Use nearest neighbor filtering for non-translated quads

ui/gfx/transform_unittest.cc

 // Copyright (c) 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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "ui/gfx/transform.h"
 
 #include <cmath>
@@ skipping 1140 matching lines @@
     while (rotation < 0.0)
       rotation += 360.0;
     while (rotation > 360.0)
       rotation -= 360.0;
     EXPECT_FLOAT_EQ(rotation, degrees);
     EXPECT_FLOAT_EQ(decomp.scale[0], degrees + 1);
     EXPECT_FLOAT_EQ(decomp.scale[1], 2 * degrees + 1);
   }
 }
 
+TEST(XFormTest, IntegerTranslation) {
+  gfx::Transform transform;
+  EXPECT_TRUE(transform.IsIdentityOrIntegerTranslation());
+
+  transform.Translate3d(1, 2, 3);
+  EXPECT_TRUE(transform.IsIdentityOrIntegerTranslation());
+
+  transform.MakeIdentity();
+  transform.Translate3d(-1, -2, -3);
+  EXPECT_TRUE(transform.IsIdentityOrIntegerTranslation());
+
+  transform.MakeIdentity();
+  transform.Translate3d(4.5, 0, 0);
+  EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
+
+  transform.MakeIdentity();
+  transform.Translate3d(0, -6.7, 0);
+  EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
+
+  transform.MakeIdentity();
+  transform.Translate3d(0, 0, 8.9);
+  EXPECT_FALSE(transform.IsIdentityOrIntegerTranslation());
+}
+
+
 }  // namespace
 
 }  // namespace gfx