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

ui/gfx/font_render_params_linux_unittest.cc

Index: ui/gfx/font_render_params_linux_unittest.cc
diff --git a/ui/gfx/font_render_params_linux_unittest.cc b/ui/gfx/font_render_params_linux_unittest.cc
index 1a9167f069666a70ae94c09fb69246e3e68abfba..6d28119206e450446c3931a9fb1e412f397e21c6 100644
--- a/ui/gfx/font_render_params_linux_unittest.cc
+++ b/ui/gfx/font_render_params_linux_unittest.cc
@@ -166,4 +166,48 @@ TEST_F(FontRenderParamsTest, Style) {
   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