linux: Add some font-family-related FontRenderParams tests.

BUG=396877

Review URL: https://codereview.chromium.org/415043007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285463 0039d316-1c4b-4281-b951-d872f2087c98

ui/gfx/font_render_params_linux_unittest.cc

@@ -317,4 +317,44 @@ TEST_F(FontRenderParamsTest, NoFontconfigMatch) {
   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);
+  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") +
+      kFontconfigMatchHeader +
+      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);
+  EXPECT_EQ("Verdana", suggested_family);
+
+  query.families.clear();
+  query.families.push_back("Arial");
+  suggested_family.clear();
+  GetFontRenderParams(query, &suggested_family);
+  EXPECT_EQ("Verdana", suggested_family);
+}
+
 }  // namespace gfx

ui/gfx/test/fontconfig_util_linux.cc

@@ -142,4 +142,14 @@ std::string CreateFontconfigTestStanza(const std::string& name,
       name.c_str(), op.c_str(), type.c_str(), value.c_str(), type.c_str());
 }
 
+std::string CreateFontconfigAliasStanza(const std::string& original_family,
+                                        const std::string& preferred_family) {
+  return base::StringPrintf(
+      "  <alias>\n"
+      "    <family>%s</family>\n"
+      "    <prefer><family>%s</family></prefer>\n"
+      "  </alias>\n",
+      original_family.c_str(), preferred_family.c_str());
+}
+
 }  // namespace gfx

ui/gfx/test/fontconfig_util_linux.h

@@ -54,6 +54,10 @@ std::string CreateFontconfigTestStanza(const std::string& name,
                                        const std::string& type,
                                        const std::string& value);
 
+// Returns a Fontconfig <alias> stanza.
+std::string CreateFontconfigAliasStanza(const std::string& original_family,
+                                        const std::string& preferred_family);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_TEST_FONTCONFIG_UTIL_LINUX_H_