15 files changed, 3364 insertions, 0 deletions

diff --git a/recovery_ui/Android.bp b/recovery_ui/Android.bp
new file mode 100644
index 000000000..ee3149d5e
--- /dev/null
+++ b/recovery_ui/Android.bp
@@ -0,0 +1,91 @@
+// Copyright (C) 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_library {
+    name: "librecovery_ui",
+    recovery_available: true,
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "device.cpp",
+        "screen_ui.cpp",
+        "ui.cpp",
+        "vr_ui.cpp",
+        "wear_ui.cpp",
+    ],
+
+    export_include_dirs: ["include"],
+
+    static_libs: [
+        "libminui",
+        "libotautil",
+    ],
+
+    shared_libs: [
+        "libbase",
+        "libpng",
+        "libz",
+    ],
+}
+
+// Generic device that uses ScreenRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_default",
+    recovery_available: true,
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "default_device.cpp",
+    ],
+
+    export_include_dirs: ["include"],
+}
+
+// The default wear device that uses WearRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_wear",
+    recovery_available: true,
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "wear_device.cpp",
+    ],
+
+    export_include_dirs: ["include"],
+}
+
+// The default VR device that uses VrRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_vr",
+    recovery_available: true,
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "vr_device.cpp",
+    ],
+
+    export_include_dirs: ["include"],
+}
diff --git a/recovery_ui/default_device.cpp b/recovery_ui/default_device.cpp
new file mode 100644
index 000000000..4db461af6
--- /dev/null
+++ b/recovery_ui/default_device.cpp
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/device.h"
+#include "recovery_ui/screen_ui.h"
+
+Device* make_device() {
+  return new Device(new ScreenRecoveryUI);
+}
diff --git a/recovery_ui/device.cpp b/recovery_ui/device.cpp
new file mode 100644
index 000000000..ddb0118db
--- /dev/null
+++ b/recovery_ui/device.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/device.h"
+
+#include <algorithm>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include <android-base/logging.h>
+
+#include "recovery_ui/ui.h"
+
+static std::vector<std::pair<std::string, Device::BuiltinAction>> g_menu_actions{
+  { "Reboot system now", Device::REBOOT },
+  { "Reboot to bootloader", Device::REBOOT_BOOTLOADER },
+  { "Enter fastboot", Device::ENTER_FASTBOOT },
+  { "Apply update from ADB", Device::APPLY_ADB_SIDELOAD },
+  { "Apply update from SD card", Device::APPLY_SDCARD },
+  { "Wipe data/factory reset", Device::WIPE_DATA },
+  { "Wipe cache partition", Device::WIPE_CACHE },
+  { "Mount /system", Device::MOUNT_SYSTEM },
+  { "View recovery logs", Device::VIEW_RECOVERY_LOGS },
+  { "Run graphics test", Device::RUN_GRAPHICS_TEST },
+  { "Run locale test", Device::RUN_LOCALE_TEST },
+  { "Power off", Device::SHUTDOWN },
+};
+
+static std::vector<std::string> g_menu_items;
+
+static void PopulateMenuItems() {
+  g_menu_items.clear();
+  std::transform(g_menu_actions.cbegin(), g_menu_actions.cend(), std::back_inserter(g_menu_items),
+                 [](const auto& entry) { return entry.first; });
+}
+
+Device::Device(RecoveryUI* ui) : ui_(ui) {
+  PopulateMenuItems();
+}
+
+void Device::RemoveMenuItemForAction(Device::BuiltinAction action) {
+  g_menu_actions.erase(
+      std::remove_if(g_menu_actions.begin(), g_menu_actions.end(),
+                     [action](const auto& entry) { return entry.second == action; }));
+  CHECK(!g_menu_actions.empty());
+
+  // Re-populate the menu items.
+  PopulateMenuItems();
+}
+
+const std::vector<std::string>& Device::GetMenuItems() {
+  return g_menu_items;
+}
+
+Device::BuiltinAction Device::InvokeMenuItem(size_t menu_position) {
+  return g_menu_actions[menu_position].second;
+}
+
+int Device::HandleMenuKey(int key, bool visible) {
+  if (!visible) {
+    return kNoAction;
+  }
+
+  switch (key) {
+    case KEY_DOWN:
+    case KEY_VOLUMEDOWN:
+      return kHighlightDown;
+
+    case KEY_UP:
+    case KEY_VOLUMEUP:
+      return kHighlightUp;
+
+    case KEY_ENTER:
+    case KEY_POWER:
+      return kInvokeItem;
+
+    default:
+      // If you have all of the above buttons, any other buttons
+      // are ignored. Otherwise, any button cycles the highlight.
+      return ui_->HasThreeButtons() ? kNoAction : kHighlightDown;
+  }
+}
diff --git a/recovery_ui/include/recovery_ui/device.h b/recovery_ui/include/recovery_ui/device.h
new file mode 100644
index 000000000..cfa914e77
--- /dev/null
+++ b/recovery_ui/include/recovery_ui/device.h
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _RECOVERY_DEVICE_H
+#define _RECOVERY_DEVICE_H
+
+#include <stddef.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+// Forward declaration to avoid including "ui.h".
+class RecoveryUI;
+
+class Device {
+ public:
+  static constexpr const int kNoAction = -1;
+  static constexpr const int kHighlightUp = -2;
+  static constexpr const int kHighlightDown = -3;
+  static constexpr const int kInvokeItem = -4;
+
+  enum BuiltinAction {
+    NO_ACTION = 0,
+    REBOOT = 1,
+    APPLY_SDCARD = 2,
+    // APPLY_CACHE was 3.
+    APPLY_ADB_SIDELOAD = 4,
+    WIPE_DATA = 5,
+    WIPE_CACHE = 6,
+    REBOOT_BOOTLOADER = 7,
+    SHUTDOWN = 8,
+    VIEW_RECOVERY_LOGS = 9,
+    MOUNT_SYSTEM = 10,
+    RUN_GRAPHICS_TEST = 11,
+    RUN_LOCALE_TEST = 12,
+    KEY_INTERRUPTED = 13,
+    ENTER_FASTBOOT = 14,
+    ENTER_RECOVERY = 15,
+  };
+
+  explicit Device(RecoveryUI* ui);
+  virtual ~Device() {}
+
+  // Returns a raw pointer to the RecoveryUI object.
+  virtual RecoveryUI* GetUI() {
+    return ui_.get();
+  }
+
+  // Resets the UI object to the given UI. Used to override the default UI in case initialization
+  // failed, or we want a different UI for some reason. The device object will take the ownership.
+  virtual void ResetUI(RecoveryUI* ui) {
+    ui_.reset(ui);
+  }
+
+  // Called when recovery starts up (after the UI has been obtained and initialized and after the
+  // arguments have been parsed, but before anything else).
+  virtual void StartRecovery() {}
+
+  // Called from the main thread when recovery is at the main menu and waiting for input, and a key
+  // is pressed. (Note that "at" the main menu does not necessarily mean the menu is visible;
+  // recovery will be at the main menu with it invisible after an unsuccessful operation, such as
+  // failed to install an OTA package, or if recovery is started with no command.)
+  //
+  // 'key' is the code of the key just pressed. (You can call IsKeyPressed() on the RecoveryUI
+  // object you returned from GetUI() if you want to find out if other keys are held down.)
+  //
+  // 'visible' is true if the menu is visible.
+  //
+  // Returns one of the defined constants below in order to:
+  //   - move the menu highlight (kHighlight{Up,Down}: negative value)
+  //   - invoke the highlighted item (kInvokeItem: negative value)
+  //   - do nothing (kNoAction: negative value)
+  //   - invoke a specific action (a menu position: non-negative value)
+  virtual int HandleMenuKey(int key, bool visible);
+
+  // Returns the list of menu items (a vector of strings). The menu_position passed to
+  // InvokeMenuItem() will correspond to the indexes into this array.
+  virtual const std::vector<std::string>& GetMenuItems();
+
+  // Performs a recovery action selected from the menu. 'menu_position' will be the index of the
+  // selected menu item, or a non-negative value returned from HandleMenuKey(). The menu will be
+  // hidden when this is called; implementations can call ui_print() to print information to the
+  // screen. If the menu position is one of the builtin actions, you can just return the
+  // corresponding enum value. If it is an action specific to your device, you actually perform it
+  // here and return NO_ACTION.
+  virtual BuiltinAction InvokeMenuItem(size_t menu_position);
+
+  // Removes the menu item for the given action. This allows tailoring the menu based on the
+  // runtime info, such as the availability of /cache or /sdcard.
+  virtual void RemoveMenuItemForAction(Device::BuiltinAction action);
+
+  // Called before and after we do a wipe data/factory reset operation, either via a reboot from the
+  // main system with the --wipe_data flag, or when the user boots into recovery image manually and
+  // selects the option from the menu, to perform whatever device-specific wiping actions as needed.
+  // Returns true on success; returning false from PreWipeData will prevent the regular wipe, and
+  // returning false from PostWipeData will cause the wipe to be considered a failure.
+  virtual bool PreWipeData() {
+    return true;
+  }
+
+  virtual bool PostWipeData() {
+    return true;
+  }
+
+ private:
+  // The RecoveryUI object that should be used to display the user interface for this device.
+  std::unique_ptr<RecoveryUI> ui_;
+};
+
+// Disable name mangling, as this function will be loaded via dlsym(3).
+extern "C" {
+
+// The device-specific library must define this function (or the default one will be used, if there
+// is no device-specific library). It returns the Device object that recovery should use.
+Device* make_device();
+}
+
+#endif  // _DEVICE_H
diff --git a/recovery_ui/include/recovery_ui/screen_ui.h b/recovery_ui/include/recovery_ui/screen_ui.h
new file mode 100644
index 000000000..5cda2a2e5
--- /dev/null
+++ b/recovery_ui/include/recovery_ui/screen_ui.h
@@ -0,0 +1,412 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RECOVERY_SCREEN_UI_H
+#define RECOVERY_SCREEN_UI_H
+
+#include <stdio.h>
+
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <string>
+#include <thread>
+#include <vector>
+
+#include "ui.h"
+
+// From minui/minui.h.
+class GRSurface;
+
+enum class UIElement {
+  HEADER,
+  MENU,
+  MENU_SEL_BG,
+  MENU_SEL_BG_ACTIVE,
+  MENU_SEL_FG,
+  LOG,
+  TEXT_FILL,
+  INFO
+};
+
+// Interface to draw the UI elements on the screen.
+class DrawInterface {
+ public:
+  virtual ~DrawInterface() = default;
+
+  // Sets the color to the predefined value for |element|.
+  virtual void SetColor(UIElement element) const = 0;
+
+  // Draws a highlight bar at (x, y) - (x + width, y + height).
+  virtual void DrawHighlightBar(int x, int y, int width, int height) const = 0;
+
+  // Draws a horizontal rule at Y. Returns the offset it should be moving along Y-axis.
+  virtual int DrawHorizontalRule(int y) const = 0;
+
+  // Draws a line of text. Returns the offset it should be moving along Y-axis.
+  virtual int DrawTextLine(int x, int y, const std::string& line, bool bold) const = 0;
+
+  // Draws surface portion (sx, sy, w, h) at screen location (dx, dy).
+  virtual void DrawSurface(const GRSurface* surface, int sx, int sy, int w, int h, int dx,
+                           int dy) const = 0;
+
+  // Draws rectangle at (x, y) - (x + w, y + h).
+  virtual void DrawFill(int x, int y, int w, int h) const = 0;
+
+  // Draws given surface (surface->pixel_bytes = 1) as text at (x, y).
+  virtual void DrawTextIcon(int x, int y, const GRSurface* surface) const = 0;
+
+  // Draws multiple text lines. Returns the offset it should be moving along Y-axis.
+  virtual int DrawTextLines(int x, int y, const std::vector<std::string>& lines) const = 0;
+
+  // Similar to DrawTextLines() to draw multiple text lines, but additionally wraps long lines. It
+  // keeps symmetrical margins of 'x' at each end of a line. Returns the offset it should be moving
+  // along Y-axis.
+  virtual int DrawWrappedTextLines(int x, int y, const std::vector<std::string>& lines) const = 0;
+};
+
+// Interface for classes that maintain the menu selection and display.
+class Menu {
+ public:
+  virtual ~Menu() = default;
+  // Returns the current menu selection.
+  size_t selection() const;
+  // Sets the current selection to |sel|. Handle the overflow cases depending on if the menu is
+  // scrollable.
+  virtual int Select(int sel) = 0;
+  // Displays the menu headers on the screen at offset x, y
+  virtual int DrawHeader(int x, int y) const = 0;
+  // Iterates over the menu items and displays each of them at offset x, y.
+  virtual int DrawItems(int x, int y, int screen_width, bool long_press) const = 0;
+
+ protected:
+  Menu(size_t initial_selection, const DrawInterface& draw_func);
+  // Current menu selection.
+  size_t selection_;
+  // Reference to the class that implements all the draw functions.
+  const DrawInterface& draw_funcs_;
+};
+
+// This class uses strings as the menu header and items.
+class TextMenu : public Menu {
+ public:
+  // Constructs a Menu instance with the given |headers|, |items| and properties. Sets the initial
+  // selection to |initial_selection|.
+  TextMenu(bool scrollable, size_t max_items, size_t max_length,
+           const std::vector<std::string>& headers, const std::vector<std::string>& items,
+           size_t initial_selection, int char_height, const DrawInterface& draw_funcs);
+
+  int Select(int sel) override;
+  int DrawHeader(int x, int y) const override;
+  int DrawItems(int x, int y, int screen_width, bool long_press) const override;
+
+  bool scrollable() const {
+    return scrollable_;
+  }
+
+  // Returns count of menu items.
+  size_t ItemsCount() const;
+
+  // Returns the index of the first menu item.
+  size_t MenuStart() const;
+
+  // Returns the index of the last menu item + 1.
+  size_t MenuEnd() const;
+
+  // Menu example:
+  // info:                           Android Recovery
+  //                                 ....
+  // help messages:                  Swipe up/down to move
+  //                                 Swipe left/right to select
+  // empty line (horizontal rule):
+  // menu headers:                   Select file to view
+  // menu items:                     /cache/recovery/last_log
+  //                                 /cache/recovery/last_log.1
+  //                                 /cache/recovery/last_log.2
+  //                                 ...
+  const std::vector<std::string>& text_headers() const;
+  std::string TextItem(size_t index) const;
+
+  // Checks if the menu items fit vertically on the screen. Returns true and set the
+  // |cur_selection_str| if the items exceed the screen limit.
+  bool ItemsOverflow(std::string* cur_selection_str) const;
+
+ private:
+  // The menu is scrollable to display more items. Used on wear devices who have smaller screens.
