host/libs/confui/host_renderer.cc - device/google/cuttlefish - Git at Google

 /*
  * Copyright (C) 2021 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 "host/libs/confui/host_renderer.h"

 #include "host/libs/config/cuttlefish_config.h"

 namespace cuttlefish {
 namespace confui {
 static teeui::Color alfaCombineChannel(std::uint32_t shift, double alfa,
                                        teeui::Color a, teeui::Color b) {
   a >>= shift;
   a &= 0xff;
   b >>= shift;
   b &= 0xff;
   double acc = alfa * a + (1 - alfa) * b;
   if (acc <= 0) return 0;
   std::uint32_t result = acc;
   if (result > 255) return 255 << shift;
   return result << shift;
 }

 /**
  * create a raw frame for confirmation UI dialog
  *
  * Many rendering code borrowed from the following source
  *  https://android.googlesource.com/trusty/app/confirmationui/+/0429cc7/src
  */
 class ConfUiRendererImpl {
   friend class ConfUiRenderer;

  public:
   using LabelConfMsg = teeui::LabelBody;

  private:
   static Result<std::unique_ptr<ConfUiRendererImpl>> GenerateRenderer(
       const std::uint32_t display, const std::string& confirmation_msg,
       const std::string& locale, const bool inverted, const bool magnified);

   /**
    * this does not repaint from the scratch all the time
    *
    * It does repaint its frame buffer only when w/h of
    * current display has changed
    */
   std::unique_ptr<TeeUiFrameWrapper>& RenderRawFrame();

   bool IsFrameReady() const { return raw_frame_ && !raw_frame_->IsEmpty(); }

   bool IsInConfirm(const std::uint32_t x, const std::uint32_t y) {
     return IsInside<teeui::LabelOK>(x, y);
   }
   bool IsInCancel(const std::uint32_t x, const std::uint32_t y) {
     return IsInside<teeui::LabelCancel>(x, y);
   }

   bool IsSetUpSuccessful() const { return is_setup_well_; }
   ConfUiRendererImpl(const std::uint32_t display,
                      const std::string& confirmation_msg,
                      const std::string& locale, const bool inverted,
                      const bool magnified);

   struct Boundary {            // inclusive but.. LayoutElement's size is float
     std::uint32_t x, y, w, h;  // (x, y) is the top left
   };

   template <typename LayoutElement>
   Boundary GetBoundary(LayoutElement&& e) const {
     auto box = e.bounds_;
     Boundary b;
     // (x,y) is left top. so floor() makes sense
     // w, h are witdh and height in float. perhaps ceiling makes more
     // sense
     b.x = static_cast<std::uint32_t>(box.x().floor().count());
     b.y = static_cast<std::uint32_t>(box.y().floor().count());
     b.w = static_cast<std::uint32_t>(box.w().ceil().count());
     b.h = static_cast<std::uint32_t>(box.h().ceil().count());
     return b;
   }

   template <typename Element>
   bool IsInside(const std::uint32_t x, const std::uint32_t y) const {
     auto box = GetBoundary(std::get<Element>(layout_));
     if (x >= box.x && x <= box.x + box.w && y >= box.y && y <= box.y + box.h) {
       return true;
     }
     return false;
   }
   // essentially, to repaint from the scratch, so returns new frame
   // when successful. Or, nullopt
   std::unique_ptr<TeeUiFrameWrapper> RepaintRawFrame(const int w, const int h);

   bool InitLayout(const std::string& lang_id);
   teeui::Error UpdateTranslations();
   teeui::Error UpdateLocale();
   void SetDeviceContext(const unsigned long long w, const unsigned long long h,
                         bool is_inverted, bool is_magnified);

   // a callback function to be effectively sent to TeeUI library
   teeui::Error UpdatePixels(TeeUiFrameWrapper& buffer, std::uint32_t x,
                             std::uint32_t y, teeui::Color color);

   // second param is for type deduction
   template <typename... Elements>
   static teeui::Error drawElements(std::tuple<Elements...>& layout,
                                    const teeui::PixelDrawer& drawPixel) {
     // Error::operator|| is overloaded, so we don't get short circuit
     // evaluation. But we get the first error that occurs. We will still try and
     // draw the remaining elements in the order they appear in the layout tuple.
     return (std::get<Elements>(layout).draw(drawPixel) || ...);
   }
   void UpdateColorScheme(const bool is_inverted);
   template <typename Label>
   auto SetText(const std::string& text) {
     return std::get<Label>(layout_).setText(
         {text.c_str(), text.c_str() + text.size()});
   }

   template <typename Label>
   teeui::Error UpdateString();

   std::uint32_t display_num_;
   teeui::layout_t<teeui::ConfUILayout> layout_;
   std::string lang_id_;
   std::string prompt_text_;  // confirmation ui message

