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From 278945f12726692bc8b148ea1a59697a1c01405a Mon Sep 17 00:00:00 2001
From: Scott Murray <scott.murray@konsulko.com>
Date: Mon, 14 Nov 2022 17:58:12 -0500
Subject: [PATCH] Add optional agl_shell plugin

Add an optional agl_shell static plugin to expose the activate_app
call from the agl-shell Wayland protocol that is used when running
against the AGL compositor.  This provides a way for a homescreen
application to activate other application surfaces to switch between
multiple applications as is needed for the AGL demo.

Upstream-Status: Pending
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
---
 cmake/plugins.cmake                         |  5 ++
 shell/engine.cc                             |  6 ++
 shell/engine.h                              | 10 +++
 shell/platform_channel.cc                   |  6 ++
 shell/static_plugins/agl_shell/agl_shell.cc | 77 +++++++++++++++++++++
 shell/static_plugins/agl_shell/agl_shell.h  | 31 +++++++++
 shell/wayland/display.cc                    |  8 +++
 shell/wayland/display.h                     |  3 +
 shell/wayland/window.h                      |  2 +
 9 files changed, 148 insertions(+)
 create mode 100644 shell/static_plugins/agl_shell/agl_shell.cc
 create mode 100644 shell/static_plugins/agl_shell/agl_shell.h

diff --git a/cmake/plugins.cmake b/cmake/plugins.cmake
index 6bdc75b..a599f95 100644
--- a/cmake/plugins.cmake
+++ b/cmake/plugins.cmake
@@ -101,4 +101,9 @@ if (BUILD_PLUGIN_SECURE_STORAGE)
     pkg_check_modules(PLUGIN_SECURE_STORAGE REQUIRED libsecret-1)
 endif ()
 
+option(BUILD_PLUGIN_AGL_SHELL "Includes AGL Shell Wayland Protocol Plugin" OFF)
+if (BUILD_PLUGIN_AGL_SHELL)
+    ENABLE_PLUGIN(agl_shell)
+endif ()
+
 message(STATUS "Plugin Config .......... ${PLUGINS}")
diff --git a/shell/engine.cc b/shell/engine.cc
index ad0c83c..9ce346d 100644
--- a/shell/engine.cc
+++ b/shell/engine.cc
@@ -595,3 +595,9 @@ MAYBE_UNUSED TextInput* Engine::GetTextInput() const {
 }
 
 #endif
+
+#if ENABLE_PLUGIN_AGL_SHELL
+std::shared_ptr<Display> Engine::GetDisplay() const {
+  return m_egl_window->GetDisplay();
+}
+#endif
diff --git a/shell/engine.h b/shell/engine.h
index 501ba4b..4193e7e 100644
--- a/shell/engine.h
+++ b/shell/engine.h
@@ -50,6 +50,12 @@ class TextInput;
 
 #endif
 
+#if ENABLE_PLUGIN_AGL_SHELL
+
+class Display;
+
+#endif
+
 class Engine {
  public:
   Engine(FlutterView* view,
@@ -146,6 +152,10 @@ class Engine {
 
 #endif
 
+#if ENABLE_PLUGIN_AGL_SHELL
+  std::shared_ptr<Display> GetDisplay() const;
+#endif
+
   Backend* GetBackend() {
     return m_backend;
   }
diff --git a/shell/platform_channel.cc b/shell/platform_channel.cc
index 10f4715..2c7ab8c 100644
--- a/shell/platform_channel.cc
+++ b/shell/platform_channel.cc
@@ -53,6 +53,9 @@
 #ifdef ENABLE_PLUGIN_SECURE_STORAGE
 #include "static_plugins/secure_storage/secure_storage.h"
 #endif
+#ifdef ENABLE_PLUGIN_AGL_SHELL
+#include "static_plugins/agl_shell/agl_shell.h"
+#endif
 
 PlatformChannel* PlatformChannel::singleton = nullptr;
 
