Updates subpixel positioning and hinting when DSF is changed

ui/gfx/font_render_params_linux_unittest.cc

 // Copyright 2014 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 "ui/gfx/font_render_params.h"
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 89 matching lines @@
       // default settings: http://crbug.com/421247
       kFontconfigMatchFontHeader +
       CreateFontconfigTestStanza("family", "eq", "string", "Arial") +
       CreateFontconfigEditStanza("antialias", "bool", "true") +
       CreateFontconfigEditStanza("autohint", "bool", "false") +
       CreateFontconfigEditStanza("hinting", "bool", "true") +
       CreateFontconfigEditStanza("hintstyle", "const", "hintfull") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
-  FontRenderParams params = GetFontRenderParams(
-      FontRenderParamsQuery(true), NULL);
+  FontRenderParams params =
+      GetCurrentFontRenderParams(FontRenderParamsQuery(true), NULL);
   EXPECT_TRUE(params.antialiasing);
   EXPECT_TRUE(params.autohinter);
   EXPECT_TRUE(params.use_bitmaps);
   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
   EXPECT_FALSE(params.subpixel_positioning);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
             params.subpixel_rendering);
 }
 
 TEST_F(FontRenderParamsTest, Size) {
@@ skipping 14 matching lines @@
       CreateFontconfigTestStanza("size", "more_eq", "double", "20") +
       CreateFontconfigEditStanza("hintstyle", "const", "hintslight") +
       CreateFontconfigEditStanza("rgba", "const", "rgb") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
   // The defaults should be used when the supplied size isn't matched by the
   // second or third blocks.
   FontRenderParamsQuery query(false);
   query.pixel_size = 12;
-  FontRenderParams params = GetFontRenderParams(query, NULL);
+  FontRenderParams params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_TRUE(params.antialiasing);
   EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
             params.subpixel_rendering);
 
   query.pixel_size = 10;
-  params = GetFontRenderParams(query, NULL);
+  params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_FALSE(params.antialiasing);
   EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
             params.subpixel_rendering);
 
   query.pixel_size = 0;
   query.point_size = 20;
-  params = GetFontRenderParams(query, NULL);
+  params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_TRUE(params.antialiasing);
   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
             params.subpixel_rendering);
 }
 
 TEST_F(FontRenderParamsTest, Style) {
   ASSERT_TRUE(LoadSystemFont("arial.ttf"));
   // Load a config that disables subpixel rendering for bold text and disables
   // hinting for italic text.
@@ skipping 10 matching lines @@
       CreateFontconfigEditStanza("rgba", "const", "none") +
       kFontconfigMatchFooter +
       kFontconfigMatchPatternHeader +
       CreateFontconfigTestStanza("slant", "eq", "const", "italic") +
       CreateFontconfigEditStanza("hinting", "bool", "false") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
   FontRenderParamsQuery query(false);
   query.style = Font::NORMAL;
-  FontRenderParams params = GetFontRenderParams(query, NULL);
+  FontRenderParams params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
             params.subpixel_rendering);
 
   query.style = Font::BOLD;
-  params = GetFontRenderParams(query, NULL);
+  params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
             params.subpixel_rendering);
 
   query.style = Font::ITALIC;
-  params = GetFontRenderParams(query, NULL);
+  params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_EQ(FontRenderParams::HINTING_NONE, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
             params.subpixel_rendering);
 
   query.style = Font::BOLD | Font::ITALIC;
-  params = GetFontRenderParams(query, NULL);
+  params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_EQ(FontRenderParams::HINTING_NONE, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
             params.subpixel_rendering);
 }
 
