Repaint on interest rect change

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
index 267daa88bda871bcb603522b112a99671bca5d10..1a4dfd43ba1c562c90b2c469b5c27669d89f6aaa 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
@@ -24,6 +24,11 @@ protected:
         return CompositedLayerMapping::computeInterestRect(graphicsLayer, owningLayoutObject);
     }
 
+    bool interestRectChangedEnoughToRepaint(const IntSize& layerSize, const IntRect& previousInterestRect, const IntRect& newInterestRect)
+    {
+        return CompositedLayerMapping::interestRectChangedEnoughToRepaint(layerSize, previousInterestRect, newInterestRect);
+    }
+
 private:
     void SetUp() override
     {
@@ -203,4 +208,16 @@ TEST_F(CompositedLayerMappingTest, ClippedBigLayer)
     EXPECT_TRUE(checkRectsEqual(IntRect(0, 0, 4001, 4001), computeInterestRect(paintLayer->graphicsLayerBacking(), paintLayer->layoutObject())));
 }
 
+TEST_F(CompositedLayerMappingTest, InterestRectChangedEnoughToRepaint)

[chrishtr, 2015/10/29 16:34:42]

Please copy the exact tests from here:

https://code.google.com/p/chromium/codesearch#chromium/src/cc/playback/displa...

so we know the algorithms are the same.

[Xianzhu, 2015/10/29 17:17:27]

Done.

+{
+    IntSize layerSize(2000, 2000);
+    EXPECT_FALSE(interestRectChangedEnoughToRepaint(layerSize, IntRect(), IntRect()));
+    EXPECT_TRUE(interestRectChangedEnoughToRepaint(layerSize, IntRect(), IntRect(0, 0, 100, 100)));
+    EXPECT_FALSE(interestRectChangedEnoughToRepaint(layerSize, IntRect(100, 100, 100, 100), IntRect(100, 100, 50, 50)));
+    EXPECT_FALSE(interestRectChangedEnoughToRepaint(layerSize, IntRect(100, 100, 100, 100), IntRect(50, 50, 500, 500)));
+    EXPECT_TRUE(interestRectChangedEnoughToRepaint(layerSize, IntRect(100, 100, 100, 100), IntRect(50, 50, 800, 600)));
+    EXPECT_TRUE(interestRectChangedEnoughToRepaint(layerSize, IntRect(100, 100, 100, 100), IntRect(0, 0, 200, 200)));
+    EXPECT_TRUE(interestRectChangedEnoughToRepaint(layerSize, IntRect(1000, 1000, 900, 900), IntRect(1000, 1000, 1000, 1000)));
+}
+
 } // namespace blink