ui/gfx/font_render_params_linux_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gfx/font_render_params.h"
   6
   7 #include "base/files/scoped_temp_dir.h"
   8 #include "base/logging.h"
   9 #include "base/macros.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11 #include "ui/gfx/font.h"
  12 #include "ui/gfx/linux_font_delegate.h"
  13 #include "ui/gfx/test/fontconfig_util_linux.h"
  14
  15 namespace gfx {
  16
  17 namespace {
  18
  19 // Implementation of LinuxFontDelegate that returns a canned FontRenderParams
  20 // struct. This is used to isolate tests from the system's local configuration.
  21 class TestFontDelegate : public LinuxFontDelegate {
  22  public:
  23   TestFontDelegate() {}
  24   ~TestFontDelegate() override {}
  25
  26   void set_params(const FontRenderParams& params) { params_ = params; }
  27
  28   FontRenderParams GetDefaultFontRenderParams() const override {
  29     return params_;
  30   }
  31   void GetDefaultFontDescription(
  32       std::string* family_out,
  33       int* size_pixels_out,
  34       int* style_out,
  35       FontRenderParams* params_out) const override {
  36     NOTIMPLEMENTED();
  37   }
  38
  39  private:
  40   FontRenderParams params_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(TestFontDelegate);
  43 };
  44
  45 }  // namespace
  46
  47 class FontRenderParamsTest : public testing::Test {
  48  public:
  49   FontRenderParamsTest() {
  50     SetUpFontconfig();
  51     CHECK(temp_dir_.CreateUniqueTempDir());
  52     original_font_delegate_ = LinuxFontDelegate::instance();
  53     LinuxFontDelegate::SetInstance(&test_font_delegate_);
  54     ClearFontRenderParamsCacheForTest();
  55   }
  56
  57   ~FontRenderParamsTest() override {
  58     LinuxFontDelegate::SetInstance(
  59         const_cast<LinuxFontDelegate*>(original_font_delegate_));
  60     TearDownFontconfig();
  61   }
  62
  63  protected:
  64   base::ScopedTempDir temp_dir_;
  65   const LinuxFontDelegate* original_font_delegate_;
  66   TestFontDelegate test_font_delegate_;
  67
  68  private:
  69   DISALLOW_COPY_AND_ASSIGN(FontRenderParamsTest);
  70 };
  71
  72 TEST_F(FontRenderParamsTest, Default) {
  73   ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
  74   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
  75       std::string(kFontconfigFileHeader) +
  76       // Specify the desired defaults via a font match rather than a pattern
  77       // match (since this is the style generally used in /etc/fonts/conf.d).
  78       kFontconfigMatchFontHeader +
  79       CreateFontconfigEditStanza("antialias", "bool", "true") +
  80       CreateFontconfigEditStanza("autohint", "bool", "true") +
  81       CreateFontconfigEditStanza("hinting", "bool", "true") +
  82       CreateFontconfigEditStanza("hintstyle", "const", "hintslight") +
  83       CreateFontconfigEditStanza("rgba", "const", "rgb") +
  84       kFontconfigMatchFooter +
  85       // Add a font match for Arial. Since it specifies a family, it shouldn't
  86       // take effect when querying default settings.
  87       kFontconfigMatchFontHeader +
  88       CreateFontconfigTestStanza("family", "eq", "string", "Arial") +
  89       CreateFontconfigEditStanza("antialias", "bool", "true") +
  90       CreateFontconfigEditStanza("autohint", "bool", "false") +
  91       CreateFontconfigEditStanza("hinting", "bool", "true") +
  92       CreateFontconfigEditStanza("hintstyle", "const", "hintfull") +
  93       CreateFontconfigEditStanza("rgba", "const", "none") +
  94       kFontconfigMatchFooter +
  95       // Add font matches for fonts between 10 and 20 points or pixels. Since
  96       // they specify sizes, they also should not affect the defaults.
