Simplify incremental paint invalidation

third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp

Index: third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp b/third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5ca96c3a91014da157a6d65b4f622a5f37ea024c
--- /dev/null
+++ b/third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp
@@ -0,0 +1,89 @@
+// 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 "core/HTMLNames.h"
+#include "core/frame/FrameView.h"
+#include "core/layout/LayoutTestHelper.h"
+#include "core/layout/LayoutView.h"
+#include "core/paint/PaintLayer.h"
+#include "platform/graphics/GraphicsLayer.h"
+#include "platform/graphics/paint/RasterInvalidationTracking.h"
+
+namespace blink {
+
+class BoxPaintInvalidatorTest : public RenderingTest {
+ protected:
+  const RasterInvalidationTracking* getRasterInvalidationTracking() const {
+    // TODO(wangxianzhu): Test SPv2.
+    return layoutView()
+        .layer()
+        ->graphicsLayerBacking()
+        ->getRasterInvalidationTracking();
+  }
+
+ private:
+  void SetUp() override {
+    RenderingTest::SetUp();
+    enableCompositing();
+    setBodyInnerHTML(
+        "<style>"
+        "  body { margin: 0 }"
+        "  #target {"
+        "    width: 50px;"
+        "    height: 100px;"
+        "    border-width: 20px 10px;"
+        "    border-style: solid;"
+        "    border-color: red;"
+        "  }"
+        "</style>"
+        "<div id='target'></div>");
+  }
+};
+
+TEST_F(BoxPaintInvalidatorTest, IncrementalInvalidationExpand) {
+  document().view()->setTracksPaintInvalidations(true);
+  Element* target = document().getElementById("target");
+  target->setAttribute(HTMLNames::styleAttr, "width: 100px; height: 200px");
+  document().view()->updateAllLifecyclePhases();
+  const auto* rasterInvalidations =
+      &getRasterInvalidationTracking()->trackedRasterInvalidations;
+  EXPECT_EQ(2u, rasterInvalidations->size());
+  EXPECT_EQ(IntRect(60, 0, 60, 240), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(IntRect(0, 120, 120, 120), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[1].reason);
+  document().view()->setTracksPaintInvalidations(false);
+}
+
+TEST_F(BoxPaintInvalidatorTest, IncrementalInvalidationShrink) {
+  document().view()->setTracksPaintInvalidations(true);
+  Element* target = document().getElementById("target");
+  target->setAttribute(HTMLNames::styleAttr, "width: 20px; height: 80px");
+  document().view()->updateAllLifecyclePhases();
+  const auto* rasterInvalidations =
+      &getRasterInvalidationTracking()->trackedRasterInvalidations;
+  EXPECT_EQ(2u, rasterInvalidations->size());
+  EXPECT_EQ(IntRect(30, 0, 40, 140), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(IntRect(0, 100, 70, 40), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[1].reason);
+  document().view()->setTracksPaintInvalidations(false);
+}
+
+TEST_F(BoxPaintInvalidatorTest, IncrementalInvalidationMixed) {
+  document().view()->setTracksPaintInvalidations(true);
+  Element* target = document().getElementById("target");
+  target->setAttribute(HTMLNames::styleAttr, "width: 100px; height: 80px");
+  document().view()->updateAllLifecyclePhases();
+  const auto* rasterInvalidations =
+      &getRasterInvalidationTracking()->trackedRasterInvalidations;
+  EXPECT_EQ(2u, rasterInvalidations->size());
+  EXPECT_EQ(IntRect(60, 0, 60, 120), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(IntRect(0, 100, 70, 40), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[1].reason);
+  document().view()->setTracksPaintInvalidations(false);
+}
+
+}  // namespace blink