ppapi/proxy/ppp_printing_proxy.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 "ppapi/proxy/ppp_printing_proxy.h"
   6
   7 #include <string.h>
   8
   9 #include "ppapi/c/dev/ppp_printing_dev.h"
  10 #include "ppapi/proxy/host_dispatcher.h"
  11 #include "ppapi/proxy/plugin_dispatcher.h"
  12 #include "ppapi/proxy/ppapi_messages.h"
  13 #include "ppapi/shared_impl/ppapi_globals.h"
  14 #include "ppapi/shared_impl/proxy_lock.h"
  15 #include "ppapi/shared_impl/resource_tracker.h"
  16
  17 namespace ppapi {
  18 namespace proxy {
  19
  20 namespace {
  21
  22 #if !defined(OS_NACL)
  23 bool HasPrintingPermission(PP_Instance instance) {
  24   Dispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
  25   if (!dispatcher)
  26     return false;
  27   return dispatcher->permissions().HasPermission(PERMISSION_DEV);
  28 }
  29
  30 uint32_t QuerySupportedFormats(PP_Instance instance) {
  31   if (!HasPrintingPermission(instance))
  32     return 0;
  33   uint32_t result = 0;
  34   HostDispatcher::GetForInstance(instance)->Send(
  35       new PpapiMsg_PPPPrinting_QuerySupportedFormats(API_ID_PPP_PRINTING,
  36                                                      instance, &result));
  37   return result;
  38 }
  39
  40 int32_t Begin(PP_Instance instance,
  41               const struct PP_PrintSettings_Dev* print_settings) {
  42   if (!HasPrintingPermission(instance))
  43     return 0;
  44   // Settings is just serialized as a string.
  45   std::string settings_string;
  46   settings_string.resize(sizeof(*print_settings));
  47   memcpy(&settings_string[0], print_settings, sizeof(*print_settings));
  48
  49   int32_t result = 0;
  50   HostDispatcher::GetForInstance(instance)->Send(
  51       new PpapiMsg_PPPPrinting_Begin(API_ID_PPP_PRINTING, instance,
  52                                      settings_string, &result));
  53   return result;
  54 }
  55
  56 PP_Resource PrintPages(PP_Instance instance,
  57                        const PP_PrintPageNumberRange_Dev* page_ranges,
  58                        uint32_t page_range_count) {
  59   if (!HasPrintingPermission(instance))
  60     return 0;
  61   std::vector<PP_PrintPageNumberRange_Dev> pages(
  62       page_ranges, page_ranges + page_range_count);
  63
  64   HostResource result;
  65   HostDispatcher::GetForInstance(instance)->Send(
  66       new PpapiMsg_PPPPrinting_PrintPages(API_ID_PPP_PRINTING,
  67                                           instance, pages, &result));
  68
  69   // How refcounting works when returning a resource:
  70   //
  71   // The plugin in the plugin process makes a resource that it returns to the
  72   // browser. The plugin proxy code returns that ref to us and asynchronously
  73   // releases it. Before any release message associated with that operation
  74   // comes, we'll get this reply. We need to add one ref since our caller
  75   // expects us to add one ref for it to consume.
  76   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(
  77       result.host_resource());
  78   return result.host_resource();
  79 }
  80
  81 void End(PP_Instance instance) {
  82   if (!HasPrintingPermission(instance))
  83     return;
  84   HostDispatcher::GetForInstance(instance)->Send(
  85       new PpapiMsg_PPPPrinting_End(API_ID_PPP_PRINTING, instance));
  86 }
  87
  88 PP_Bool IsScalingDisabled(PP_Instance instance) {
  89   if (!HasPrintingPermission(instance))
  90     return PP_FALSE;
  91   bool result = false;
  92   HostDispatcher::GetForInstance(instance)->Send(
  93       new PpapiMsg_PPPPrinting_IsScalingDisabled(API_ID_PPP_PRINTING,
  94                                                  instance, &result));
  95   return PP_FromBool(result);
  96 }
  97
  98 const PPP_Printing_Dev ppp_printing_interface = {
  99   &QuerySupportedFormats,
 100   &Begin,
 101   &PrintPages,
 102   &End,
 103   &IsScalingDisabled
 104 };
 105 #else
 106 // The NaCl plugin doesn't need the host side interface - stub it out.