   /**
    * Potentially, the same frame could be requested multiple times.
    *
    * While another thread/caller is using this frame, the frame should
    * be kept here, too, to be returned upon future requests.
    *
    */
   std::unique_ptr<TeeUiFrameWrapper> raw_frame_;
   std::uint32_t current_height_;
   std::uint32_t current_width_;
   teeui::Color color_bg_;
   teeui::Color color_text_;
   teeui::Color shield_color_;
   bool is_inverted_;
   bool is_magnified_;
   teeui::context<teeui::ConfUIParameters> ctx_;
   bool is_setup_well_;

   static constexpr const teeui::Color kColorBackground = 0xffffffff;
   static constexpr const teeui::Color kColorBackgroundInv = 0xff212121;
   static constexpr const teeui::Color kColorDisabled = 0xffbdbdbd;
   static constexpr const teeui::Color kColorDisabledInv = 0xff424242;
   static constexpr const teeui::Color kColorEnabled = 0xff212121;
   static constexpr const teeui::Color kColorEnabledInv = 0xffdedede;
   static constexpr const teeui::Color kColorShield = 0xff778500;
   static constexpr const teeui::Color kColorShieldInv = 0xffc4cb80;
   static constexpr const teeui::Color kColorText = 0xff212121;
   static constexpr const teeui::Color kColorTextInv = 0xffdedede;
 };

 Result<std::unique_ptr<ConfUiRendererImpl>>
 ConfUiRendererImpl::GenerateRenderer(const std::uint32_t display,
                                      const std::string& confirmation_msg,
                                      const std::string& locale,
                                      const bool inverted,
                                      const bool magnified) {
   ConfUiRendererImpl* raw_ptr = new ConfUiRendererImpl(
       display, confirmation_msg, locale, inverted, magnified);
   CF_EXPECT(raw_ptr && raw_ptr->IsSetUpSuccessful(),
             "Failed to create ConfUiRendererImpl");
   return std::unique_ptr<ConfUiRendererImpl>(raw_ptr);
 }

 static int GetDpi(const int display_num = 0) {
   auto config = CuttlefishConfig::Get();
   CHECK(config) << "Config is Missing";
   auto instance = config->ForDefaultInstance();
   auto display_configs = instance.display_configs();
   CHECK_GT(display_configs.size(), display_num)
       << "Invalid display number " << display_num;
   return display_configs[display_num].dpi;
 }

 /**
  * device configuration
  *
  * ctx_{# of pixels in 1 mm, # of pixels per 1 density independent pixels}
  *
  * The numbers are, however, to fit for the host webRTC local/remote clients
  * in general, not necessarily the supposedly guest device (e.g. Auto, phone,
  * etc)
  *
  * In general, for a normal PC, roughly ctx_(6.45211, 400.0/412.0) is a good
  * combination for the default DPI, 320. If we want to see the impact
  * of the change in the guest DPI, we could adjust the combination above
  * proportionally
  *
  */
 ConfUiRendererImpl::ConfUiRendererImpl(const std::uint32_t display,
                                        const std::string& confirmation_msg,
                                        const std::string& locale,
                                        const bool inverted,
                                        const bool magnified)
     : display_num_{display},
       lang_id_{locale},
       prompt_text_{confirmation_msg},
       current_height_{ScreenConnectorInfo::ScreenHeight(display_num_)},
       current_width_{ScreenConnectorInfo::ScreenWidth(display_num_)},
       is_inverted_(inverted),
       is_magnified_(magnified),
       ctx_(6.45211 * GetDpi() / 320.0, 400.0 / 412.0 * GetDpi() / 320.0),
       is_setup_well_(false) {
   SetDeviceContext(current_width_, current_height_, is_inverted_,
                    is_magnified_);
   layout_ = teeui::instantiateLayout(teeui::ConfUILayout(), ctx_);