+  const bool scrollable_;
+  // The max number of menu items to fit vertically on a screen.
+  const size_t max_display_items_;
+  // The length of each item to fit horizontally on a screen.
+  const size_t max_item_length_;
+  // The menu headers.
+  std::vector<std::string> text_headers_;
+  // The actual menu items trimmed to fit the given properties.
+  std::vector<std::string> text_items_;
+  // The first item to display on the screen.
+  size_t menu_start_;
+
+  // Height in pixels of each character.
+  int char_height_;
+};
+
+// This class uses GRSurface's as the menu header and items.
+class GraphicMenu : public Menu {
+ public:
+  // Constructs a Menu instance with the given |headers|, |items| and properties. Sets the initial
+  // selection to |initial_selection|. |headers| and |items| will be made local copies.
+  GraphicMenu(const GRSurface* graphic_headers, const std::vector<const GRSurface*>& graphic_items,
+              size_t initial_selection, const DrawInterface& draw_funcs);
+
+  int Select(int sel) override;
+  int DrawHeader(int x, int y) const override;
+  int DrawItems(int x, int y, int screen_width, bool long_press) const override;
+
+  // Checks if all the header and items are valid GRSurface's; and that they can fit in the area
+  // defined by |max_width| and |max_height|.
+  static bool Validate(size_t max_width, size_t max_height, const GRSurface* graphic_headers,
+                       const std::vector<const GRSurface*>& graphic_items);
+
+  // Returns true if |surface| fits on the screen with a vertical offset |y|.
+  static bool ValidateGraphicSurface(size_t max_width, size_t max_height, int y,
+                                     const GRSurface* surface);
+
+ private:
+  // Menu headers and items in graphic icons. These are the copies owned by the class instance.
+  std::unique_ptr<GRSurface> graphic_headers_;
+  std::vector<std::unique_ptr<GRSurface>> graphic_items_;
+};
+
+// Implementation of RecoveryUI appropriate for devices with a screen
+// (shows an icon + a progress bar, text logging, menu, etc.)
+class ScreenRecoveryUI : public RecoveryUI, public DrawInterface {
+ public:
+  ScreenRecoveryUI();
+  explicit ScreenRecoveryUI(bool scrollable_menu);
+  ~ScreenRecoveryUI() override;
+
+  bool Init(const std::string& locale) override;
+  std::string GetLocale() const override;
+
+  // overall recovery state ("background image")
+  void SetBackground(Icon icon) override;
+  void SetSystemUpdateText(bool security_update) override;
+
+  // progress indicator
+  void SetProgressType(ProgressType type) override;
+  void ShowProgress(float portion, float seconds) override;
+  void SetProgress(float fraction) override;
+
+  void SetStage(int current, int max) override;
+
+  // text log
+  void ShowText(bool visible) override;
+  bool IsTextVisible() override;
+  bool WasTextEverVisible() override;
+
+  // printing messages
+  void Print(const char* fmt, ...) override __printflike(2, 3);
+  void PrintOnScreenOnly(const char* fmt, ...) override __printflike(2, 3);
+  void ShowFile(const std::string& filename) override;
+
+  // menu display
+  size_t ShowMenu(const std::vector<std::string>& headers, const std::vector<std::string>& items,
+                  size_t initial_selection, bool menu_only,
+                  const std::function<int(int, bool)>& key_handler) override;
+  void SetTitle(const std::vector<std::string>& lines) override;
+
+  void KeyLongPress(int) override;
+
+  void Redraw();
+
+  // Checks the background text image, for debugging purpose. It iterates the locales embedded in
+  // the on-device resource files and shows the localized text, for manual inspection.
+  void CheckBackgroundTextImages();
+
+  // Displays the localized wipe data menu.
+  size_t ShowPromptWipeDataMenu(const std::vector<std::string>& backup_headers,
+                                const std::vector<std::string>& backup_items,
+                                const std::function<int(int, bool)>& key_handler) override;
+
+  // Displays the localized wipe data confirmation menu.
+  size_t ShowPromptWipeDataConfirmationMenu(
+      const std::vector<std::string>& backup_headers, const std::vector<std::string>& backup_items,
+      const std::function<int(int, bool)>& key_handler) override;
+
+ protected:
+  static constexpr int kMenuIndent = 4;
+
+  // The margin that we don't want to use for showing texts (e.g. round screen, or screen with
+  // rounded corners).
+  const int margin_width_;
+  const int margin_height_;
+
+  // Number of frames per sec (default: 30) for both parts of the animation.
+  const int animation_fps_;
+
+  // The scale factor from dp to pixels. 1.0 for mdpi, 4.0 for xxxhdpi.
+  const float density_;
+
+  virtual bool InitTextParams();
+
+  virtual bool LoadWipeDataMenuText();
+
+  // Creates a GraphicMenu with |graphic_header| and |graphic_items|. If the GraphicMenu isn't
+  // valid or it doesn't fit on the screen; falls back to create a TextMenu instead. If succeeds,
+  // returns a unique pointer to the created menu; otherwise returns nullptr.
+  virtual std::unique_ptr<Menu> CreateMenu(const GRSurface* graphic_header,
+                                           const std::vector<const GRSurface*>& graphic_items,
+                                           const std::vector<std::string>& text_headers,
+                                           const std::vector<std::string>& text_items,
+                                           size_t initial_selection) const;
+
+  // Creates a TextMenu with |text_headers| and |text_items|; and sets the menu selection to
+  // |initial_selection|.
+  virtual std::unique_ptr<Menu> CreateMenu(const std::vector<std::string>& text_headers,
+                                           const std::vector<std::string>& text_items,
+                                           size_t initial_selection) const;
+
+  // Takes the ownership of |menu| and displays it.
+  virtual size_t ShowMenu(std::unique_ptr<Menu>&& menu, bool menu_only,
+                          const std::function<int(int, bool)>& key_handler);
+
+  // Sets the menu highlight to the given index, wrapping if necessary. Returns the actual item
+  // selected.
+  virtual int SelectMenu(int sel);
+
+  virtual void draw_background_locked();
+  virtual void draw_foreground_locked();
+  virtual void draw_screen_locked();
+  virtual void draw_menu_and_text_buffer_locked(const std::vector<std::string>& help_message);
+  virtual void update_screen_locked();
+  virtual void update_progress_locked();
+
+  const GRSurface* GetCurrentFrame() const;
+  const GRSurface* GetCurrentText() const;
+
+  void ProgressThreadLoop();
+
+  virtual void ShowFile(FILE*);
+  virtual void PrintV(const char*, bool, va_list);
+  void PutChar(char);
+  void ClearText();
+
+  void LoadAnimation();
+  std::unique_ptr<GRSurface> LoadBitmap(const std::string& filename);
+  std::unique_ptr<GRSurface> LoadLocalizedBitmap(const std::string& filename);
+
+  int PixelsFromDp(int dp) const;
+  virtual int GetAnimationBaseline() const;
+  virtual int GetProgressBaseline() const;
+  virtual int GetTextBaseline() const;
+
+  // Returns pixel width of draw buffer.
+  virtual int ScreenWidth() const;
+  // Returns pixel height of draw buffer.
+  virtual int ScreenHeight() const;
+
+  // Implementation of the draw functions in DrawInterface.
+  void SetColor(UIElement e) const override;
+  void DrawHighlightBar(int x, int y, int width, int height) const override;
+  int DrawHorizontalRule(int y) const override;
+  void DrawSurface(const GRSurface* surface, int sx, int sy, int w, int h, int dx,
+                   int dy) const override;
+  void DrawFill(int x, int y, int w, int h) const override;
+  void DrawTextIcon(int x, int y, const GRSurface* surface) const override;
+  int DrawTextLine(int x, int y, const std::string& line, bool bold) const override;
+  int DrawTextLines(int x, int y, const std::vector<std::string>& lines) const override;
+  int DrawWrappedTextLines(int x, int y, const std::vector<std::string>& lines) const override;
+
+  // The layout to use.
+  int layout_;
+
+  // The images that contain localized texts.
+  std::unique_ptr<GRSurface> erasing_text_;
+  std::unique_ptr<GRSurface> error_text_;
+  std::unique_ptr<GRSurface> installing_text_;
+  std::unique_ptr<GRSurface> no_command_text_;
+
+  // Localized text images for the wipe data menu.
+  std::unique_ptr<GRSurface> cancel_wipe_data_text_;
+  std::unique_ptr<GRSurface> factory_data_reset_text_;
+  std::unique_ptr<GRSurface> try_again_text_;
+  std::unique_ptr<GRSurface> wipe_data_confirmation_text_;
+  std::unique_ptr<GRSurface> wipe_data_menu_header_text_;
+
+  std::unique_ptr<GRSurface> fastbootd_logo_;
+
+  // current_icon_ points to one of the frames in intro_frames_ or loop_frames_, indexed by
+  // current_frame_, or error_icon_.
+  Icon current_icon_;
+  std::unique_ptr<GRSurface> error_icon_;
+  std::vector<std::unique_ptr<GRSurface>> intro_frames_;
+  std::vector<std::unique_ptr<GRSurface>> loop_frames_;
+  size_t current_frame_;
+  bool intro_done_;
+
+  // progress_bar and stage_marker images.
+  std::unique_ptr<GRSurface> progress_bar_empty_;
+  std::unique_ptr<GRSurface> progress_bar_fill_;
+  std::unique_ptr<GRSurface> stage_marker_empty_;
+  std::unique_ptr<GRSurface> stage_marker_fill_;
+
+  ProgressType progressBarType;
+
+  float progressScopeStart, progressScopeSize, progress;
+  double progressScopeTime, progressScopeDuration;
+
+  // true when both graphics pages are the same (except for the progress bar).
+  bool pagesIdentical;
+
+  size_t text_cols_, text_rows_;
+
+  // Log text overlay, displayed when a magic key is pressed.
+  char** text_;
+  size_t text_col_, text_row_;
+
+  bool show_text;
+  bool show_text_ever;  // has show_text ever been true?
+
+  std::vector<std::string> title_lines_;
+
+  bool scrollable_menu_;
+  std::unique_ptr<Menu> menu_;
+
+  // An alternate text screen, swapped with 'text_' when we're viewing a log file.
+  char** file_viewer_text_;
+
+  std::thread progress_thread_;
+  std::atomic<bool> progress_thread_stopped_{ false };
+
+  int stage, max_stage;
+
+  int char_width_;
+  int char_height_;
+
+  // The locale that's used to show the rendered texts.
+  std::string locale_;
+  bool rtl_locale_;
+
+  std::mutex updateMutex;
+
+ private:
+  void SetLocale(const std::string&);
+
+  // Display the background texts for "erasing", "error", "no_command" and "installing" for the
+  // selected locale.
+  void SelectAndShowBackgroundText(const std::vector<std::string>& locales_entries, size_t sel);
+};
+
+#endif  // RECOVERY_UI_H
diff --git a/recovery_ui/include/recovery_ui/stub_ui.h b/recovery_ui/include/recovery_ui/stub_ui.h
new file mode 100644
index 000000000..fb1d8c7a6
--- /dev/null
+++ b/recovery_ui/include/recovery_ui/stub_ui.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RECOVERY_STUB_UI_H
+#define RECOVERY_STUB_UI_H
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "ui.h"
+
+// Stub implementation of RecoveryUI for devices without screen.
+class StubRecoveryUI : public RecoveryUI {
+ public:
+  StubRecoveryUI() = default;
+
+  std::string GetLocale() const override {
+    return "";
+  }
+  void SetBackground(Icon /* icon */) override {}
+  void SetSystemUpdateText(bool /* security_update */) override {}
+
+  // progress indicator
+  void SetProgressType(ProgressType /* type */) override {}
+  void ShowProgress(float /* portion */, float /* seconds */) override {}
+  void SetProgress(float /* fraction */) override {}
+
+  void SetStage(int /* current */, int /* max */) override {}
+
+  // text log
+  void ShowText(bool /* visible */) override {}
+  bool IsTextVisible() override {
+    return false;
+  }
+  bool WasTextEverVisible() override {
+    return false;
+  }
+
+  // printing messages
+  void Print(const char* fmt, ...) override {
+    va_list ap;
+    va_start(ap, fmt);
+    vprintf(fmt, ap);
+    va_end(ap);
+  }
+  void PrintOnScreenOnly(const char* /* fmt */, ...) override {}
+  void ShowFile(const std::string& /* filename */) override {}
+
+  // menu display
+  size_t ShowMenu(const std::vector<std::string>& /* headers */,
+                  const std::vector<std::string>& /* items */, size_t initial_selection,
+                  bool /* menu_only */,
+                  const std::function<int(int, bool)>& /* key_handler */) override {
+    return initial_selection;
+  }
+
+  size_t ShowPromptWipeDataMenu(const std::vector<std::string>& /* backup_headers */,
+                                const std::vector<std::string>& /* backup_items */,
+                                const std::function<int(int, bool)>& /* key_handle */) override {
+    return 0;
+  }
+
+  size_t ShowPromptWipeDataConfirmationMenu(
+      const std::vector<std::string>& /* backup_headers */,
+      const std::vector<std::string>& /* backup_items */,
+      const std::function<int(int, bool)>& /* key_handle */) override {
+    return 0;
+  }
+
+  void SetTitle(const std::vector<std::string>& /* lines */) override {}
+};
+
+#endif  // RECOVERY_STUB_UI_H
diff --git a/recovery_ui/include/recovery_ui/ui.h b/recovery_ui/include/recovery_ui/ui.h
new file mode 100644
index 000000000..d55322cf0
--- /dev/null
+++ b/recovery_ui/include/recovery_ui/ui.h
@@ -0,0 +1,272 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RECOVERY_UI_H
+#define RECOVERY_UI_H
+
+#include <linux/input.h>  // KEY_MAX
+
+#include <atomic>
+#include <condition_variable>
+#include <functional>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <vector>
+
+// Abstract class for controlling the user interface during recovery.
+class RecoveryUI {
+ public:
+  enum Icon {
+    NONE,
+    INSTALLING_UPDATE,
+    ERASING,
+    NO_COMMAND,
+    ERROR,
+  };
+
+  enum ProgressType {
+    EMPTY,
+    INDETERMINATE,
+    DETERMINATE,
+  };
+
+  enum KeyAction {
+    ENQUEUE,
+    TOGGLE,
+    REBOOT,
+    IGNORE,
+  };
+
+  enum class KeyError : int {
+    TIMED_OUT = -1,
+    INTERRUPTED = -2,
+  };
+
+  RecoveryUI();
+
+  virtual ~RecoveryUI();
+
+  // Initializes the object; called before anything else. UI texts will be initialized according
+  // to the given locale. Returns true on success.
