PaintChunk::id

third_party/WebKit/Source/platform/graphics/paint/PaintChunkTest.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/PaintChunkTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PaintChunkTest.cpp b/third_party/WebKit/Source/platform/graphics/paint/PaintChunkTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d0109ab41557acda6671860b1618a040e2272375
--- /dev/null
+++ b/third_party/WebKit/Source/platform/graphics/paint/PaintChunkTest.cpp
@@ -0,0 +1,80 @@
+// 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 "platform/graphics/paint/PaintChunk.h"
+
+#include "platform/RuntimeEnabledFeatures.h"
+#include "platform/testing/FakeDisplayItemClient.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/Optional.h"
+
+namespace blink {
+
+TEST(PaintChunkTest, IdMatchesSame)
+{
+    PaintChunkProperties properties;
+    FakeDisplayItemClient client;
+    client.updateCacheGeneration();
+    DisplayItem::Id id(client, DisplayItem::DrawingFirst);
+    EXPECT_TRUE(PaintChunk(0, 1, &id, properties).idMatches(PaintChunk(0, 1, &id, properties)));
+}
+
+TEST(PaintChunkTest, IdMatchesEqual)
+{
+    PaintChunkProperties properties;
+    FakeDisplayItemClient client;
+    client.updateCacheGeneration();
+    DisplayItem::Id id(client, DisplayItem::DrawingFirst);
+    DisplayItem::Id idEqual = id;
+    EXPECT_TRUE(PaintChunk(0, 1, &id, properties).idMatches(PaintChunk(0, 1, &idEqual, properties)));
+    EXPECT_TRUE(PaintChunk(0, 1, &idEqual, properties).idMatches(PaintChunk(0, 1, &id, properties)));
+}
+
+TEST(PaintChunkTest, IdNotMatches)
+{
+    PaintChunkProperties properties;
+    FakeDisplayItemClient client1;
+    client1.updateCacheGeneration();
+    DisplayItem::Id id1a(client1, DisplayItem::DrawingFirst);
+    DisplayItem::Id id1b(client1, DisplayItem::Subsequence);
+    EXPECT_FALSE(PaintChunk(0, 1, &id1a, properties).idMatches(PaintChunk(0, 1, &id1b, properties)));
+    EXPECT_FALSE(PaintChunk(0, 1, &id1b, properties).idMatches(PaintChunk(0, 1, &id1a, properties)));
+
+    FakeDisplayItemClient client2;
+    client2.updateCacheGeneration();
+    DisplayItem::Id id2(client2, DisplayItem::DrawingFirst);
+    EXPECT_FALSE(PaintChunk(0, 1, &id1a, properties).idMatches(PaintChunk(0, 1, &id2, properties)));
+    EXPECT_FALSE(PaintChunk(0, 1, &id2, properties).idMatches(PaintChunk(0, 1, &id1a, properties)));
+}
+
+TEST(PaintChunkTest, IdNotMatchesNull)
+{
+    PaintChunkProperties properties;
+    FakeDisplayItemClient client;
+    client.updateCacheGeneration();
+    DisplayItem::Id id(client, DisplayItem::DrawingFirst);
+    EXPECT_FALSE(PaintChunk(0, 1, nullptr, properties).idMatches(PaintChunk(0, 1, &id, properties)));
+    EXPECT_FALSE(PaintChunk(0, 1, &id, properties).idMatches(PaintChunk(0, 1, nullptr, properties)));
+    EXPECT_FALSE(PaintChunk(0, 1, nullptr, properties).idMatches(PaintChunk(0, 1, nullptr, properties)));
+}
+
+TEST(PaintChunkTest, IdNotMatchesJustCreated)
+{
+    PaintChunkProperties properties;
+    Optional<FakeDisplayItemClient> client;
+    client.emplace();
+    DisplayItem::Id id(*client, DisplayItem::DrawingFirst);
+    // A chunk of a newly create client doesn't match any chunk because it's never cached.
+    EXPECT_FALSE(PaintChunk(0, 1, &id, properties).idMatches(PaintChunk(0, 1, &id, properties)));
+
+    client->updateCacheGeneration();
+    EXPECT_TRUE(PaintChunk(0, 1, &id, properties).idMatches(PaintChunk(0, 1, &id, properties)));
+
+    // Delete the current object and create a new object is created at the same address.
+    client = WTF::nullopt;
+    client.emplace();
+    EXPECT_FALSE(PaintChunk(0, 1, &id, properties).idMatches(PaintChunk(0, 1, &id, properties)));
+}
+
+} // namespace blink