   if (auto error = UpdateLocale()) {
     ConfUiLog(ERROR) << "Update Translation Error: " << Enum2Base(error.code());
     // is_setup_well_ = false;
     return;
   }
   UpdateColorScheme(is_inverted_);
   SetText<LabelConfMsg>(prompt_text_);
   is_setup_well_ = true;
 }

 teeui::Error ConfUiRendererImpl::UpdateLocale() {
   using teeui::Error;
   teeui::localization::selectLangId(lang_id_.c_str());
   if (auto error = UpdateTranslations()) {
     return error;
   }
   return Error::OK;
 }

 template <typename Label>
 teeui::Error ConfUiRendererImpl::UpdateString() {
   using namespace teeui;
   const char* str;
   auto& label = std::get<Label>(layout_);
   str = localization::lookup(TranslationId(label.textId()));
   if (str == nullptr) {
     ConfUiLog(ERROR) << "Given translation_id" << label.textId() << "not found";
     return Error::Localization;
   }
   label.setText({str, str + strlen(str)});
   return Error::OK;
 }

 teeui::Error ConfUiRendererImpl::UpdateTranslations() {
   using namespace teeui;
   if (auto error = UpdateString<LabelOK>()) {
     return error;
   }
   if (auto error = UpdateString<LabelCancel>()) {
     return error;
   }
   if (auto error = UpdateString<LabelTitle>()) {
     return error;
   }
   if (auto error = UpdateString<LabelHint>()) {
     return error;
   }
   return Error::OK;
 }

 void ConfUiRendererImpl::SetDeviceContext(const unsigned long long w,
                                           const unsigned long long h,
                                           const bool is_inverted,
                                           const bool is_magnified) {
   using namespace teeui;
   const auto screen_width = operator""_px(w);
   const auto screen_height = operator""_px(h);
   ctx_.setParam<RightEdgeOfScreen>(pxs(screen_width));
   ctx_.setParam<BottomOfScreen>(pxs(screen_height));
   if (is_magnified) {
     ctx_.setParam<DefaultFontSize>(18_dp);
     ctx_.setParam<BodyFontSize>(20_dp);
   } else {
     ctx_.setParam<DefaultFontSize>(14_dp);
     ctx_.setParam<BodyFontSize>(16_dp);
   }
   if (is_inverted) {
     ctx_.setParam<ShieldColor>(kColorShieldInv);
     ctx_.setParam<ColorText>(kColorTextInv);
     ctx_.setParam<ColorBG>(kColorBackgroundInv);
     ctx_.setParam<ColorButton>(kColorShieldInv);
   } else {
     ctx_.setParam<ShieldColor>(kColorShield);
     ctx_.setParam<ColorText>(kColorText);
     ctx_.setParam<ColorBG>(kColorBackground);
     ctx_.setParam<ColorButton>(kColorShield);
   }
 }

 teeui::Error ConfUiRendererImpl::UpdatePixels(TeeUiFrameWrapper& raw_frame,
                                               std::uint32_t x, std::uint32_t y,
                                               teeui::Color color) {
   auto buffer = raw_frame.data();
   const auto height = raw_frame.Height();
   const auto width = raw_frame.Width();
   auto pos = width * y + x;
   if (pos >= (height * width)) {
     ConfUiLog(ERROR) << "Rendering Out of Bound";
     return teeui::Error::OutOfBoundsDrawing;
   }
   const double alfa = ((color & 0xff000000) >> 24) / 255.0;
   auto& pixel = *reinterpret_cast<teeui::Color*>(buffer + pos);
   pixel = alfaCombineChannel(0, alfa, color, pixel) |
           alfaCombineChannel(8, alfa, color, pixel) |
           alfaCombineChannel(16, alfa, color, pixel);
   return teeui::Error::OK;
 }

 void ConfUiRendererImpl::UpdateColorScheme(const bool is_inverted) {
   using namespace teeui;
   color_text_ = is_inverted ? kColorDisabledInv : kColorDisabled;
   shield_color_ = is_inverted ? kColorShieldInv : kColorShield;
   color_bg_ = is_inverted ? kColorBackgroundInv : kColorBackground;

   ctx_.setParam<ShieldColor>(shield_color_);
   ctx_.setParam<ColorText>(color_text_);
   ctx_.setParam<ColorBG>(color_bg_);
   return;
 }