+  virtual bool Init(const std::string& locale);
+
+  virtual std::string GetLocale() const = 0;
+
+  // Shows a stage indicator. Called immediately after Init().
+  virtual void SetStage(int current, int max) = 0;
+
+  // Sets the overall recovery state ("background image").
+  virtual void SetBackground(Icon icon) = 0;
+  virtual void SetSystemUpdateText(bool security_update) = 0;
+
+  // --- progress indicator ---
+  virtual void SetProgressType(ProgressType determinate) = 0;
+
+  // Shows a progress bar and define the scope of the next operation:
+  //   portion - fraction of the progress bar the next operation will use
+  //   seconds - expected time interval (progress bar moves at this minimum rate)
+  virtual void ShowProgress(float portion, float seconds) = 0;
+
+  // Sets progress bar position (0.0 - 1.0 within the scope defined by the last call to
+  // ShowProgress).
+  virtual void SetProgress(float fraction) = 0;
+
+  // --- text log ---
+
+  virtual void ShowText(bool visible) = 0;
+
+  virtual bool IsTextVisible() = 0;
+
+  virtual bool WasTextEverVisible() = 0;
+
+  // Writes a message to the on-screen log (shown if the user has toggled on the text display).
+  // Print() will also dump the message to stdout / log file, while PrintOnScreenOnly() not.
+  virtual void Print(const char* fmt, ...) __printflike(2, 3) = 0;
+  virtual void PrintOnScreenOnly(const char* fmt, ...) __printflike(2, 3) = 0;
+
+  // Shows the contents of the given file. Caller ensures the patition that contains the file has
+  // been mounted.
+  virtual void ShowFile(const std::string& filename) = 0;
+
+  // --- key handling ---
+
+  // Waits for a key and return it. May return TIMED_OUT after timeout and
+  // KeyError::INTERRUPTED on a key interrupt.
+  virtual int WaitKey();
+
+  // Wakes up the UI if it is waiting on key input, causing WaitKey to return KeyError::INTERRUPTED.
+  virtual void InterruptKey();
+
+  virtual bool IsKeyPressed(int key);
+  virtual bool IsLongPress();
+
+  // Returns true if you have the volume up/down and power trio typical of phones and tablets, false
+  // otherwise.
+  virtual bool HasThreeButtons();
+
+  // Returns true if it has a power key.
+  virtual bool HasPowerKey() const;
+
+  // Returns true if it supports touch inputs.
+  virtual bool HasTouchScreen() const;
+
+  // Erases any queued-up keys.
+  virtual void FlushKeys();
+
+  // Called on each key press, even while operations are in progress. Return value indicates whether
+  // an immediate operation should be triggered (toggling the display, rebooting the device), or if
+  // the key should be enqueued for use by the main thread.
+  virtual KeyAction CheckKey(int key, bool is_long_press);
+
+  // Called when a key is held down long enough to have been a long-press (but before the key is
+  // released). This means that if the key is eventually registered (released without any other keys
+  // being pressed in the meantime), CheckKey will be called with 'is_long_press' true.
+  virtual void KeyLongPress(int key);
+
+  // Normally in recovery there's a key sequence that triggers immediate reboot of the device,
+  // regardless of what recovery is doing (with the default CheckKey implementation, it's pressing
+  // the power button 7 times in row). Call this to enable or disable that feature. It is enabled by
+  // default.
+  virtual void SetEnableReboot(bool enabled);
+
+  // --- menu display ---
+
+  virtual void SetTitle(const std::vector<std::string>& lines) = 0;
+
+  // Displays a menu with the given 'headers' and 'items'. The supplied 'key_handler' callback,
+  // which is typically bound to Device::HandleMenuKey(), should return the expected action for the
+  // given key code and menu visibility (e.g. to move the cursor or to select an item). Caller sets
+  // 'menu_only' to true to ensure only a menu item gets selected and returned. Otherwise if
+  // 'menu_only' is false, ShowMenu() will forward any non-negative value returned from the
+  // key_handler, which may be beyond the range of menu items. This could be used to trigger a
+  // device-specific action, even without that being listed in the menu. Caller needs to handle
+  // such a case accordingly (e.g. by calling Device::InvokeMenuItem() to process the action).
+  // Returns a non-negative value (the chosen item number or device-specific action code), or
+  // static_cast<size_t>(TIMED_OUT) if timed out waiting for input or
+  // static_cast<size_t>(ERR_KEY_INTERTUPT) if interrupted, such as by InterruptKey().
+  virtual size_t ShowMenu(const std::vector<std::string>& headers,
+                          const std::vector<std::string>& items, size_t initial_selection,
+                          bool menu_only, const std::function<int(int, bool)>& key_handler) = 0;
+
+  // Displays the localized wipe data menu with pre-generated graphs. If there's an issue
+  // with the graphs, falls back to use the backup string headers and items instead. The initial
+  // selection is the 0th item in the menu, which is expected to reboot the device without a wipe.
+  virtual size_t ShowPromptWipeDataMenu(const std::vector<std::string>& backup_headers,
+                                        const std::vector<std::string>& backup_items,
+                                        const std::function<int(int, bool)>& key_handler) = 0;
+  // Displays the localized wipe data confirmation menu with pre-generated images. Falls back to
+  // the text strings upon failures. The initial selection is the 0th item, which returns to the
+  // upper level menu.
+  virtual size_t ShowPromptWipeDataConfirmationMenu(
+      const std::vector<std::string>& backup_headers, const std::vector<std::string>& backup_items,
+      const std::function<int(int, bool)>& key_handler) = 0;
+
+  // Set whether or not the fastbootd logo is displayed.
+  void SetEnableFastbootdLogo(bool enable) {
+    fastbootd_logo_enabled_ = enable;
+  }
+
+  // Resets the key interrupt status.
+  void ResetKeyInterruptStatus() {
+    key_interrupted_ = false;
+  }
+
+  // Returns the key interrupt status.
+  bool IsKeyInterrupted() const {
+    return key_interrupted_;
+  }
+
+ protected:
+  void EnqueueKey(int key_code);
+
+  // The normal and dimmed brightness percentages (default: 50 and 25, which means 50% and 25% of
+  // the max_brightness). Because the absolute values may vary across devices. These two values can
+  // be configured via subclassing. Setting brightness_normal_ to 0 to disable screensaver.
+  unsigned int brightness_normal_;
+  unsigned int brightness_dimmed_;
+  std::string brightness_file_;
+  std::string max_brightness_file_;
+
+  // Whether we should listen for touch inputs (default: false).
+  bool touch_screen_allowed_;
+
+  bool fastbootd_logo_enabled_;
+
+ private:
+  enum class ScreensaverState {
+    DISABLED,
+    NORMAL,
+    DIMMED,
+    OFF,
+  };
+
+  // The sensitivity when detecting a swipe.
+  const int touch_low_threshold_;
+  const int touch_high_threshold_;
+
+  void OnKeyDetected(int key_code);
+  void OnTouchDetected(int dx, int dy);
+  int OnInputEvent(int fd, uint32_t epevents);
+  void ProcessKey(int key_code, int updown);
+  void TimeKey(int key_code, int count);
+
+  bool IsUsbConnected();
+
+  bool InitScreensaver();
+  void SetScreensaverState(ScreensaverState state);
+  // Key event input queue
+  std::mutex key_queue_mutex;
+  std::condition_variable key_queue_cond;
+  bool key_interrupted_;
+  int key_queue[256], key_queue_len;
+  char key_pressed[KEY_MAX + 1];  // under key_queue_mutex
+  int key_last_down;              // under key_queue_mutex
+  bool key_long_press;            // under key_queue_mutex
+  int key_down_count;             // under key_queue_mutex
+  bool enable_reboot;             // under key_queue_mutex
+  int rel_sum;
+
+  int consecutive_power_keys;
+  int last_key;
+
+  bool has_power_key;
+  bool has_up_key;
+  bool has_down_key;
+  bool has_touch_screen;
+
+  // Touch event related variables. See the comments in RecoveryUI::OnInputEvent().
+  int touch_slot_;
+  int touch_X_;
+  int touch_Y_;
+  int touch_start_X_;
+  int touch_start_Y_;
+  bool touch_finger_down_;
+  bool touch_swiping_;
+  bool is_bootreason_recovery_ui_;
+
+  std::thread input_thread_;
+  std::atomic<bool> input_thread_stopped_{ false };
+
+  ScreensaverState screensaver_state_;
+
+  // The following two contain the absolute values computed from brightness_normal_ and
+  // brightness_dimmed_ respectively.
+  unsigned int brightness_normal_value_;
+  unsigned int brightness_dimmed_value_;
+};
+
+#endif  // RECOVERY_UI_H
diff --git a/recovery_ui/include/recovery_ui/vr_ui.h b/recovery_ui/include/recovery_ui/vr_ui.h
new file mode 100644
index 000000000..2e8ac5921
--- /dev/null
+++ b/recovery_ui/include/recovery_ui/vr_ui.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RECOVERY_VR_UI_H
+#define RECOVERY_VR_UI_H
+
+#include <string>
+
+#include "screen_ui.h"
+
+class VrRecoveryUI : public ScreenRecoveryUI {
+ public:
+  VrRecoveryUI();
+
+ protected:
+  // Pixel offsets to move drawing functions to visible range.
+  // Can vary per device depending on screen size and lens distortion.
+  const int stereo_offset_;
+
+  int ScreenWidth() const override;
+  int ScreenHeight() const override;
+
+  void DrawSurface(const GRSurface* surface, int sx, int sy, int w, int h, int dx,
+                   int dy) const override;
+  int DrawHorizontalRule(int y) const override;
+  void DrawHighlightBar(int x, int y, int width, int height) const override;
+  void DrawFill(int x, int y, int w, int h) const override;
+  void DrawTextIcon(int x, int y, const GRSurface* surface) const override;
+  int DrawTextLine(int x, int y, const std::string& line, bool bold) const override;
+};
+
+#endif  // RECOVERY_VR_UI_H
diff --git a/recovery_ui/include/recovery_ui/wear_ui.h b/recovery_ui/include/recovery_ui/wear_ui.h
new file mode 100644
index 000000000..429af69d2
--- /dev/null
+++ b/recovery_ui/include/recovery_ui/wear_ui.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RECOVERY_WEAR_UI_H
+#define RECOVERY_WEAR_UI_H
+
+#include <string>
+#include <vector>
+
+#include "screen_ui.h"
+
+class WearRecoveryUI : public ScreenRecoveryUI {
+ public:
+  WearRecoveryUI();
+
+  void SetStage(int current, int max) override;
+
+ protected:
+  // progress bar vertical position, it's centered horizontally
+  const int progress_bar_baseline_;
+
+  // Unusable rows when displaying the recovery menu, including the lines for headers (Android
+  // Recovery, build id and etc) and the bottom lines that may otherwise go out of the screen.
+  const int menu_unusable_rows_;
+
+  std::unique_ptr<Menu> CreateMenu(const std::vector<std::string>& text_headers,
+                                   const std::vector<std::string>& text_items,
+                                   size_t initial_selection) const override;
+
+  int GetProgressBaseline() const override;
+
+  void update_progress_locked() override;
+
+ private:
+  void draw_background_locked() override;
+  void draw_screen_locked() override;
+};
+
+#endif  // RECOVERY_WEAR_UI_H
diff --git a/recovery_ui/screen_ui.cpp b/recovery_ui/screen_ui.cpp
new file mode 100644
index 000000000..870db621c
--- /dev/null
+++ b/recovery_ui/screen_ui.cpp
@@ -0,0 +1,1334 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/screen_ui.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <chrono>
+#include <memory>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <vector>
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+
+#include "minui/minui.h"
+#include "otautil/paths.h"
+#include "recovery_ui/device.h"
+#include "recovery_ui/ui.h"
+
+// Return the current time as a double (including fractions of a second).
+static double now() {
+  struct timeval tv;
+  gettimeofday(&tv, nullptr);
+  return tv.tv_sec + tv.tv_usec / 1000000.0;
+}
+
+Menu::Menu(size_t initial_selection, const DrawInterface& draw_func)
+    : selection_(initial_selection), draw_funcs_(draw_func) {}
+
+size_t Menu::selection() const {
+  return selection_;
+}
+
+TextMenu::TextMenu(bool scrollable, size_t max_items, size_t max_length,
+                   const std::vector<std::string>& headers, const std::vector<std::string>& items,
+                   size_t initial_selection, int char_height, const DrawInterface& draw_funcs)
+    : Menu(initial_selection, draw_funcs),
+      scrollable_(scrollable),
+      max_display_items_(max_items),
+      max_item_length_(max_length),
+      text_headers_(headers),
+      menu_start_(0),
+      char_height_(char_height) {
+  CHECK_LE(max_items, static_cast<size_t>(std::numeric_limits<int>::max()));
+
+  // It's fine to have more entries than text_rows_ if scrollable menu is supported.
+  size_t items_count = scrollable_ ? items.size() : std::min(items.size(), max_display_items_);
+  for (size_t i = 0; i < items_count; ++i) {
+    text_items_.emplace_back(items[i].substr(0, max_item_length_));
+  }
+
+  CHECK(!text_items_.empty());
+}
+
+const std::vector<std::string>& TextMenu::text_headers() const {
+  return text_headers_;
+}
+
+std::string TextMenu::TextItem(size_t index) const {
+  CHECK_LT(index, text_items_.size());
+
+  return text_items_[index];
+}
+
+size_t TextMenu::MenuStart() const {
+  return menu_start_;
+}
+
+size_t TextMenu::MenuEnd() const {
+  return std::min(ItemsCount(), menu_start_ + max_display_items_);
+}
+
+size_t TextMenu::ItemsCount() const {
+  return text_items_.size();
+}
+
+bool TextMenu::ItemsOverflow(std::string* cur_selection_str) const {
+  if (!scrollable_ || ItemsCount() <= max_display_items_) {
+    return false;
+  }
+
+  *cur_selection_str =
+      android::base::StringPrintf("Current item: %zu/%zu", selection_ + 1, ItemsCount());
+  return true;
+}
+
+// TODO(xunchang) modify the function parameters to button up & down.
+int TextMenu::Select(int sel) {
+  CHECK_LE(ItemsCount(), static_cast<size_t>(std::numeric_limits<int>::max()));
+  int count = ItemsCount();
+
+  // Wraps the selection at boundary if the menu is not scrollable.
