
+
+  registry_.IncrementRefCount(item2);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(1U, added_.size());
+  EXPECT_EQ(0U, removed_.size());
+  EXPECT_TRUE(Contains(added_, item2));
+  added_.clear();
+
+  registry_.DecrementRefCount(item1);
+  registry_.DecrementRefCount(item2);
+  registry_.DecrementRefCount(item3);
+  registry_.Commit(&added_, &removed_);
+  EXPECT_EQ(0U, added_.size());
+  EXPECT_EQ(3U, removed_.size());
+  EXPECT_TRUE(Contains(removed_, item1));
+  EXPECT_TRUE(Contains(removed_, item2));
+  EXPECT_TRUE(Contains(removed_, item3));
+}
+
+}  // namespace
+}  // namespace blimp