 TEST_F(FontRenderParamsTest, Scalable) {
   // Load a config that only enables antialiasing for scalable fonts.
   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
       std::string(kFontconfigFileHeader) +
       kFontconfigMatchPatternHeader +
       CreateFontconfigEditStanza("antialias", "bool", "false") +
       kFontconfigMatchFooter +
       kFontconfigMatchPatternHeader +
       CreateFontconfigTestStanza("scalable", "eq", "bool", "true") +
       CreateFontconfigEditStanza("antialias", "bool", "true") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
   // Check that we specifically ask how scalable fonts should be rendered.
-  FontRenderParams params = GetFontRenderParams(
-      FontRenderParamsQuery(false), NULL);
+  FontRenderParams params =
+      GetCurrentFontRenderParams(FontRenderParamsQuery(false), NULL);
   EXPECT_TRUE(params.antialiasing);
 }
 
 TEST_F(FontRenderParamsTest, UseBitmaps) {
   ASSERT_TRUE(LoadSystemFont("arial.ttf"));
   // Load a config that enables embedded bitmaps for fonts <= 10 pixels.
   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
       std::string(kFontconfigFileHeader) +
       kFontconfigMatchPatternHeader +
       CreateFontconfigEditStanza("embeddedbitmap", "bool", "false") +
       kFontconfigMatchFooter +
       kFontconfigMatchPatternHeader +
       CreateFontconfigTestStanza("pixelsize", "less_eq", "double", "10") +
       CreateFontconfigEditStanza("embeddedbitmap", "bool", "true") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
   FontRenderParamsQuery query(false);
-  FontRenderParams params = GetFontRenderParams(query, NULL);
+  FontRenderParams params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_FALSE(params.use_bitmaps);
 
   query.pixel_size = 5;
-  params = GetFontRenderParams(query, NULL);
+  params = GetCurrentFontRenderParams(query, NULL);
   EXPECT_TRUE(params.use_bitmaps);
 }
 
 TEST_F(FontRenderParamsTest, ForceFullHintingWhenAntialiasingIsDisabled) {
   // Load a config that disables antialiasing and hinting while requesting
   // subpixel rendering.
   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
       std::string(kFontconfigFileHeader) +
       kFontconfigMatchPatternHeader +
       CreateFontconfigEditStanza("antialias", "bool", "false") +
       CreateFontconfigEditStanza("hinting", "bool", "false") +
       CreateFontconfigEditStanza("hintstyle", "const", "hintnone") +
       CreateFontconfigEditStanza("rgba", "const", "rgb") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
-  // Full hinting should be forced. See the comment in GetFontRenderParams() for
+  // Full hinting should be forced. See the comment in
+  // GetCurrentFontRenderParams() for
   // more information.
-  FontRenderParams params = GetFontRenderParams(
-      FontRenderParamsQuery(false), NULL);
+  FontRenderParams params =
+      GetCurrentFontRenderParams(FontRenderParamsQuery(false), NULL);
   EXPECT_FALSE(params.antialiasing);
   EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
             params.subpixel_rendering);
   EXPECT_FALSE(params.subpixel_positioning);
 }
 
-#if defined(OS_CHROMEOS)
-TEST_F(FontRenderParamsTest, ForceSubpixelPositioning) {
-  {
-    FontRenderParams params =
-        GetFontRenderParams(FontRenderParamsQuery(false), NULL);
-    EXPECT_TRUE(params.antialiasing);
-    EXPECT_FALSE(params.subpixel_positioning);
-    SetFontRenderParamsDeviceScaleFactor(1.0f);
-  }
-  ClearFontRenderParamsCacheForTest();
-  SetFontRenderParamsDeviceScaleFactor(1.25f);
-  // Subpixel positioning should be forced.
-  {
-    FontRenderParams params =
-        GetFontRenderParams(FontRenderParamsQuery(false), NULL);
-    EXPECT_TRUE(params.antialiasing);
-    EXPECT_TRUE(params.subpixel_positioning);
-    SetFontRenderParamsDeviceScaleFactor(1.0f);
-  }
-}
-#endif
-
 TEST_F(FontRenderParamsTest, OnlySetConfiguredValues) {
   // Configure the LinuxFontDelegate (which queries GtkSettings on desktop
   // Linux) to request subpixel rendering.
   FontRenderParams system_params;
   system_params.subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_RGB;
   test_font_delegate_.set_params(system_params);
 
