Pass printing result to the browser.

The resulting PDF file will now be passed to the browser and be saved as "chromium_printing_test.pdf" under current directory.

BUG=9847
TEST=printing on linux should now generate chromium_printing_test.pdf in download directory. Printing on Windows should still work.

Patch contributed by minyu.huang@gmail.com
Review URL: http://codereview.chromium.org/172115

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25615 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 47 insertions, 4 deletions

diff --git a/chrome/browser/renderer_host/resource_message_filter.cc b/chrome/browser/renderer_host/resource_message_filter.cc
index b460814..059f2af 100644
--- a/chrome/browser/renderer_host/resource_message_filter.cc
+++ b/chrome/browser/renderer_host/resource_message_filter.cc
@@ -323,7 +323,13 @@ bool ResourceMessageFilter::OnMessageReceived(const IPC::Message& msg) {
                           OnGetPreferredExtensionForMimeType)
       IPC_MESSAGE_HANDLER(ViewHostMsg_GetCPBrowsingContext,
                           OnGetCPBrowsingContext)
+#if defined(OS_WIN)
       IPC_MESSAGE_HANDLER(ViewHostMsg_DuplicateSection, OnDuplicateSection)
+#endif
+#if defined(OS_LINUX)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_AllocateShareMemory,
+                          OnAllocateShareMemory)
+#endif
       IPC_MESSAGE_HANDLER(ViewHostMsg_ResourceTypeStats, OnResourceTypeStats)
       IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_ResolveProxy, OnResolveProxy)
       IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_GetDefaultPrintSettings,
@@ -675,6 +681,7 @@ void ResourceMessageFilter::OnGetCPBrowsingContext(uint32* context) {
       CPBrowsingContextManager::Instance()->Allocate(request_context_.get());
 }
 
+#if defined(OS_WIN)
 void ResourceMessageFilter::OnDuplicateSection(
     base::SharedMemoryHandle renderer_handle,
     base::SharedMemoryHandle* browser_handle) {
@@ -683,6 +690,30 @@ void ResourceMessageFilter::OnDuplicateSection(
   base::SharedMemory shared_buf(renderer_handle, true, handle());
   shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), browser_handle);
 }
+#endif
+
+#if defined(OS_LINUX)
+void ResourceMessageFilter::OnAllocateShareMemory(
+    size_t buffer_size,
+    base::SharedMemoryHandle* browser_handle) {
+  // We don't want to allocate a super big chunk of memory.
+  // 32MB should be large enough for printing on Linux.
+  if (buffer_size > 32 * 1024 * 1024) {
+    *browser_handle = base::SharedMemory::NULLHandle();
+    NOTREACHED() << "Buffer too large: " << buffer_size;
+    return;
+  }
+  base::SharedMemory shared_buf;
+  shared_buf.Create(L"", false, false, buffer_size);
+  if (shared_buf.Map(buffer_size)) {
+    shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), browser_handle);
+  } else {
+    *browser_handle = base::SharedMemory::NULLHandle();
+    NOTREACHED() << "Cannot map buffer";
+    return;
+  }
+}
+#endif
 
 void ResourceMessageFilter::OnResourceTypeStats(
     const WebCache::ResourceTypeStats& stats) {
diff --git a/chrome/browser/renderer_host/resource_message_filter.h b/chrome/browser/renderer_host/resource_message_filter.h
index 825422b..7fd7979 100644
--- a/chrome/browser/renderer_host/resource_message_filter.h
+++ b/chrome/browser/renderer_host/resource_message_filter.h
@@ -5,6 +5,10 @@
 #ifndef CHROME_BROWSER_RENDERER_HOST_RESOURCE_MSG_FILTER_H_
 #define CHROME_BROWSER_RENDERER_HOST_RESOURCE_MSG_FILTER_H_
 
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
 #include <string>
 #include <vector>
 
@@ -26,10 +30,6 @@
 #include "ipc/ipc_channel_proxy.h"
 #include "webkit/api/public/WebCache.h"
 
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
 class AppCacheDispatcherHost;
 class AudioRendererHost;
 class Clipboard;
@@ -190,8 +190,20 @@ class ResourceMessageFilter : public IPC::ChannelProxy::MessageFilter,
   void OnGetPreferredExtensionForMimeType(const std::string& mime_type,
                                           FilePath::StringType* ext);
   void OnGetCPBrowsingContext(uint32* context);
+
+#if defined(OS_WIN)
+  // Used to pass resulting EMF from renderer to browser in printing.
   void OnDuplicateSection(base::SharedMemoryHandle renderer_handle,
                           base::SharedMemoryHandle* browser_handle);
+#endif
+
+#if defined(OS_LINUX)
+  // Used to ask the browser allocate a block of shared memory for the renderer
+  // to fill in resulting PDF in renderer.
+  void OnAllocateShareMemory(size_t buffer_size,
+                             base::SharedMemoryHandle* browser_handle);
+#endif
+
   void OnResourceTypeStats(const WebKit::WebCache::ResourceTypeStats& stats);
 
   void OnResolveProxy(const GURL& url, IPC::Message* reply_msg);