 std::unique_ptr<TeeUiFrameWrapper>& ConfUiRendererImpl::RenderRawFrame() {
   /* we repaint only if one or more of the followng meet:
    *
    *  1. raw_frame_ is empty
    *  2. the current_width_ and current_height_ is out of date
    *
    */
   const int w = ScreenConnectorInfo::ScreenWidth(display_num_);
   const int h = ScreenConnectorInfo::ScreenHeight(display_num_);
   if (!IsFrameReady() || current_height_ != h || current_width_ != w) {
     auto new_frame = RepaintRawFrame(w, h);
     if (!new_frame) {
       // must repaint but failed
       raw_frame_ = nullptr;
       return raw_frame_;
     }
     // repainting from the scratch successful in a new frame
     raw_frame_ = std::move(new_frame);
     current_width_ = w;
     current_height_ = h;
   }
   return raw_frame_;
 }

 std::unique_ptr<TeeUiFrameWrapper> ConfUiRendererImpl::RepaintRawFrame(
     const int w, const int h) {
   std::get<teeui::LabelOK>(layout_).setTextColor(kColorEnabled);
   std::get<teeui::LabelCancel>(layout_).setTextColor(kColorEnabled);

   /**
    * should be uint32_t for teeui APIs.
    * It assumes that each raw frame buffer element is 4 bytes
    */
   const teeui::Color background_color =
       is_inverted_ ? kColorBackgroundInv : kColorBackground;
   auto new_raw_frame =
       std::make_unique<TeeUiFrameWrapper>(w, h, background_color);
   auto draw_pixel = teeui::makePixelDrawer(
       [this, &new_raw_frame](std::uint32_t x, std::uint32_t y,
                              teeui::Color color) -> teeui::Error {
         return this->UpdatePixels(*new_raw_frame, x, y, color);
       });

   // render all components
   const auto error = drawElements(layout_, draw_pixel);
   if (error) {
     ConfUiLog(ERROR) << "Painting failed: " << error.code();
     return nullptr;
   }

   return new_raw_frame;
 }

 ConfUiRenderer::ConfUiRenderer(ScreenConnectorFrameRenderer& screen_connector)
     : screen_connector_{screen_connector} {}

 ConfUiRenderer::~ConfUiRenderer() {}

 Result<void> ConfUiRenderer::RenderDialog(
     const std::uint32_t display_num, const std::string& prompt_text,
     const std::string& locale, const std::vector<teeui::UIOption>& ui_options) {
   renderer_impl_ = CF_EXPECT(ConfUiRendererImpl::GenerateRenderer(
       display_num, prompt_text, locale, IsInverted(ui_options),
       IsMagnified(ui_options)));
   auto& teeui_frame = renderer_impl_->RenderRawFrame();
   CF_EXPECT(teeui_frame != nullptr, "RenderRawFrame() failed.");
   ConfUiLog(VERBOSE) << "actually trying to render the frame"
                      << thread::GetName();
   auto frame_width = teeui_frame->Width();
   auto frame_height = teeui_frame->Height();
   auto frame_stride_bytes = teeui_frame->ScreenStrideBytes();
   auto frame_bytes = reinterpret_cast<std::uint8_t*>(teeui_frame->data());
   CF_EXPECT(screen_connector_.RenderConfirmationUi(
       display_num, frame_width, frame_height, frame_stride_bytes, frame_bytes));
   return {};
 }

 bool ConfUiRenderer::IsInverted(
     const std::vector<teeui::UIOption>& ui_options) const {
   return Contains(ui_options, teeui::UIOption::AccessibilityInverted);
 }

 bool ConfUiRenderer::IsMagnified(
     const std::vector<teeui::UIOption>& ui_options) const {
   return Contains(ui_options, teeui::UIOption::AccessibilityMagnified);
 }

 bool ConfUiRenderer::IsInConfirm(const std::uint32_t x, const std::uint32_t y) {
   if (!renderer_impl_) {
     ConfUiLog(INFO) << "renderer_impl_ is nullptr";
   }
   return renderer_impl_ && renderer_impl_->IsInConfirm(x, y);
 }
 bool ConfUiRenderer::IsInCancel(const std::uint32_t x, const std::uint32_t y) {
   if (!renderer_impl_) {
     ConfUiLog(INFO) << "renderer_impl_ is nullptr";
   }
   return renderer_impl_ && renderer_impl_->IsInCancel(x, y);
 }

