Printing on Windows via PDF

chrome/utility/chrome_content_utility_client.cc

Index: chrome/utility/chrome_content_utility_client.cc
diff --git a/chrome/utility/chrome_content_utility_client.cc b/chrome/utility/chrome_content_utility_client.cc
index 1ca9c94f4627ae2a1d24b09ca4ea12bcb5ef532c..ecd9ac50506ceae9f492ad95a6290c5f6f138fcc 100644
--- a/chrome/utility/chrome_content_utility_client.cc
+++ b/chrome/utility/chrome_content_utility_client.cc
@@ -170,7 +170,7 @@ class PdfFunctionsBase {
       const base::FilePath& pdf_module_path,
       const base::ScopedNativeLibrary& pdf_lib) {
     return true;
-  };
+  }
 
  private:
   // Exported by PDF plugin.
@@ -365,6 +365,8 @@ bool ChromeContentUtilityClient::OnMessageReceived(
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_DecodeImageBase64, OnDecodeImageBase64)
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafile,
                         OnRenderPDFPagesToMetafile)
+    IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFToMetafile,
+                        OnRenderPDFToMetafile)
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToPWGRaster,
                         OnRenderPDFPagesToPWGRaster)
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RobustJPEGDecodeImage,
@@ -590,6 +592,69 @@ void ChromeContentUtilityClient::OnRenderPDFPagesToMetafile(
   ReleaseProcessIfNeeded();
 }
 
+#if defined(OS_WIN)
+void ChromeContentUtilityClient::OnRenderPDFToMetafile(
+    base::PlatformFile pdf_transit,
+    const base::FilePath& metafile_path,
+    const printing::PdfRenderSettings& settings) {
+  base::PlatformFile pdf_file =
+      IPC::PlatformFileForTransitToPlatformFile(pdf_transit);
+  bool succeeded = false;
+  int highest_rendered_page_number = -1;
+  double scale_factor = 1.0;
+
+  if (!g_pdf_lib.Get().IsValid())
+    return;
+
+  DWORD length = ::GetFileSize(pdf_file, NULL);
+  if (length == INVALID_FILE_SIZE)
+    return;
+
+  std::vector<uint8> buffer;
+  buffer.resize(length);
+  DWORD bytes_read = 0;
+  if (!ReadFile(pdf_file, &buffer.front(), length, &bytes_read, NULL) ||
+      (bytes_read != length)) {
+    return;
+  }
+
+  int total_page_count = 0;
+  if (!g_pdf_lib.Get().GetPDFDocInfo(&buffer.front(), buffer.size(),
+                                     &total_page_count, NULL)) {
+    return;
+  }
+
+  for (int i = 0; i < total_page_count; ++i) {
+    printing::Emf metafile;
+    metafile.InitToFile(
+        metafile_path.InsertBeforeExtensionASCII(base::StringPrintf(".%d", i)));
+    scale_factor = gfx::CalculatePageScale(
+        metafile.context(), settings.area().right(), settings.area().bottom());
+    gfx::ScaleDC(metafile.context(), scale_factor);
+    metafile.StartPage(gfx::Size(), gfx::Rect(), 1);
+    if (g_pdf_lib.Get().RenderPDFPageToDC(
+          &buffer.front(), buffer.size(), i, metafile.context(),
+          settings.dpi(), settings.dpi(), settings.area().x(),
+          settings.area().y(), settings.area().width(),
+          settings.area().height(), true, false, true, true,
+          settings.autorotate())) {
+      if (highest_rendered_page_number < i)
+        highest_rendered_page_number = i;
+    }
+    metafile.FinishPage();
+    metafile.FinishDocument();
+  }
+
+  if (highest_rendered_page_number >= 0) {
+    Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Succeeded(
+        highest_rendered_page_number, scale_factor));

[Vitaly Buka (NO REVIEWS), 2014/05/14 03:51:18]

Actually with this approach we could send success message for every page, so
browser can start spooling early.

+  } else {
+    Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafile_Failed());
+  }
+  ReleaseProcessIfNeeded();
+}
+#endif  // defined(OS_WIN)
+
 void ChromeContentUtilityClient::OnRenderPDFPagesToPWGRaster(
     IPC::PlatformFileForTransit pdf_transit,
     const printing::PdfRenderSettings& settings,