Use LCD text if the transform IsAlmostIdentityAndIntegerTranslation

cc/layer_tree_host_common_unittest.cc

 // Copyright 2011 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 "cc/layer_tree_host_common.h"
 
 #include "cc/content_layer.h"
 #include "cc/content_layer_client.h"
 #include "cc/heads_up_display_layer_impl.h"
 #include "cc/layer.h"
@@ skipping 5129 matching lines @@
     EXPECT_EQ(m_canUseLCDText, m_root->canUseLCDText());
     EXPECT_EQ(m_canUseLCDText, m_child->canUseLCDText());
     EXPECT_EQ(m_canUseLCDText, m_grandChild->canUseLCDText());
 }
 
 INSTANTIATE_TEST_CASE_P(LayerTreeHostCommonTest,
                         LCDTextTest,
                         testing::Combine(testing::Bool(),
                                          testing::Bool()));
 
+TEST(LayerTreeHostCommonTest, verifyRoundAlmostIntegerComponentsInTransforms)
+{
+    const float kPageScale = 0.9f;
+    const float kDeviceScale = 1.234567f;
+
+    FakeImplProxy proxy;
+    FakeLayerTreeHostImpl hostImpl(&proxy);
+
+    gfx::Transform implTransform;
+    implTransform.Scale(kPageScale, kPageScale);
+
+    gfx::Transform identityMatrix;
+    scoped_ptr<LayerImpl> layerScopedPtr = LayerImpl::create(hostImpl.activeTree(), 1);
+    LayerImpl* layer = layerScopedPtr.get();
+    layer->setContentsScale(kPageScale * kDeviceScale, kPageScale * kDeviceScale);
+    setLayerPropertiesForTesting(layer, identityMatrix, identityMatrix, gfx::Point(0, 0), gfx::PointF(0, 0), gfx::Size(500, 500), false);
+
+    scoped_ptr<LayerImpl> root = LayerImpl::create(hostImpl.activeTree(), 2);
+    root->setContentsScale(kPageScale * kDeviceScale, kPageScale * kDeviceScale);
+    root->setImplTransform(implTransform);
+    root->addChild(layerScopedPtr.Pass());
+
+    executeCalculateDrawProperties(root.get(), kDeviceScale, kPageScale, true);
+    EXPECT_TRUE(layer->drawTransform().IsIdentity());
+    EXPECT_TRUE(layer->canUseLCDText());
+    EXPECT_TRUE(root->drawTransform().IsIdentity());
+    EXPECT_TRUE(root->canUseLCDText());
+}
+
 }  // namespace
 }  // namespace cc