Reduce the requirement for saving previousLocation

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
index f771914735ad8c3ee0384b3ae817d7ab303c9d0d..970035ccfa8e219c507df07b7b5cb23ce93b23a0 100644
--- a/third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPaintInvalidatorTest.cpp
@@ -59,6 +59,9 @@ class BoxPaintInvalidatorTest : public ::testing::WithParamInterface<bool>,
         "  .gradient {"
         "    background-image: linear-gradient(blue, yellow)"
         "  }"
+        "  .transform {"
+        "    transform: scale(2);"
+        "  }"
         "</style>"
         "<div id='target' class='border'></div>");
   }
@@ -116,64 +119,98 @@ TEST_P(BoxPaintInvalidatorTest, SubpixelVisualRectChagne) {
 
   Element* target = document().getElementById("target");
 
-  // Should do full invalidation if new geometry has subpixels.
   document().view()->setTracksPaintInvalidations(true);
   target->setAttribute(HTMLNames::styleAttr, "width: 100.6px; height: 70.3px");
   document().view()->updateAllLifecyclePhases();
   const auto* rasterInvalidations =
       &getRasterInvalidationTracking()->trackedRasterInvalidations;
   ASSERT_EQ(2u, rasterInvalidations->size());
-  EXPECT_EQ(IntRect(0, 0, 70, 140), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(IntRect(60, 0, 61, 111), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(IntRect(0, 90, 70, 50), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[1].reason);
+  document().view()->setTracksPaintInvalidations(false);
+
+  document().view()->setTracksPaintInvalidations(true);
+  target->setAttribute(HTMLNames::styleAttr, "width: 50px; height: 100px");
+  document().view()->updateAllLifecyclePhases();
+  rasterInvalidations =
+      &getRasterInvalidationTracking()->trackedRasterInvalidations;
+  ASSERT_EQ(2u, rasterInvalidations->size());
+  EXPECT_EQ(IntRect(60, 0, 61, 111), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(IntRect(0, 90, 70, 50), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[1].reason);
+  document().view()->setTracksPaintInvalidations(false);
+}
+
+TEST_P(BoxPaintInvalidatorTest, SubpixelVisualRectChangeWithTransform) {
+  ScopedSlimmingPaintInvalidationForTest scopedSlimmingPaintInvalidation(true);
+
+  Element* target = document().getElementById("target");
+  target->setAttribute(HTMLNames::classAttr, "border transform");
+  document().view()->updateAllLifecyclePhases();
+
+  document().view()->setTracksPaintInvalidations(true);
+  target->setAttribute(HTMLNames::styleAttr, "width: 100.6px; height: 70.3px");
+  document().view()->updateAllLifecyclePhases();
+  const auto* rasterInvalidations =
+      &getRasterInvalidationTracking()->trackedRasterInvalidations;
+  ASSERT_EQ(2u, rasterInvalidations->size());
+  EXPECT_EQ(IntRect(0, 0, 140, 280), (*rasterInvalidations)[0].rect);
   EXPECT_EQ(PaintInvalidationBorderBoxChange, (*rasterInvalidations)[0].reason);
-  EXPECT_EQ(IntRect(0, 0, 121, 111), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(IntRect(0, 0, 242, 222), (*rasterInvalidations)[1].rect);
   EXPECT_EQ(PaintInvalidationBorderBoxChange, (*rasterInvalidations)[1].reason);
   document().view()->setTracksPaintInvalidations(false);
 
-  // Should do full invalidation if old geometry has subpixels.
   document().view()->setTracksPaintInvalidations(true);
   target->setAttribute(HTMLNames::styleAttr, "width: 50px; height: 100px");
   document().view()->updateAllLifecyclePhases();
   rasterInvalidations =
       &getRasterInvalidationTracking()->trackedRasterInvalidations;
   ASSERT_EQ(2u, rasterInvalidations->size());
-  EXPECT_EQ(IntRect(0, 0, 121, 111), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(IntRect(0, 0, 242, 222), (*rasterInvalidations)[0].rect);
   EXPECT_EQ(PaintInvalidationBorderBoxChange, (*rasterInvalidations)[0].reason);
-  EXPECT_EQ(IntRect(0, 0, 70, 140), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(IntRect(0, 0, 140, 280), (*rasterInvalidations)[1].rect);
   EXPECT_EQ(PaintInvalidationBorderBoxChange, (*rasterInvalidations)[1].reason);
   document().view()->setTracksPaintInvalidations(false);
 }
 
-TEST_P(BoxPaintInvalidatorTest, SubpixelChangeWithoutVisualRectChange) {
+TEST_P(BoxPaintInvalidatorTest, SubpixelWithinPixelsChange) {
   ScopedSlimmingPaintInvalidationForTest scopedSlimmingPaintInvalidation(true);
 
   Element* target = document().getElementById("target");
   LayoutObject* targetObject = target->layoutObject();
   EXPECT_EQ(LayoutRect(0, 0, 70, 140), targetObject->previousVisualRect());
 
-  // Should do full invalidation if new geometry has subpixels even if the paint
-  // invalidation rect doesn't change.
   document().view()->setTracksPaintInvalidations(true);
   target->setAttribute(HTMLNames::styleAttr,
                        "margin-top: 0.6px; width: 50px; height: 99.3px");
   document().view()->updateAllLifecyclePhases();
-  EXPECT_EQ(LayoutRect(0, 0, 70, 140), targetObject->previousVisualRect());
+  EXPECT_EQ(LayoutRect(LayoutUnit(), LayoutUnit(0.6), LayoutUnit(70),
+                       LayoutUnit(139.3)),
+            targetObject->previousVisualRect());
   const auto* rasterInvalidations =
       &getRasterInvalidationTracking()->trackedRasterInvalidations;
   ASSERT_EQ(1u, rasterInvalidations->size());
   EXPECT_EQ(IntRect(0, 0, 70, 140), (*rasterInvalidations)[0].rect);
-  EXPECT_EQ(PaintInvalidationLocationChange, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(PaintInvalidationBoundsChange, (*rasterInvalidations)[0].reason);
   document().view()->setTracksPaintInvalidations(false);
 
   document().view()->setTracksPaintInvalidations(true);
   target->setAttribute(HTMLNames::styleAttr,
                        "margin-top: 0.6px; width: 49.3px; height: 98.5px");
   document().view()->updateAllLifecyclePhases();
-  EXPECT_EQ(LayoutRect(0, 0, 70, 140), targetObject->previousVisualRect());
+  EXPECT_EQ(LayoutRect(LayoutUnit(), LayoutUnit(0.6), LayoutUnit(69.3),
+                       LayoutUnit(138.5)),
+            targetObject->previousVisualRect());
   rasterInvalidations =
       &getRasterInvalidationTracking()->trackedRasterInvalidations;
-  ASSERT_EQ(1u, rasterInvalidations->size());
-  EXPECT_EQ(IntRect(0, 0, 70, 140), (*rasterInvalidations)[0].rect);
-  EXPECT_EQ(PaintInvalidationBorderBoxChange, (*rasterInvalidations)[0].reason);
+  ASSERT_EQ(2u, rasterInvalidations->size());
+  EXPECT_EQ(IntRect(59, 0, 11, 140), (*rasterInvalidations)[0].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[0].reason);
+  EXPECT_EQ(IntRect(0, 119, 70, 21), (*rasterInvalidations)[1].rect);
+  EXPECT_EQ(PaintInvalidationIncremental, (*rasterInvalidations)[1].reason);
   document().view()->setTracksPaintInvalidations(false);
 }