 }  // end of namespace confui
 }  // end of namespace cuttlefish
	/*
	* Copyright (C) 2021 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 "host/libs/confui/host_renderer.h"

	#include "host/libs/config/cuttlefish_config.h"

	namespace cuttlefish {
	namespace confui {
	static teeui::Color alfaCombineChannel(std::uint32_t shift, double alfa,
	teeui::Color a, teeui::Color b) {
	a >>= shift;
	a &= 0xff;
	b >>= shift;
	b &= 0xff;
	double acc = alfa * a + (1 - alfa) * b;
	if (acc <= 0) return 0;
	std::uint32_t result = acc;
	if (result > 255) return 255 << shift;
	return result << shift;
	}

	/**
	* create a raw frame for confirmation UI dialog
	*
	* Many rendering code borrowed from the following source
	* https://android.googlesource.com/trusty/app/confirmationui/+/0429cc7/src
	*/
	class ConfUiRendererImpl {
	friend class ConfUiRenderer;

	public:
	using LabelConfMsg = teeui::LabelBody;

	private:
	static Result<std::unique_ptr<ConfUiRendererImpl>> GenerateRenderer(
	const std::uint32_t display, const std::string& confirmation_msg,
	const std::string& locale, const bool inverted, const bool magnified);

	/**
	* this does not repaint from the scratch all the time
	*
	* It does repaint its frame buffer only when w/h of
	* current display has changed
	*/
	std::unique_ptr<TeeUiFrameWrapper>& RenderRawFrame();

	bool IsFrameReady() const { return raw_frame_ && !raw_frame_->IsEmpty(); }

	bool IsInConfirm(const std::uint32_t x, const std::uint32_t y) {
	return IsInside<teeui::LabelOK>(x, y);
	}
	bool IsInCancel(const std::uint32_t x, const std::uint32_t y) {
	return IsInside<teeui::LabelCancel>(x, y);
	}

	bool IsSetUpSuccessful() const { return is_setup_well_; }
	ConfUiRendererImpl(const std::uint32_t display,
	const std::string& confirmation_msg,
	const std::string& locale, const bool inverted,
	const bool magnified);

	struct Boundary { // inclusive but.. LayoutElement's size is float
	std::uint32_t x, y, w, h; // (x, y) is the top left
	};

	template <typename LayoutElement>
	Boundary GetBoundary(LayoutElement&& e) const {
	auto box = e.bounds_;
	Boundary b;
	// (x,y) is left top. so floor() makes sense
	// w, h are witdh and height in float. perhaps ceiling makes more
	// sense
	b.x = static_cast<std::uint32_t>(box.x().floor().count());
	b.y = static_cast<std::uint32_t>(box.y().floor().count());
	b.w = static_cast<std::uint32_t>(box.w().ceil().count());
	b.h = static_cast<std::uint32_t>(box.h().ceil().count());
	return b;
	}

	template <typename Element>
	bool IsInside(const std::uint32_t x, const std::uint32_t y) const {
	auto box = GetBoundary(std::get<Element>(layout_));
	if (x >= box.x && x <= box.x + box.w && y >= box.y && y <= box.y + box.h) {
	return true;
	}
	return false;
	}
	// essentially, to repaint from the scratch, so returns new frame
	// when successful. Or, nullopt
	std::unique_ptr<TeeUiFrameWrapper> RepaintRawFrame(const int w, const int h);

	bool InitLayout(const std::string& lang_id);
	teeui::Error UpdateTranslations();
	teeui::Error UpdateLocale();
	void SetDeviceContext(const unsigned long long w, const unsigned long long h,
	bool is_inverted, bool is_magnified);

	// a callback function to be effectively sent to TeeUI library
	teeui::Error UpdatePixels(TeeUiFrameWrapper& buffer, std::uint32_t x,
	std::uint32_t y, teeui::Color color);

	// second param is for type deduction
	template <typename... Elements>
	static teeui::Error drawElements(std::tuple<Elements...>& layout,
	const teeui::PixelDrawer& drawPixel) {
	// Error::operator\|\| is overloaded, so we don't get short circuit
	// evaluation. But we get the first error that occurs. We will still try and
	// draw the remaining elements in the order they appear in the layout tuple.
	return (std::get<Elements>(layout).draw(drawPixel) \|\| ...);
	}
	void UpdateColorScheme(const bool is_inverted);
	template <typename Label>
	auto SetText(const std::string& text) {
	return std::get<Label>(layout_).setText(
	{text.c_str(), text.c_str() + text.size()});
	}

	template <typename Label>
	teeui::Error UpdateString();

	std::uint32_t display_num_;
	teeui::layout_t<teeui::ConfUILayout> layout_;
	std::string lang_id_;
	std::string prompt_text_; // confirmation ui message

