components/printing/renderer/print_web_view_helper_pdf_win.cc

   1 // Copyright 2014 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 "components/printing/renderer/print_web_view_helper.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/process/process_handle.h"
  10 #include "components/printing/common/print_messages.h"
  11 #include "content/public/renderer/render_thread.h"
  12 #include "printing/metafile_skia_wrapper.h"
  13 #include "printing/page_size_margins.h"
  14 #include "printing/pdf_metafile_skia.h"
  15 #include "printing/units.h"
  16 #include "skia/ext/platform_device.h"
  17 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  18
  19 namespace printing {
  20
  21 using blink::WebFrame;
  22
  23 bool PrintWebViewHelper::RenderPreviewPage(
  24     int page_number,
  25     const PrintMsg_Print_Params& print_params) {
  26   PrintMsg_PrintPage_Params page_params;
  27   page_params.params = print_params;
  28   page_params.page_number = page_number;
  29   scoped_ptr<PdfMetafileSkia> draft_metafile;
  30   PdfMetafileSkia* initial_render_metafile = print_preview_context_.metafile();
  31   if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
  32     draft_metafile.reset(new PdfMetafileSkia);
  33     initial_render_metafile = draft_metafile.get();
  34   }
  35
  36   base::TimeTicks begin_time = base::TimeTicks::Now();
  37   PrintPageInternal(page_params,
  38                     print_preview_context_.prepared_frame(),
  39                     initial_render_metafile,
  40                     NULL,
  41                     NULL);
  42   print_preview_context_.RenderedPreviewPage(
  43       base::TimeTicks::Now() - begin_time);
  44   if (draft_metafile.get()) {
  45     draft_metafile->FinishDocument();
  46   } else if (print_preview_context_.IsModifiable() &&
  47              print_preview_context_.generate_draft_pages()) {
  48     DCHECK(!draft_metafile.get());
  49     draft_metafile =
  50         print_preview_context_.metafile()->GetMetafileForCurrentPage();
  51   }
  52   return PreviewPageRendered(page_number, draft_metafile.get());
  53 }
  54
  55 bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
  56                                           int page_count) {
  57   PdfMetafileSkia metafile;
  58   if (!metafile.Init())
  59     return false;
  60
  61   const PrintMsg_PrintPages_Params& params = *print_pages_params_;
  62   std::vector<int> printed_pages;
  63   if (params.pages.empty()) {
  64     for (int i = 0; i < page_count; ++i) {
  65       printed_pages.push_back(i);
  66     }
  67   } else {
  68     // TODO(vitalybuka): redesign to make more code cross platform.
  69     for (size_t i = 0; i < params.pages.size(); ++i) {
  70       if (params.pages[i] >= 0 && params.pages[i] < page_count) {
  71         printed_pages.push_back(params.pages[i]);
  72       }
  73     }
  74   }
  75   if (printed_pages.empty())
  76     return false;
  77
  78   std::vector<gfx::Size> page_size_in_dpi(printed_pages.size());
  79   std::vector<gfx::Rect> content_area_in_dpi(printed_pages.size());
  80
  81   PrintMsg_PrintPage_Params page_params;
  82   page_params.params = params.params;
  83   for (size_t i = 0; i < printed_pages.size(); ++i) {
  84     page_params.page_number = printed_pages[i];
  85     PrintPageInternal(page_params,
  86                       frame,
  87                       &metafile,
  88                       &page_size_in_dpi[i],
  89                       &content_area_in_dpi[i]);
  90   }
  91
  92   // blink::printEnd() for PDF should be called before metafile is closed.
