Updates subpixel positioning and hinting when DSF is changed

ash/display/display_manager_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 "ash/display/display_manager.h"
 
 #include "ash/ash_switches.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_layout_store.h"
@@ skipping 1579 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(FontTestHelper);
 };
 
 
 bool IsTextSubpixelPositioningEnabled() {
   gfx::FontRenderParams params =
       gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(false), NULL);
   return params.subpixel_positioning;
 }
 
+gfx::FontRenderParams::Hinting GetFontHintingParams() {
+  gfx::FontRenderParams params =
+      gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(false), NULL);
+  return params.hinting;
+}
+
 }  // namespace
 
 typedef testing::Test DisplayManagerFontTest;
 
 TEST_F(DisplayManagerFontTest, TextSubpixelPositioningWithDsf100Internal) {
   FontTestHelper helper(1.0f, FontTestHelper::INTERNAL);
   ASSERT_DOUBLE_EQ(
       1.0f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_FALSE(IsTextSubpixelPositioningEnabled());
+  EXPECT_NE(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
 }
 
 TEST_F(DisplayManagerFontTest, TextSubpixelPositioningWithDsf125Internal) {
   FontTestHelper helper(1.25f, FontTestHelper::INTERNAL);
   ASSERT_DOUBLE_EQ(
       1.25f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_TRUE(IsTextSubpixelPositioningEnabled());
+  EXPECT_EQ(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
 }
 
 TEST_F(DisplayManagerFontTest, TextSubpixelPositioningWithDsf200Internal) {
   FontTestHelper helper(2.0f, FontTestHelper::INTERNAL);
   ASSERT_DOUBLE_EQ(
       2.0f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_TRUE(IsTextSubpixelPositioningEnabled());
+  EXPECT_EQ(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
+
+  Shell::GetInstance()->display_manager()->SetDisplayUIScale(
+      Shell::GetScreen()->GetPrimaryDisplay().id(), 2.0f);
+
+  ASSERT_DOUBLE_EQ(
+      1.0f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
+  EXPECT_FALSE(IsTextSubpixelPositioningEnabled());
+  EXPECT_NE(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
 }
 
 TEST_F(DisplayManagerFontTest, TextSubpixelPositioningWithDsf100External) {
   FontTestHelper helper(1.0f, FontTestHelper::EXTERNAL);
   ASSERT_DOUBLE_EQ(
       1.0f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_FALSE(IsTextSubpixelPositioningEnabled());
+  EXPECT_NE(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
 }
 
 TEST_F(DisplayManagerFontTest, TextSubpixelPositioningWithDsf125External) {
   FontTestHelper helper(1.25f, FontTestHelper::EXTERNAL);
   ASSERT_DOUBLE_EQ(
       1.25f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_FALSE(IsTextSubpixelPositioningEnabled());
+  EXPECT_NE(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
 }
 
 TEST_F(DisplayManagerFontTest, TextSubpixelPositioningWithDsf200External) {
   FontTestHelper helper(2.0f, FontTestHelper::EXTERNAL);
   ASSERT_DOUBLE_EQ(
       2.0f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_FALSE(IsTextSubpixelPositioningEnabled());
+  EXPECT_NE(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
 }
 
 TEST_F(DisplayManagerFontTest,
        TextSubpixelPositioningWithDsf125InternalWithScaling) {
   DisplayInfo::SetUse125DSFForUIScaling(true);
   FontTestHelper helper(1.25f, FontTestHelper::INTERNAL);
   ASSERT_DOUBLE_EQ(
       1.0f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
   EXPECT_FALSE(IsTextSubpixelPositioningEnabled());
+  EXPECT_NE(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
+
+  Shell::GetInstance()->display_manager()->SetDisplayUIScale(
+      Shell::GetScreen()->GetPrimaryDisplay().id(), 0.8f);
+
+  ASSERT_DOUBLE_EQ(
+      1.25f, Shell::GetScreen()->GetPrimaryDisplay().device_scale_factor());
+  EXPECT_TRUE(IsTextSubpixelPositioningEnabled());
+  EXPECT_EQ(gfx::FontRenderParams::HINTING_NONE, GetFontHintingParams());
+
   DisplayInfo::SetUse125DSFForUIScaling(false);
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash