Unify some platform-specific methods for PrintWebViewHelper.

components/printing/renderer/print_web_view_helper.cc

 // 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 "components/printing/renderer/print_web_view_helper.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string>
 #include <utility>
@@ skipping 11 matching lines @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "components/printing/common/print_messages.h"
 #include "content/public/common/web_preferences.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "grit/components_resources.h"
 #include "net/base/escape.h"
+#include "printing/metafile_skia_wrapper.h"
 #include "printing/pdf_metafile_skia.h"
 #include "printing/units.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebFrameClient.h"
 #include "third_party/WebKit/public/web/WebFrameOwnerProperties.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
@@ skipping 1172 matching lines @@
       DCHECK(print_preview_context_.IsModifiable() ||
              print_preview_context_.IsFinalPageRendered());
       if (!FinalizePrintReadyDocument())
         return false;
     }
   }
   print_preview_context_.Finished();
   return true;
 }
 
+#if !defined(OS_MACOSX) && defined(ENABLE_PRINT_PREVIEW)
+bool PrintWebViewHelper::RenderPreviewPage(
+    int page_number,
+    const PrintMsg_Print_Params& print_params) {
+  PrintMsg_PrintPage_Params page_params;
+  page_params.params = print_params;
+  page_params.page_number = page_number;
+  scoped_ptr<PdfMetafileSkia> draft_metafile;

[Vitaly Buka corp, 2016/01/04 21:09:32]

I'd put empty line to separate page_params and draft_metafile initialization.

+  PdfMetafileSkia* initial_render_metafile = print_preview_context_.metafile();
+  if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
+    draft_metafile.reset(new PdfMetafileSkia);
+    initial_render_metafile = draft_metafile.get();
+  }
+
+  base::TimeTicks begin_time = base::TimeTicks::Now();
+  PrintPageInternal(page_params, print_preview_context_.prepared_frame(),
+                    initial_render_metafile, nullptr, nullptr);
+  print_preview_context_.RenderedPreviewPage(
+      base::TimeTicks::Now() - begin_time);
+  if (draft_metafile.get()) {

[Vitaly Buka corp, 2016/01/04 21:09:32]

if (draft_metafile) {

+    draft_metafile->FinishDocument();
+  } else if (print_preview_context_.IsModifiable() &&
+             print_preview_context_.generate_draft_pages()) {
+    DCHECK(!draft_metafile.get());

[Vitaly Buka corp, 2016/01/04 21:09:32]

seems DCHECK is not very useful here

+    draft_metafile =
+        print_preview_context_.metafile()->GetMetafileForCurrentPage();
+  }
+  return PreviewPageRendered(page_number, draft_metafile.get());
+}
+#endif  // !defined(OS_MACOSX) && defined(ENABLE_PRINT_PREVIEW)
+
 bool PrintWebViewHelper::FinalizePrintReadyDocument() {
   DCHECK(!is_print_ready_metafile_sent_);
   print_preview_context_.FinalizePrintReadyDocument();
 
   PdfMetafileSkia* metafile = print_preview_context_.metafile();
   PrintHostMsg_DidPreviewDocument_Params preview_params;
 
   // Ask the browser to create the shared memory for us.
   if (!CopyMetafileDataToSharedMem(*metafile,
                                    &(preview_params.metafile_data_handle))) {
@@ skipping 446 matching lines @@
   DCHECK(!print_pages_params_->params.selection_only ||
          print_pages_params_->pages.empty());
   prep_frame_view_->CopySelectionIfNeeded(
       render_view()->GetWebkitPreferences(),
       base::Bind(&PrintWebViewHelper::OnFramePreparedForPrintPages,
                  base::Unretained(this)));
   return true;
 }
 #endif  // defined(ENABLE_BASIC_PRINTING)
 
