Implement the gamepad API in the IPC proxy

ppapi/examples/gamepad/gamepad.cc

 // Copyright (c) 2012 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 <cmath>
 #include <stdarg.h>
 #include <stdio.h>
 
 #include "ppapi/c/dev/ppb_console_dev.h"
 #include "ppapi/c/ppb_gamepad.h"
@@ skipping 67 matching lines @@
     if (!image.is_null()) {
       device_context_.ReplaceContents(&image);
       device_context_.Flush(
           callback_factory_.NewCallback(&MyInstance::OnFlush));
     } else {
       printf("NullImage\n");
     }
   }
 
   pp::ImageData PaintImage(const pp::Size& size) {
-    pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, false);
+    pp::ImageData image(this, PP_IMAGEDATAFORMAT_BGRA_PREMUL, size, true);

[raymes, 2012/09/05 21:05:57]

What's this for?

[brettw, 2012/09/05 21:25:51]

This was a bug in the example where it doesn't request that the data be cleared,
but doesn't clear it itself. When we wrote it this was OK since we always
cleared. My new image data cache means it isn't always cleared and the example
has some painting artifacts.

     if (image.is_null())
       return image;
 
     PP_GamepadsSampleData gamepad_data;
     gamepad_->Sample(pp_instance(), &gamepad_data);
 
     if (gamepad_data.length > 1 && gamepad_data.items[0].connected) {
       int width2 = size.width() / 2;
       int height2 = size.height() / 2;
       // Draw 2 axes
@@ skipping 42 matching lines @@
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp