Use nearest neighbor filtering for non-translated quads

ui/gfx/transform.cc

 // Copyright (c) 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.
 
 // 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 230 matching lines @@
                                  !matrix_.getDouble(2, 0) &&
                                  !matrix_.getDouble(2, 1);
 
   bool has_no_scale = matrix_.getDouble(0, 0) == 1 &&
                       matrix_.getDouble(1, 1) == 1 &&
                       matrix_.getDouble(2, 2) == 1;
 
   return has_no_perspective && has_no_rotation_or_skew && has_no_scale;
 }
 
+bool Transform::IsIdentityOrIntegerTranslation() const {
+  if (!IsIdentityOrTranslation())
+    return false;
+
+  bool no_fractional_translation =
+      static_cast<int>(matrix_.getDouble(0, 3)) == matrix_.getDouble(0, 3) &&
+      static_cast<int>(matrix_.getDouble(1, 3)) == matrix_.getDouble(1, 3) &&
+      static_cast<int>(matrix_.getDouble(2, 3)) == matrix_.getDouble(2, 3);
+
+  return no_fractional_translation;
+}
+
 bool Transform::IsScaleOrTranslation() const {
   if (matrix_.isIdentity())
     return true;
 
   bool has_no_perspective = !matrix_.getDouble(3, 0) &&
                             !matrix_.getDouble(3, 1) &&
                             !matrix_.getDouble(3, 2) &&
                             (matrix_.getDouble(3, 3) == 1);
 
   bool has_no_rotation_or_skew = !matrix_.getDouble(0, 1) &&
@@ skipping 219 matching lines @@
     SkDoubleToMScalar(0),
     SkDoubleToMScalar(1)
   };
 
   xform.mapMScalars(p);
 
   point.SetPoint(ToRoundedInt(p[0]), ToRoundedInt(p[1]));
 }
 
 }  // namespace gfx