+  if (!scrollable_) {
+    if (sel < 0) {
+      selection_ = count - 1;
+    } else if (sel >= count) {
+      selection_ = 0;
+    } else {
+      selection_ = sel;
+    }
+
+    return selection_;
+  }
+
+  if (sel < 0) {
+    selection_ = 0;
+  } else if (sel >= count) {
+    selection_ = count - 1;
+  } else {
+    if (static_cast<size_t>(sel) < menu_start_) {
+      menu_start_--;
+    } else if (static_cast<size_t>(sel) >= MenuEnd()) {
+      menu_start_++;
+    }
+    selection_ = sel;
+  }
+
+  return selection_;
+}
+
+int TextMenu::DrawHeader(int x, int y) const {
+  int offset = 0;
+
+  draw_funcs_.SetColor(UIElement::HEADER);
+  if (!scrollable()) {
+    offset += draw_funcs_.DrawWrappedTextLines(x, y + offset, text_headers());
+  } else {
+    offset += draw_funcs_.DrawTextLines(x, y + offset, text_headers());
+    // Show the current menu item number in relation to total number if items don't fit on the
+    // screen.
+    std::string cur_selection_str;
+    if (ItemsOverflow(&cur_selection_str)) {
+      offset += draw_funcs_.DrawTextLine(x, y + offset, cur_selection_str, true);
+    }
+  }
+
+  return offset;
+}
+
+int TextMenu::DrawItems(int x, int y, int screen_width, bool long_press) const {
+  int offset = 0;
+
+  draw_funcs_.SetColor(UIElement::MENU);
+  // Do not draw the horizontal rule for wear devices.
+  if (!scrollable()) {
+    offset += draw_funcs_.DrawHorizontalRule(y + offset) + 4;
+  }
+  for (size_t i = MenuStart(); i < MenuEnd(); ++i) {
+    bool bold = false;
+    if (i == selection()) {
+      // Draw the highlight bar.
+      draw_funcs_.SetColor(long_press ? UIElement::MENU_SEL_BG_ACTIVE : UIElement::MENU_SEL_BG);
+
+      int bar_height = char_height_ + 4;
+      draw_funcs_.DrawHighlightBar(0, y + offset - 2, screen_width, bar_height);
+
+      // Bold white text for the selected item.
+      draw_funcs_.SetColor(UIElement::MENU_SEL_FG);
+      bold = true;
+    }
+    offset += draw_funcs_.DrawTextLine(x, y + offset, TextItem(i), bold);
+
+    draw_funcs_.SetColor(UIElement::MENU);
+  }
+  offset += draw_funcs_.DrawHorizontalRule(y + offset);
+
+  return offset;
+}
+
+GraphicMenu::GraphicMenu(const GRSurface* graphic_headers,
+                         const std::vector<const GRSurface*>& graphic_items,
+                         size_t initial_selection, const DrawInterface& draw_funcs)
+    : Menu(initial_selection, draw_funcs) {
+  graphic_headers_ = graphic_headers->Clone();
+  graphic_items_.reserve(graphic_items.size());
+  for (const auto& item : graphic_items) {
+    graphic_items_.emplace_back(item->Clone());
+  }
+}
+
+int GraphicMenu::Select(int sel) {
+  CHECK_LE(graphic_items_.size(), static_cast<size_t>(std::numeric_limits<int>::max()));
+  int count = graphic_items_.size();
+
+  // Wraps the selection at boundary if the menu is not scrollable.
+  if (sel < 0) {
+    selection_ = count - 1;
+  } else if (sel >= count) {
+    selection_ = 0;
+  } else {
+    selection_ = sel;
+  }
+
+  return selection_;
+}
+
+int GraphicMenu::DrawHeader(int x, int y) const {
+  draw_funcs_.SetColor(UIElement::HEADER);
+  draw_funcs_.DrawTextIcon(x, y, graphic_headers_.get());
+  return graphic_headers_->height;
+}
+
+int GraphicMenu::DrawItems(int x, int y, int screen_width, bool long_press) const {
+  int offset = 0;
+
+  draw_funcs_.SetColor(UIElement::MENU);
+  offset += draw_funcs_.DrawHorizontalRule(y + offset) + 4;
+
+  for (size_t i = 0; i < graphic_items_.size(); i++) {
+    auto& item = graphic_items_[i];
+    if (i == selection_) {
+      draw_funcs_.SetColor(long_press ? UIElement::MENU_SEL_BG_ACTIVE : UIElement::MENU_SEL_BG);
+
+      int bar_height = item->height + 4;
+      draw_funcs_.DrawHighlightBar(0, y + offset - 2, screen_width, bar_height);
+
+      // Bold white text for the selected item.
+      draw_funcs_.SetColor(UIElement::MENU_SEL_FG);
+    }
+    draw_funcs_.DrawTextIcon(x, y + offset, item.get());
+    offset += item->height;
+
+    draw_funcs_.SetColor(UIElement::MENU);
+  }
+  offset += draw_funcs_.DrawHorizontalRule(y + offset);
+
+  return offset;
+}
+
+bool GraphicMenu::Validate(size_t max_width, size_t max_height, const GRSurface* graphic_headers,
+                           const std::vector<const GRSurface*>& graphic_items) {
+  int offset = 0;
+  if (!ValidateGraphicSurface(max_width, max_height, offset, graphic_headers)) {
+    return false;
+  }
+  offset += graphic_headers->height;
+
+  for (const auto& item : graphic_items) {
+    if (!ValidateGraphicSurface(max_width, max_height, offset, item)) {
+      return false;
+    }
+    offset += item->height;
+  }
+
+  return true;
+}
+
+bool GraphicMenu::ValidateGraphicSurface(size_t max_width, size_t max_height, int y,
+                                         const GRSurface* surface) {
+  if (!surface) {
+    fprintf(stderr, "Graphic surface can not be null\n");
+    return false;
+  }
+
+  if (surface->pixel_bytes != 1 || surface->width != surface->row_bytes) {
+    fprintf(stderr, "Invalid graphic surface, pixel bytes: %zu, width: %zu row_bytes: %zu\n",
+            surface->pixel_bytes, surface->width, surface->row_bytes);
+    return false;
+  }
+
+  if (surface->width > max_width || surface->height > max_height - y) {
+    fprintf(stderr,
+            "Graphic surface doesn't fit into the screen. width: %zu, height: %zu, max_width: %zu,"
+            " max_height: %zu, vertical offset: %d\n",
+            surface->width, surface->height, max_width, max_height, y);
+    return false;
+  }
+
+  return true;
+}
+
+ScreenRecoveryUI::ScreenRecoveryUI() : ScreenRecoveryUI(false) {}
+
+constexpr int kDefaultMarginHeight = 0;
+constexpr int kDefaultMarginWidth = 0;
+constexpr int kDefaultAnimationFps = 30;
+
+ScreenRecoveryUI::ScreenRecoveryUI(bool scrollable_menu)
+    : margin_width_(
+          android::base::GetIntProperty("ro.recovery.ui.margin_width", kDefaultMarginWidth)),
+      margin_height_(
+          android::base::GetIntProperty("ro.recovery.ui.margin_height", kDefaultMarginHeight)),
+      animation_fps_(
+          android::base::GetIntProperty("ro.recovery.ui.animation_fps", kDefaultAnimationFps)),
+      density_(static_cast<float>(android::base::GetIntProperty("ro.sf.lcd_density", 160)) / 160.f),
+      current_icon_(NONE),
+      current_frame_(0),
+      intro_done_(false),
+      progressBarType(EMPTY),
+      progressScopeStart(0),
+      progressScopeSize(0),
+      progress(0),
+      pagesIdentical(false),
+      text_cols_(0),
+      text_rows_(0),
+      text_(nullptr),
+      text_col_(0),
+      text_row_(0),
+      show_text(false),
+      show_text_ever(false),
+      scrollable_menu_(scrollable_menu),
+      file_viewer_text_(nullptr),
+      stage(-1),
+      max_stage(-1),
+      locale_(""),
+      rtl_locale_(false) {}
+
+ScreenRecoveryUI::~ScreenRecoveryUI() {
+  progress_thread_stopped_ = true;
+  if (progress_thread_.joinable()) {
+    progress_thread_.join();
+  }
+  // No-op if gr_init() (via Init()) was not called or had failed.
+  gr_exit();
+}
+
+const GRSurface* ScreenRecoveryUI::GetCurrentFrame() const {
+  if (current_icon_ == INSTALLING_UPDATE || current_icon_ == ERASING) {
+    return intro_done_ ? loop_frames_[current_frame_].get() : intro_frames_[current_frame_].get();
+  }
+  return error_icon_.get();
+}
+
+const GRSurface* ScreenRecoveryUI::GetCurrentText() const {
+  switch (current_icon_) {
+    case ERASING:
+      return erasing_text_.get();
+    case ERROR:
+      return error_text_.get();
+    case INSTALLING_UPDATE:
+      return installing_text_.get();
+    case NO_COMMAND:
+      return no_command_text_.get();
+    case NONE:
+      abort();
+  }
+}
+
+int ScreenRecoveryUI::PixelsFromDp(int dp) const {
+  return dp * density_;
+}
+
+// Here's the intended layout:
+
+//          | portrait    large        landscape      large
+// ---------+-------------------------------------------------
+//      gap |
+// icon     |                   (200dp)
+//      gap |    68dp      68dp             56dp      112dp
+// text     |                    (14sp)
+//      gap |    32dp      32dp             26dp       52dp
+// progress |                     (2dp)
+//      gap |
+
+// Note that "baseline" is actually the *top* of each icon (because that's how our drawing routines
+// work), so that's the more useful measurement for calling code. We use even top and bottom gaps.
+
+enum Layout { PORTRAIT = 0, PORTRAIT_LARGE = 1, LANDSCAPE = 2, LANDSCAPE_LARGE = 3, LAYOUT_MAX };
+enum Dimension { TEXT = 0, ICON = 1, DIMENSION_MAX };
+static constexpr int kLayouts[LAYOUT_MAX][DIMENSION_MAX] = {
+  { 32, 68 },   // PORTRAIT
+  { 32, 68 },   // PORTRAIT_LARGE
+  { 26, 56 },   // LANDSCAPE
+  { 52, 112 },  // LANDSCAPE_LARGE
+};
+
+int ScreenRecoveryUI::GetAnimationBaseline() const {
+  return GetTextBaseline() - PixelsFromDp(kLayouts[layout_][ICON]) -
+         gr_get_height(loop_frames_[0].get());
+}
+
+int ScreenRecoveryUI::GetTextBaseline() const {
+  return GetProgressBaseline() - PixelsFromDp(kLayouts[layout_][TEXT]) -
+         gr_get_height(installing_text_.get());
+}
+
+int ScreenRecoveryUI::GetProgressBaseline() const {
+  int elements_sum = gr_get_height(loop_frames_[0].get()) + PixelsFromDp(kLayouts[layout_][ICON]) +
+                     gr_get_height(installing_text_.get()) + PixelsFromDp(kLayouts[layout_][TEXT]) +
+                     gr_get_height(progress_bar_fill_.get());
+  int bottom_gap = (ScreenHeight() - elements_sum) / 2;
+  return ScreenHeight() - bottom_gap - gr_get_height(progress_bar_fill_.get());
+}
+
+// Clear the screen and draw the currently selected background icon (if any).
+// Should only be called with updateMutex locked.
+void ScreenRecoveryUI::draw_background_locked() {
+  pagesIdentical = false;
+  gr_color(0, 0, 0, 255);
+  gr_clear();
+  if (current_icon_ != NONE) {
+    if (max_stage != -1) {
+      int stage_height = gr_get_height(stage_marker_empty_.get());
+      int stage_width = gr_get_width(stage_marker_empty_.get());
+      int x = (ScreenWidth() - max_stage * gr_get_width(stage_marker_empty_.get())) / 2;
+      int y = ScreenHeight() - stage_height - margin_height_;
+      for (int i = 0; i < max_stage; ++i) {
+        const auto& stage_surface = (i < stage) ? stage_marker_fill_ : stage_marker_empty_;
+        DrawSurface(stage_surface.get(), 0, 0, stage_width, stage_height, x, y);
+        x += stage_width;
+      }
+    }
+
+    const auto& text_surface = GetCurrentText();
+    int text_x = (ScreenWidth() - gr_get_width(text_surface)) / 2;
+    int text_y = GetTextBaseline();
+    gr_color(255, 255, 255, 255);
+    DrawTextIcon(text_x, text_y, text_surface);
+  }
+}
+
+// Draws the animation and progress bar (if any) on the screen. Does not flip pages. Should only be
+// called with updateMutex locked.
+void ScreenRecoveryUI::draw_foreground_locked() {
+  if (current_icon_ != NONE) {
+    const auto& frame = GetCurrentFrame();
+    int frame_width = gr_get_width(frame);
+    int frame_height = gr_get_height(frame);
+    int frame_x = (ScreenWidth() - frame_width) / 2;
+    int frame_y = GetAnimationBaseline();
+    DrawSurface(frame, 0, 0, frame_width, frame_height, frame_x, frame_y);
+  }
+
+  if (progressBarType != EMPTY) {
+    int width = gr_get_width(progress_bar_empty_.get());
+    int height = gr_get_height(progress_bar_empty_.get());
+
+    int progress_x = (ScreenWidth() - width) / 2;
+    int progress_y = GetProgressBaseline();
+
+    // Erase behind the progress bar (in case this was a progress-only update)
+    gr_color(0, 0, 0, 255);
+    DrawFill(progress_x, progress_y, width, height);
+
+    if (progressBarType == DETERMINATE) {
+      float p = progressScopeStart + progress * progressScopeSize;
+      int pos = static_cast<int>(p * width);
+
+      if (rtl_locale_) {
+        // Fill the progress bar from right to left.
+        if (pos > 0) {
+          DrawSurface(progress_bar_fill_.get(), width - pos, 0, pos, height,
+                      progress_x + width - pos, progress_y);
+        }
+        if (pos < width - 1) {
+          DrawSurface(progress_bar_empty_.get(), 0, 0, width - pos, height, progress_x, progress_y);
+        }
+      } else {
+        // Fill the progress bar from left to right.
