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.h"
  14 #include "printing/metafile_impl.h"
  15 #include "printing/metafile_skia_wrapper.h"
  16 #include "printing/page_size_margins.h"
  17 #include "skia/ext/platform_device.h"
  18 #include "skia/ext/vector_canvas.h"
  19 #include "third_party/WebKit/public/platform/WebCanvas.h"
  20 #include "third_party/WebKit/public/web/WebFrame.h"
  21
  22 namespace printing {
  23
  24 using WebKit::WebFrame;
  25
  26 void PrintWebViewHelper::PrintPageInternal(
  27     const PrintMsg_PrintPage_Params& params,
  28     const gfx::Size& canvas_size,
  29     WebFrame* frame) {
  30   NativeMetafile metafile;
  31   if (!metafile.Init())
  32     return;
  33
  34   int page_number = params.page_number;
  35   gfx::Size page_size_in_dpi;
  36   gfx::Rect content_area_in_dpi;
  37   RenderPage(print_pages_params_->params, page_number, frame, false, &metafile,
  38              &page_size_in_dpi, &content_area_in_dpi);
  39   metafile.FinishDocument();
  40
  41   PrintHostMsg_DidPrintPage_Params page_params;
  42   page_params.data_size = metafile.GetDataSize();
  43   page_params.page_number = page_number;
  44   page_params.document_cookie = params.params.document_cookie;
  45   page_params.page_size = page_size_in_dpi;
  46   page_params.content_area = content_area_in_dpi;
  47
  48   // Ask the browser to create the shared memory for us.
  49   if (!CopyMetafileDataToSharedMem(&metafile,
  50                                    &(page_params.metafile_data_handle))) {
  51     page_params.data_size = 0;
  52   }
  53
  54   Send(new PrintHostMsg_DidPrintPage(routing_id(), page_params));
  55 }
  56
  57 bool PrintWebViewHelper::RenderPreviewPage(
  58     int page_number,
  59     const PrintMsg_Print_Params& print_params) {
  60   PrintMsg_Print_Params printParams = print_params;
  61   scoped_ptr<Metafile> draft_metafile;
  62   Metafile* initial_render_metafile = print_preview_context_.metafile();
  63
  64   bool render_to_draft = print_preview_context_.IsModifiable() &&
  65                          is_print_ready_metafile_sent_;
  66
  67   if (render_to_draft) {
  68     draft_metafile.reset(new PreviewMetafile());
  69     if (!draft_metafile->Init()) {
  70       print_preview_context_.set_error(
  71           PREVIEW_ERROR_MAC_DRAFT_METAFILE_INIT_FAILED);
  72       LOG(ERROR) << "Draft PreviewMetafile Init failed";
  73       return false;
  74     }
  75     initial_render_metafile = draft_metafile.get();
  76   }
  77
  78   base::TimeTicks begin_time = base::TimeTicks::Now();
  79   gfx::Size page_size;
  80   RenderPage(printParams, page_number, print_preview_context_.prepared_frame(),
  81              true, initial_render_metafile, &page_size, NULL);
  82   print_preview_context_.RenderedPreviewPage(
  83       base::TimeTicks::Now() - begin_time);
  84
  85   if (draft_metafile.get()) {
  86     draft_metafile->FinishDocument();
  87   } else {
  88     if (print_preview_context_.IsModifiable() &&
  89         print_preview_context_.generate_draft_pages()) {
  90       DCHECK(!draft_metafile.get());
  91       draft_metafile.reset(
  92           print_preview_context_.metafile()->GetMetafileForCurrentPage());
  93     }
  94   }
  95   return PreviewPageRendered(page_number, draft_metafile.get());
  96 }
  97
  98 void PrintWebViewHelper::RenderPage(
  99     const PrintMsg_Print_Params& params, int page_number, WebFrame* frame,
 100     bool is_preview, Metafile* metafile, 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     WebKit::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 (print_pages_params_->params.display_header_footer) {
 134       PrintHeaderAndFooter(canvas_ptr, page_number + 1,
 135                            print_preview_context_.total_page_count(),
 136                            scale_factor, page_layout_in_points,
 137                            *header_footer_info_, params);
 138     }
 139     RenderPageContent(frame, page_number, canvas_area, content_area,
 140                       scale_factor, canvas_ptr);
 141   }
 142
 143   // Done printing. Close the device context to retrieve the compiled metafile.
 144   metafile->FinishPage();
 145 }
 146
 147 }  // namespace printing