Make Print API work on Windows.

chromium_src/chrome/utility/printing_handler.cc

@@ -0,0 +1,144 @@
+// Copyright 2014 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 "chrome/utility/printing_handler.h"
+
+#include "base/files/file_util.h"
+#include "base/lazy_instance.h"
+#include "base/path_service.h"
+#include "base/scoped_native_library.h"
+#include "chrome/common/print_messages.h"
+#include "content/public/utility/utility_thread.h"
+#include "pdf/pdf.h"
+#include "printing/page_range.h"
+#include "printing/pdf_render_settings.h"
+
+#if defined(OS_WIN)
+#include "printing/emf_win.h"
+#include "ui/gfx/gdi_util.h"
+#endif
+
+
+namespace {
+
+bool Send(IPC::Message* message) {
+  return content::UtilityThread::Get()->Send(message);
+}
+
+void ReleaseProcessIfNeeded() {
+  content::UtilityThread::Get()->ReleaseProcessIfNeeded();
+}
+
+}  // namespace
+
+PrintingHandler::PrintingHandler() {}
+
+PrintingHandler::~PrintingHandler() {}
+
+bool PrintingHandler::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PrintingHandler, message)
+#if defined(OS_WIN)
+    IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles,
+                        OnRenderPDFPagesToMetafile)
+    IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles_GetPage,
+                        OnRenderPDFPagesToMetafileGetPage)
+    IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles_Stop,
+                        OnRenderPDFPagesToMetafileStop)
+#endif  // OS_WIN
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+#if defined(OS_WIN)
+void PrintingHandler::OnRenderPDFPagesToMetafile(
+    IPC::PlatformFileForTransit pdf_transit,
+    const printing::PdfRenderSettings& settings) {
+  pdf_rendering_settings_ = settings;
+  base::File pdf_file = IPC::PlatformFileForTransitToFile(pdf_transit);
+  int page_count = LoadPDF(pdf_file.Pass());
+  //int page_count = 1;
+  Send(
+      new ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageCount(page_count));
+}
+
+void PrintingHandler::OnRenderPDFPagesToMetafileGetPage(
+    int page_number,
+    IPC::PlatformFileForTransit output_file) {
+  base::File emf_file = IPC::PlatformFileForTransitToFile(output_file);
+  float scale_factor = 1.0f;
+  bool success =
+      RenderPdfPageToMetafile(page_number, emf_file.Pass(), &scale_factor);
+  Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageDone(
+      success, scale_factor));
+}
+
+void PrintingHandler::OnRenderPDFPagesToMetafileStop() {
+  ReleaseProcessIfNeeded();
+}
+
+int PrintingHandler::LoadPDF(base::File pdf_file) {
+  int64 length64 = pdf_file.GetLength();
+  if (length64 <= 0 || length64 > std::numeric_limits<int>::max())
+    return 0;
+  int length = static_cast<int>(length64);
+
+  pdf_data_.resize(length);
+  if (length != pdf_file.Read(0, pdf_data_.data(), pdf_data_.size()))
+    return 0;
+
+  int total_page_count = 0;
+  if (!chrome_pdf::GetPDFDocInfo(
+          &pdf_data_.front(), pdf_data_.size(), &total_page_count, NULL)) {
+    return 0;
+  }
+  return total_page_count;
+}
+
+bool PrintingHandler::RenderPdfPageToMetafile(int page_number,
+                                              base::File output_file,
+                                              float* scale_factor) {
+  printing::Emf metafile;
+  metafile.Init();
+
+  // We need to scale down DC to fit an entire page into DC available area.
+  // Current metafile is based on screen DC and have current screen size.
+  // Writing outside of those boundaries will result in the cut-off output.
+  // On metafiles (this is the case here), scaling down will still record
+  // original coordinates and we'll be able to print in full resolution.
+  // Before playback we'll need to counter the scaling up that will happen
+  // in the service (print_system_win.cc).
+  *scale_factor =
+      gfx::CalculatePageScale(metafile.context(),
+                              pdf_rendering_settings_.area().right(),
+                              pdf_rendering_settings_.area().bottom());
+  gfx::ScaleDC(metafile.context(), *scale_factor);
+
+  // The underlying metafile is of type Emf and ignores the arguments passed
+  // to StartPage.
+  metafile.StartPage(gfx::Size(), gfx::Rect(), 1);
+  if (!chrome_pdf::RenderPDFPageToDC(
+          &pdf_data_.front(),
+          pdf_data_.size(),
+          page_number,
+          metafile.context(),
+          pdf_rendering_settings_.dpi(),
+          pdf_rendering_settings_.area().x(),
+          pdf_rendering_settings_.area().y(),
+          pdf_rendering_settings_.area().width(),
+          pdf_rendering_settings_.area().height(),
+          true,
+          false,
+          true,
+          true,
+          pdf_rendering_settings_.autorotate())) {
+    return false;
+  }
+  metafile.FinishPage();
+  metafile.FinishDocument();
+  return metafile.SaveTo(&output_file);
+}
+
+#endif  // OS_WIN

chromium_src/chrome/utility/printing_handler.h

@@ -0,0 +1,59 @@
+// Copyright 2014 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.
+
+#ifndef CHROME_UTILITY_PRINTING_HANDLER_H_
+#define CHROME_UTILITY_PRINTING_HANDLER_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "chrome/utility/utility_message_handler.h"
+#include "ipc/ipc_platform_file.h"
+#include "printing/pdf_render_settings.h"
+
+#if !defined(ENABLE_PRINT_PREVIEW) && !defined(OS_WIN)
+#error "Windows or full printing must be enabled"
+#endif
+
+namespace printing {
+class PdfRenderSettings;
+struct PwgRasterSettings;
+struct PageRange;
+}
+
+// Dispatches IPCs for printing.
+class PrintingHandler : public UtilityMessageHandler {
+ public:
+  PrintingHandler();
+  ~PrintingHandler() override;
+
+  // IPC::Listener:
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+ private:
+  // IPC message handlers.
+#if defined(OS_WIN)
+  void OnRenderPDFPagesToMetafile(IPC::PlatformFileForTransit pdf_transit,
+                                  const printing::PdfRenderSettings& settings);
+  void OnRenderPDFPagesToMetafileGetPage(
+      int page_number,
+      IPC::PlatformFileForTransit output_file);
+  void OnRenderPDFPagesToMetafileStop();
+#endif  // OS_WIN
+
+#if defined(OS_WIN)
+  int LoadPDF(base::File pdf_file);
+  bool RenderPdfPageToMetafile(int page_number,
+                               base::File output_file,
+                               float* scale_factor);
+#endif  // OS_WIN
+
+#if defined(OS_WIN)
+  std::vector<char> pdf_data_;
+  printing::PdfRenderSettings pdf_rendering_settings_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(PrintingHandler);
+};
+
+#endif  // CHROME_UTILITY_PRINTING_HANDLER_H_

chromium_src/chrome/utility/utility_message_handler.h

@@ -0,0 +1,22 @@
+// Copyright 2013 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.
+
+#ifndef CHROME_UTILITY_UTILITY_MESSAGE_HANDLER_H_
+#define CHROME_UTILITY_UTILITY_MESSAGE_HANDLER_H_
+
+namespace IPC {
+class Message;
+}
+
+class UtilityMessageHandler {
+ public:
+  virtual ~UtilityMessageHandler() {}
+
+  // Called when a message is received.  Returns true iff the message was
+  // handled.
+  virtual bool OnMessageReceived(const IPC::Message& message) = 0;
+};
+
+#endif  // CHROME_UTILITY_UTILITY_MESSAGE_HANDLER_H_
+