+        if (pos > 0) {
+          DrawSurface(progress_bar_fill_.get(), 0, 0, pos, height, progress_x, progress_y);
+        }
+        if (pos < width - 1) {
+          DrawSurface(progress_bar_empty_.get(), pos, 0, width - pos, height, progress_x + pos,
+                      progress_y);
+        }
+      }
+    }
+  }
+}
+
+void ScreenRecoveryUI::SetColor(UIElement e) const {
+  switch (e) {
+    case UIElement::INFO:
+      gr_color(249, 194, 0, 255);
+      break;
+    case UIElement::HEADER:
+      gr_color(247, 0, 6, 255);
+      break;
+    case UIElement::MENU:
+    case UIElement::MENU_SEL_BG:
+      gr_color(0, 106, 157, 255);
+      break;
+    case UIElement::MENU_SEL_BG_ACTIVE:
+      gr_color(0, 156, 100, 255);
+      break;
+    case UIElement::MENU_SEL_FG:
+      gr_color(255, 255, 255, 255);
+      break;
+    case UIElement::LOG:
+      gr_color(196, 196, 196, 255);
+      break;
+    case UIElement::TEXT_FILL:
+      gr_color(0, 0, 0, 160);
+      break;
+    default:
+      gr_color(255, 255, 255, 255);
+      break;
+  }
+}
+
+void ScreenRecoveryUI::SelectAndShowBackgroundText(const std::vector<std::string>& locales_entries,
+                                                   size_t sel) {
+  SetLocale(locales_entries[sel]);
+  std::vector<std::string> text_name = { "erasing_text", "error_text", "installing_text",
+                                         "installing_security_text", "no_command_text" };
+  std::unordered_map<std::string, std::unique_ptr<GRSurface>> surfaces;
+  for (const auto& name : text_name) {
+    auto text_image = LoadLocalizedBitmap(name);
+    if (!text_image) {
+      Print("Failed to load %s\n", name.c_str());
+      return;
+    }
+    surfaces.emplace(name, std::move(text_image));
+  }
+
+  std::lock_guard<std::mutex> lg(updateMutex);
+  gr_color(0, 0, 0, 255);
+  gr_clear();
+
+  int text_y = margin_height_;
+  int text_x = margin_width_;
+  int line_spacing = gr_sys_font()->char_height;  // Put some extra space between images.
+  // Write the header and descriptive texts.
+  SetColor(UIElement::INFO);
+  std::string header = "Show background text image";
+  text_y += DrawTextLine(text_x, text_y, header, true);
+  std::string locale_selection = android::base::StringPrintf(
+      "Current locale: %s, %zu/%zu", locales_entries[sel].c_str(), sel + 1, locales_entries.size());
+  // clang-format off
+  std::vector<std::string> instruction = {
+    locale_selection,
+    "Use volume up/down to switch locales and power to exit."
+  };
+  // clang-format on
+  text_y += DrawWrappedTextLines(text_x, text_y, instruction);
+
+  // Iterate through the text images and display them in order for the current locale.
+  for (const auto& p : surfaces) {
+    text_y += line_spacing;
+    SetColor(UIElement::LOG);
+    text_y += DrawTextLine(text_x, text_y, p.first, false);
+    gr_color(255, 255, 255, 255);
+    gr_texticon(text_x, text_y, p.second.get());
+    text_y += gr_get_height(p.second.get());
+  }
+  // Update the whole screen.
+  gr_flip();
+}
+
+void ScreenRecoveryUI::CheckBackgroundTextImages() {
+  // Load a list of locales embedded in one of the resource files.
+  std::vector<std::string> locales_entries = get_locales_in_png("installing_text");
+  if (locales_entries.empty()) {
+    Print("Failed to load locales from the resource files\n");
+    return;
+  }
+  std::string saved_locale = locale_;
+  size_t selected = 0;
+  SelectAndShowBackgroundText(locales_entries, selected);
+
+  FlushKeys();
+  while (true) {
+    int key = WaitKey();
+    if (key == static_cast<int>(KeyError::INTERRUPTED)) break;
+    if (key == KEY_POWER || key == KEY_ENTER) {
+      break;
+    } else if (key == KEY_UP || key == KEY_VOLUMEUP) {
+      selected = (selected == 0) ? locales_entries.size() - 1 : selected - 1;
+      SelectAndShowBackgroundText(locales_entries, selected);
+    } else if (key == KEY_DOWN || key == KEY_VOLUMEDOWN) {
+      selected = (selected == locales_entries.size() - 1) ? 0 : selected + 1;
+      SelectAndShowBackgroundText(locales_entries, selected);
+    }
+  }
+
+  SetLocale(saved_locale);
+}
+
+int ScreenRecoveryUI::ScreenWidth() const {
+  return gr_fb_width();
+}
+
+int ScreenRecoveryUI::ScreenHeight() const {
+  return gr_fb_height();
+}
+
+void ScreenRecoveryUI::DrawSurface(const GRSurface* surface, int sx, int sy, int w, int h, int dx,
+                                   int dy) const {
+  gr_blit(surface, sx, sy, w, h, dx, dy);
+}
+
+int ScreenRecoveryUI::DrawHorizontalRule(int y) const {
+  gr_fill(0, y + 4, ScreenWidth(), y + 6);
+  return 8;
+}
+
+void ScreenRecoveryUI::DrawHighlightBar(int x, int y, int width, int height) const {
+  gr_fill(x, y, x + width, y + height);
+}
+
+void ScreenRecoveryUI::DrawFill(int x, int y, int w, int h) const {
+  gr_fill(x, y, w, h);
+}
+
+void ScreenRecoveryUI::DrawTextIcon(int x, int y, const GRSurface* surface) const {
+  gr_texticon(x, y, surface);
+}
+
+int ScreenRecoveryUI::DrawTextLine(int x, int y, const std::string& line, bool bold) const {
+  gr_text(gr_sys_font(), x, y, line.c_str(), bold);
+  return char_height_ + 4;
+}
+
+int ScreenRecoveryUI::DrawTextLines(int x, int y, const std::vector<std::string>& lines) const {
+  int offset = 0;
+  for (const auto& line : lines) {
+    offset += DrawTextLine(x, y + offset, line, false);
+  }
+  return offset;
+}
+
+int ScreenRecoveryUI::DrawWrappedTextLines(int x, int y,
+                                           const std::vector<std::string>& lines) const {
+  // Keep symmetrical margins based on the given offset (i.e. x).
+  size_t text_cols = (ScreenWidth() - x * 2) / char_width_;
+  int offset = 0;
+  for (const auto& line : lines) {
+    size_t next_start = 0;
+    while (next_start < line.size()) {
+      std::string sub = line.substr(next_start, text_cols + 1);
+      if (sub.size() <= text_cols) {
+        next_start += sub.size();
+      } else {
+        // Line too long and must be wrapped to text_cols columns.
+        size_t last_space = sub.find_last_of(" \t\n");
+        if (last_space == std::string::npos) {
+          // No space found, just draw as much as we can.
+          sub.resize(text_cols);
+          next_start += text_cols;
+        } else {
+          sub.resize(last_space);
+          next_start += last_space + 1;
+        }
+      }
+      offset += DrawTextLine(x, y + offset, sub, false);
+    }
+  }
+  return offset;
+}
+
+void ScreenRecoveryUI::SetTitle(const std::vector<std::string>& lines) {
+  title_lines_ = lines;
+}
+
+// Redraws everything on the screen. Does not flip pages. Should only be called with updateMutex
+// locked.
+void ScreenRecoveryUI::draw_screen_locked() {
+  if (!show_text) {
+    draw_background_locked();
+    draw_foreground_locked();
+    return;
+  }
+
+  gr_color(0, 0, 0, 255);
+  gr_clear();
+
+  // clang-format off
+  static std::vector<std::string> REGULAR_HELP{
+    "Use volume up/down and power.",
+  };
+  static std::vector<std::string> LONG_PRESS_HELP{
+    "Any button cycles highlight.",
+    "Long-press activates.",
+  };
+  // clang-format on
+  draw_menu_and_text_buffer_locked(HasThreeButtons() ? REGULAR_HELP : LONG_PRESS_HELP);
+}
+
+// Draws the menu and text buffer on the screen. Should only be called with updateMutex locked.
+void ScreenRecoveryUI::draw_menu_and_text_buffer_locked(
+    const std::vector<std::string>& help_message) {
+  int y = margin_height_;
+
+  if (fastbootd_logo_ && fastbootd_logo_enabled_) {
+    // Try to get this centered on screen.
+    auto width = gr_get_width(fastbootd_logo_.get());
+    auto height = gr_get_height(fastbootd_logo_.get());
+    auto centered_x = ScreenWidth() / 2 - width / 2;
+    DrawSurface(fastbootd_logo_.get(), 0, 0, width, height, centered_x, y);
+    y += height;
+  }
+
+  if (menu_) {
+    int x = margin_width_ + kMenuIndent;
+
+    SetColor(UIElement::INFO);
+
+    for (size_t i = 0; i < title_lines_.size(); i++) {
+      y += DrawTextLine(x, y, title_lines_[i], i == 0);
+    }
+
+    y += DrawTextLines(x, y, help_message);
+
+    y += menu_->DrawHeader(x, y);
+    y += menu_->DrawItems(x, y, ScreenWidth(), IsLongPress());
+  }
+
+  // Display from the bottom up, until we hit the top of the screen, the bottom of the menu, or
+  // we've displayed the entire text buffer.
+  SetColor(UIElement::LOG);
+  int row = text_row_;
+  size_t count = 0;
+  for (int ty = ScreenHeight() - margin_height_ - char_height_; ty >= y && count < text_rows_;
+       ty -= char_height_, ++count) {
+    DrawTextLine(margin_width_, ty, text_[row], false);
+    --row;
+    if (row < 0) row = text_rows_ - 1;
+  }
+}
+
+// Redraw everything on the screen and flip the screen (make it visible).
+// Should only be called with updateMutex locked.
+void ScreenRecoveryUI::update_screen_locked() {
+  draw_screen_locked();
+  gr_flip();
+}
+
+// Updates only the progress bar, if possible, otherwise redraws the screen.
+// Should only be called with updateMutex locked.
+void ScreenRecoveryUI::update_progress_locked() {
+  if (show_text || !pagesIdentical) {
+    draw_screen_locked();  // Must redraw the whole screen
+    pagesIdentical = true;
+  } else {
+    draw_foreground_locked();  // Draw only the progress bar and overlays
+  }
+  gr_flip();
+}
+
+void ScreenRecoveryUI::ProgressThreadLoop() {
+  double interval = 1.0 / animation_fps_;
+  while (!progress_thread_stopped_) {
+    double start = now();
+    bool redraw = false;
+    {
+      std::lock_guard<std::mutex> lg(updateMutex);
+
+      // update the installation animation, if active
+      // skip this if we have a text overlay (too expensive to update)
+      if ((current_icon_ == INSTALLING_UPDATE || current_icon_ == ERASING) && !show_text) {
+        if (!intro_done_) {
+          if (current_frame_ == intro_frames_.size() - 1) {
+            intro_done_ = true;
+            current_frame_ = 0;
+          } else {
+            ++current_frame_;
+          }
+        } else {
+          current_frame_ = (current_frame_ + 1) % loop_frames_.size();
+        }
+
+        redraw = true;
+      }
+
+      // move the progress bar forward on timed intervals, if configured
+      int duration = progressScopeDuration;
+      if (progressBarType == DETERMINATE && duration > 0) {
+        double elapsed = now() - progressScopeTime;
+        float p = 1.0 * elapsed / duration;
+        if (p > 1.0) p = 1.0;
+        if (p > progress) {
+          progress = p;
+          redraw = true;
+        }
+      }
+
+      if (redraw) update_progress_locked();
+    }
+
+    double end = now();
+    // minimum of 20ms delay between frames
+    double delay = interval - (end - start);
+    if (delay < 0.02) delay = 0.02;
+    usleep(static_cast<useconds_t>(delay * 1000000));
+  }
+}
+
+std::unique_ptr<GRSurface> ScreenRecoveryUI::LoadBitmap(const std::string& filename) {
+  GRSurface* surface;
+  if (auto result = res_create_display_surface(filename.c_str(), &surface); result < 0) {
+    LOG(ERROR) << "Failed to load bitmap " << filename << " (error " << result << ")";
+    return nullptr;
+  }
+  return std::unique_ptr<GRSurface>(surface);
+}
+
+std::unique_ptr<GRSurface> ScreenRecoveryUI::LoadLocalizedBitmap(const std::string& filename) {
+  GRSurface* surface;
+  if (auto result = res_create_localized_alpha_surface(filename.c_str(), locale_.c_str(), &surface);
+      result < 0) {
+    LOG(ERROR) << "Failed to load bitmap " << filename << " (error " << result << ")";
+    return nullptr;
+  }
+  return std::unique_ptr<GRSurface>(surface);
+}
+
+static char** Alloc2d(size_t rows, size_t cols) {
+  char** result = new char*[rows];
+  for (size_t i = 0; i < rows; ++i) {
+    result[i] = new char[cols];
+    memset(result[i], 0, cols);
+  }
+  return result;
+}
+
+// Choose the right background string to display during update.
+void ScreenRecoveryUI::SetSystemUpdateText(bool security_update) {
+  if (security_update) {
+    installing_text_ = LoadLocalizedBitmap("installing_security_text");
+  } else {
+    installing_text_ = LoadLocalizedBitmap("installing_text");
+  }
+  Redraw();
+}
+
+bool ScreenRecoveryUI::InitTextParams() {
+  // gr_init() would return successfully on font initialization failure.
+  if (gr_sys_font() == nullptr) {
+    return false;
+  }
+  gr_font_size(gr_sys_font(), &char_width_, &char_height_);
+  text_rows_ = (ScreenHeight() - margin_height_ * 2) / char_height_;
+  text_cols_ = (ScreenWidth() - margin_width_ * 2) / char_width_;
+  return true;
+}
+
+bool ScreenRecoveryUI::LoadWipeDataMenuText() {
+  // Ignores the errors since the member variables will stay as nullptr.
+  cancel_wipe_data_text_ = LoadLocalizedBitmap("cancel_wipe_data_text");
+  factory_data_reset_text_ = LoadLocalizedBitmap("factory_data_reset_text");
+  try_again_text_ = LoadLocalizedBitmap("try_again_text");
+  wipe_data_confirmation_text_ = LoadLocalizedBitmap("wipe_data_confirmation_text");
+  wipe_data_menu_header_text_ = LoadLocalizedBitmap("wipe_data_menu_header_text");
+  return true;
+}
+
+bool ScreenRecoveryUI::Init(const std::string& locale) {
+  RecoveryUI::Init(locale);
+
+  if (gr_init() == -1) {
+    return false;
+  }
+
+  if (!InitTextParams()) {
+    return false;
+  }
+
+  // Are we portrait or landscape?
+  layout_ = (gr_fb_width() > gr_fb_height()) ? LANDSCAPE : PORTRAIT;
+  // Are we the large variant of our base layout?
+  if (gr_fb_height() > PixelsFromDp(800)) ++layout_;
+
+  text_ = Alloc2d(text_rows_, text_cols_ + 1);
+  file_viewer_text_ = Alloc2d(text_rows_, text_cols_ + 1);
+
+  text_col_ = text_row_ = 0;
+
+  // Set up the locale info.
