linux: Add tests for FontRenderParams on Linux.

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"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/test/fontconfig_util_linux.h"
+
+namespace gfx {
+
+namespace {
+
+// Loads the first system font defined by fontconfig_util_linux.h with a base
+// filename of |basename|. Case is ignored.
+bool LoadSystemFont(const std::string& basename) {
+  for (size_t i = 0; i < kNumSystemFontsForFontconfig; ++i) {
+    base::FilePath path(gfx::kSystemFontsForFontconfig[i]);
+    if (strcasecmp(path.BaseName().value().c_str(), basename.c_str()) == 0)
+      return LoadFontIntoFontconfig(path);
+  }
+  LOG(ERROR) << "Unable to find system font named " << basename;
+  return false;
+}
+
+}  // namespace
+
+class FontRenderParamsTest : public testing::Test {
+ public:
+  FontRenderParamsTest() {
+    SetUpFontconfig();
+    CHECK(temp_dir_.CreateUniqueTempDir());
+  }
+
+  virtual ~FontRenderParamsTest() {
+    TearDownFontconfig();
+  }
+
+ protected:
+  base::ScopedTempDir temp_dir_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FontRenderParamsTest);
+};
+
+TEST_F(FontRenderParamsTest, Default) {
+  // Fontconfig needs to know about at least one font to return a match.
+  ASSERT_TRUE(LoadSystemFont("arial.ttf"));
+  ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
+      std::string(kFontconfigFileHeader) +
+      kFontconfigMatchHeader +
+      CreateFontconfigEditStanza("antialias", "bool", "true") +
+      CreateFontconfigEditStanza("autohint", "bool", "false") +
+      CreateFontconfigEditStanza("hinting", "bool", "true") +
+      CreateFontconfigEditStanza("hintstyle", "const", "hintfull") +
+      CreateFontconfigEditStanza("rgba", "const", "rgb") +
+      kFontconfigMatchFooter +
+      kFontconfigFileFooter));
+
+  FontRenderParams params = GetDefaultFontRenderParams();
+#if defined(OS_CHROMEOS)
+  // Chrome OS uses its own defaults for everything except subpixel rendering,
+  // which comes from Fontconfig.
+  EXPECT_TRUE(params.antialiasing);
+  EXPECT_TRUE(params.autohinter);
+  EXPECT_TRUE(params.use_bitmaps);
+  EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
+#else
+  // Desktop Linux gets all settings from fontconfig.
+  EXPECT_TRUE(params.antialiasing);
+  EXPECT_FALSE(params.autohinter);
+  EXPECT_TRUE(params.use_bitmaps);
+  EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
+#endif
+  EXPECT_FALSE(params.subpixel_positioning);
+  EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
+            params.subpixel_rendering);
+}
+
+// Chrome OS ignores most Fontconfig settings.
+#if !defined(OS_CHROMEOS)
+TEST_F(FontRenderParamsTest, Size) {
+  // Fontconfig needs to know about at least one font to return a match.
+  ASSERT_TRUE(LoadSystemFont("arial.ttf"));
+  ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
+      std::string(kFontconfigFileHeader) +
+      kFontconfigMatchHeader +
+      CreateFontconfigEditStanza("antialias", "bool", "true") +
+      CreateFontconfigEditStanza("hinting", "bool", "true") +
+      CreateFontconfigEditStanza("hintstyle", "const", "hintfull") +
+      CreateFontconfigEditStanza("rgba", "const", "none") +
+      kFontconfigMatchFooter +
+      kFontconfigMatchHeader +
+      CreateFontconfigTestStanza("pixelsize", "less_eq", "double", "10") +
+      CreateFontconfigEditStanza("antialias", "bool", "false") +
+      kFontconfigMatchFooter +
+      kFontconfigMatchHeader +
+      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.
+  int pixel_size = 12;
+  FontRenderParams params = GetCustomFontRenderParams(
+      false, NULL, &pixel_size, NULL, NULL);
+  EXPECT_TRUE(params.antialiasing);
+  EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
+  EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
+            params.subpixel_rendering);
+
+  pixel_size = 10;
+  params = GetCustomFontRenderParams(false, NULL, &pixel_size, NULL, NULL);
+  EXPECT_FALSE(params.antialiasing);
+  EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
+  EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
+            params.subpixel_rendering);
+
+  int point_size = 20;
+  params = GetCustomFontRenderParams(false, NULL, NULL, &point_size, NULL);
+  EXPECT_TRUE(params.antialiasing);
+  EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
+  EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
+            params.subpixel_rendering);
+}
+#endif  // !defined(OS_CHROMEOS)
+
+}  // namespace gfx