Print preview should use draft PDFs until it is ready to print to improve speed.

BUG=85767
TEST=none

Review URL: http://codereview.chromium.org/7149020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89198 0039d316-1c4b-4281-b951-d872f2087c98

18 files changed, 90 insertions, 13 deletions

diff --git a/chrome/browser/resources/print_preview.js b/chrome/browser/resources/print_preview.js
index 9ced90c..5902ed0 100644
--- a/chrome/browser/resources/print_preview.js
+++ b/chrome/browser/resources/print_preview.js
@@ -45,6 +45,9 @@ var hasError = false;
 // True when preview tab is hidden.
 var isTabHidden = false;
 
+// True when draft preview data is requested for preview.
+var draftDocument = true;
+
 /**
  * Window onload handler, sets up the page and starts print preview by getting
  * the printer list.
@@ -346,7 +349,8 @@ function getSettingsJSON() {
        'collate': isCollated(),
        'landscape': isLandscape(),
        'color': isColor(),
-       'printToPDF': printToPDF});
+       'printToPDF': printToPDF,
+       'draftDocument': draftDocument});
 }
 
 /**
@@ -367,9 +371,10 @@ function getSelectedPrinterName() {
  */
 function printFile() {
   hasPendingPrintFileRequest = hasPendingPreviewRequest;
+  var deviceName = getSelectedPrinterName();
 
   if (hasPendingPrintFileRequest) {
-    if (getSelectedPrinterName() != PRINT_TO_PDF) {
+    if (deviceName != PRINT_TO_PDF) {
       isTabHidden = true;
       chrome.send('hidePreview');
     }
@@ -382,7 +387,13 @@ function printFile() {
     return;
   }
 
-  if (isTabHidden || getSelectedPrinterName() == PRINT_TO_PDF) {
+  if (draftDocument) {
+    hasPendingPrintFileRequest = true;
+    requestPrintPreview();
+    return;
+  }
+
+  if (isTabHidden || deviceName == PRINT_TO_PDF) {
     sendPrintFileRequest();
   } else {
     $('print-button').classList.add('loading');
@@ -392,6 +403,7 @@ function printFile() {
     window.setTimeout(function() { sendPrintFileRequest(); }, 1000);
   }
 }
+
 /**
  * Sends a message to cancel the pending print request.
  */
@@ -413,11 +425,24 @@ function requestPrintPreview() {
   hasPendingPreviewRequest = true;
   removeEventListeners();
   printSettings.save();
-  showLoadingAnimation();
+  if (isTabHidden || hasPendingPrintFileRequest)
+    draftDocument = false;
+  else
+    showLoadingAnimation();
+
   chrome.send('getPreview', [getSettingsJSON()]);
 }
 
 /**
+ * Called from PrintPreviewUI::OnFileSelectionCancelled to notify the print
+ * preview tab regarding the file selection cancel event.
+ */
+function fileSelectionCancelled() {
+  draftDocument = true;
+  hasPendingPrintFileRequest = false;
+}
+
+/**
  * Set the default printer. If there is one, generate a print preview.
  * @param {string} printer Name of the default printer. Empty if none.
  */
diff --git a/chrome/browser/ui/webui/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview_handler.cc
index 582814d..aff52a5 100644
--- a/chrome/browser/ui/webui/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview_handler.cc
@@ -683,6 +683,11 @@ void PrintPreviewHandler::FileSelected(const FilePath& path,
   ActivateInitiatorTabAndClosePreviewTab();
 }
 
+void PrintPreviewHandler::FileSelectionCanceled(void* params) {
+  PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(web_ui_);
+  print_preview_ui->OnFileSelectionCancelled();
+}
+
 void PrintPreviewHandler::HidePreviewTab() {
   TabContentsWrapper* preview_tab_wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(preview_tab());
diff --git a/chrome/browser/ui/webui/print_preview_handler.h b/chrome/browser/ui/webui/print_preview_handler.h
index 0d91409..04e12a6 100644
--- a/chrome/browser/ui/webui/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview_handler.h
@@ -33,6 +33,7 @@ class PrintPreviewHandler : public WebUIMessageHandler,
 
   // SelectFileDialog::Listener implementation.
   virtual void FileSelected(const FilePath& path, int index, void* params);
+  virtual void FileSelectionCanceled(void* params);
 
