Change ppapi_simple to support pixel format selection.

native_client_sdk/src/examples/demo/flock/flock.cc

 // Copyright 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 <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mount.h>
 
 #include <algorithm>
@@ skipping 98 matching lines @@
   FILE* fp = fopen("/images/flock_green.raw", "rb");
   fread(&fmt, sizeof(fmt), 1, fp);
 
   len = fmt.width * fmt.height * fmt.channels;
   buffer = new uint32_t[len];
   fread(buffer, 1, len, fp);
   fclose(fp);
 
   g_goose_sprite = new Sprite(buffer, pp::Size(fmt.width, fmt.height), 0);
 
-  PSContext2D_t* ctx = PSContext2DAllocate();
+  PSContext2D_t* ctx = PSContext2DAllocate(PP_IMAGEDATAFORMAT_BGRA_PREMUL);
   ResetFlock(ctx, 50);
   while (1) {
     PSEvent* event;
 
     // Consume all available events
     while ((event = PSEventTryAcquire()) != NULL) {
       PSContext2DHandleEvent(ctx, event);
       PSEventRelease(event);
     }
 
@@ skipping 10 matching lines @@
   }
 
   return 0;
 }
 
 /*
  * Register the function to call once the Instance Object is initialized.
  * see: pappi_simple/ps_main.h
  */
 PPAPI_SIMPLE_REGISTER_MAIN(example_main);