Don't return unsupported scales frrom GetScaleFactorFromScale()

ui/base/layout_unittest.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.
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "ui/base/layout.h"
+
+namespace ui {
+
+TEST(LayoutTest, GetScaleFactorScale) {
+  EXPECT_FLOAT_EQ(1, GetScaleFactorScale(SCALE_FACTOR_100P));
+  EXPECT_FLOAT_EQ(1.4, GetScaleFactorScale(SCALE_FACTOR_140P));
+  EXPECT_FLOAT_EQ(1.8, GetScaleFactorScale(SCALE_FACTOR_180P));
+  EXPECT_FLOAT_EQ(2, GetScaleFactorScale(SCALE_FACTOR_200P));
+}
+
+TEST(LayoutTest, GetScaleFactorFromScale) {
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(0.1));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(0.9));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(1));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetScaleFactorFromScale(1.19));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.21));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.3));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.4));
+  EXPECT_EQ(SCALE_FACTOR_140P, GetScaleFactorFromScale(1.59));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.61));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.7));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetScaleFactorFromScale(1.89));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(1.91));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(2));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(2.1));
+  EXPECT_EQ(SCALE_FACTOR_200P, GetScaleFactorFromScale(999));
+}
+
+TEST(LayoutTest, GetSupportedScaleFactorFromScale) {
+  std::vector<ScaleFactor> original_supported_factors =
+      GetSupportedScaleFactors();
+
+  std::vector<ScaleFactor> supported_factors;
+  test::SetSupportedScaleFactors(supported_factors);
+  for (float scale = 0.1; scale < 3; scale += 0.1)
+    EXPECT_EQ(SCALE_FACTOR_100P, GetSupportedScaleFactorFromScale(scale));
+
+  supported_factors.push_back(SCALE_FACTOR_100P);
+  supported_factors.push_back(SCALE_FACTOR_180P);
+  test::SetSupportedScaleFactors(supported_factors);
+  EXPECT_EQ(SCALE_FACTOR_100P, GetSupportedScaleFactorFromScale(0.1));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetSupportedScaleFactorFromScale(0.9));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetSupportedScaleFactorFromScale(1));
+  EXPECT_EQ(SCALE_FACTOR_100P, GetSupportedScaleFactorFromScale(1.39));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetSupportedScaleFactorFromScale(1.41));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetSupportedScaleFactorFromScale(1.8));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetSupportedScaleFactorFromScale(2));
+  EXPECT_EQ(SCALE_FACTOR_180P, GetSupportedScaleFactorFromScale(999));
+
+  test::SetSupportedScaleFactors(original_supported_factors);
+}
+
+}  // namespace ui