   // Displays a modal dialog, prompting the user to select a file.
   void SelectFile(const FilePath& default_path);
diff --git a/chrome/browser/ui/webui/print_preview_ui.cc b/chrome/browser/ui/webui/print_preview_ui.cc
index 832cf52..89bcab0 100644
--- a/chrome/browser/ui/webui/print_preview_ui.cc
+++ b/chrome/browser/ui/webui/print_preview_ui.cc
@@ -69,6 +69,10 @@ void PrintPreviewUI::OnPreviewDataIsAvailable(int expected_pages_count,
                          is_preview_modifiable, ui_identifier);
 }
 
+void PrintPreviewUI::OnFileSelectionCancelled() {
+  CallJavascriptFunction("fileSelectionCancelled");
+}
+
 PrintPreviewDataService* PrintPreviewUI::print_preview_data_service() {
   return PrintPreviewDataService::GetInstance();
 }
diff --git a/chrome/browser/ui/webui/print_preview_ui.h b/chrome/browser/ui/webui/print_preview_ui.h
index 58ceda8..d55f306 100644
--- a/chrome/browser/ui/webui/print_preview_ui.h
+++ b/chrome/browser/ui/webui/print_preview_ui.h
@@ -44,6 +44,9 @@ class PrintPreviewUI : public ChromeWebUI {
   // message.
   void OnInitiatorTabClosed(const std::string& initiator_tab_url);
 
+  // Notify the Web UI renderer that file selection has been cancelled.
+  void OnFileSelectionCancelled();
+
  private:
   // Helper function
   PrintPreviewDataService* print_preview_data_service();
diff --git a/chrome/renderer/print_web_view_helper.cc b/chrome/renderer/print_web_view_helper.cc
index 079d666..ff76964 100644
--- a/chrome/renderer/print_web_view_helper.cc
+++ b/chrome/renderer/print_web_view_helper.cc
@@ -18,6 +18,7 @@
 #include "content/renderer/render_view.h"
 #include "grit/generated_resources.h"
 #include "printing/metafile.h"
+#include "printing/print_job_constants.h"
 #include "printing/units.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDataSource.h"
@@ -348,8 +349,11 @@ void PrintWebViewHelper::PrintPreview(WebKit::WebFrame* frame,
     return;
   }
 
+  bool draft;
+  settings.GetBoolean(printing::kSettingDraftDocument, &draft);
+
   // Render Pages for printing.
-  if (!RenderPagesForPreview(frame, node))
+  if (!RenderPagesForPreview(frame, node, draft))
     DidFinishPrinting(FAIL_PREVIEW);
 }
 
@@ -649,12 +653,13 @@ bool PrintWebViewHelper::RenderPagesForPrint(WebKit::WebFrame* frame,
 }
 
 bool PrintWebViewHelper::RenderPagesForPreview(WebKit::WebFrame* frame,
-                                               WebKit::WebNode* node) {
+                                               WebKit::WebNode* node,
+                                               bool draft) {
   PrintMsg_PrintPages_Params print_settings = *print_pages_params_;
   // PDF printer device supports alpha blending.
   print_settings.params.supports_alpha_blend = true;
   // TODO(kmadhusu): Handle print selection.
-  return CreatePreviewDocument(print_settings, frame, node);
+  return CreatePreviewDocument(print_settings, frame, node, draft);
 }
 
 base::TimeTicks PrintWebViewHelper::ReportPreviewPageRenderTime(
diff --git a/chrome/renderer/print_web_view_helper.h b/chrome/renderer/print_web_view_helper.h
index 0899ed7..ccae1e8 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -176,14 +176,19 @@ class PrintWebViewHelper : public RenderViewObserver ,
   bool RenderPagesForPrint(WebKit::WebFrame* frame, WebKit::WebNode* node);
 
   // Render the frame for preview.
-  bool RenderPagesForPreview(WebKit::WebFrame* frame, WebKit::WebNode* node);
+  // |draft| is true when the output is only going to the screen and not the
+  // printer.
+  bool RenderPagesForPreview(WebKit::WebFrame* frame,
+                             WebKit::WebNode* node,
+                             bool draft);
 