  97       kFontconfigMatchFontHeader +
  98       CreateFontconfigTestStanza("size", "more_eq", "double", "10.0") +
  99       CreateFontconfigTestStanza("size", "less_eq", "double", "20.0") +
 100       CreateFontconfigEditStanza("antialias", "bool", "false") +
 101       kFontconfigMatchFooter +
 102       kFontconfigMatchFontHeader +
 103       CreateFontconfigTestStanza("pixel_size", "more_eq", "double", "10.0") +
 104       CreateFontconfigTestStanza("pixel_size", "less_eq", "double", "20.0") +
 105       CreateFontconfigEditStanza("antialias", "bool", "false") +
 106       kFontconfigMatchFooter +
 107       kFontconfigFileFooter));
 108
 109   FontRenderParams params = GetFontRenderParams(
 110       FontRenderParamsQuery(), NULL);
 111   EXPECT_TRUE(params.antialiasing);
 112   EXPECT_TRUE(params.autohinter);
 113   EXPECT_TRUE(params.use_bitmaps);
 114   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
 115   EXPECT_FALSE(params.subpixel_positioning);
 116   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
 117             params.subpixel_rendering);
 118 }
 119
 120 TEST_F(FontRenderParamsTest, Size) {
 121   ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
 122   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 123       std::string(kFontconfigFileHeader) +
 124       kFontconfigMatchPatternHeader +
 125       CreateFontconfigEditStanza("antialias", "bool", "true") +
 126       CreateFontconfigEditStanza("hinting", "bool", "true") +
 127       CreateFontconfigEditStanza("hintstyle", "const", "hintfull") +
 128       CreateFontconfigEditStanza("rgba", "const", "none") +
 129       kFontconfigMatchFooter +
 130       kFontconfigMatchPatternHeader +
 131       CreateFontconfigTestStanza("pixelsize", "less_eq", "double", "10") +
 132       CreateFontconfigEditStanza("antialias", "bool", "false") +
 133       kFontconfigMatchFooter +
 134       kFontconfigMatchPatternHeader +
 135       CreateFontconfigTestStanza("size", "more_eq", "double", "20") +
 136       CreateFontconfigEditStanza("hintstyle", "const", "hintslight") +
 137       CreateFontconfigEditStanza("rgba", "const", "rgb") +
 138       kFontconfigMatchFooter +
 139       kFontconfigFileFooter));
 140
 141   // The defaults should be used when the supplied size isn't matched by the
 142   // second or third blocks.
 143   FontRenderParamsQuery query;
 144   query.pixel_size = 12;
 145   FontRenderParams params = GetFontRenderParams(query, NULL);
 146   EXPECT_TRUE(params.antialiasing);
 147   EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
 148   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
 149             params.subpixel_rendering);
 150
 151   query.pixel_size = 10;
 152   params = GetFontRenderParams(query, NULL);
 153   EXPECT_FALSE(params.antialiasing);
 154   EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
 155   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
 156             params.subpixel_rendering);
 157
 158   query.pixel_size = 0;
 159   query.point_size = 20;
 160   params = GetFontRenderParams(query, NULL);
 161   EXPECT_TRUE(params.antialiasing);
 162   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
 163   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
 164             params.subpixel_rendering);
 165 }
 166
 167 TEST_F(FontRenderParamsTest, Style) {
 168   ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
 169   // Load a config that disables subpixel rendering for bold text and disables
 170   // hinting for italic text.
 171   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 172       std::string(kFontconfigFileHeader) +
 173       kFontconfigMatchPatternHeader +
 174       CreateFontconfigEditStanza("antialias", "bool", "true") +
 175       CreateFontconfigEditStanza("hinting", "bool", "true") +
 176       CreateFontconfigEditStanza("hintstyle", "const", "hintslight") +
 177       CreateFontconfigEditStanza("rgba", "const", "rgb") +
 178       kFontconfigMatchFooter +
 179       kFontconfigMatchPatternHeader +
 180       CreateFontconfigTestStanza("weight", "eq", "const", "bold") +
 181       CreateFontconfigEditStanza("rgba", "const", "none") +
 182       kFontconfigMatchFooter +
 183       kFontconfigMatchPatternHeader +
 184       CreateFontconfigTestStanza("slant", "eq", "const", "italic") +
 185       CreateFontconfigEditStanza("hinting", "bool", "false") +
 186       kFontconfigMatchFooter +
 187       kFontconfigFileFooter));
 188
 189   FontRenderParamsQuery query;
 190   query.style = Font::NORMAL;
 191   FontRenderParams params = GetFontRenderParams(query, NULL);
 192   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
 193   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
 194             params.subpixel_rendering);
 195
 196   query.style = Font::BOLD;
 197   params = GetFontRenderParams(query, NULL);
 198   EXPECT_EQ(FontRenderParams::HINTING_SLIGHT, params.hinting);
 199   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
 200             params.subpixel_rendering);
 201
 202   query.style = Font::ITALIC;
 203   params = GetFontRenderParams(query, NULL);
 204   EXPECT_EQ(FontRenderParams::HINTING_NONE, params.hinting);
 205   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_RGB,
 206             params.subpixel_rendering);
 207
 208   query.style = Font::BOLD | Font::ITALIC;
 209   params = GetFontRenderParams(query, NULL);
 210   EXPECT_EQ(FontRenderParams::HINTING_NONE, params.hinting);
 211   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
 212             params.subpixel_rendering);
 213 }
 214
 215 TEST_F(FontRenderParamsTest, Scalable) {
 216   // Load a config that only enables antialiasing for scalable fonts.
