native_client_sdk/src/examples/gamepad/gamepad.h

   1 // Copyright (c) 2012 The Native Client 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 #ifndef EXAMPLES_GAMEPAD_GAMEPAD_H_
   6 #define EXAMPLES_GAMEPAD_GAMEPAD_H_
   7
   8 #include <map>
   9 #include <vector>
  10 #include "ppapi/c/ppb_gamepad.h"
  11 #include "ppapi/cpp/graphics_2d.h"
  12 #include "ppapi/cpp/image_data.h"
  13 #include "ppapi/cpp/instance.h"
  14 #include "ppapi/cpp/rect.h"
  15 #include "ppapi/cpp/size.h"
  16
  17 namespace gamepad {
  18
  19 // The Instance class.  One of these exists for each instance of your NaCl
  20 // module on the web page.  The browser will ask the Module object to create
  21 // a new Instance for each occurrence of the <embed> tag that has these
  22 // attributes:
  23 //     type="application/x-nacl"
  24 //     nacl="pi_generator.nmf"
  25 class Gamepad : public pp::Instance {
  26  public:
  27   explicit Gamepad(PP_Instance instance);
  28   virtual ~Gamepad();
  29
  30   // Update the graphics context to the new size, and regenerate |pixel_buffer_|
  31   // to fit the new size as well.
  32   virtual void DidChangeView(const pp::View& view);
  33
  34   // Flushes its contents of |pixel_buffer_| to the 2D graphics context.
  35   void Paint();
  36
  37   bool quit() const {
  38     return quit_;
  39   }
  40
  41   int width() const {
  42     return pixel_buffer_ ? pixel_buffer_->size().width() : 0;
  43   }
  44   int height() const {
  45     return pixel_buffer_ ? pixel_buffer_->size().height() : 0;
  46   }
  47
  48   // Indicate whether a flush is pending.  This can only be called from the
  49   // main thread; it is not thread safe.
  50   bool flush_pending() const {
  51     return flush_pending_;
  52   }
  53   void set_flush_pending(bool flag) {
  54     flush_pending_ = flag;
  55   }
  56
  57  private:
  58   // Create and initialize the 2D context used for drawing.
  59   void CreateContext(const pp::Size& size);
  60   // Destroy the 2D drawing context.
  61   void DestroyContext();
  62   // Push the pixels to the browser, then attempt to flush the 2D context.  If
  63   // there is a pending flush on the 2D context, then update the pixels only
  64   // and do not flush.
  65   void FlushPixelBuffer();
  66
  67   bool IsContextValid() const {
  68     return graphics_2d_context_ != NULL;
  69   }
  70
  71   pp::Graphics2D* graphics_2d_context_;
  72   pp::ImageData* pixel_buffer_;
  73   const PPB_Gamepad* gamepad_;
  74   bool flush_pending_;
  75   bool quit_;
  76 };
  77
  78 }  // namespace gamepad
  79
  80 #endif  // EXAMPLES_GAMEPAD_GAMEPAD_H_