	/**
	* Potentially, the same frame could be requested multiple times.
	*
	* While another thread/caller is using this frame, the frame should
	* be kept here, too, to be returned upon future requests.
	*
	*/
	std::unique_ptr<TeeUiFrameWrapper> raw_frame_;
	std::uint32_t current_height_;
	std::uint32_t current_width_;
	teeui::Color color_bg_;
	teeui::Color color_text_;
	teeui::Color shield_color_;
	bool is_inverted_;
	bool is_magnified_;
	teeui::context<teeui::ConfUIParameters> ctx_;
	bool is_setup_well_;

	static constexpr const teeui::Color kColorBackground = 0xffffffff;
	static constexpr const teeui::Color kColorBackgroundInv = 0xff212121;
	static constexpr const teeui::Color kColorDisabled = 0xffbdbdbd;
	static constexpr const teeui::Color kColorDisabledInv = 0xff424242;
	static constexpr const teeui::Color kColorEnabled = 0xff212121;
	static constexpr const teeui::Color kColorEnabledInv = 0xffdedede;
	static constexpr const teeui::Color kColorShield = 0xff778500;
	static constexpr const teeui::Color kColorShieldInv = 0xffc4cb80;
	static constexpr const teeui::Color kColorText = 0xff212121;
	static constexpr const teeui::Color kColorTextInv = 0xffdedede;
	};

	Result<std::unique_ptr<ConfUiRendererImpl>>
	ConfUiRendererImpl::GenerateRenderer(const std::uint32_t display,
	const std::string& confirmation_msg,
	const std::string& locale,
	const bool inverted,
	const bool magnified) {
	ConfUiRendererImpl* raw_ptr = new ConfUiRendererImpl(
	display, confirmation_msg, locale, inverted, magnified);
	CF_EXPECT(raw_ptr && raw_ptr->IsSetUpSuccessful(),
	"Failed to create ConfUiRendererImpl");
	return std::unique_ptr<ConfUiRendererImpl>(raw_ptr);
	}

	static int GetDpi(const int display_num = 0) {
	auto config = CuttlefishConfig::Get();
	CHECK(config) << "Config is Missing";
	auto instance = config->ForDefaultInstance();
	auto display_configs = instance.display_configs();
	CHECK_GT(display_configs.size(), display_num)
	<< "Invalid display number " << display_num;
	return display_configs[display_num].dpi;
	}

	/**
	* device configuration
	*
	* ctx_{# of pixels in 1 mm, # of pixels per 1 density independent pixels}
	*
	* The numbers are, however, to fit for the host webRTC local/remote clients
	* in general, not necessarily the supposedly guest device (e.g. Auto, phone,
	* etc)
	*
	* In general, for a normal PC, roughly ctx_(6.45211, 400.0/412.0) is a good
	* combination for the default DPI, 320. If we want to see the impact
	* of the change in the guest DPI, we could adjust the combination above
	* proportionally
	*
	*/
	ConfUiRendererImpl::ConfUiRendererImpl(const std::uint32_t display,
	const std::string& confirmation_msg,
	const std::string& locale,
	const bool inverted,
	const bool magnified)
	: display_num_{display},
	lang_id_{locale},
	prompt_text_{confirmation_msg},
	current_height_{ScreenConnectorInfo::ScreenHeight(display_num_)},
	current_width_{ScreenConnectorInfo::ScreenWidth(display_num_)},
	is_inverted_(inverted),
	is_magnified_(magnified),
	ctx_(6.45211 * GetDpi() / 320.0, 400.0 / 412.0 * GetDpi() / 320.0),
	is_setup_well_(false) {
	SetDeviceContext(current_width_, current_height_, is_inverted_,
	is_magnified_);
	layout_ = teeui::instantiateLayout(teeui::ConfUILayout(), ctx_);

