Add skia extension to allow setting default fontmgr on linux. Use it to allow the linux blimp clien…

blimp/client/app/linux/blimp_main.cc

 // Copyright 2016 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 <string>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "blimp/client/app/blimp_startup.h"
 #include "blimp/client/app/linux/blimp_client_context_delegate_linux.h"
 #include "blimp/client/app/linux/blimp_display_manager.h"
 #include "blimp/client/app/linux/blimp_display_manager_delegate_main.h"
 #include "blimp/client/core/settings/settings_prefs.h"
+#include "blimp/client/core/switches/blimp_client_switches.h"
 #include "blimp/client/public/blimp_client_context.h"
 #include "blimp/client/public/contents/blimp_navigation_controller.h"
 #include "blimp/client/support/compositor/compositor_dependencies_impl.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/command_line_pref_store.h"
 #include "components/prefs/in_memory_pref_store.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/pref_service_factory.h"
+#include "skia/ext/fontmgr_default_linux.h"
+#include "third_party/skia/include/ports/SkFontConfigInterface.h"
+#include "third_party/skia/include/ports/SkFontMgr.h"
+#include "third_party/skia/include/ports/SkFontMgr_android.h"
 #include "ui/gfx/x/x11_connection.h"
 
 namespace {
 const char kDefaultUrl[] = "https://www.google.com";
 constexpr int kWindowWidth = 800;
 constexpr int kWindowHeight = 600;
 
 class BlimpShellCommandLinePrefStore : public CommandLinePrefStore {
  public:
   explicit BlimpShellCommandLinePrefStore(const base::CommandLine* command_line)
       : CommandLinePrefStore(command_line) {
     blimp::client::BlimpClientContext::ApplyBlimpSwitches(this);
   }
 
  protected:
   ~BlimpShellCommandLinePrefStore() override = default;
 };
+
+bool HasAndroidFontSwitch() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      blimp::switches::kAndroidFontsPath);
+}
+
+std::string GetAndroidFontsDirectory() {
+  std::string android_fonts_dir =
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          blimp::switches::kAndroidFontsPath);
+  if (android_fonts_dir.size() > 0 && android_fonts_dir.back() != '/') {
+    android_fonts_dir += '/';
+  }
+  return android_fonts_dir;
+}
+
+SkFontMgr* CreateAndroidFontMgr(std::string android_fonts_dir) {
+  SkFontMgr_Android_CustomFonts custom;
+  custom.fSystemFontUse =
+      SkFontMgr_Android_CustomFonts::SystemFontUse::kOnlyCustom;
+  custom.fBasePath = android_fonts_dir.c_str();
+
+  std::string font_config;
+  std::string fallback_font_config;
+  if (android_fonts_dir.find("kitkat") != std::string::npos) {
+    font_config = android_fonts_dir + "system_fonts.xml";
+    fallback_font_config = android_fonts_dir + "fallback_fonts.xml";
+    custom.fFallbackFontsXml = fallback_font_config.c_str();
+  } else {
+    font_config = android_fonts_dir + "fonts.xml";
+    custom.fFallbackFontsXml = nullptr;
+  }
+  custom.fFontsXml = font_config.c_str();
+  custom.fIsolated = true;
+
+  return SkFontMgr_New_Android(&custom);
+}
+
+void SetupAndroidFontManager() {
+  if (HasAndroidFontSwitch()) {
+    SetDefaultSkiaFactory(CreateAndroidFontMgr(GetAndroidFontsDirectory()));
+  }
+}
 }  // namespace
 
 int main(int argc, const char**argv) {
   base::AtExitManager at_exit;
   base::CommandLine::Init(argc, argv);
+  SetupAndroidFontManager();
 
   CHECK(gfx::InitializeThreadedX11());
 
   blimp::client::InitializeLogging();
   blimp::client::InitializeMainMessageLoop();
   blimp::client::InitializeResourceBundle();
 
   base::Thread io_thread("BlimpIOThread");
   base::Thread::Options options;
   options.message_loop_type = base::MessageLoop::TYPE_IO;
@@ skipping 46 matching lines @@
   std::unique_ptr<blimp::client::BlimpDisplayManagerDelegate>
       display_manager_delegate =
           base::MakeUnique<blimp::client::BlimpDisplayManagerDelegateMain>();
   blimp::client::BlimpDisplayManager display_manager(
       display_manager_delegate.get(), compositor_dependencies);
   display_manager.SetWindowSize(gfx::Size(kWindowWidth, kWindowHeight));
   display_manager.SetBlimpContents(std::move(contents));
 
   base::RunLoop().Run();
 }