Draft: apps APIs in Pepper

ppapi/examples/extensions/extensions.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/c/dev/ppb_alarms_dev.h"
+#include "ppapi/c/dev/ppb_memory_dev.h"
+#include "ppapi/c/ppb_console.h"
+#include "ppapi/c/ppb_input_event.h"
+#include "ppapi/c/ppb_var.h"
+#include "ppapi/cpp/dev/alarms_dev.h"
+#include "ppapi/cpp/graphics_2d.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/input_event.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/logging.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+using namespace pp;
+
+const PPB_Console* console = NULL;
+const PPB_Alarms_Dev* alarms_interface = NULL;
+const PPB_Var* var_interface = NULL;
+
+class MyInstance : public Instance {
+ public:
+  explicit MyInstance(PP_Instance instance)
+      : Instance(instance),
+        width_(0),
+        height_(0),
+        pending_paint_(false),
+        waiting_for_flush_completion_(false),
+        callback_factory_(this),
+        alarms_(InstanceHandle(instance)) {
+  }
+  virtual ~MyInstance() {
+  }
+
+  virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]) {
+    console = static_cast<const PPB_Console*>(
+        Module::Get()->GetBrowserInterface(PPB_CONSOLE_INTERFACE));
+    if (!console)
+      return false;
+
+    alarms_interface = static_cast<const PPB_Alarms_Dev*>(
+        Module::Get()->GetBrowserInterface(PPB_ALARMS_DEV_INTERFACE));
+    if (!alarms_interface)
+      return false;
+
+    var_interface = static_cast<const PPB_Var*>(
+        Module::Get()->GetBrowserInterface(PPB_VAR_INTERFACE));
+    if (!var_interface)
+      return false;
+
+    RequestInputEvents(PP_INPUTEVENT_CLASS_KEYBOARD);
+    return true;
+  }
+
+  virtual bool HandleInputEvent(const InputEvent& event) {
+    switch (event.GetType()) {
+      case PP_INPUTEVENT_TYPE_KEYDOWN: {
+        KeyboardInputEvent key_event(event);
+        switch (key_event.GetKeyCode()) {
+          /////////////////////////////////////////////////////////////////////
+          // Exercise the C interface PPB_Alarms_Dev.
+          /////////////////////////////////////////////////////////////////////
+          case '1' : {  // Create()
+            PP_Var name = var_interface->VarFromUtf8("alarms2",
+                                                      strlen("alarms2"));
+            PP_Alarms_AlarmCreateInfo_Dev create_info = {
+                {0, PP_FALSE},
+                {1, PP_TRUE},
+                {1, PP_TRUE}
+            };
+
+            alarms_interface->Create(pp_instance(), name, &create_info);
+
+            var_interface->Release(name);
+            break;
+          }
+          case '2' : {  // Get()
+            PP_Var name = var_interface->VarFromUtf8("alarms2",
+                                                      strlen("alarms2"));
+            PP_Alarms_Alarm_Dev* alarm = new PP_Alarms_Alarm_Dev();
+
+            // GetCallbackInC() will delete |alarm|.
+            // NOTE: |callback_factory_| should not be used in this case.
+            // Otherwise, |alarm| is leaked if this object is destroyed before
+            // the callback is executed.
+            PP_CompletionCallback callback = PP_MakeCompletionCallback(
+                &MyInstance::GetCallbackInC, alarm);
+
+            int32_t result = alarms_interface->Get(pp_instance(), name, alarm,
+                                                   callback);
+            PP_DCHECK(result == PP_OK_COMPLETIONPENDING);
+            var_interface->Release(name);
+            break;
+          }
+          case '3' : {  // GetAll()
+            PP_Alarms_Alarm_Array_Dev* alarms = new PP_Alarms_Alarm_Array_Dev();
+            PP_ArrayOutput array_allocator =
+                { &MyInstance::GetDataBuffer, NULL };
+
+            // GetAllCallbackInC() will delete |alarms|.
+            // NOTE: |callback_factory_| should not be used in this case.
+            // Otherwise, |alarms| is leaked if this object is destroyed before
+            // the callback is executed.
+            PP_CompletionCallback callback = PP_MakeCompletionCallback(
+                &MyInstance::GetAllCallbackInC, alarms);
+
+            int32_t result = alarms_interface->GetAll(
+                pp_instance(), alarms, array_allocator, callback);
+            PP_DCHECK(result == PP_OK_COMPLETIONPENDING);
+            break;
+          }
+          case '4' : {  // Clear()
+            PP_Var name = var_interface->VarFromUtf8("alarms2",
+                                                      strlen("alarms2"));
+            alarms_interface->Clear(pp_instance(), name);
+            var_interface->Release(name);
+            break;
+          }
+          case '5' : {  // Register event
+            break;
+          }
+          case '6' : { // Unregister event
+            break;
+          }
+
+          ////////////////////////////////////////////////////////////////////// 
+          // Exercise the C++ interface pp::alarms::Alarms_Dev.
+          //////////////////////////////////////////////////////////////////////
+          case 'A' : { // Create()
+            std::string name("alarm1");
+
+            alarms::AlarmCreateInfo_Dev create_info;
+            create_info.set_delay_in_minutes(1);
+            create_info.set_period_in_minutes(1);
+
+            alarms_.Create(name, create_info);
+            break;
+          }
+          case 'B' : {  // Get()
+            std::string name("alarm1");
+
+            CompletionCallbackWithOutput<alarms::Alarm_Dev>
+                callback = callback_factory_.NewCallbackWithOutput(
+                    &MyInstance::GetCallbackInCpp);
+
+            int32_t result = alarms_.Get(name, callback);
+            PP_DCHECK(result == PP_OK_COMPLETIONPENDING);
+            break;
+          }
+          case 'C' : {  // GetAll()
+            CompletionCallbackWithOutput<Array<alarms::Alarm_Dev> >
+                callback = callback_factory_.NewCallbackWithOutput(
+                    &MyInstance::GetAllCallbackInCpp);
+
+            int32_t result = alarms_.GetAll(callback);
+            PP_DCHECK(result == PP_OK_COMPLETIONPENDING);
+            break;
+          }
+          case 'D' : {  // Clear()
+            std::string name("alarm1");
+            alarms_.Clear(name);
+            break;
+          }
+          case 'E' : {  // Register event
+            break;
+          }
+          case 'F' : { // Unregister event
+            break;
+          }
+          default:
+            break;
+        }
+        return true;
+      }
+      default:
+        return false;
+    }
+  }
+
+  virtual void DidChangeView(const Rect& position, const Rect& clip) {
+    if (position.size().width() == width_ &&
+        position.size().height() == height_)
+      return;  // We don't care about the position, only the size.
+
+    width_ = position.size().width();
+    height_ = position.size().height();
+
+    device_context_ = Graphics2D(this, Size(width_, height_), false);
+    if (!BindGraphics(device_context_))
+      return;
+
+    Paint();
+  }
+
+ private:
+  //////////////////////////////////////////////////////////////////////////////
+  // Exercise the C interface.
+  //////////////////////////////////////////////////////////////////////////////
+  static void DestroyAlarmStruct(PP_Alarms_Alarm_Dev* alarm) {
+    var_interface->Release(alarm->name);
+    alarm->name = PP_MakeUndefined();
+  }
+
+  static void* GetDataBuffer(void* user_data, uint32_t count, uint32_t size) {
+    if (size != sizeof(PP_Alarms_Alarm_Dev)) {
+      PP_NOTREACHED();
+      return NULL;
+    }
+
+    if (count == 0)
+      return NULL;
+
+    // We don't have to remember the pointer. The browser is responsible to
+    // update |elements| and |size| in PP_Alarms_Alarm_Array_Dev.
+    return calloc(count, size);
+  }
+
+  static void DestroyAlarmArrayStruct(PP_Alarms_Alarm_Array_Dev* alarms) {
+    for (uint32_t i = 0; i < alarms->size; ++i)
+      DestroyAlarmStruct(alarms->elements + i);
+
+    free(alarms->elements);
+    alarms->elements = NULL;
+    alarms->size = 0;
+  }
+ 
+  static void GetAllCallbackInC(void* user_data, int32_t result) {
+    PP_Alarms_Alarm_Array_Dev* alarms =
+        static_cast<PP_Alarms_Alarm_Array_Dev*>(user_data);
+    if (result == PP_OK) {
+      for (uint32_t i = 0; i < alarms->size; ++i) {
+        PP_Alarms_Alarm_Dev& element = alarms->elements[i];
+        // The following fields are available.
