linux: Use scalable fonts and Fontconfig's bitmap setting.

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 148 matching lines @@
   EXPECT_TRUE(params.antialiasing);
   EXPECT_EQ(FontRenderParams::HINTING_NONE, params.hinting);
 
   style = Font::BOLD | Font::ITALIC;
   params = GetCustomFontRenderParams(
       false, NULL, NULL, NULL, &style, NULL);
   EXPECT_FALSE(params.antialiasing);
   EXPECT_EQ(FontRenderParams::HINTING_NONE, params.hinting);
 }
 
+TEST_F(FontRenderParamsTest, Scalable) {
+  ASSERT_TRUE(LoadSystemFont("arial.ttf"));
+  // Load a config that only enables antialiasing for scalable fonts.

[msw, 2014/07/21 16:06:35]

Assuming arial is scalable seems a little fragile, but it's probably fine.

+  ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
+      std::string(kFontconfigFileHeader) +
+      kFontconfigMatchHeader +
+      CreateFontconfigEditStanza("antialias", "bool", "false") +
+      kFontconfigMatchFooter +
+      kFontconfigMatchHeader +
+      CreateFontconfigTestStanza("scalable", "eq", "bool", "true") +
+      CreateFontconfigEditStanza("antialias", "bool", "true") +
+      kFontconfigMatchFooter +
+      kFontconfigFileFooter));
+
+  // Check that we specifically ask how scalable fonts should be rendered.
+  FontRenderParams params = GetCustomFontRenderParams(
+      false, NULL, NULL, NULL, NULL, 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) +
+      kFontconfigMatchHeader +
+      CreateFontconfigEditStanza("embeddedbitmap", "bool", "false") +
+      kFontconfigMatchFooter +
+      kFontconfigMatchHeader +
+      CreateFontconfigTestStanza("pixelsize", "less_eq", "double", "10") +
+      CreateFontconfigEditStanza("embeddedbitmap", "bool", "true") +
+      kFontconfigMatchFooter +
+      kFontconfigFileFooter));
+
+  FontRenderParams params = GetCustomFontRenderParams(
+      false, NULL, NULL, NULL, NULL, NULL);
+  EXPECT_FALSE(params.use_bitmaps);
+
+  const int pixel_size = 5;
+  params = GetCustomFontRenderParams(
+      false, NULL, &pixel_size, NULL, NULL, NULL);
+  EXPECT_TRUE(params.use_bitmaps);
+}
+
 }  // namespace gfx