 217   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 218       std::string(kFontconfigFileHeader) +
 219       kFontconfigMatchPatternHeader +
 220       CreateFontconfigEditStanza("antialias", "bool", "false") +
 221       kFontconfigMatchFooter +
 222       kFontconfigMatchPatternHeader +
 223       CreateFontconfigTestStanza("scalable", "eq", "bool", "true") +
 224       CreateFontconfigEditStanza("antialias", "bool", "true") +
 225       kFontconfigMatchFooter +
 226       kFontconfigFileFooter));
 227
 228   // Check that we specifically ask how scalable fonts should be rendered.
 229   FontRenderParams params = GetFontRenderParams(
 230       FontRenderParamsQuery(), NULL);
 231   EXPECT_TRUE(params.antialiasing);
 232 }
 233
 234 TEST_F(FontRenderParamsTest, UseBitmaps) {
 235   ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
 236   // Load a config that enables embedded bitmaps for fonts <= 10 pixels.
 237   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 238       std::string(kFontconfigFileHeader) +
 239       kFontconfigMatchPatternHeader +
 240       CreateFontconfigEditStanza("embeddedbitmap", "bool", "false") +
 241       kFontconfigMatchFooter +
 242       kFontconfigMatchPatternHeader +
 243       CreateFontconfigTestStanza("pixelsize", "less_eq", "double", "10") +
 244       CreateFontconfigEditStanza("embeddedbitmap", "bool", "true") +
 245       kFontconfigMatchFooter +
 246       kFontconfigFileFooter));
 247
 248   FontRenderParamsQuery query;
 249   FontRenderParams params = GetFontRenderParams(query, NULL);
 250   EXPECT_FALSE(params.use_bitmaps);
 251
 252   query.pixel_size = 5;
 253   params = GetFontRenderParams(query, NULL);
 254   EXPECT_TRUE(params.use_bitmaps);
 255 }
 256
 257 TEST_F(FontRenderParamsTest, ForceFullHintingWhenAntialiasingIsDisabled) {
 258   // Load a config that disables antialiasing and hinting while requesting
 259   // subpixel rendering.
 260   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 261       std::string(kFontconfigFileHeader) +
 262       kFontconfigMatchPatternHeader +
 263       CreateFontconfigEditStanza("antialias", "bool", "false") +
 264       CreateFontconfigEditStanza("hinting", "bool", "false") +
 265       CreateFontconfigEditStanza("hintstyle", "const", "hintnone") +
 266       CreateFontconfigEditStanza("rgba", "const", "rgb") +
 267       kFontconfigMatchFooter +
 268       kFontconfigFileFooter));
 269
 270   // Full hinting should be forced. See the comment in GetFontRenderParams() for
 271   // more information.
 272   FontRenderParams params = GetFontRenderParams(
 273       FontRenderParamsQuery(), NULL);
 274   EXPECT_FALSE(params.antialiasing);
 275   EXPECT_EQ(FontRenderParams::HINTING_FULL, params.hinting);
 276   EXPECT_EQ(FontRenderParams::SUBPIXEL_RENDERING_NONE,
 277             params.subpixel_rendering);
 278   EXPECT_FALSE(params.subpixel_positioning);
 279 }
 280
 281 #if defined(OS_CHROMEOS)
 282 TEST_F(FontRenderParamsTest, ForceSubpixelPositioning) {
 283   {
 284     FontRenderParams params =
 285         GetFontRenderParams(FontRenderParamsQuery(), NULL);
 286     EXPECT_TRUE(params.antialiasing);
 287     EXPECT_FALSE(params.subpixel_positioning);
 288     SetFontRenderParamsDeviceScaleFactor(1.0f);
 289   }
 290   ClearFontRenderParamsCacheForTest();
 291   SetFontRenderParamsDeviceScaleFactor(1.25f);
 292   // Subpixel positioning should be forced.