+  SetLocale(locale);
+
+  error_icon_ = LoadBitmap("icon_error");
+
+  progress_bar_empty_ = LoadBitmap("progress_empty");
+  progress_bar_fill_ = LoadBitmap("progress_fill");
+  stage_marker_empty_ = LoadBitmap("stage_empty");
+  stage_marker_fill_ = LoadBitmap("stage_fill");
+
+  erasing_text_ = LoadLocalizedBitmap("erasing_text");
+  no_command_text_ = LoadLocalizedBitmap("no_command_text");
+  error_text_ = LoadLocalizedBitmap("error_text");
+
+  if (android::base::GetBoolProperty("ro.boot.dynamic_partitions", false)) {
+    fastbootd_logo_ = LoadBitmap("fastbootd");
+  }
+
+  // Background text for "installing_update" could be "installing update" or
+  // "installing security update". It will be set after Init() according to the commands in BCB.
+  installing_text_.reset();
+
+  LoadWipeDataMenuText();
+
+  LoadAnimation();
+
+  // Keep the progress bar updated, even when the process is otherwise busy.
+  progress_thread_ = std::thread(&ScreenRecoveryUI::ProgressThreadLoop, this);
+
+  return true;
+}
+
+std::string ScreenRecoveryUI::GetLocale() const {
+  return locale_;
+}
+
+void ScreenRecoveryUI::LoadAnimation() {
+  std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(Paths::Get().resource_dir().c_str()),
+                                                closedir);
+  dirent* de;
+  std::vector<std::string> intro_frame_names;
+  std::vector<std::string> loop_frame_names;
+
+  while ((de = readdir(dir.get())) != nullptr) {
+    int value, num_chars;
+    if (sscanf(de->d_name, "intro%d%n.png", &value, &num_chars) == 1) {
+      intro_frame_names.emplace_back(de->d_name, num_chars);
+    } else if (sscanf(de->d_name, "loop%d%n.png", &value, &num_chars) == 1) {
+      loop_frame_names.emplace_back(de->d_name, num_chars);
+    }
+  }
+
+  size_t intro_frames = intro_frame_names.size();
+  size_t loop_frames = loop_frame_names.size();
+
+  // It's okay to not have an intro.
+  if (intro_frames == 0) intro_done_ = true;
+  // But you must have an animation.
+  if (loop_frames == 0) abort();
+
+  std::sort(intro_frame_names.begin(), intro_frame_names.end());
+  std::sort(loop_frame_names.begin(), loop_frame_names.end());
+
+  intro_frames_.clear();
+  intro_frames_.reserve(intro_frames);
+  for (const auto& frame_name : intro_frame_names) {
+    intro_frames_.emplace_back(LoadBitmap(frame_name));
+  }
+
+  loop_frames_.clear();
+  loop_frames_.reserve(loop_frames);
+  for (const auto& frame_name : loop_frame_names) {
+    loop_frames_.emplace_back(LoadBitmap(frame_name));
+  }
+}
+
+void ScreenRecoveryUI::SetBackground(Icon icon) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+
+  current_icon_ = icon;
+  update_screen_locked();
+}
+
+void ScreenRecoveryUI::SetProgressType(ProgressType type) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  if (progressBarType != type) {
+    progressBarType = type;
+  }
+  progressScopeStart = 0;
+  progressScopeSize = 0;
+  progress = 0;
+  update_progress_locked();
+}
+
+void ScreenRecoveryUI::ShowProgress(float portion, float seconds) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  progressBarType = DETERMINATE;
+  progressScopeStart += progressScopeSize;
+  progressScopeSize = portion;
+  progressScopeTime = now();
+  progressScopeDuration = seconds;
+  progress = 0;
+  update_progress_locked();
+}
+
+void ScreenRecoveryUI::SetProgress(float fraction) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  if (fraction < 0.0) fraction = 0.0;
+  if (fraction > 1.0) fraction = 1.0;
+  if (progressBarType == DETERMINATE && fraction > progress) {
+    // Skip updates that aren't visibly different.
+    int width = gr_get_width(progress_bar_empty_.get());
+    float scale = width * progressScopeSize;
+    if ((int)(progress * scale) != (int)(fraction * scale)) {
+      progress = fraction;
+      update_progress_locked();
+    }
+  }
+}
+
+void ScreenRecoveryUI::SetStage(int current, int max) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  stage = current;
+  max_stage = max;
+}
+
+void ScreenRecoveryUI::PrintV(const char* fmt, bool copy_to_stdout, va_list ap) {
+  std::string str;
+  android::base::StringAppendV(&str, fmt, ap);
+
+  if (copy_to_stdout) {
+    fputs(str.c_str(), stdout);
+  }
+
+  std::lock_guard<std::mutex> lg(updateMutex);
+  if (text_rows_ > 0 && text_cols_ > 0) {
+    for (const char* ptr = str.c_str(); *ptr != '\0'; ++ptr) {
+      if (*ptr == '\n' || text_col_ >= text_cols_) {
+        text_[text_row_][text_col_] = '\0';
+        text_col_ = 0;
+        text_row_ = (text_row_ + 1) % text_rows_;
+      }
+      if (*ptr != '\n') text_[text_row_][text_col_++] = *ptr;
+    }
+    text_[text_row_][text_col_] = '\0';
+    update_screen_locked();
+  }
+}
+
+void ScreenRecoveryUI::Print(const char* fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  PrintV(fmt, true, ap);
+  va_end(ap);
+}
+
+void ScreenRecoveryUI::PrintOnScreenOnly(const char* fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  PrintV(fmt, false, ap);
+  va_end(ap);
+}
+
+void ScreenRecoveryUI::PutChar(char ch) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  if (ch != '\n') text_[text_row_][text_col_++] = ch;
+  if (ch == '\n' || text_col_ >= text_cols_) {
+    text_col_ = 0;
+    ++text_row_;
+  }
+}
+
+void ScreenRecoveryUI::ClearText() {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  text_col_ = 0;
+  text_row_ = 0;
+  for (size_t i = 0; i < text_rows_; ++i) {
+    memset(text_[i], 0, text_cols_ + 1);
+  }
+}
+
+void ScreenRecoveryUI::ShowFile(FILE* fp) {
+  std::vector<off_t> offsets;
+  offsets.push_back(ftello(fp));
+  ClearText();
+
+  struct stat sb;
+  fstat(fileno(fp), &sb);
+
+  bool show_prompt = false;
+  while (true) {
+    if (show_prompt) {
+      PrintOnScreenOnly("--(%d%% of %d bytes)--",
+                        static_cast<int>(100 * (double(ftello(fp)) / double(sb.st_size))),
+                        static_cast<int>(sb.st_size));
+      Redraw();
+      while (show_prompt) {
+        show_prompt = false;
+        int key = WaitKey();
+        if (key == static_cast<int>(KeyError::INTERRUPTED)) return;
+        if (key == KEY_POWER || key == KEY_ENTER) {
+          return;
+        } else if (key == KEY_UP || key == KEY_VOLUMEUP) {
+          if (offsets.size() <= 1) {
+            show_prompt = true;
+          } else {
+            offsets.pop_back();
+            fseek(fp, offsets.back(), SEEK_SET);
+          }
+        } else {
+          if (feof(fp)) {
+            return;
+          }
+          offsets.push_back(ftello(fp));
+        }
+      }
+      ClearText();
+    }
+
+    int ch = getc(fp);
+    if (ch == EOF) {
+      while (text_row_ < text_rows_ - 1) PutChar('\n');
+      show_prompt = true;
+    } else {
+      PutChar(ch);
+      if (text_col_ == 0 && text_row_ >= text_rows_ - 1) {
+        show_prompt = true;
+      }
+    }
+  }
+}
+
+void ScreenRecoveryUI::ShowFile(const std::string& filename) {
+  std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(filename.c_str(), "re"), fclose);
+  if (!fp) {
+    Print("  Unable to open %s: %s\n", filename.c_str(), strerror(errno));
+    return;
+  }
+
+  char** old_text = text_;
+  size_t old_text_col = text_col_;
+  size_t old_text_row = text_row_;
+
+  // Swap in the alternate screen and clear it.
+  text_ = file_viewer_text_;
+  ClearText();
+
+  ShowFile(fp.get());
+
+  text_ = old_text;
+  text_col_ = old_text_col;
+  text_row_ = old_text_row;
+}
+
+std::unique_ptr<Menu> ScreenRecoveryUI::CreateMenu(
+    const GRSurface* graphic_header, const std::vector<const GRSurface*>& graphic_items,
+    const std::vector<std::string>& text_headers, const std::vector<std::string>& text_items,
+    size_t initial_selection) const {
+  // horizontal unusable area: margin width + menu indent
+  size_t max_width = ScreenWidth() - margin_width_ - kMenuIndent;
+  // vertical unusable area: margin height + title lines + helper message + high light bar.
+  // It is safe to reserve more space.
+  size_t max_height = ScreenHeight() - margin_height_ - char_height_ * (title_lines_.size() + 3);
+  if (GraphicMenu::Validate(max_width, max_height, graphic_header, graphic_items)) {
+    return std::make_unique<GraphicMenu>(graphic_header, graphic_items, initial_selection, *this);
+  }
+
+  fprintf(stderr, "Failed to initialize graphic menu, falling back to use the text menu.\n");
+
+  return CreateMenu(text_headers, text_items, initial_selection);
+}
+
+std::unique_ptr<Menu> ScreenRecoveryUI::CreateMenu(const std::vector<std::string>& text_headers,
+                                                   const std::vector<std::string>& text_items,
+                                                   size_t initial_selection) const {
+  if (text_rows_ > 0 && text_cols_ > 1) {
+    return std::make_unique<TextMenu>(scrollable_menu_, text_rows_, text_cols_ - 1, text_headers,
+                                      text_items, initial_selection, char_height_, *this);
+  }
+
+  fprintf(stderr, "Failed to create text menu, text_rows %zu, text_cols %zu.\n", text_rows_,
+          text_cols_);
+  return nullptr;
+}
+
+int ScreenRecoveryUI::SelectMenu(int sel) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  if (menu_) {
+    int old_sel = menu_->selection();
+    sel = menu_->Select(sel);
+
+    if (sel != old_sel) {
+      update_screen_locked();
+    }
+  }
+  return sel;
+}
+
+size_t ScreenRecoveryUI::ShowMenu(std::unique_ptr<Menu>&& menu, bool menu_only,
+                                  const std::function<int(int, bool)>& key_handler) {
+  // Throw away keys pressed previously, so user doesn't accidentally trigger menu items.
+  FlushKeys();
+
+  // If there is a key interrupt in progress, return KeyError::INTERRUPTED without starting the
+  // menu.
+  if (IsKeyInterrupted()) return static_cast<size_t>(KeyError::INTERRUPTED);
+
+  CHECK(menu != nullptr);
+
+  // Starts and displays the menu
+  menu_ = std::move(menu);
+  Redraw();
+
+  int selected = menu_->selection();
+  int chosen_item = -1;
+  while (chosen_item < 0) {
+    int key = WaitKey();
+    if (key == static_cast<int>(KeyError::INTERRUPTED)) {  // WaitKey() was interrupted.
+      return static_cast<size_t>(KeyError::INTERRUPTED);
+    }
+    if (key == static_cast<int>(KeyError::TIMED_OUT)) {  // WaitKey() timed out.
+      if (WasTextEverVisible()) {
+        continue;
+      } else {
+        LOG(INFO) << "Timed out waiting for key input; rebooting.";
+        menu_.reset();
+        Redraw();
+        return static_cast<size_t>(KeyError::TIMED_OUT);
+      }
+    }
+
+    bool visible = IsTextVisible();
+    int action = key_handler(key, visible);
+    if (action < 0) {
+      switch (action) {
+        case Device::kHighlightUp:
+          selected = SelectMenu(--selected);
+          break;
+        case Device::kHighlightDown:
+          selected = SelectMenu(++selected);
+          break;
+        case Device::kInvokeItem:
+          chosen_item = selected;
+          break;
+        case Device::kNoAction:
+          break;
+      }
+    } else if (!menu_only) {
+      chosen_item = action;
+    }
+  }
+
+  menu_.reset();
+  Redraw();
+
+  return chosen_item;
+}
+
+size_t ScreenRecoveryUI::ShowMenu(const std::vector<std::string>& headers,
+                                  const std::vector<std::string>& items, size_t initial_selection,
+                                  bool menu_only,
+                                  const std::function<int(int, bool)>& key_handler) {
+  auto menu = CreateMenu(headers, items, initial_selection);
+  if (menu == nullptr) {
+    return initial_selection;
+  }
+
+  return ShowMenu(CreateMenu(headers, items, initial_selection), menu_only, key_handler);
+}
+
+size_t ScreenRecoveryUI::ShowPromptWipeDataMenu(const std::vector<std::string>& backup_headers,
+                                                const std::vector<std::string>& backup_items,
+                                                const std::function<int(int, bool)>& key_handler) {
+  auto wipe_data_menu = CreateMenu(wipe_data_menu_header_text_.get(),
+                                   { try_again_text_.get(), factory_data_reset_text_.get() },
+                                   backup_headers, backup_items, 0);
+  if (wipe_data_menu == nullptr) {
+    return 0;
+  }
+
+  return ShowMenu(std::move(wipe_data_menu), true, key_handler);
+}
+
+size_t ScreenRecoveryUI::ShowPromptWipeDataConfirmationMenu(
+    const std::vector<std::string>& backup_headers, const std::vector<std::string>& backup_items,
+    const std::function<int(int, bool)>& key_handler) {
+  auto confirmation_menu =
+      CreateMenu(wipe_data_confirmation_text_.get(),
+                 { cancel_wipe_data_text_.get(), factory_data_reset_text_.get() }, backup_headers,
+                 backup_items, 0);
+  if (confirmation_menu == nullptr) {
+    return 0;
+  }
+
+  return ShowMenu(std::move(confirmation_menu), true, key_handler);
+}
+
+bool ScreenRecoveryUI::IsTextVisible() {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  int visible = show_text;
+  return visible;
+}
+
+bool ScreenRecoveryUI::WasTextEverVisible() {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  int ever_visible = show_text_ever;
+  return ever_visible;
+}
+
+void ScreenRecoveryUI::ShowText(bool visible) {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  show_text = visible;
+  if (show_text) show_text_ever = true;
+  update_screen_locked();
+}
+
+void ScreenRecoveryUI::Redraw() {
+  std::lock_guard<std::mutex> lg(updateMutex);
+  update_screen_locked();
+}
+
+void ScreenRecoveryUI::KeyLongPress(int) {
+  // Redraw so that if we're in the menu, the highlight
+  // will change color to indicate a successful long press.
