1 files changed, 65 insertions, 0 deletions
diff --git a/widget/headless/HeadlessLookAndFeel.h b/widget/headless/HeadlessLookAndFeel.h
new file mode 100644
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+++ b/widget/headless/HeadlessLookAndFeel.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_widget_HeadlessLookAndFeel_h
+#define mozilla_widget_HeadlessLookAndFeel_h
+
+#include "nsXPLookAndFeel.h"
+#include "nsLookAndFeel.h"
+
+namespace mozilla {
+namespace widget {
+
+#if defined(MOZ_WIDGET_GTK)
+
+// Our nsLookAndFeel for Gtk relies on APIs that aren't available in headless
+// mode, so for processes that are unable to connect to a display server, we use
+// an implementation with hardcoded values.
+//
+// HeadlessLookAndFeel is used:
+//
+//   * in the parent process, when full headless mode (MOZ_HEADLESS=1) is
+//     enabled
+//   * in content processes, when full headless mode or headless content
+//     mode (security.sandbox.content.headless) is enabled, unless
+//     widget.remote-look-and-feel is also enabled, in which case
+//     RemoteLookAndFeel is used instead.
+//
+// The result of this is that when headless content mode is enabled, content
+// processes use values derived from the parent's nsLookAndFeel (i.e., values
+// derived from Gtk APIs) while still refraining from making any display server
+// connections.
+
+class HeadlessLookAndFeel : public nsXPLookAndFeel {
+ public:
+  explicit HeadlessLookAndFeel(const LookAndFeelCache* aCache);
+  virtual ~HeadlessLookAndFeel();
+
+  void NativeInit() final{};
+  virtual nsresult NativeGetInt(IntID aID, int32_t& aResult) override;
+  virtual nsresult NativeGetFloat(FloatID aID, float& aResult) override;
+  virtual nsresult NativeGetColor(ColorID aID, nscolor& aResult) override;
+  virtual bool NativeGetFont(FontID aID, nsString& aFontName,
+                             gfxFontStyle& aFontStyle) override;
+
+  virtual void RefreshImpl() override;
+  virtual char16_t GetPasswordCharacterImpl() override;
+  virtual bool GetEchoPasswordImpl() override;
+};
+
+#else
+
+// When possible, we simply reuse the platform's existing nsLookAndFeel
+// implementation in headless mode.
+
+typedef nsLookAndFeel HeadlessLookAndFeel;
+
+#endif
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif