native_client_sdk/src/examples/api/mouse_lock/mouse_lock.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <cmath>
   6
   7 #include "ppapi/c/ppb_fullscreen.h"
   8 #include "ppapi/c/ppb_input_event.h"
   9 #include "ppapi/cpp/completion_callback.h"
  10 #include "ppapi/cpp/fullscreen.h"
  11 #include "ppapi/cpp/graphics_2d.h"
  12 #include "ppapi/cpp/image_data.h"
  13 #include "ppapi/cpp/input_event.h"
  14 #include "ppapi/cpp/instance.h"
  15 #include "ppapi/cpp/module.h"
  16 #include "ppapi/cpp/mouse_lock.h"
  17 #include "ppapi/cpp/rect.h"
  18 #include "ppapi/cpp/size.h"
  19 #include "ppapi/cpp/var.h"
  20 #include "ppapi/utility/completion_callback_factory.h"
  21
  22 #ifdef _MSC_VER
  23 // Allow 'this' in initializer list
  24 #pragma warning(disable : 4355)
  25 #endif
  26
  27 class MouseLockInstance : public pp::Instance, public pp::MouseLock {
  28  public:
  29   explicit MouseLockInstance(PP_Instance instance)
  30       : pp::Instance(instance),
  31         pp::MouseLock(this),
  32         mouse_locked_(false),
  33         waiting_for_flush_completion_(false),
  34         callback_factory_(this),
  35         fullscreen_(this),
  36         is_context_bound_(false),
  37         was_fullscreen_(false),
  38         background_scanline_(NULL) {}
  39   virtual ~MouseLockInstance();
  40
  41   // Called by the browser when the NaCl module is loaded and all ready to go.
  42   virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]);
  43
  44   // Called by the browser to handle incoming input events.
  45   virtual bool HandleInputEvent(const pp::InputEvent& event);
  46
  47   // Called whenever the in-browser window changes size.
  48   virtual void DidChangeView(const pp::View& view);
  49
  50   // Called by the browser when mouselock is lost.  This happens when the NaCl
  51   // module exits fullscreen mode.
  52   virtual void MouseLockLost();
  53
  54  private:
  55   // Return the Cartesian distance between two points.
  56   double GetDistance(int point_1_x,
  57                      int point_1_y,
  58                      int point_2_x,
  59                      int point_2_y) {
  60     return sqrt(pow(static_cast<double>(point_1_x - point_2_x), 2) +
  61                 pow(static_cast<double>(point_1_y - point_2_y), 2));
  62   }
  63
  64   // Called when mouse lock has been acquired.  Used as a callback to
  65   // pp::MouseLock.LockMouse().
  66   void DidLockMouse(int32_t result);
  67
  68   // Called when the 2D context has been flushed to the browser window.  Used
  69   // as a callback to pp::Graphics2D.Flush().
  70   void DidFlush(int32_t result);
  71
  72   // Creates a new paint buffer, paints it then flush it to the 2D context.  If
  73   // a flush is pending, this does nothing.
  74   void Paint();
  75
  76   // Create a new pp::ImageData and paint the graphics that represent the mouse
  77   // movement in it.  Return the new pp::ImageData.
  78   pp::ImageData PaintImage(const pp::Size& size);
  79
  80   // Fill the image with the background color.
  81   void ClearToBackground(pp::ImageData* image);
  82
  83   void DrawCenterSpot(pp::ImageData* image, uint32_t spot_color);
  84
  85   void DrawNeedle(pp::ImageData* image, uint32_t needle_color);
  86
  87   // Print the printf-style format to the "console" via PostMessage.
  88   void Log(const char* format, ...);
  89
  90   pp::Size size_;
  91
  92   bool mouse_locked_;
  93   pp::Point mouse_movement_;
  94   bool waiting_for_flush_completion_;
  95   pp::CompletionCallbackFactory<MouseLockInstance> callback_factory_;
  96
  97   pp::Fullscreen fullscreen_;
  98   pp::Graphics2D device_context_;
  99   bool is_context_bound_;
 100   bool was_fullscreen_;
 101   uint32_t* background_scanline_;
 102 };