+  Redraw();
+}
+
+void ScreenRecoveryUI::SetLocale(const std::string& new_locale) {
+  locale_ = new_locale;
+  rtl_locale_ = false;
+
+  if (!new_locale.empty()) {
+    size_t separator = new_locale.find('-');
+    // lang has the language prefix prior to the separator, or full string if none exists.
+    std::string lang = new_locale.substr(0, separator);
+
+    // A bit cheesy: keep an explicit list of supported RTL languages.
+    if (lang == "ar" ||  // Arabic
+        lang == "fa" ||  // Persian (Farsi)
+        lang == "he" ||  // Hebrew (new language code)
+        lang == "iw" ||  // Hebrew (old language code)
+        lang == "ur") {  // Urdu
+      rtl_locale_ = true;
+    }
+  }
+}
diff --git a/recovery_ui/ui.cpp b/recovery_ui/ui.cpp
new file mode 100644
index 000000000..b7107ff21
--- /dev/null
+++ b/recovery_ui/ui.cpp
@@ -0,0 +1,597 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/ui.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <chrono>
+#include <functional>
+#include <string>
+#include <thread>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+
+#include "minui/minui.h"
+#include "otautil/sysutil.h"
+
+using namespace std::chrono_literals;
+
+constexpr int UI_WAIT_KEY_TIMEOUT_SEC = 120;
+constexpr const char* BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/brightness";
+constexpr const char* MAX_BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/max_brightness";
+constexpr const char* BRIGHTNESS_FILE_SDM = "/sys/class/backlight/panel0-backlight/brightness";
+constexpr const char* MAX_BRIGHTNESS_FILE_SDM =
+    "/sys/class/backlight/panel0-backlight/max_brightness";
+
+constexpr int kDefaultTouchLowThreshold = 50;
+constexpr int kDefaultTouchHighThreshold = 90;
+
+RecoveryUI::RecoveryUI()
+    : brightness_normal_(50),
+      brightness_dimmed_(25),
+      brightness_file_(BRIGHTNESS_FILE),
+      max_brightness_file_(MAX_BRIGHTNESS_FILE),
+      touch_screen_allowed_(false),
+      fastbootd_logo_enabled_(false),
+      touch_low_threshold_(android::base::GetIntProperty("ro.recovery.ui.touch_low_threshold",
+                                                         kDefaultTouchLowThreshold)),
+      touch_high_threshold_(android::base::GetIntProperty("ro.recovery.ui.touch_high_threshold",
+                                                          kDefaultTouchHighThreshold)),
+      key_interrupted_(false),
+      key_queue_len(0),
+      key_last_down(-1),
+      key_long_press(false),
+      key_down_count(0),
+      enable_reboot(true),
+      consecutive_power_keys(0),
+      last_key(-1),
+      has_power_key(false),
+      has_up_key(false),
+      has_down_key(false),
+      has_touch_screen(false),
+      touch_slot_(0),
+      is_bootreason_recovery_ui_(false),
+      screensaver_state_(ScreensaverState::DISABLED) {
+  memset(key_pressed, 0, sizeof(key_pressed));
+}
+
+RecoveryUI::~RecoveryUI() {
+  ev_exit();
+  input_thread_stopped_ = true;
+  if (input_thread_.joinable()) {
+    input_thread_.join();
+  }
+}
+
+void RecoveryUI::OnKeyDetected(int key_code) {
+  if (key_code == KEY_POWER) {
+    has_power_key = true;
+  } else if (key_code == KEY_DOWN || key_code == KEY_VOLUMEDOWN) {
+    has_down_key = true;
+  } else if (key_code == KEY_UP || key_code == KEY_VOLUMEUP) {
+    has_up_key = true;
+  } else if (key_code == ABS_MT_POSITION_X || key_code == ABS_MT_POSITION_Y) {
+    has_touch_screen = true;
+  }
+}
+
+bool RecoveryUI::InitScreensaver() {
+  // Disabled.
+  if (brightness_normal_ == 0 || brightness_dimmed_ > brightness_normal_) {
+    return false;
+  }
+  if (access(brightness_file_.c_str(), R_OK | W_OK)) {
+    brightness_file_ = BRIGHTNESS_FILE_SDM;
+  }
+  if (access(max_brightness_file_.c_str(), R_OK)) {
+    max_brightness_file_ = MAX_BRIGHTNESS_FILE_SDM;
+  }
+  // Set the initial brightness level based on the max brightness. Note that reading the initial
+  // value from BRIGHTNESS_FILE doesn't give the actual brightness value (bullhead, sailfish), so
+  // we don't have a good way to query the default value.
+  std::string content;
+  if (!android::base::ReadFileToString(max_brightness_file_, &content)) {
+    PLOG(WARNING) << "Failed to read max brightness";
+    return false;
+  }
+
+  unsigned int max_value;
+  if (!android::base::ParseUint(android::base::Trim(content), &max_value)) {
+    LOG(WARNING) << "Failed to parse max brightness: " << content;
+    return false;
+  }
+
+  brightness_normal_value_ = max_value * brightness_normal_ / 100.0;
+  brightness_dimmed_value_ = max_value * brightness_dimmed_ / 100.0;
+  if (!android::base::WriteStringToFile(std::to_string(brightness_normal_value_),
+                                        brightness_file_)) {
+    PLOG(WARNING) << "Failed to set brightness";
+    return false;
+  }
+
+  LOG(INFO) << "Brightness: " << brightness_normal_value_ << " (" << brightness_normal_ << "%)";
+  screensaver_state_ = ScreensaverState::NORMAL;
+  return true;
+}
+
+bool RecoveryUI::Init(const std::string& /* locale */) {
+  ev_init(std::bind(&RecoveryUI::OnInputEvent, this, std::placeholders::_1, std::placeholders::_2),
+          touch_screen_allowed_);
+
+  ev_iterate_available_keys(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));
+
+  if (touch_screen_allowed_) {
+    ev_iterate_touch_inputs(std::bind(&RecoveryUI::OnKeyDetected, this, std::placeholders::_1));
+
+    // Parse /proc/cmdline to determine if it's booting into recovery with a bootreason of
+    // "recovery_ui". This specific reason is set by some (wear) bootloaders, to allow an easier way
+    // to turn on text mode. It will only be set if the recovery boot is triggered from fastboot, or
+    // with 'adb reboot recovery'. Note that this applies to all build variants. Otherwise the text
+    // mode will be turned on automatically on debuggable builds, even without a swipe.
+    std::string cmdline;
+    if (android::base::ReadFileToString("/proc/cmdline", &cmdline)) {
+      is_bootreason_recovery_ui_ = cmdline.find("bootreason=recovery_ui") != std::string::npos;
+    } else {
+      // Non-fatal, and won't affect Init() result.
+      PLOG(WARNING) << "Failed to read /proc/cmdline";
+    }
+  }
+
+  if (!InitScreensaver()) {
+    LOG(INFO) << "Screensaver disabled";
+  }
+
+  // Create a separate thread that handles input events.
+  input_thread_ = std::thread([this]() {
+    while (!this->input_thread_stopped_) {
+      if (!ev_wait(500)) {
+        ev_dispatch();
+      }
+    }
+  });
+
+  return true;
+}
+
+void RecoveryUI::OnTouchDetected(int dx, int dy) {
+  enum SwipeDirection { UP, DOWN, RIGHT, LEFT } direction;
+
+  // We only consider a valid swipe if:
+  // - the delta along one axis is below touch_low_threshold_;
+  // - and the delta along the other axis is beyond touch_high_threshold_.
+  if (abs(dy) < touch_low_threshold_ && abs(dx) > touch_high_threshold_) {
+    direction = dx < 0 ? SwipeDirection::LEFT : SwipeDirection::RIGHT;
+  } else if (abs(dx) < touch_low_threshold_ && abs(dy) > touch_high_threshold_) {
+    direction = dy < 0 ? SwipeDirection::UP : SwipeDirection::DOWN;
+  } else {
+    LOG(DEBUG) << "Ignored " << dx << " " << dy << " (low: " << touch_low_threshold_
+               << ", high: " << touch_high_threshold_ << ")";
+    return;
+  }
+
+  // Allow turning on text mode with any swipe, if bootloader has set a bootreason of recovery_ui.
+  if (is_bootreason_recovery_ui_ && !IsTextVisible()) {
+    ShowText(true);
+    return;
+  }
+
+  LOG(DEBUG) << "Swipe direction=" << direction;
+  switch (direction) {
+    case SwipeDirection::UP:
+      ProcessKey(KEY_UP, 1);  // press up key
+      ProcessKey(KEY_UP, 0);  // and release it
+      break;
+
+    case SwipeDirection::DOWN:
+      ProcessKey(KEY_DOWN, 1);  // press down key
+      ProcessKey(KEY_DOWN, 0);  // and release it
+      break;
+
+    case SwipeDirection::LEFT:
+    case SwipeDirection::RIGHT:
+      ProcessKey(KEY_POWER, 1);  // press power key
+      ProcessKey(KEY_POWER, 0);  // and release it
+      break;
+  };
+}
+
+int RecoveryUI::OnInputEvent(int fd, uint32_t epevents) {
+  struct input_event ev;
+  if (ev_get_input(fd, epevents, &ev) == -1) {
+    return -1;
+  }
+
+  // Touch inputs handling.
+  //
+  // We handle the touch inputs by tracking the position changes between initial contacting and
+  // upon lifting. touch_start_X/Y record the initial positions, with touch_finger_down set. Upon
+  // detecting the lift, we unset touch_finger_down and detect a swipe based on position changes.
+  //
+  // Per the doc Multi-touch Protocol at below, there are two protocols.
+  // https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
+  //
+  // The main difference between the stateless type A protocol and the stateful type B slot protocol
+  // lies in the usage of identifiable contacts to reduce the amount of data sent to userspace. The
+  // slot protocol (i.e. type B) sends ABS_MT_TRACKING_ID with a unique id on initial contact, and
+  // sends ABS_MT_TRACKING_ID -1 upon lifting the contact. Protocol A doesn't send
+  // ABS_MT_TRACKING_ID -1 on lifting, but the driver may additionally report BTN_TOUCH event.
+  //
+  // For protocol A, we rely on BTN_TOUCH to recognize lifting, while for protocol B we look for
+  // ABS_MT_TRACKING_ID being -1.
+  //
+  // Touch input events will only be available if touch_screen_allowed_ is set.
+
+  if (ev.type == EV_SYN) {
+    if (touch_screen_allowed_ && ev.code == SYN_REPORT) {
+      // There might be multiple SYN_REPORT events. We should only detect a swipe after lifting the
+      // contact.
+      if (touch_finger_down_ && !touch_swiping_) {
+        touch_start_X_ = touch_X_;
+        touch_start_Y_ = touch_Y_;
+        touch_swiping_ = true;
+      } else if (!touch_finger_down_ && touch_swiping_) {
+        touch_swiping_ = false;
+        OnTouchDetected(touch_X_ - touch_start_X_, touch_Y_ - touch_start_Y_);
+      }
+    }
+    return 0;
+  }
+
+  if (ev.type == EV_REL) {
+    if (ev.code == REL_Y) {
+      // accumulate the up or down motion reported by
+      // the trackball.  When it exceeds a threshold
+      // (positive or negative), fake an up/down
+      // key event.
+      rel_sum += ev.value;
+      if (rel_sum > 3) {
+        ProcessKey(KEY_DOWN, 1);  // press down key
+        ProcessKey(KEY_DOWN, 0);  // and release it
+        rel_sum = 0;
+      } else if (rel_sum < -3) {
+        ProcessKey(KEY_UP, 1);  // press up key
+        ProcessKey(KEY_UP, 0);  // and release it
+        rel_sum = 0;
+      }
+    }
+  } else {
+    rel_sum = 0;
+  }
+
+  if (touch_screen_allowed_ && ev.type == EV_ABS) {
+    if (ev.code == ABS_MT_SLOT) {
+      touch_slot_ = ev.value;
+    }
+    // Ignore other fingers.
+    if (touch_slot_ > 0) return 0;
+
+    switch (ev.code) {
+      case ABS_MT_POSITION_X:
+        touch_X_ = ev.value;
+        touch_finger_down_ = true;
+        break;
+
+      case ABS_MT_POSITION_Y:
+        touch_Y_ = ev.value;
+        touch_finger_down_ = true;
+        break;
+
+      case ABS_MT_TRACKING_ID:
+        // Protocol B: -1 marks lifting the contact.
+        if (ev.value < 0) touch_finger_down_ = false;
+        break;
+    }
+    return 0;
+  }
+
+  if (ev.type == EV_KEY && ev.code <= KEY_MAX) {
+    if (touch_screen_allowed_) {
+      if (ev.code == BTN_TOUCH) {
+        // A BTN_TOUCH with value 1 indicates the start of contact (protocol A), with 0 means
+        // lifting the contact.
+        touch_finger_down_ = (ev.value == 1);
+      }
+
+      // Intentionally ignore BTN_TOUCH and BTN_TOOL_FINGER, which would otherwise trigger
+      // additional scrolling (because in ScreenRecoveryUI::ShowFile(), we consider keys other than
+      // KEY_POWER and KEY_UP as KEY_DOWN).
+      if (ev.code == BTN_TOUCH || ev.code == BTN_TOOL_FINGER) {
+        return 0;
+      }
+    }
+
+    ProcessKey(ev.code, ev.value);
+  }
+
+  return 0;
+}
+
+// Processes a key-up or -down event. A key is "registered" when it is pressed and then released,
+// with no other keypresses or releases in between. Registered keys are passed to CheckKey() to
+// see if it should trigger a visibility toggle, an immediate reboot, or be queued to be processed
+// next time the foreground thread wants a key (eg, for the menu).
+//
+// We also keep track of which keys are currently down so that CheckKey() can call IsKeyPressed()
+// to see what other keys are held when a key is registered.