+        element.name;
+        element.scheduled_time;
+        if (element.period_in_minutes.is_set)
+          element.period_in_minutes.value;
+      }
+    }
+    DestroyAlarmArrayStruct(alarms);
+    delete alarms;
+  }
+
+  static void GetCallbackInC(void* user_data, int32_t result) {
+    PP_Alarms_Alarm_Dev* alarm = static_cast<PP_Alarms_Alarm_Dev*>(user_data);
+    if (result == PP_OK) {
+      // The following fields are available.
+      alarm->name;
+      alarm->scheduled_time;
+      if (alarm->period_in_minutes.is_set)
+        alarm->period_in_minutes.value;
+    }
+    DestroyAlarmStruct(alarm);
+    delete alarm;
+  }
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Exercise the C++ interface.
+  //////////////////////////////////////////////////////////////////////////////
+  void GetAllCallbackInCpp(int32_t result,
+                           Array<alarms::Alarm_Dev>& alarms) {
+    if (result == PP_OK) {
+      for (size_t i = 0; i < alarms.size(); ++i) {
+        // The following fields are available.
+        alarms::Alarm_Dev& alarm = alarms[i];
+        alarm.name();
+        alarm.scheduled_time();
+        if (alarm.is_period_in_minutes_set())
+          alarm.period_in_minutes();
+      }
+    }
+  }
+
+  void GetCallbackInCpp(int32_t result, alarms::Alarm_Dev& alarm) {
+    if (result == PP_OK) {
+      // The following fields are available.
+        alarm.name();
+        alarm.scheduled_time();
+        if (alarm.is_period_in_minutes_set())
+          alarm.period_in_minutes();
+    }
+  }
+
+  void DidFlush(int32_t result) {
+    waiting_for_flush_completion_ = false;
+    if (pending_paint_) {
+      pending_paint_ = false;
+      Paint();
+    }
+  }
+
+  void Paint() {
+    if (waiting_for_flush_completion_) {
+      pending_paint_ = true;
+      return;
+    }
+
+    ImageData image = PaintImage(width_, height_);
+    if (!image.is_null()) {
+      device_context_.ReplaceContents(&image);
+      waiting_for_flush_completion_ = true;
+      device_context_.Flush(
+          callback_factory_.NewCallback(&MyInstance::DidFlush));
+    }
+  }
+
+  ImageData PaintImage(int width, int height) {
+    ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL,
+                    Size(width, height), false);
+    if (image.is_null())
+      return image;
+
+    for (int y = 0; y < image.size().height(); ++y) {
+      for (int x = 0; x < image.size().width(); ++x) {
+        *image.GetAddr32(Point(x, y)) = 0xfff0f0f0;
+      }
+    }
+
+    return image;
+  }
+
+  void Log(PP_LogLevel level, const char* format, ...) {
+    va_list args;
+    va_start(args, format);
+    char buf[512];
+    vsnprintf(buf, sizeof(buf) - 1, format, args);
+    buf[sizeof(buf) - 1] = '\0';
+    va_end(args);
+
+    Var value(buf);
+    console->Log(pp_instance(), level, value.pp_var());
+  }
+
+  int width_;
+  int height_;
+
+  bool pending_paint_;
+  bool waiting_for_flush_completion_;
+
+  CompletionCallbackFactory<MyInstance> callback_factory_;
+
+  alarms::Alarms_Dev alarms_;
+
+  Graphics2D device_context_;
+};
+
+// This object is the global object representing this plugin library as long
+// as it is loaded.
+class MyModule : public Module {
+ public:
+  MyModule() : Module() {}
+  virtual ~MyModule() {}
+
+  // Override CreateInstance to create your customized Instance object.
+  virtual Instance* CreateInstance(PP_Instance instance) {
+    return new MyInstance(instance);
+  }
+};
+
+namespace pp {
+
+// Factory function for your specialization of the Module object.
+Module* CreateModule() {
+  return new MyModule();
+}
+
+}  // namespace pp
+