   // Renders all the pages listed in |params| for preview.
   // On success, Send PrintHostMsg_PagesReadyForPreview message with a
   // valid metafile data handle.
   bool CreatePreviewDocument(const PrintMsg_PrintPages_Params& params,
                              WebKit::WebFrame* frame,
-                             WebKit::WebNode* node);
+                             WebKit::WebNode* node,
+                             bool draft);
 
   // Platform specific helper function for rendering page(s) to |metafile|.
 #if defined(OS_WIN)
diff --git a/chrome/renderer/print_web_view_helper_linux.cc b/chrome/renderer/print_web_view_helper_linux.cc
index 08042b9..bb7a642 100644
--- a/chrome/renderer/print_web_view_helper_linux.cc
+++ b/chrome/renderer/print_web_view_helper_linux.cc
@@ -27,9 +27,10 @@ using WebKit::WebNode;
 
 bool PrintWebViewHelper::CreatePreviewDocument(
     const PrintMsg_PrintPages_Params& params, WebKit::WebFrame* frame,
-    WebKit::WebNode* node) {
+    WebKit::WebNode* node, bool draft) {
   int page_count = 0;
   printing::PreviewMetafile metafile;
+  metafile.set_draft(draft);
   if (!metafile.Init())
     return false;
 
diff --git a/chrome/renderer/print_web_view_helper_mac.mm b/chrome/renderer/print_web_view_helper_mac.mm
index e46320e..9105a11 100644
--- a/chrome/renderer/print_web_view_helper_mac.mm
+++ b/chrome/renderer/print_web_view_helper_mac.mm
@@ -55,7 +55,7 @@ void PrintWebViewHelper::PrintPageInternal(
 
 bool PrintWebViewHelper::CreatePreviewDocument(
     const PrintMsg_PrintPages_Params& params, WebKit::WebFrame* frame,
-    WebKit::WebNode* node) {
+    WebKit::WebNode* node, bool draft) {
   PrintMsg_Print_Params printParams = params.params;
   UpdatePrintableSizeInPrintParameters(frame, node, &printParams);
 
@@ -67,6 +67,7 @@ bool PrintWebViewHelper::CreatePreviewDocument(
     return false;
 
   printing::PreviewMetafile metafile;
+  metafile.set_draft(draft);
   if (!metafile.Init())
     return false;
 
diff --git a/chrome/renderer/print_web_view_helper_win.cc b/chrome/renderer/print_web_view_helper_win.cc
index 8f55288..58cb354 100644
--- a/chrome/renderer/print_web_view_helper_win.cc
+++ b/chrome/renderer/print_web_view_helper_win.cc
@@ -125,7 +125,7 @@ void PrintWebViewHelper::PrintPageInternal(
 
 bool PrintWebViewHelper::CreatePreviewDocument(
     const PrintMsg_PrintPages_Params& params, WebKit::WebFrame* frame,
-    WebKit::WebNode* node) {
+    WebKit::WebNode* node, bool draft) {
   int page_count = 0;
   PrintMsg_Print_Params print_params = params.params;
   UpdatePrintableSizeInPrintParameters(frame, node, &print_params);
@@ -136,6 +136,7 @@ bool PrintWebViewHelper::CreatePreviewDocument(
     return false;
 
   scoped_ptr<Metafile> metafile(new printing::PreviewMetafile);
+  metafile->set_draft(draft);
   metafile->Init();
 
   // Calculate the dpi adjustment.
diff --git a/printing/emf_win.h b/printing/emf_win.h
index f7e0ed5..7b8dab6 100644
--- a/printing/emf_win.h
+++ b/printing/emf_win.h
@@ -84,6 +84,8 @@ class Emf : public Metafile {
     return emf_;
   }
 
+  virtual void set_draft(bool /* draft */) const {}
+
  private:
   FRIEND_TEST_ALL_PREFIXES(EmfTest, DC);
   FRIEND_TEST_ALL_PREFIXES(EmfPrintingTest, PageBreak);
diff --git a/printing/metafile.h b/printing/metafile.h
index 84c0556..2ec1d78 100644
--- a/printing/metafile.h
+++ b/printing/metafile.h
@@ -143,6 +143,11 @@ class Metafile {
   // Returns true if writing succeeded.
   virtual bool SaveToFD(const base::FileDescriptor& fd) const = 0;
 #endif  // if defined(OS_CHROMEOS)
+
+  // Sets the flag to create a draft metafile.
+  // NOTE: Draft metafile does not include font embedding, compression, etc.
+  // This is currently used only in print preview workflow.
+  virtual void set_draft(bool draft) const = 0;
 };
 