+//
+// updown == 1 for key down events; 0 for key up events
+void RecoveryUI::ProcessKey(int key_code, int updown) {
+  bool register_key = false;
+  bool long_press = false;
+
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    key_pressed[key_code] = updown;
+    if (updown) {
+      ++key_down_count;
+      key_last_down = key_code;
+      key_long_press = false;
+      std::thread time_key_thread(&RecoveryUI::TimeKey, this, key_code, key_down_count);
+      time_key_thread.detach();
+    } else {
+      if (key_last_down == key_code) {
+        long_press = key_long_press;
+        register_key = true;
+      }
+      key_last_down = -1;
+    }
+  }
+
+  bool reboot_enabled = enable_reboot;
+  if (register_key) {
+    switch (CheckKey(key_code, long_press)) {
+      case RecoveryUI::IGNORE:
+        break;
+
+      case RecoveryUI::TOGGLE:
+        ShowText(!IsTextVisible());
+        break;
+
+      case RecoveryUI::REBOOT:
+        if (reboot_enabled) {
+          reboot("reboot,");
+          while (true) {
+            pause();
+          }
+        }
+        break;
+
+      case RecoveryUI::ENQUEUE:
+        EnqueueKey(key_code);
+        break;
+    }
+  }
+}
+
+void RecoveryUI::TimeKey(int key_code, int count) {
+  std::this_thread::sleep_for(750ms);  // 750 ms == "long"
+  bool long_press = false;
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    if (key_last_down == key_code && key_down_count == count) {
+      long_press = key_long_press = true;
+    }
+  }
+  if (long_press) KeyLongPress(key_code);
+}
+
+void RecoveryUI::EnqueueKey(int key_code) {
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
+  const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
+  if (key_queue_len < queue_max) {
+    key_queue[key_queue_len++] = key_code;
+    key_queue_cond.notify_one();
+  }
+}
+
+void RecoveryUI::SetScreensaverState(ScreensaverState state) {
+  switch (state) {
+    case ScreensaverState::NORMAL:
+      if (android::base::WriteStringToFile(std::to_string(brightness_normal_value_),
+                                           brightness_file_)) {
+        screensaver_state_ = ScreensaverState::NORMAL;
+        LOG(INFO) << "Brightness: " << brightness_normal_value_ << " (" << brightness_normal_
+                  << "%)";
+      } else {
+        LOG(ERROR) << "Unable to set brightness to normal";
+      }
+      break;
+    case ScreensaverState::DIMMED:
+      if (android::base::WriteStringToFile(std::to_string(brightness_dimmed_value_),
+                                           brightness_file_)) {
+        LOG(INFO) << "Brightness: " << brightness_dimmed_value_ << " (" << brightness_dimmed_
+                  << "%)";
+        screensaver_state_ = ScreensaverState::DIMMED;
+      } else {
+        LOG(ERROR) << "Unable to set brightness to dim";
+      }
+      break;
+    case ScreensaverState::OFF:
+      if (android::base::WriteStringToFile("0", brightness_file_)) {
+        LOG(INFO) << "Brightness: 0 (off)";
+        screensaver_state_ = ScreensaverState::OFF;
+      } else {
+        LOG(ERROR) << "Unable to set brightness to off";
+      }
+      break;
+    default:
+      LOG(ERROR) << "Invalid screensaver state";
+  }
+}
+
+int RecoveryUI::WaitKey() {
+  std::unique_lock<std::mutex> lk(key_queue_mutex);
+
+  // Check for a saved key queue interruption.
+  if (key_interrupted_) {
+    SetScreensaverState(ScreensaverState::NORMAL);
+    return static_cast<int>(KeyError::INTERRUPTED);
+  }
+
+  // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is plugged in.
+  do {
+    bool rc = key_queue_cond.wait_for(lk, std::chrono::seconds(UI_WAIT_KEY_TIMEOUT_SEC), [this] {
+      return this->key_queue_len != 0 || key_interrupted_;
+    });
+    if (key_interrupted_) {
+      SetScreensaverState(ScreensaverState::NORMAL);
+      return static_cast<int>(KeyError::INTERRUPTED);
+    }
+    if (screensaver_state_ != ScreensaverState::DISABLED) {
+      if (!rc) {
+        // Must be after a timeout. Lower the brightness level: NORMAL -> DIMMED; DIMMED -> OFF.
+        if (screensaver_state_ == ScreensaverState::NORMAL) {
+          SetScreensaverState(ScreensaverState::DIMMED);
+        } else if (screensaver_state_ == ScreensaverState::DIMMED) {
+          SetScreensaverState(ScreensaverState::OFF);
+        }
+      } else if (screensaver_state_ != ScreensaverState::NORMAL) {
+        // Drop the first key if it's changing from OFF to NORMAL.
+        if (screensaver_state_ == ScreensaverState::OFF) {
+          if (key_queue_len > 0) {
+            memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
+          }
+        }
+
+        // Reset the brightness to normal.
+        SetScreensaverState(ScreensaverState::NORMAL);
+      }
+    }
+  } while (IsUsbConnected() && key_queue_len == 0);
+
+  int key = static_cast<int>(KeyError::TIMED_OUT);
+  if (key_queue_len > 0) {
+    key = key_queue[0];
+    memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
+  }
+  return key;
+}
+
+void RecoveryUI::InterruptKey() {
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    key_interrupted_ = true;
+  }
+  key_queue_cond.notify_one();
+}
+
+bool RecoveryUI::IsUsbConnected() {
+  int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
+  if (fd < 0) {
+    printf("failed to open /sys/class/android_usb/android0/state: %s\n", strerror(errno));
+    return 0;
+  }
+
+  char buf;
+  // USB is connected if android_usb state is CONNECTED or CONFIGURED.
+  int connected = (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) && (buf == 'C');
+  if (close(fd) < 0) {
+    printf("failed to close /sys/class/android_usb/android0/state: %s\n", strerror(errno));
+  }
+  return connected;
+}
+
+bool RecoveryUI::IsKeyPressed(int key) {
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
+  int pressed = key_pressed[key];
+  return pressed;
+}
+
+bool RecoveryUI::IsLongPress() {
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
+  bool result = key_long_press;
+  return result;
+}
+
+bool RecoveryUI::HasThreeButtons() {
+  return has_power_key && has_up_key && has_down_key;
+}
+
+bool RecoveryUI::HasPowerKey() const {
+  return has_power_key;
+}
+
+bool RecoveryUI::HasTouchScreen() const {
+  return has_touch_screen;
+}
+
+void RecoveryUI::FlushKeys() {
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
+  key_queue_len = 0;
+}
+
+RecoveryUI::KeyAction RecoveryUI::CheckKey(int key, bool is_long_press) {
+  {
+    std::lock_guard<std::mutex> lg(key_queue_mutex);
+    key_long_press = false;
+  }
+
+  // If we have power and volume up keys, that chord is the signal to toggle the text display.
+  if (HasThreeButtons() || (HasPowerKey() && HasTouchScreen() && touch_screen_allowed_)) {
+    if ((key == KEY_VOLUMEUP || key == KEY_UP) && IsKeyPressed(KEY_POWER)) {
+      return TOGGLE;
+    }
+  } else {
+    // Otherwise long press of any button toggles to the text display,
+    // and there's no way to toggle back (but that's pretty useless anyway).
+    if (is_long_press && !IsTextVisible()) {
+      return TOGGLE;
+    }
+
+    // Also, for button-limited devices, a long press is translated to KEY_ENTER.
+    if (is_long_press && IsTextVisible()) {
+      EnqueueKey(KEY_ENTER);
+      return IGNORE;
+    }
+  }
+
+  // Press power seven times in a row to reboot.
+  if (key == KEY_POWER) {
+    bool reboot_enabled = enable_reboot;
+
+    if (reboot_enabled) {
+      ++consecutive_power_keys;
+      if (consecutive_power_keys >= 7) {
+        return REBOOT;
+      }
+    }
+  } else {
+    consecutive_power_keys = 0;
+  }
+
+  last_key = key;
+  return (IsTextVisible() || screensaver_state_ == ScreensaverState::OFF) ? ENQUEUE : IGNORE;
+}
+
+void RecoveryUI::KeyLongPress(int) {}
+
+void RecoveryUI::SetEnableReboot(bool enabled) {
+  std::lock_guard<std::mutex> lg(key_queue_mutex);
+  enable_reboot = enabled;
+}
diff --git a/recovery_ui/vr_device.cpp b/recovery_ui/vr_device.cpp
new file mode 100644
index 000000000..fd7613307
--- /dev/null
+++ b/recovery_ui/vr_device.cpp
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/device.h"
+#include "recovery_ui/vr_ui.h"
+
+Device* make_device() {
+  return new Device(new VrRecoveryUI);
+}
diff --git a/recovery_ui/vr_ui.cpp b/recovery_ui/vr_ui.cpp
new file mode 100644
index 000000000..5b9b1b4e5
--- /dev/null
+++ b/recovery_ui/vr_ui.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/vr_ui.h"
+
+#include <android-base/properties.h>
+
+#include "minui/minui.h"
+
+constexpr int kDefaultStereoOffset = 0;
+
+VrRecoveryUI::VrRecoveryUI()
+    : stereo_offset_(
+          android::base::GetIntProperty("ro.recovery.ui.stereo_offset", kDefaultStereoOffset)) {}
+
+int VrRecoveryUI::ScreenWidth() const {
+  return gr_fb_width() / 2;
+}
+
+int VrRecoveryUI::ScreenHeight() const {
+  return gr_fb_height();
+}
+
+void VrRecoveryUI::DrawSurface(const GRSurface* surface, int sx, int sy, int w, int h, int dx,
+                               int dy) const {
+  gr_blit(surface, sx, sy, w, h, dx + stereo_offset_, dy);
+  gr_blit(surface, sx, sy, w, h, dx - stereo_offset_ + ScreenWidth(), dy);
+}
+
+void VrRecoveryUI::DrawTextIcon(int x, int y, const GRSurface* surface) const {
+  gr_texticon(x + stereo_offset_, y, surface);
+  gr_texticon(x - stereo_offset_ + ScreenWidth(), y, surface);
+}
+
+int VrRecoveryUI::DrawTextLine(int x, int y, const std::string& line, bool bold) const {
+  gr_text(gr_sys_font(), x + stereo_offset_, y, line.c_str(), bold);
+  gr_text(gr_sys_font(), x - stereo_offset_ + ScreenWidth(), y, line.c_str(), bold);
+  return char_height_ + 4;
+}
+
+int VrRecoveryUI::DrawHorizontalRule(int y) const {
+  y += 4;
+  gr_fill(margin_width_ + stereo_offset_, y, ScreenWidth() - margin_width_ + stereo_offset_, y + 2);
+  gr_fill(ScreenWidth() + margin_width_ - stereo_offset_, y,
+          gr_fb_width() - margin_width_ - stereo_offset_, y + 2);
+  return y + 4;
+}
+
+void VrRecoveryUI::DrawHighlightBar(int /* x */, int y, int /* width */, int height) const {
+  gr_fill(margin_width_ + stereo_offset_, y, ScreenWidth() - margin_width_ + stereo_offset_,
+          y + height);
+  gr_fill(ScreenWidth() + margin_width_ - stereo_offset_, y,
+          gr_fb_width() - margin_width_ - stereo_offset_, y + height);
+}
+
+void VrRecoveryUI::DrawFill(int x, int y, int w, int h) const {
+  gr_fill(x + stereo_offset_, y, w, h);
+  gr_fill(x - stereo_offset_ + ScreenWidth(), y, w, h);
+}
diff --git a/recovery_ui/wear_device.cpp b/recovery_ui/wear_device.cpp
new file mode 100644
index 000000000..bf21bc962
--- /dev/null
+++ b/recovery_ui/wear_device.cpp
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/device.h"
+#include "recovery_ui/wear_ui.h"
+
+Device* make_device() {
+  return new Device(new WearRecoveryUI);
+}
diff --git a/recovery_ui/wear_ui.cpp b/recovery_ui/wear_ui.cpp
new file mode 100644
index 000000000..8d8108f14
--- /dev/null
+++ b/recovery_ui/wear_ui.cpp
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "recovery_ui/wear_ui.h"
+
+#include <string.h>
+
+#include <string>
+#include <vector>
+
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+#include <minui/minui.h>
+
+constexpr int kDefaultProgressBarBaseline = 259;
+constexpr int kDefaultMenuUnusableRows = 9;
+
+WearRecoveryUI::WearRecoveryUI()
+    : ScreenRecoveryUI(true),
+      progress_bar_baseline_(android::base::GetIntProperty("ro.recovery.ui.progress_bar_baseline",
+                                                           kDefaultProgressBarBaseline)),
+      menu_unusable_rows_(android::base::GetIntProperty("ro.recovery.ui.menu_unusable_rows",
+                                                        kDefaultMenuUnusableRows)) {
+  // TODO: menu_unusable_rows_ should be computed based on the lines in draw_screen_locked().
+
+  touch_screen_allowed_ = true;
+}
+
+int WearRecoveryUI::GetProgressBaseline() const {
+  return progress_bar_baseline_;
+}
+
+// Draw background frame on the screen.  Does not flip pages.
+// Should only be called with updateMutex locked.
+// TODO merge drawing routines with screen_ui
+void WearRecoveryUI::draw_background_locked() {
+  pagesIdentical = false;
+  gr_color(0, 0, 0, 255);
+  gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+
+  if (current_icon_ != NONE) {
+    const auto& frame = GetCurrentFrame();
+    int frame_width = gr_get_width(frame);
+    int frame_height = gr_get_height(frame);
+    int frame_x = (gr_fb_width() - frame_width) / 2;
+    int frame_y = (gr_fb_height() - frame_height) / 2;
+    gr_blit(frame, 0, 0, frame_width, frame_height, frame_x, frame_y);
+
+    // Draw recovery text on screen above progress bar.
+    const auto& text = GetCurrentText();
+    int text_x = (ScreenWidth() - gr_get_width(text)) / 2;
+    int text_y = GetProgressBaseline() - gr_get_height(text) - 10;
+    gr_color(255, 255, 255, 255);
+    gr_texticon(text_x, text_y, text);
+  }
+}
+
+void WearRecoveryUI::draw_screen_locked() {
+  draw_background_locked();
+  if (!show_text) {
+    draw_foreground_locked();
+  } else {
+    SetColor(UIElement::TEXT_FILL);
+    gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+
+    // clang-format off
+    static std::vector<std::string> SWIPE_HELP = {
+      "Swipe up/down to move.",
+      "Swipe left/right to select.",
+      "",
+    };
+    // clang-format on
+    draw_menu_and_text_buffer_locked(SWIPE_HELP);
+  }
+}
+
+// TODO merge drawing routines with screen_ui
+void WearRecoveryUI::update_progress_locked() {
+  draw_screen_locked();
+  gr_flip();
+}
+
+void WearRecoveryUI::SetStage(int /* current */, int /* max */) {}
+
+std::unique_ptr<Menu> WearRecoveryUI::CreateMenu(const std::vector<std::string>& text_headers,
+                                                 const std::vector<std::string>& text_items,
+                                                 size_t initial_selection) const {
+  if (text_rows_ > 0 && text_cols_ > 0) {
+    return std::make_unique<TextMenu>(scrollable_menu_, text_rows_ - menu_unusable_rows_ - 1,
+                                      text_cols_ - 1, text_headers, text_items, initial_selection,
+                                      char_height_, *this);
+  }
+
+  return nullptr;
+}