	if (auto error = UpdateLocale()) {
	ConfUiLog(ERROR) << "Update Translation Error: " << Enum2Base(error.code());
	// is_setup_well_ = false;
	return;
	}
	UpdateColorScheme(is_inverted_);
	SetText<LabelConfMsg>(prompt_text_);
	is_setup_well_ = true;
	}

	teeui::Error ConfUiRendererImpl::UpdateLocale() {
	using teeui::Error;
	teeui::localization::selectLangId(lang_id_.c_str());
	if (auto error = UpdateTranslations()) {
	return error;
	}
	return Error::OK;
	}

	template <typename Label>
	teeui::Error ConfUiRendererImpl::UpdateString() {
	using namespace teeui;
	const char* str;
	auto& label = std::get<Label>(layout_);
	str = localization::lookup(TranslationId(label.textId()));
	if (str == nullptr) {
	ConfUiLog(ERROR) << "Given translation_id" << label.textId() << "not found";
	return Error::Localization;
	}
	label.setText({str, str + strlen(str)});
	return Error::OK;
	}

	teeui::Error ConfUiRendererImpl::UpdateTranslations() {
	using namespace teeui;
	if (auto error = UpdateString<LabelOK>()) {
	return error;
	}
	if (auto error = UpdateString<LabelCancel>()) {
	return error;
	}
	if (auto error = UpdateString<LabelTitle>()) {
	return error;
	}
	if (auto error = UpdateString<LabelHint>()) {
	return error;
	}
	return Error::OK;
	}

	void ConfUiRendererImpl::SetDeviceContext(const unsigned long long w,
	const unsigned long long h,
	const bool is_inverted,
	const bool is_magnified) {
	using namespace teeui;
	const auto screen_width = operator""_px(w);
	const auto screen_height = operator""_px(h);
	ctx_.setParam<RightEdgeOfScreen>(pxs(screen_width));
	ctx_.setParam<BottomOfScreen>(pxs(screen_height));
	if (is_magnified) {
	ctx_.setParam<DefaultFontSize>(18_dp);
	ctx_.setParam<BodyFontSize>(20_dp);
	} else {
	ctx_.setParam<DefaultFontSize>(14_dp);
	ctx_.setParam<BodyFontSize>(16_dp);
	}
	if (is_inverted) {
	ctx_.setParam<ShieldColor>(kColorShieldInv);
	ctx_.setParam<ColorText>(kColorTextInv);
	ctx_.setParam<ColorBG>(kColorBackgroundInv);
	ctx_.setParam<ColorButton>(kColorShieldInv);
	} else {
	ctx_.setParam<ShieldColor>(kColorShield);
	ctx_.setParam<ColorText>(kColorText);
	ctx_.setParam<ColorBG>(kColorBackground);
	ctx_.setParam<ColorButton>(kColorShield);
	}
	}

	teeui::Error ConfUiRendererImpl::UpdatePixels(TeeUiFrameWrapper& raw_frame,
	std::uint32_t x, std::uint32_t y,
	teeui::Color color) {
	auto buffer = raw_frame.data();
	const auto height = raw_frame.Height();
	const auto width = raw_frame.Width();
	auto pos = width * y + x;
	if (pos >= (height * width)) {
	ConfUiLog(ERROR) << "Rendering Out of Bound";
	return teeui::Error::OutOfBoundsDrawing;
	}
	const double alfa = ((color & 0xff000000) >> 24) / 255.0;
	auto& pixel = reinterpret_cast<teeui::Color>(buffer + pos);
	pixel = alfaCombineChannel(0, alfa, color, pixel) \|
	alfaCombineChannel(8, alfa, color, pixel) \|
	alfaCombineChannel(16, alfa, color, pixel);
	return teeui::Error::OK;
	}

	void ConfUiRendererImpl::UpdateColorScheme(const bool is_inverted) {
	using namespace teeui;
	color_text_ = is_inverted ? kColorDisabledInv : kColorDisabled;
	shield_color_ = is_inverted ? kColorShieldInv : kColorShield;
	color_bg_ = is_inverted ? kColorBackgroundInv : kColorBackground;

	ctx_.setParam<ShieldColor>(shield_color_);
	ctx_.setParam<ColorText>(color_text_);
	ctx_.setParam<ColorBG>(color_bg_);
	return;
	}

