webkit/plugins/ppapi/host_array_buffer_var.cc

   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 "webkit/plugins/ppapi/host_array_buffer_var.h"
   6
   7 #include <stdio.h>
   8 #include <string.h>
   9
  10 #include "base/logging.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/process_util.h"
  13 #include "ppapi/c/pp_instance.h"
  14 #include "webkit/plugins/ppapi/host_globals.h"
  15 #include "webkit/plugins/ppapi/plugin_module.h"
  16 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
  17
  18 using ppapi::ArrayBufferVar;
  19 using WebKit::WebArrayBuffer;
  20
  21 namespace webkit {
  22 namespace ppapi {
  23
  24 HostArrayBufferVar::HostArrayBufferVar(uint32 size_in_bytes)
  25     : buffer_(WebArrayBuffer::create(size_in_bytes, 1 /* element_size */)),
  26       valid_(true) {
  27 }
  28
  29 HostArrayBufferVar::HostArrayBufferVar(const WebArrayBuffer& buffer)
  30     : buffer_(buffer),
  31       valid_(true) {
  32 }
  33
  34 HostArrayBufferVar::HostArrayBufferVar(uint32 size_in_bytes,
  35                                        base::SharedMemoryHandle handle)
  36     : buffer_(WebArrayBuffer::create(size_in_bytes, 1 /* element_size */)) {
  37   base::SharedMemory s(handle, true);
  38   valid_ = s.Map(size_in_bytes);
  39   if (valid_) {
  40     memcpy(buffer_.data(), s.memory(), size_in_bytes);
  41     s.Unmap();
  42   }
  43 }
  44
  45 HostArrayBufferVar::~HostArrayBufferVar() {
  46 }
  47
  48 void* HostArrayBufferVar::Map() {
  49   if (!valid_)
  50     return NULL;
  51   return buffer_.data();
  52 }
  53
  54 void HostArrayBufferVar::Unmap() {
  55   // We do not used shared memory on the host side. Nothing to do.
  56 }
  57
  58 uint32 HostArrayBufferVar::ByteLength() {
  59   return buffer_.byteLength();
  60 }
  61
  62 bool HostArrayBufferVar::CopyToNewShmem(
  63     PP_Instance instance,
  64     int* host_shm_handle_id,
  65     base::SharedMemoryHandle* plugin_shm_handle) {
  66   webkit::ppapi::PluginInstance* i =
  67       webkit::ppapi::HostGlobals::Get()->GetInstance(instance);
  68   scoped_ptr<base::SharedMemory> shm(i->delegate()->CreateAnonymousSharedMemory(
  69       ByteLength()));
  70   if (!shm.get())
  71     return false;
  72
  73   shm->Map(ByteLength());
  74   memcpy(shm->memory(), Map(), ByteLength());
  75   shm->Unmap();
  76
  77   // Duplicate the handle here; the SharedMemory destructor closes
  78   // its handle on us.
  79   HostGlobals* hg = HostGlobals::Get();
  80   PluginModule* pm = hg->GetModule(hg->GetModuleForInstance(instance));
  81   base::ProcessId p = pm->GetPeerProcessId();
  82   if (p  == base::kNullProcessId) {
  83     // In-process, clone for ourselves.
  84     p = base::GetCurrentProcId();
  85   }
  86
  87   base::PlatformFile platform_file =
  88 #if defined(OS_WIN)
  89       shm->handle();
  90 #elif defined(OS_POSIX)
  91       shm->handle().fd;
  92 #else
  93 #error Not implemented.
  94 #endif
  95
  96   *plugin_shm_handle =
  97       i->delegate()->ShareHandleWithRemote(platform_file, p, false);
  98   *host_shm_handle_id = -1;
  99   return true;
 100 }
 101
 102 }  // namespace ppapi
 103 }  // namespace webkit