 }  // namespace printing
diff --git a/printing/pdf_metafile_cairo_linux.h b/printing/pdf_metafile_cairo_linux.h
index 6f07ae0..7919980 100644
--- a/printing/pdf_metafile_cairo_linux.h
+++ b/printing/pdf_metafile_cairo_linux.h
@@ -60,6 +60,8 @@ class PdfMetafileCairo : public Metafile {
   virtual bool SaveToFD(const base::FileDescriptor& fd) const;
 #endif  // if defined(OS_CHROMEOS)
 
+  virtual void set_draft(bool /* draft */) const {}
+
  private:
   // Cleans up all resources.
   void CleanUpAll();
diff --git a/printing/pdf_metafile_cg_mac.h b/printing/pdf_metafile_cg_mac.h
index 5a7f56d..303cfd5 100644
--- a/printing/pdf_metafile_cg_mac.h
+++ b/printing/pdf_metafile_cg_mac.h
@@ -65,6 +65,8 @@ class PdfMetafileCg : public Metafile, public base::ThreadChecker {
                           bool center_horizontally,
                           bool center_vertically) const;
 
+  virtual void set_draft(bool /* draft */) const {}
+
  private:
   // Returns a CGPDFDocumentRef version of pdf_data_.
   CGPDFDocumentRef GetPDFDocument() const;
diff --git a/printing/pdf_metafile_skia.cc b/printing/pdf_metafile_skia.cc
index beda36f..bcb5af93 100644
--- a/printing/pdf_metafile_skia.cc
+++ b/printing/pdf_metafile_skia.cc
@@ -195,6 +195,11 @@ bool PdfMetafileSkia::SaveToFD(const base::FileDescriptor& fd) const {
 }
 #endif
 
-PdfMetafileSkia::PdfMetafileSkia() : data_(new PdfMetafileSkiaData) {}
+PdfMetafileSkia::PdfMetafileSkia()
+    : data_(new PdfMetafileSkiaData),
+      draft_(false) {}
 
+void PdfMetafileSkia::set_draft(bool draft) const {
+  draft_ = draft;
+}
 }  // namespace printing
diff --git a/printing/pdf_metafile_skia.h b/printing/pdf_metafile_skia.h
index 0ad2afb..3d1c7bd 100644
--- a/printing/pdf_metafile_skia.h
+++ b/printing/pdf_metafile_skia.h
@@ -59,9 +59,15 @@ class PdfMetafileSkia : public Metafile {
 #if defined(OS_CHROMEOS)
   virtual bool SaveToFD(const base::FileDescriptor& fd) const;
 #endif  // if defined(OS_CHROMEOS)
+
+  virtual void set_draft(bool draft) const;
+
  private:
   scoped_ptr<PdfMetafileSkiaData> data_;
 
+  // True when a draft version of metafile is requested.
+  mutable bool draft_;
+
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };
 
diff --git a/printing/print_job_constants.cc b/printing/print_job_constants.cc
index d8eb0ce..5f72252 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -39,4 +39,7 @@ const char kSettingPrinterName[] = "printerName";
 // Print to PDF option: true if selected, false if not.
 const char kSettingPrintToPDF[] = "printToPDF";
 
+// True when draft preview document is required.
+const char kSettingDraftDocument[] = "draftDocument";
+
 }  // namespace printing
diff --git a/printing/print_job_constants.h b/printing/print_job_constants.h
index 0f43b7f..8ee5e7f 100644
--- a/printing/print_job_constants.h
+++ b/printing/print_job_constants.h
@@ -11,6 +11,7 @@ extern const char kSettingCollate[];
 extern const char kSettingColor[];
 extern const char kSettingCopies[];
 extern const char kSettingDeviceName[];
+extern const char kSettingDraftDocument[];
 extern const char kSettingDuplexMode[];
 extern const char kSettingLandscape[];
 extern const char kSettingPageRange[];