 107 static const PPP_Printing_Dev ppp_printing_interface = {};
 108 #endif  // !defined(OS_NACL)
 109
 110 }  // namespace
 111
 112 PPP_Printing_Proxy::PPP_Printing_Proxy(Dispatcher* dispatcher)
 113     : InterfaceProxy(dispatcher),
 114       ppp_printing_impl_(NULL) {
 115   if (dispatcher->IsPlugin()) {
 116     ppp_printing_impl_ = static_cast<const PPP_Printing_Dev*>(
 117         dispatcher->local_get_interface()(PPP_PRINTING_DEV_INTERFACE));
 118   }
 119 }
 120
 121 PPP_Printing_Proxy::~PPP_Printing_Proxy() {
 122 }
 123
 124 // static
 125 const PPP_Printing_Dev* PPP_Printing_Proxy::GetProxyInterface() {
 126   return &ppp_printing_interface;
 127 }
 128
 129 bool PPP_Printing_Proxy::OnMessageReceived(const IPC::Message& msg) {
 130   if (!dispatcher()->IsPlugin())
 131     return false;
 132
 133   bool handled = true;
 134   IPC_BEGIN_MESSAGE_MAP(PPP_Printing_Proxy, msg)
 135     IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_QuerySupportedFormats,
 136                         OnPluginMsgQuerySupportedFormats)
 137     IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_Begin,
 138                         OnPluginMsgBegin)
 139     IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_PrintPages,
 140                         OnPluginMsgPrintPages)
 141     IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_End,
 142                         OnPluginMsgEnd)
 143     IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_IsScalingDisabled,
 144                         OnPluginMsgIsScalingDisabled)
 145     IPC_MESSAGE_UNHANDLED(handled = false)
 146   IPC_END_MESSAGE_MAP()
 147   return handled;
 148 }
 149
 150 void PPP_Printing_Proxy::OnPluginMsgQuerySupportedFormats(PP_Instance instance,
 151                                                           uint32_t* result) {
 152   if (ppp_printing_impl_) {
 153     *result = CallWhileUnlocked(ppp_printing_impl_->QuerySupportedFormats,
 154                                 instance);
 155   } else {
 156     *result = 0;
 157   }
 158 }
 159
 160 void PPP_Printing_Proxy::OnPluginMsgBegin(PP_Instance instance,
 161                                           const std::string& settings_string,
 162                                           int32_t* result) {
 163   *result = 0;
 164
 165   PP_PrintSettings_Dev settings;
 166   if (settings_string.size() != sizeof(settings))
 167     return;
 168   memcpy(&settings, &settings_string[0], sizeof(settings));
 169
 170   if (ppp_printing_impl_) {
 171     *result = CallWhileUnlocked(ppp_printing_impl_->Begin,
 172         instance,
 173         const_cast<const PP_PrintSettings_Dev*>(&settings));
 174   }
 175 }
 176
 177 void PPP_Printing_Proxy::OnPluginMsgPrintPages(
 178     PP_Instance instance,
 179     const std::vector<PP_PrintPageNumberRange_Dev>& pages,
 180     HostResource* result) {
 181   if (!ppp_printing_impl_ || pages.empty())
 182     return;
 183
 184   PP_Resource plugin_resource = CallWhileUnlocked(
 185       ppp_printing_impl_->PrintPages,
 186       instance, &pages[0], static_cast<uint32_t>(pages.size()));
 187   ResourceTracker* resource_tracker = PpapiGlobals::Get()->GetResourceTracker();
 188   Resource* resource_object = resource_tracker->GetResource(plugin_resource);
 189   if (!resource_object)
 190     return;
 191
 192   *result = resource_object->host_resource();
 193
 194   // See PrintPages above for how refcounting works.
 195   resource_tracker->ReleaseResourceSoon(plugin_resource);
 196 }
 197
 198 void PPP_Printing_Proxy::OnPluginMsgEnd(PP_Instance instance) {
 199   if (ppp_printing_impl_)
 200     CallWhileUnlocked(ppp_printing_impl_->End, instance);
 201 }
 202
 203 void PPP_Printing_Proxy::OnPluginMsgIsScalingDisabled(PP_Instance instance,
 204                                                       bool* result) {
 205   if (ppp_printing_impl_) {
 206     *result = PP_ToBool(CallWhileUnlocked(ppp_printing_impl_->IsScalingDisabled,
 207                                           instance));
 208   } else {
 209     *result = false;
 210   }
 211 }
 212
 213 }  // namespace proxy
 214 }  // namespace ppapi