  93   FinishFramePrinting();
  94
  95   metafile.FinishDocument();
  96
  97   PrintHostMsg_DidPrintPage_Params printed_page_params;
  98   if (!CopyMetafileDataToSharedMem(
  99           metafile, &printed_page_params.metafile_data_handle)) {
 100     return false;
 101   }
 102
 103   printed_page_params.content_area = params.params.printable_area;
 104   printed_page_params.data_size = metafile.GetDataSize();
 105   printed_page_params.document_cookie = params.params.document_cookie;
 106   printed_page_params.page_size = params.params.page_size;
 107
 108   for (size_t i = 0; i < printed_pages.size(); ++i) {
 109     printed_page_params.page_number = printed_pages[i];
 110     printed_page_params.page_size = page_size_in_dpi[i];
 111     printed_page_params.content_area = content_area_in_dpi[i];
 112     Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
 113     printed_page_params.metafile_data_handle = INVALID_HANDLE_VALUE;
 114   }
 115   return true;
 116 }
 117
 118 void PrintWebViewHelper::PrintPageInternal(
 119     const PrintMsg_PrintPage_Params& params,
 120     WebFrame* frame,
 121     PdfMetafileSkia* metafile,
 122     gfx::Size* page_size_in_dpi,
 123     gfx::Rect* content_area_in_dpi) {
 124   PageSizeMargins page_layout_in_points;
 125   double css_scale_factor = 1.0f;
 126   ComputePageLayoutInPointsForCss(frame, params.page_number, params.params,
 127                                   ignore_css_margins_, &css_scale_factor,
 128                                   &page_layout_in_points);
 129   gfx::Size page_size;
 130   gfx::Rect content_area;
 131   GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, &page_size,
 132                                           &content_area);
 133   int dpi = static_cast<int>(params.params.dpi);
 134   // Calculate the actual page size and content area in dpi.
 135   if (page_size_in_dpi) {
 136     *page_size_in_dpi =
 137         gfx::Size(static_cast<int>(ConvertUnitDouble(page_size.width(),
 138                                                      kPointsPerInch, dpi)),
 139                   static_cast<int>(ConvertUnitDouble(page_size.height(),
 140                                                      kPointsPerInch, dpi)));
 141   }
 142
 143   if (content_area_in_dpi) {
 144     // Output PDF matches paper size and should be printer edge to edge.
 145     *content_area_in_dpi =
 146         gfx::Rect(0, 0, page_size_in_dpi->width(), page_size_in_dpi->height());
 147   }
 148
 149   gfx::Rect canvas_area =
 150       params.params.display_header_footer ? gfx::Rect(page_size) : content_area;
 151
 152   float webkit_page_shrink_factor =
 153       frame->getPrintPageShrink(params.page_number);
 154   float scale_factor = css_scale_factor * webkit_page_shrink_factor;
 155
 156   skia::PlatformCanvas* canvas =
 157       metafile->GetVectorCanvasForNewPage(page_size, canvas_area, scale_factor);
 158   if (!canvas)
 159     return;
 160
 161   MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
 162   skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
 163
 164 #if defined(ENABLE_PRINT_PREVIEW)
 165   if (params.params.display_header_footer) {
 166     // |page_number| is 0-based, so 1 is added.
 167     PrintHeaderAndFooter(canvas, params.page_number + 1,
 168                          print_preview_context_.total_page_count(), *frame,
 169                          scale_factor, page_layout_in_points, params.params);
 170   }
 171 #endif  // defined(ENABLE_PRINT_PREVIEW)
 172
 173   float webkit_scale_factor =
 174       RenderPageContent(frame, params.page_number, canvas_area, content_area,
 175                         scale_factor, canvas);
 176   DCHECK_GT(webkit_scale_factor, 0.0f);
 177   // Done printing. Close the canvas to retrieve the compiled metafile.
 178   if (!metafile->FinishPage())
 179     NOTREACHED() << "metafile failed";
 180 }
 181
 182 bool PrintWebViewHelper::CopyMetafileDataToSharedMem(
 183     const PdfMetafileSkia& metafile,
 184     base::SharedMemoryHandle* shared_mem_handle) {
 185   uint32_t buf_size = metafile.GetDataSize();
 186   if (buf_size == 0)
 187     return false;
 188
 189   base::SharedMemory shared_buf;
 190   // Allocate a shared memory buffer to hold the generated metafile data.
 191   if (!shared_buf.CreateAndMapAnonymous(buf_size))
 192     return false;
 193
 194   // Copy the bits into shared memory.
 195   if (!metafile.GetData(shared_buf.memory(), buf_size))
 196     return false;
 197
 198   if (!shared_buf.GiveToProcess(base::GetCurrentProcessHandle(),
 199                                 shared_mem_handle)) {
 200     return false;
 201   }
 202
 203   Send(new PrintHostMsg_DuplicateSection(routing_id(), *shared_mem_handle,
 204                                          shared_mem_handle));
 205   return true;
 206 }
 207
 208 }  // namespace printing