@@ -101,4 +104,7 @@ PlatformChannel::PlatformChannel() {
   RegisterCallback(SecureStorage::kChannelName,
                    &SecureStorage::OnPlatformMessage);
 #endif
+#ifdef ENABLE_PLUGIN_AGL_SHELL
+  RegisterCallback(AglShell::kChannelName, &AglShell::OnPlatformMessage);
+#endif
 }
diff --git a/shell/static_plugins/agl_shell/agl_shell.cc b/shell/static_plugins/agl_shell/agl_shell.cc
new file mode 100644
index 0000000..81627b6
--- /dev/null
+++ b/shell/static_plugins/agl_shell/agl_shell.cc
@@ -0,0 +1,77 @@
+// Copyright 2020 Toyota Connected North America
+// Copyright 2022 Konsulko Group
+//
+// 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 "agl_shell.h"
+
+#include <flutter/fml/logging.h>
+#include <flutter/standard_method_codec.h>
+
+#include "engine.h"
+#include "wayland/display.h"
+
+#include <iostream>
+
+void AglShell::OnPlatformMessage(const FlutterPlatformMessage* message,
+                                    void* userdata) {
+  std::unique_ptr<std::vector<uint8_t>> result;
+  auto engine = reinterpret_cast<Engine*>(userdata);
+  auto& codec = flutter::StandardMethodCodec::GetInstance();
+  auto obj = codec.DecodeMethodCall(message->message, message->message_size);
+
+  auto method = obj->method_name();
+  if (method == kMethodActivateApp) {
+    if (obj->arguments()->IsNull()) {
+      result = codec.EncodeErrorEnvelope("argument_error", "Invalid Arguments");
+      goto done;
+    }
+
+    auto args = std::get_if<flutter::EncodableMap>(obj->arguments());
+    if (!args) {
+      result = codec.EncodeErrorEnvelope("argument_error", "Invalid Arguments");
+      goto done;
+    }
+
+    std::string app_id;
+    auto it = args->find(flutter::EncodableValue("app_id"));
+    if (it != args->end()) {
+      app_id = std::get<std::string>(it->second);
+    }
+
+    int32_t index = 0;
+    it = args->find(flutter::EncodableValue("index"));
+    if (it != args->end()) {
+      index = std::get<int32_t>(it->second);
+    }
+
+    if (app_id.empty() || index < 0) {
+      result = codec.EncodeErrorEnvelope("argument_error", "Invalid Arguments");
+      goto done;
+    }
+
+    auto display = engine->GetDisplay();
+    if (display) {
+      display->AglShellDoActivate(app_id, index);
+    }
+    auto val = flutter::EncodableValue(true);
+    result = codec.EncodeSuccessEnvelope(&val);
+  } else {
+    FML_DLOG(INFO) << "AglShell: " << method << " is unhandled";
+    result = codec.EncodeErrorEnvelope("unhandled_method", "Unhandled Method");
+  }
+
+ done:
+  engine->SendPlatformMessageResponse(message->response_handle, result->data(),
+                                      result->size());
+}
diff --git a/shell/static_plugins/agl_shell/agl_shell.h b/shell/static_plugins/agl_shell/agl_shell.h
new file mode 100644
index 0000000..747eb36
--- /dev/null
+++ b/shell/static_plugins/agl_shell/agl_shell.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2020 Toyota Connected North America
+ * Copyright 2022 Konsulko Group
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <flutter_embedder.h>
+
+class AglShell {
+ public:
+  static constexpr char kChannelName[] = "flutter/agl_shell";
+
+  static void OnPlatformMessage(const FlutterPlatformMessage* message,
+                                void* userdata);
+
+ private:
+  static constexpr char kMethodActivateApp[] = "activate_app";
+};
diff --git a/shell/wayland/display.cc b/shell/wayland/display.cc
index 5d78471..48262c3 100644
--- a/shell/wayland/display.cc
+++ b/shell/wayland/display.cc
@@ -697,6 +697,14 @@ void Display::AglShellDoPanel(struct wl_surface* surface,
   }
 }
 
+void Display::AglShellDoActivate(const std::string& app_id,
+                                 size_t index) {
+  if (m_agl_shell) {
+    agl_shell_activate_app(m_agl_shell, app_id.c_str(),
+                           m_all_outputs[index]->output);
+  }
+}
+
 void Display::AglShellDoReady() {
   if (m_agl_shell) {
     agl_shell_ready(m_agl_shell);
diff --git a/shell/wayland/display.h b/shell/wayland/display.h
index bf05b27..c628c8c 100644
--- a/shell/wayland/display.h
+++ b/shell/wayland/display.h
@@ -82,6 +82,9 @@ class Display {
                        enum agl_shell_edge mode,
                        size_t index);
 
+  void AglShellDoActivate(const std::string& app_id,
+                          size_t index);
+
   void AglShellDoReady();
 
   void SetEngine(wl_surface* surface, Engine* engine);
diff --git a/shell/wayland/window.h b/shell/wayland/window.h
index 4b5c726..b4d0be3 100644
--- a/shell/wayland/window.h
+++ b/shell/wayland/window.h
@@ -81,6 +81,8 @@ class WaylandWindow {
   uint32_t m_fps_counter;
   static window_type get_window_type(const std::string& type);
 
+  std::shared_ptr<Display> GetDisplay() { return m_display; }
+
  private:
   struct shm_buffer {
     struct wl_buffer* buffer;
-- 
2.38.1