 293   {
 294     FontRenderParams params =
 295         GetFontRenderParams(FontRenderParamsQuery(), NULL);
 296     EXPECT_TRUE(params.antialiasing);
 297     EXPECT_TRUE(params.subpixel_positioning);
 298     SetFontRenderParamsDeviceScaleFactor(1.0f);
 299   }
 300 }
 301 #endif
 302
 303 TEST_F(FontRenderParamsTest, OnlySetConfiguredValues) {
 304   // Configure the LinuxFontDelegate (which queries GtkSettings on desktop
 305   // Linux) to request subpixel rendering.
 306   FontRenderParams system_params;
 307   system_params.subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_RGB;
 308   test_font_delegate_.set_params(system_params);
 309
 310   // Load a Fontconfig config that enables antialiasing but doesn't say anything
 311   // about subpixel rendering.
 312   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 313       std::string(kFontconfigFileHeader) +
 314       kFontconfigMatchPatternHeader +
 315       CreateFontconfigEditStanza("antialias", "bool", "true") +
 316       kFontconfigMatchFooter +
 317       kFontconfigFileFooter));
 318
 319   // The subpixel rendering setting from the delegate should make it through.
 320   FontRenderParams params = GetFontRenderParams(
 321       FontRenderParamsQuery(), NULL);
 322   EXPECT_EQ(system_params.subpixel_rendering, params.subpixel_rendering);
 323 }
 324
 325 TEST_F(FontRenderParamsTest, NoFontconfigMatch) {
 326   // Don't load a Fontconfig configuration.
 327   FontRenderParams system_params;
 328   system_params.antialiasing = true;
 329   system_params.hinting = FontRenderParams::HINTING_MEDIUM;
 330   system_params.subpixel_rendering = FontRenderParams::SUBPIXEL_RENDERING_RGB;
 331   test_font_delegate_.set_params(system_params);
 332
 333   FontRenderParamsQuery query;
 334   query.families.push_back("Arial");
 335   query.families.push_back("Times New Roman");
 336   query.pixel_size = 10;
 337   std::string suggested_family;
 338   FontRenderParams params = GetFontRenderParams(query, &suggested_family);
 339
 340   // The system params and the first requested family should be returned.
 341   EXPECT_EQ(system_params.antialiasing, params.antialiasing);
 342   EXPECT_EQ(system_params.hinting, params.hinting);
 343   EXPECT_EQ(system_params.subpixel_rendering, params.subpixel_rendering);
 344   EXPECT_EQ(query.families[0], suggested_family);
 345 }
 346
 347 TEST_F(FontRenderParamsTest, MissingFamily) {
 348   // With Arial and Verdana installed, request (in order) Helvetica, Arial, and
 349   // Verdana and check that Arial is returned.
 350   ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
 351   ASSERT_TRUE(LoadSystemFontIntoFontconfig("verdana.ttf"));
 352   FontRenderParamsQuery query;
 353   query.families.push_back("Helvetica");
 354   query.families.push_back("Arial");
 355   query.families.push_back("Verdana");
 356   std::string suggested_family;
 357   GetFontRenderParams(query, &suggested_family);
 358   EXPECT_EQ("Arial", suggested_family);
 359 }
 360
 361 TEST_F(FontRenderParamsTest, SubstituteFamily) {
 362   // Configure Fontconfig to use Verdana for both Helvetica and Arial.
 363   ASSERT_TRUE(LoadSystemFontIntoFontconfig("arial.ttf"));
 364   ASSERT_TRUE(LoadSystemFontIntoFontconfig("verdana.ttf"));
 365   ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
 366       std::string(kFontconfigFileHeader) +
 367       CreateFontconfigAliasStanza("Helvetica", "Verdana") +
 368       kFontconfigMatchPatternHeader +
 369       CreateFontconfigTestStanza("family", "eq", "string", "Arial") +
 370       CreateFontconfigEditStanza("family", "string", "Verdana") +
 371       kFontconfigMatchFooter +
 372       kFontconfigFileFooter));
 373
 374   FontRenderParamsQuery query;
 375   query.families.push_back("Helvetica");
 376   std::string suggested_family;
 377   GetFontRenderParams(query, &suggested_family);
 378   EXPECT_EQ("Verdana", suggested_family);
 379
 380   query.families.clear();
 381   query.families.push_back("Arial");
 382   suggested_family.clear();
 383   GetFontRenderParams(query, &suggested_family);
 384   EXPECT_EQ("Verdana", suggested_family);
 385 }
 386
 387 }  // namespace gfx