Sandbox html_viewer on Linux.

components/font_service/public/cpp/font_service_thread.cc

+// Copyright 2015 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 "components/font_service/public/cpp/font_service_thread.h"
+
+#include "base/bind.h"
+#include "base/files/file.h"
+#include "base/synchronization/waitable_event.h"
+#include "components/font_service/public/cpp/mapped_font_file.h"
+#include "mojo/message_pump/message_pump_mojo.h"
+#include "mojo/platform_handle/platform_handle_functions.h"
+
+namespace font_service {
+namespace internal {
+
+namespace {
+const char kFontThreadName[] = "Font_Proxy_Thread";
+}  // namespace
+
+FontServiceThread::FontServiceThread(FontServicePtr font_service)
+    : base::Thread(kFontThreadName),
+      font_service_info_(font_service.PassInterface().Pass()) {
+  base::Thread::Options options;
+  options.message_pump_factory =
+      base::Bind(&mojo::common::MessagePumpMojo::Create);
+  StartWithOptions(options);
+}
+
+bool FontServiceThread::MatchFamilyName(
+    const char family_name[],
+    SkTypeface::Style requested_style,
+    SkFontConfigInterface::FontIdentity* out_font_identity,
+    SkString* out_family_name,
+    SkTypeface::Style* out_style) {
+  DCHECK_NE(GetThreadId(), base::PlatformThread::CurrentId());
+
+  bool out_valid = false;
+  // This proxies to the other thread, which proxies to mojo. Only on the reply
+  // from mojo do we return from this.
+  base::WaitableEvent done_event(false, false);
+  task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&FontServiceThread::MatchFamilyNameImpl, this, &done_event,
+                 family_name, requested_style, &out_valid, out_font_identity,
+                 out_family_name, out_style));
+  done_event.Wait();
+
+  return out_valid;
+}
+
+scoped_refptr<MappedFontFile> FontServiceThread::OpenStream(
+    const SkFontConfigInterface::FontIdentity& identity) {
+  DCHECK_NE(GetThreadId(), base::PlatformThread::CurrentId());
+
+  base::File stream_file;
+  // This proxies to the other thread, which proxies to mojo. Only on the reply
+  // from mojo do we return from this.
+  base::WaitableEvent done_event(false, false);
+  task_runner()->PostTask(FROM_HERE,
+                          base::Bind(&FontServiceThread::OpenStreamImpl, this,
+                                     &done_event, &stream_file, identity.fID));
+  done_event.Wait();
+
+  if (!stream_file.IsValid()) {
+    NOTREACHED();
+    return nullptr;
+  }
+
+  // Converts the file to out internal type.
+  scoped_refptr<MappedFontFile> mapped_font_file =
+      new MappedFontFile(identity.fID);
+  if (!mapped_font_file->Initialize(stream_file.Pass()))
+    return nullptr;
+
+  return mapped_font_file;
+}
+
+FontServiceThread::~FontServiceThread() {
+  Stop();
+}
+
+void FontServiceThread::MatchFamilyNameImpl(
+    base::WaitableEvent* done_event,
+    const char family_name[],
+    SkTypeface::Style requested_style,
+    bool* out_valid,
+    SkFontConfigInterface::FontIdentity* out_font_identity,
+    SkString* out_family_name,
+    SkTypeface::Style* out_style) {
+  DCHECK_EQ(GetThreadId(), base::PlatformThread::CurrentId());
+
+  font_service_->MatchFamilyName(
+      mojo::String(family_name), static_cast<TypefaceStyle>(requested_style),
+      base::Bind(&FontServiceThread::OnMatchFamilyNameComplete, this,
+                 done_event, out_valid, out_font_identity, out_family_name,
+                 out_style));
+}
+
+void FontServiceThread::OnMatchFamilyNameComplete(
+    base::WaitableEvent* done_event,
+    bool* out_valid,
+    SkFontConfigInterface::FontIdentity* out_font_identity,
+    SkString* out_family_name,
+    SkTypeface::Style* out_style,
+    FontIdentityPtr font_identity,
+    mojo::String family_name,
+    TypefaceStyle style) {
+  DCHECK_EQ(GetThreadId(), base::PlatformThread::CurrentId());
+
+  *out_valid = font_identity;
+  if (font_identity) {
+    out_font_identity->fID = font_identity->id;
+    out_font_identity->fTTCIndex = font_identity->ttc_index;
+    out_font_identity->fString = font_identity->str_representation.data();
+    // TODO(erg): fStyle isn't set. This is rather odd, however it matches the
+    // behaviour of the current Linux IPC version.
+
+    *out_family_name = family_name.data();
+    *out_style = static_cast<SkTypeface::Style>(style);
+  }
+
+  done_event->Signal();
+}
+
+void FontServiceThread::OpenStreamImpl(base::WaitableEvent* done_event,
+                                       base::File* output_file,
+                                       const uint32_t id_number) {
+  DCHECK_EQ(GetThreadId(), base::PlatformThread::CurrentId());
+
+  font_service_->OpenStream(
+      id_number, base::Bind(&FontServiceThread::OnOpenStreamComplete, this,
+                            done_event, output_file));
+}
+
+void FontServiceThread::OnOpenStreamComplete(base::WaitableEvent* done_event,
+                                             base::File* output_file,
+                                             mojo::ScopedHandle handle) {
+  if (handle.is_valid()) {
+    MojoPlatformHandle platform_handle;
+    CHECK(MojoExtractPlatformHandle(handle.release().value(),
+                                    &platform_handle) == MOJO_RESULT_OK);
+    *output_file = base::File(platform_handle).Pass();
+  }
+
+  done_event->Signal();
+}
+
+void FontServiceThread::Init() {
+  font_service_.Bind(font_service_info_.Pass());
+}
+
+void FontServiceThread::CleanUp() {
+  font_service_.reset();
+}
+
+}  // namespace internal
+}  // namespace font_service