-#if defined(OS_POSIX)
+#if !defined(OS_MACOSX)
+void PrintWebViewHelper::PrintPageInternal(
+    const PrintMsg_PrintPage_Params& params,
+    blink::WebFrame* frame,
+    PdfMetafileSkia* metafile,
+    gfx::Size* page_size_in_dpi,
+    gfx::Rect* content_area_in_dpi) {
+  PageSizeMargins page_layout_in_points;
+  double css_scale_factor = 1.0f;
+  ComputePageLayoutInPointsForCss(frame, params.page_number, params.params,
+                                  ignore_css_margins_, &css_scale_factor,
+                                  &page_layout_in_points);
+  gfx::Size page_size;
+  gfx::Rect content_area;
+  GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, &page_size,
+                                          &content_area);
+  int dpi = static_cast<int>(params.params.dpi);
+  // Calculate the actual page size and content area in dpi.
+  if (page_size_in_dpi) {
+    *page_size_in_dpi =
+        gfx::Size(static_cast<int>(ConvertUnitDouble(page_size.width(),
+                                                     kPointsPerInch, dpi)),
+                  static_cast<int>(ConvertUnitDouble(page_size.height(),
+                                                     kPointsPerInch, dpi)));
+  }
+
+  if (content_area_in_dpi) {
+    // Output PDF matches paper size and should be printer edge to edge.
+    *content_area_in_dpi =
+        gfx::Rect(0, 0, page_size_in_dpi->width(), page_size_in_dpi->height());
+  }
+
+  gfx::Rect canvas_area =
+      params.params.display_header_footer ? gfx::Rect(page_size) : content_area;
+
+#if defined(OS_WIN) || defined(ENABLE_PRINT_PREVIEW)
+  float webkit_page_shrink_factor =
+      frame->getPrintPageShrink(params.page_number);
+  float scale_factor = css_scale_factor * webkit_page_shrink_factor;
+#endif
+  // TODO(thestig) GetVectorCanvasForNewPage() and RenderPageContent() take a
+  // different scale factor vs Windows. Figure out why and combine the two.
+#if defined(OS_WIN)
+  float platform_scale_factor = scale_factor;
+#else
+  float platform_scale_factor = css_scale_factor;
+#endif  // defined(OS_WIN)
+
+  skia::PlatformCanvas* canvas = metafile->GetVectorCanvasForNewPage(
+      page_size, canvas_area, platform_scale_factor);
+  if (!canvas)
+    return;
+
+  MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
+
+#if defined(ENABLE_PRINT_PREVIEW)
+  if (params.params.display_header_footer) {
+    // |page_number| is 0-based, so 1 is added.
+    PrintHeaderAndFooter(canvas, params.page_number + 1,
+                         print_preview_context_.total_page_count(), *frame,
+                         scale_factor, page_layout_in_points, params.params);
+  }
+#endif  // defined(ENABLE_PRINT_PREVIEW)
+
+  float webkit_scale_factor =
+      RenderPageContent(frame, params.page_number, canvas_area, content_area,
+                        platform_scale_factor, canvas);
+  DCHECK_GT(webkit_scale_factor, 0.0f);
+
+  // Done printing. Close the canvas to retrieve the compiled metafile.
+  if (!metafile->FinishPage())
+    NOTREACHED() << "metafile failed";
+}
+#endif  // !defined(OS_MACOSX)
+
 bool PrintWebViewHelper::CopyMetafileDataToSharedMem(
     const PdfMetafileSkia& metafile,
     base::SharedMemoryHandle* shared_mem_handle) {
   uint32_t buf_size = metafile.GetDataSize();
   if (buf_size == 0)
     return false;
 
+#if defined(OS_WIN)
+  base::SharedMemory shared_buf;
+  // Allocate a shared memory buffer to hold the generated metafile data.
+  if (!shared_buf.CreateAndMapAnonymous(buf_size))
+    return false;
+
+  // Copy the bits into shared memory.
+  if (!metafile.GetData(shared_buf.memory(), buf_size))
+    return false;
+
+  if (!shared_buf.GiveToProcess(base::GetCurrentProcessHandle(),
+                                shared_mem_handle)) {
+    return false;
+  }
+
+  Send(new PrintHostMsg_DuplicateSection(routing_id(), *shared_mem_handle,
+                                         shared_mem_handle));
+  return true;
+#else
   scoped_ptr<base::SharedMemory> shared_buf(
       content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(buf_size));
   if (!shared_buf)
     return false;
 
   if (!shared_buf->Map(buf_size))
     return false;
 
   if (!metafile.GetData(shared_buf->memory(), buf_size))
     return false;
 
   return shared_buf->GiveToProcess(base::GetCurrentProcessHandle(),
                                    shared_mem_handle);
+#endif  // defined(OS_WIN)
 }
-#endif  // defined(OS_POSIX)
 
 #if defined(ENABLE_PRINT_PREVIEW)
 void PrintWebViewHelper::ShowScriptedPrintPreview() {
   if (is_scripted_preview_delayed_) {
     is_scripted_preview_delayed_ = false;
     Send(new PrintHostMsg_ShowScriptedPrintPreview(
         routing_id(), print_preview_context_.IsModifiable()));
   }
 }
 
@@ skipping 401 matching lines @@
       blink::WebConsoleMessage::LevelWarning, message));
   return false;
 }
 
 void PrintWebViewHelper::ScriptingThrottler::Reset() {
   // Reset counter on successful print.
   count_ = 0;
 }
 
 }  // namespace printing