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// 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 "ppapi/proxy/ppp_printing_proxy.h"
#include <string.h>
#include "base/numerics/safe_conversions.h"
#include "build/build_config.h"
#include "ppapi/c/dev/ppp_printing_dev.h"
#include "ppapi/proxy/host_dispatcher.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/plugin_resource_tracker.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/proxy_lock.h"
#include "ppapi/shared_impl/resource_tracker.h"
namespace ppapi {
namespace proxy {
namespace {
#if !defined(OS_NACL)
bool HasPrintingPermission(PP_Instance instance) {
Dispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
if (!dispatcher)
return false;
return dispatcher->permissions().HasPermission(PERMISSION_DEV);
}
uint32_t QuerySupportedFormats(PP_Instance instance) {
if (!HasPrintingPermission(instance))
return 0;
uint32_t result = 0;
HostDispatcher::GetForInstance(instance)->Send(
new PpapiMsg_PPPPrinting_QuerySupportedFormats(API_ID_PPP_PRINTING,
instance, &result));
return result;
}
int32_t Begin(PP_Instance instance,
const PP_PrintSettings_Dev* print_settings) {
if (!HasPrintingPermission(instance))
return 0;
int32_t result = 0;
HostDispatcher::GetForInstance(instance)->Send(new PpapiMsg_PPPPrinting_Begin(
API_ID_PPP_PRINTING, instance, *print_settings, &result));
return result;
}
PP_Resource PrintPages(PP_Instance instance,
const PP_PrintPageNumberRange_Dev* page_ranges,
uint32_t page_range_count) {
if (!HasPrintingPermission(instance))
return 0;
std::vector<PP_PrintPageNumberRange_Dev> pages(
page_ranges, page_ranges + page_range_count);
HostResource result;
HostDispatcher::GetForInstance(instance)->Send(
new PpapiMsg_PPPPrinting_PrintPages(API_ID_PPP_PRINTING,
instance, pages, &result));
// Explicilty don't add a reference to the received resource here. The plugin
// adds a ref during creation of the resource and it will "abandon" the
// resource to release it, which ensures that the initial ref won't be
// decremented. See the comment below in OnPluginMsgPrintPages.
return result.host_resource();
}
void End(PP_Instance instance) {
if (!HasPrintingPermission(instance))
return;
HostDispatcher::GetForInstance(instance)->Send(
new PpapiMsg_PPPPrinting_End(API_ID_PPP_PRINTING, instance));
}
PP_Bool IsScalingDisabled(PP_Instance instance) {
if (!HasPrintingPermission(instance))
return PP_FALSE;
bool result = false;
HostDispatcher::GetForInstance(instance)->Send(
new PpapiMsg_PPPPrinting_IsScalingDisabled(API_ID_PPP_PRINTING,
instance, &result));
return PP_FromBool(result);
}
const PPP_Printing_Dev ppp_printing_interface = {
&QuerySupportedFormats,
&Begin,
&PrintPages,
&End,
&IsScalingDisabled
};
#else
// The NaCl plugin doesn't need the host side interface - stub it out.
static const PPP_Printing_Dev ppp_printing_interface = {};
#endif // !defined(OS_NACL)
} // namespace
PPP_Printing_Proxy::PPP_Printing_Proxy(Dispatcher* dispatcher)
: InterfaceProxy(dispatcher),
ppp_printing_impl_(NULL) {
if (dispatcher->IsPlugin()) {
ppp_printing_impl_ = static_cast<const PPP_Printing_Dev*>(
dispatcher->local_get_interface()(PPP_PRINTING_DEV_INTERFACE));
}
}
PPP_Printing_Proxy::~PPP_Printing_Proxy() {
}
// static
const PPP_Printing_Dev* PPP_Printing_Proxy::GetProxyInterface() {
return &ppp_printing_interface;
}
bool PPP_Printing_Proxy::OnMessageReceived(const IPC::Message& msg) {
if (!dispatcher()->IsPlugin())
return false;
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PPP_Printing_Proxy, msg)
IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_QuerySupportedFormats,
OnPluginMsgQuerySupportedFormats)
IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_Begin,
OnPluginMsgBegin)
IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_PrintPages,
OnPluginMsgPrintPages)
IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_End,
OnPluginMsgEnd)
IPC_MESSAGE_HANDLER(PpapiMsg_PPPPrinting_IsScalingDisabled,
OnPluginMsgIsScalingDisabled)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void PPP_Printing_Proxy::OnPluginMsgQuerySupportedFormats(PP_Instance instance,
uint32_t* result) {
if (ppp_printing_impl_) {
*result = CallWhileUnlocked(ppp_printing_impl_->QuerySupportedFormats,
instance);
} else {
*result = 0;
}
}
void PPP_Printing_Proxy::OnPluginMsgBegin(PP_Instance instance,
const PP_PrintSettings_Dev& settings,
int32_t* result) {
if (!ppp_printing_impl_) {
*result = 0;
return;
}
*result = CallWhileUnlocked(ppp_printing_impl_->Begin, instance, &settings);
}
void PPP_Printing_Proxy::OnPluginMsgPrintPages(
PP_Instance instance,
const std::vector<PP_PrintPageNumberRange_Dev>& pages,
HostResource* result) {
if (!ppp_printing_impl_ || pages.empty())
return;
PP_Resource plugin_resource = CallWhileUnlocked(
ppp_printing_impl_->PrintPages,
instance, &pages[0], base::checked_cast<uint32_t>(pages.size()));
ResourceTracker* resource_tracker = PpapiGlobals::Get()->GetResourceTracker();
Resource* resource_object = resource_tracker->GetResource(plugin_resource);
if (!resource_object)
return;
*result = resource_object->host_resource();
// Abandon the resource on the plugin side. This releases a reference to the
// resource and allows the plugin side of the resource (the proxy resource) to
// be destroyed without sending a message to the renderer notifing it that the
// plugin has released the resource. This used to call
// ResourceTracker::ReleaseResource directly which would trigger an IPC to be
// sent to the renderer to remove a ref to the resource. However due to
// arbitrary ordering of received sync/async IPCs in the renderer, this
// sometimes resulted in the resource being destroyed in the renderer before
// the renderer had a chance to add a reference to it. See crbug.com/490611.
static_cast<PluginResourceTracker*>(resource_tracker)
->AbandonResource(plugin_resource);
}
void PPP_Printing_Proxy::OnPluginMsgEnd(PP_Instance instance) {
if (ppp_printing_impl_)
CallWhileUnlocked(ppp_printing_impl_->End, instance);
}
void PPP_Printing_Proxy::OnPluginMsgIsScalingDisabled(PP_Instance instance,
bool* result) {
if (ppp_printing_impl_) {
*result = PP_ToBool(CallWhileUnlocked(ppp_printing_impl_->IsScalingDisabled,
instance));
} else {
*result = false;
}
}
} // namespace proxy
} // namespace ppapi
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