Pass accurate contentsScale to LayerImpl.

cc/contents_scaling_layer_unittest.cc

Index: cc/contents_scaling_layer_unittest.cc
diff --git a/cc/contents_scaling_layer_unittest.cc b/cc/contents_scaling_layer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4c79a90f2d729d21f86f048d4d99a3912183c650
--- /dev/null
+++ b/cc/contents_scaling_layer_unittest.cc
@@ -0,0 +1,76 @@
+// Copyright 2012 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 "config.h"
+
+#include "cc/contents_scaling_layer.h"
+
+#include "cc/test/geometry_test_utils.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using namespace cc;
+
+class MockContentsScalingLayer : public ContentsScalingLayer {
+ public:
+  MockContentsScalingLayer()
+      : ContentsScalingLayer() {
+  }
+
+  virtual void setNeedsDisplayRect(const FloatRect& dirtyRect) OVERRIDE {
+    m_lastNeedsDisplayRect = dirtyRect;
+    ContentsScalingLayer::setNeedsDisplayRect(dirtyRect);
+  }
+
+  void resetNeedsDisplay() {
+      m_needsDisplay = false;
+  }
+
+  const FloatRect& lastNeedsDisplayRect() const {
+    return m_lastNeedsDisplayRect;
+  }
+
+ private:
+  virtual ~MockContentsScalingLayer() {
+  }
+
+  FloatRect m_lastNeedsDisplayRect;
+};
+
+TEST(ContentsScalingLayerTest, checkContentsBounds) {
+  scoped_refptr<MockContentsScalingLayer> testLayer =
+      make_scoped_refptr(new MockContentsScalingLayer());
+
+  testLayer->setBounds(IntSize(320, 240));
+  EXPECT_FLOAT_EQ(1.0, testLayer->contentsScaleX());
+  EXPECT_FLOAT_EQ(1.0, testLayer->contentsScaleY());
+  EXPECT_EQ(320, testLayer->contentBounds().width());
+  EXPECT_EQ(240, testLayer->contentBounds().height());
+
+  testLayer->setContentsScale(2.0f);
+  EXPECT_EQ(640, testLayer->contentBounds().width());
+  EXPECT_EQ(480, testLayer->contentBounds().height());
+
+  testLayer->setBounds(IntSize(10, 20));
+  EXPECT_EQ(20, testLayer->contentBounds().width());
+  EXPECT_EQ(40, testLayer->contentBounds().height());
+
+  testLayer->setContentsScale(1.33f);
+  EXPECT_EQ(14, testLayer->contentBounds().width());
+  EXPECT_EQ(27, testLayer->contentBounds().height());
+}
+
+TEST(ContentsScalingLayerTest, checkContentsScaleChangeTriggersNeedsDisplay) {
+  scoped_refptr<MockContentsScalingLayer> testLayer =
+      make_scoped_refptr(new MockContentsScalingLayer());
+
+  testLayer->setBounds(IntSize(320, 240));
+
+  testLayer->resetNeedsDisplay();
+  EXPECT_FALSE(testLayer->needsDisplay());
+
+  testLayer->setContentsScale(testLayer->contentsScaleX() + 1.f);
+  EXPECT_TRUE(testLayer->needsDisplay());
+  EXPECT_FLOAT_RECT_EQ(FloatRect(0, 0, 320, 240),
+                       testLayer->lastNeedsDisplayRect());
+}