   // Load a Fontconfig config that enables antialiasing but doesn't say anything
   // about subpixel rendering.
   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
       std::string(kFontconfigFileHeader) +
       kFontconfigMatchPatternHeader +
       CreateFontconfigEditStanza("antialias", "bool", "true") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
   // The subpixel rendering setting from the delegate should make it through.
-  FontRenderParams params = GetFontRenderParams(
-      FontRenderParamsQuery(false), NULL);
+  FontRenderParams params =
+      GetCurrentFontRenderParams(FontRenderParamsQuery(false), NULL);
   EXPECT_EQ(system_params.subpixel_rendering, params.subpixel_rendering);
 }
 
 TEST_F(FontRenderParamsTest, NoFontconfigMatch) {
   // Don't load a Fontconfig configuration.
   FontRenderParams system_params;
   system_params.antialiasing = true;
   system_params.hinting = FontRenderParams::HINTING_MEDIUM;
   system_params.subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_RGB;
   test_font_delegate_.set_params(system_params);
 
   FontRenderParamsQuery query(false);
   query.families.push_back("Arial");
   query.families.push_back("Times New Roman");
   query.pixel_size = 10;
   std::string suggested_family;
-  FontRenderParams params = GetFontRenderParams(query, &suggested_family);
+  FontRenderParams params =
+      GetCurrentFontRenderParams(query, &suggested_family);
 
   // The system params and the first requested family should be returned.
   EXPECT_EQ(system_params.antialiasing, params.antialiasing);
   EXPECT_EQ(system_params.hinting, params.hinting);
   EXPECT_EQ(system_params.subpixel_rendering, params.subpixel_rendering);
   EXPECT_EQ(query.families[0], suggested_family);
 }
 
 TEST_F(FontRenderParamsTest, MissingFamily) {
   // With Arial and Verdana installed, request (in order) Helvetica, Arial, and
   // Verdana and check that Arial is returned.
   ASSERT_TRUE(LoadSystemFont("arial.ttf"));
   ASSERT_TRUE(LoadSystemFont("verdana.ttf"));
   FontRenderParamsQuery query(false);
   query.families.push_back("Helvetica");
   query.families.push_back("Arial");
   query.families.push_back("Verdana");
   std::string suggested_family;
-  GetFontRenderParams(query, &suggested_family);
+  GetCurrentFontRenderParams(query, &suggested_family);
   EXPECT_EQ("Arial", suggested_family);
 }
 
 TEST_F(FontRenderParamsTest, SubstituteFamily) {
   // Configure Fontconfig to use Verdana for both Helvetica and Arial.
   ASSERT_TRUE(LoadSystemFont("arial.ttf"));
   ASSERT_TRUE(LoadSystemFont("verdana.ttf"));
   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
       std::string(kFontconfigFileHeader) +
       CreateFontconfigAliasStanza("Helvetica", "Verdana") +
       kFontconfigMatchPatternHeader +
       CreateFontconfigTestStanza("family", "eq", "string", "Arial") +
       CreateFontconfigEditStanza("family", "string", "Verdana") +
       kFontconfigMatchFooter +
       kFontconfigFileFooter));
 
   FontRenderParamsQuery query(false);
   query.families.push_back("Helvetica");
   std::string suggested_family;
-  GetFontRenderParams(query, &suggested_family);
+  GetCurrentFontRenderParams(query, &suggested_family);
   EXPECT_EQ("Verdana", suggested_family);
 
   query.families.clear();
   query.families.push_back("Arial");
   suggested_family.clear();
-  GetFontRenderParams(query, &suggested_family);
+  GetCurrentFontRenderParams(query, &suggested_family);
   EXPECT_EQ("Verdana", suggested_family);
 }
 
 }  // namespace gfx