	std::unique_ptr<TeeUiFrameWrapper>& ConfUiRendererImpl::RenderRawFrame() {
	/* we repaint only if one or more of the followng meet:
	*
	* 1. raw_frame_ is empty
	* 2. the current_width_ and current_height_ is out of date
	*
	*/
	const int w = ScreenConnectorInfo::ScreenWidth(display_num_);
	const int h = ScreenConnectorInfo::ScreenHeight(display_num_);
	if (!IsFrameReady() \|\| current_height_ != h \|\| current_width_ != w) {
	auto new_frame = RepaintRawFrame(w, h);
	if (!new_frame) {
	// must repaint but failed
	raw_frame_ = nullptr;
	return raw_frame_;
	}
	// repainting from the scratch successful in a new frame
	raw_frame_ = std::move(new_frame);
	current_width_ = w;
	current_height_ = h;
	}
	return raw_frame_;
	}

	std::unique_ptr<TeeUiFrameWrapper> ConfUiRendererImpl::RepaintRawFrame(
	const int w, const int h) {
	std::get<teeui::LabelOK>(layout_).setTextColor(kColorEnabled);
	std::get<teeui::LabelCancel>(layout_).setTextColor(kColorEnabled);

	/**
	* should be uint32_t for teeui APIs.
	* It assumes that each raw frame buffer element is 4 bytes
	*/
	const teeui::Color background_color =
	is_inverted_ ? kColorBackgroundInv : kColorBackground;
	auto new_raw_frame =
	std::make_unique<TeeUiFrameWrapper>(w, h, background_color);
	auto draw_pixel = teeui::makePixelDrawer(
	[this, &new_raw_frame](std::uint32_t x, std::uint32_t y,
	teeui::Color color) -> teeui::Error {
	return this->UpdatePixels(*new_raw_frame, x, y, color);
	});

	// render all components
	const auto error = drawElements(layout_, draw_pixel);
	if (error) {
	ConfUiLog(ERROR) << "Painting failed: " << error.code();
	return nullptr;
	}

	return new_raw_frame;
	}

	ConfUiRenderer::ConfUiRenderer(ScreenConnectorFrameRenderer& screen_connector)
	: screen_connector_{screen_connector} {}

	ConfUiRenderer::~ConfUiRenderer() {}

	Result<void> ConfUiRenderer::RenderDialog(
	const std::uint32_t display_num, const std::string& prompt_text,
	const std::string& locale, const std::vector<teeui::UIOption>& ui_options) {
	renderer_impl_ = CF_EXPECT(ConfUiRendererImpl::GenerateRenderer(
	display_num, prompt_text, locale, IsInverted(ui_options),
	IsMagnified(ui_options)));
	auto& teeui_frame = renderer_impl_->RenderRawFrame();
	CF_EXPECT(teeui_frame != nullptr, "RenderRawFrame() failed.");
	ConfUiLog(VERBOSE) << "actually trying to render the frame"
	<< thread::GetName();
	auto frame_width = teeui_frame->Width();
	auto frame_height = teeui_frame->Height();
	auto frame_stride_bytes = teeui_frame->ScreenStrideBytes();
	auto frame_bytes = reinterpret_cast<std::uint8_t*>(teeui_frame->data());
	CF_EXPECT(screen_connector_.RenderConfirmationUi(
	display_num, frame_width, frame_height, frame_stride_bytes, frame_bytes));
	return {};
	}

	bool ConfUiRenderer::IsInverted(
	const std::vector<teeui::UIOption>& ui_options) const {
	return Contains(ui_options, teeui::UIOption::AccessibilityInverted);
	}

	bool ConfUiRenderer::IsMagnified(
	const std::vector<teeui::UIOption>& ui_options) const {
	return Contains(ui_options, teeui::UIOption::AccessibilityMagnified);
	}

	bool ConfUiRenderer::IsInConfirm(const std::uint32_t x, const std::uint32_t y) {
	if (!renderer_impl_) {
	ConfUiLog(INFO) << "renderer_impl_ is nullptr";
	}
	return renderer_impl_ && renderer_impl_->IsInConfirm(x, y);
	}
	bool ConfUiRenderer::IsInCancel(const std::uint32_t x, const std::uint32_t y) {
	if (!renderer_impl_) {
	ConfUiLog(INFO) << "renderer_impl_ is nullptr";
	}
	return renderer_impl_ && renderer_impl_->IsInCancel(x, y);
	}

	} // end of namespace confui
	} // end of namespace cuttlefish