src/chrome/renderer/printing/print_web_view_helper_mac.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/renderer/printing/print_web_view_helper.h"
   6
   7 #import <AppKit/AppKit.h>
   8
   9 #include "base/logging.h"
  10 #include "base/mac/scoped_nsautorelease_pool.h"
  11 #include "base/metrics/histogram.h"
  12 #include "chrome/common/print_messages.h"
  13 #include "printing/metafile_skia_wrapper.h"
  14 #include "printing/page_size_margins.h"
  15 #include "skia/ext/platform_device.h"
  16 #include "skia/ext/vector_canvas.h"
  17 #include "third_party/WebKit/public/platform/WebCanvas.h"
  18 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  19
  20 namespace printing {
  21
  22 using blink::WebFrame;
  23
  24 void PrintWebViewHelper::PrintPageInternal(
  25     const PrintMsg_PrintPage_Params& params,
  26     WebFrame* frame) {
  27   PdfMetafileSkia metafile;
  28   if (!metafile.Init())
  29     return;
  30
  31   int page_number = params.page_number;
  32   gfx::Size page_size_in_dpi;
  33   gfx::Rect content_area_in_dpi;
  34   RenderPage(print_pages_params_->params, page_number, frame, false, &metafile,
  35              &page_size_in_dpi, &content_area_in_dpi);
  36   metafile.FinishDocument();
  37
  38   PrintHostMsg_DidPrintPage_Params page_params;
  39   page_params.data_size = metafile.GetDataSize();
  40   page_params.page_number = page_number;
  41   page_params.document_cookie = params.params.document_cookie;
  42   page_params.page_size = page_size_in_dpi;
  43   page_params.content_area = content_area_in_dpi;
  44
  45   // Ask the browser to create the shared memory for us.
  46   if (!CopyMetafileDataToSharedMem(&metafile,
  47                                    &(page_params.metafile_data_handle))) {
  48     page_params.data_size = 0;
  49   }
  50
  51   Send(new PrintHostMsg_DidPrintPage(routing_id(), page_params));
  52 }
  53
  54 bool PrintWebViewHelper::RenderPreviewPage(
  55     int page_number,
  56     const PrintMsg_Print_Params& print_params) {
  57   PrintMsg_Print_Params printParams = print_params;
  58   scoped_ptr<PdfMetafileSkia> draft_metafile;
  59   PdfMetafileSkia* initial_render_metafile = print_preview_context_.metafile();
  60
  61   bool render_to_draft = print_preview_context_.IsModifiable() &&
  62                          is_print_ready_metafile_sent_;
  63
  64   if (render_to_draft) {
  65     draft_metafile.reset(new PdfMetafileSkia());
  66     if (!draft_metafile->Init()) {
  67       print_preview_context_.set_error(
  68           PREVIEW_ERROR_MAC_DRAFT_METAFILE_INIT_FAILED);
  69       LOG(ERROR) << "Draft PdfMetafileSkia Init failed";
  70       return false;
  71     }
  72     initial_render_metafile = draft_metafile.get();
  73   }
  74
  75   base::TimeTicks begin_time = base::TimeTicks::Now();
  76   gfx::Size page_size;
  77   RenderPage(printParams, page_number, print_preview_context_.prepared_frame(),
  78              true, initial_render_metafile, &page_size, NULL);
  79   print_preview_context_.RenderedPreviewPage(
  80       base::TimeTicks::Now() - begin_time);
  81
  82   if (draft_metafile.get()) {
  83     draft_metafile->FinishDocument();
  84   } else {
  85     if (print_preview_context_.IsModifiable() &&
  86         print_preview_context_.generate_draft_pages()) {
  87       DCHECK(!draft_metafile.get());
  88       draft_metafile =
  89           print_preview_context_.metafile()->GetMetafileForCurrentPage();
  90     }
  91   }
  92   return PreviewPageRendered(page_number, draft_metafile.get());
  93 }
  94
  95 void PrintWebViewHelper::RenderPage(const PrintMsg_Print_Params& params,
  96                                     int page_number,
  97                                     WebFrame* frame,
  98                                     bool is_preview,
  99                                     PdfMetafileSkia* metafile,
 100                                     gfx::Size* page_size,
 101                                     gfx::Rect* content_rect) {
 102   double scale_factor = 1.0f;
 103   double webkit_shrink_factor = frame->getPrintPageShrink(page_number);
 104   PageSizeMargins page_layout_in_points;
 105   gfx::Rect content_area;
 106
 107   ComputePageLayoutInPointsForCss(frame, page_number, params,
 108                                   ignore_css_margins_, &scale_factor,
 109                                   &page_layout_in_points);
 110   GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, page_size,
 111                                           &content_area);
 112   if (content_rect)
 113     *content_rect = content_area;
 114
 115   scale_factor *= webkit_shrink_factor;
 116
 117   gfx::Rect canvas_area =
 118       params.display_header_footer ? gfx::Rect(*page_size) : content_area;
 119
 120   {
 121     SkBaseDevice* device = metafile->StartPageForVectorCanvas(
 122         *page_size, canvas_area, scale_factor);
 123     if (!device)
 124       return;
 125
 126     skia::RefPtr<skia::VectorCanvas> canvas =
 127         skia::AdoptRef(new skia::VectorCanvas(device));
 128     blink::WebCanvas* canvas_ptr = canvas.get();
 129     MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
 130     skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
 131     skia::SetIsPreviewMetafile(*canvas, is_preview);
 132
 133     if (params.display_header_footer) {
 134       PrintHeaderAndFooter(canvas_ptr,
 135                            page_number + 1,
 136                            print_preview_context_.total_page_count(),
 137                            *frame,
 138                            scale_factor,
 139                            page_layout_in_points,
 140                            params);
 141     }
 142     RenderPageContent(frame, page_number, canvas_area, content_area,
 143                       scale_factor, canvas_ptr);
 144   }
 145
 146   // Done printing. Close the device context to retrieve the compiled metafile.
 147   metafile->FinishPage();
 148 }
 149
 150 }  // namespace printing