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      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 #include "base/logging.h"
      8 #include "base/memory/scoped_ptr.h"
      9 #include "chrome/common/print_messages.h"
     10 #include "content/public/renderer/render_thread.h"
     11 #include "printing/metafile.h"
     12 #include "printing/metafile_impl.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/web/WebLocalFrame.h"
     18 
     19 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
     20 #include "base/process/process_handle.h"
     21 #else
     22 #include "base/file_descriptor_posix.h"
     23 #endif  // !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
     24 
     25 namespace printing {
     26 
     27 using blink::WebFrame;
     28 
     29 bool PrintWebViewHelper::RenderPreviewPage(
     30     int page_number,
     31     const PrintMsg_Print_Params& print_params) {
     32   PrintMsg_PrintPage_Params page_params;
     33   page_params.params = print_params;
     34   page_params.page_number = page_number;
     35   scoped_ptr<Metafile> draft_metafile;
     36   Metafile* initial_render_metafile = print_preview_context_.metafile();
     37   if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
     38     draft_metafile.reset(new PreviewMetafile);
     39     initial_render_metafile = draft_metafile.get();
     40   }
     41 
     42   base::TimeTicks begin_time = base::TimeTicks::Now();
     43   PrintPageInternal(page_params,
     44                     print_preview_context_.GetPrintCanvasSize(),
     45                     print_preview_context_.prepared_frame(),
     46                     initial_render_metafile);
     47   print_preview_context_.RenderedPreviewPage(
     48       base::TimeTicks::Now() - begin_time);
     49   if (draft_metafile.get()) {
     50     draft_metafile->FinishDocument();
     51   } else if (print_preview_context_.IsModifiable() &&
     52              print_preview_context_.generate_draft_pages()) {
     53     DCHECK(!draft_metafile.get());
     54     draft_metafile.reset(
     55         print_preview_context_.metafile()->GetMetafileForCurrentPage());
     56   }
     57   return PreviewPageRendered(page_number, draft_metafile.get());
     58 }
     59 
     60 bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
     61                                           int page_count,
     62                                           const gfx::Size& canvas_size) {
     63   NativeMetafile metafile;
     64   if (!metafile.Init())
     65     return false;
     66 
     67   const PrintMsg_PrintPages_Params& params = *print_pages_params_;
     68   std::vector<int> printed_pages;
     69 
     70   if (params.pages.empty()) {
     71     for (int i = 0; i < page_count; ++i) {
     72       printed_pages.push_back(i);
     73     }
     74   } else {
     75     // TODO(vitalybuka): redesign to make more code cross platform.
     76     for (size_t i = 0; i < params.pages.size(); ++i) {
     77       if (params.pages[i] >= 0 && params.pages[i] < page_count) {
     78         printed_pages.push_back(params.pages[i]);
     79       }
     80     }
     81   }
     82 
     83   if (printed_pages.empty())
     84     return false;
     85 
     86   PrintMsg_PrintPage_Params page_params;
     87   page_params.params = params.params;
     88   for (size_t i = 0; i < printed_pages.size(); ++i) {
     89     page_params.page_number = printed_pages[i];
     90     PrintPageInternal(page_params, canvas_size, frame, &metafile);
     91   }
     92 
     93   // blink::printEnd() for PDF should be called before metafile is closed.
     94   FinishFramePrinting();
     95 
     96   metafile.FinishDocument();
     97 
     98   // Get the size of the resulting metafile.
     99   uint32 buf_size = metafile.GetDataSize();
    100   DCHECK_GT(buf_size, 0u);
    101 
    102 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
    103   int sequence_number = -1;
    104   base::FileDescriptor fd;
    105 
    106   // Ask the browser to open a file for us.
    107   Send(new PrintHostMsg_AllocateTempFileForPrinting(routing_id(),
    108                                                     &fd,
    109                                                     &sequence_number));
    110   if (!metafile.SaveToFD(fd))
    111     return false;
    112 
    113   // Tell the browser we've finished writing the file.
    114   Send(new PrintHostMsg_TempFileForPrintingWritten(routing_id(),
    115                                                    sequence_number));
    116   return true;
    117 #else
    118   PrintHostMsg_DidPrintPage_Params printed_page_params;
    119   printed_page_params.data_size = 0;
    120   printed_page_params.document_cookie = params.params.document_cookie;
    121 
    122   {
    123     scoped_ptr<base::SharedMemory> shared_mem(
    124         content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(
    125             buf_size).release());
    126     if (!shared_mem.get()) {
    127       NOTREACHED() << "AllocateSharedMemoryBuffer failed";
    128       return false;
    129     }
    130 
    131     if (!shared_mem->Map(buf_size)) {
    132       NOTREACHED() << "Map failed";
    133       return false;
    134     }
    135     metafile.GetData(shared_mem->memory(), buf_size);
    136     printed_page_params.data_size = buf_size;
    137     shared_mem->GiveToProcess(base::GetCurrentProcessHandle(),
    138                               &(printed_page_params.metafile_data_handle));
    139   }
    140 
    141   for (size_t i = 0; i < printed_pages.size(); ++i) {
    142     printed_page_params.page_number = printed_pages[i];
    143     Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
    144     // Send the rest of the pages with an invalid metafile handle.
    145     printed_page_params.metafile_data_handle.fd = -1;
    146   }
    147   return true;
    148 #endif  // defined(OS_CHROMEOS)
    149 }
    150 
    151 void PrintWebViewHelper::PrintPageInternal(
    152     const PrintMsg_PrintPage_Params& params,
    153     const gfx::Size& canvas_size,
    154     WebFrame* frame,
    155     Metafile* metafile) {
    156   PageSizeMargins page_layout_in_points;
    157   double scale_factor = 1.0f;
    158   ComputePageLayoutInPointsForCss(frame, params.page_number, params.params,
    159                                   ignore_css_margins_, &scale_factor,
    160                                   &page_layout_in_points);
    161   gfx::Size page_size;
    162   gfx::Rect content_area;
    163   GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, &page_size,
    164                                           &content_area);
    165   gfx::Rect canvas_area =
    166       params.params.display_header_footer ? gfx::Rect(page_size) : content_area;
    167 
    168   SkBaseDevice* device = metafile->StartPageForVectorCanvas(page_size,
    169                                                             canvas_area,
    170                                                             scale_factor);
    171   if (!device)
    172     return;
    173 
    174   // The printPage method take a reference to the canvas we pass down, so it
    175   // can't be a stack object.
    176   skia::RefPtr<skia::VectorCanvas> canvas =
    177       skia::AdoptRef(new skia::VectorCanvas(device));
    178   MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
    179   skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
    180 
    181   if (params.params.display_header_footer) {
    182     // |page_number| is 0-based, so 1 is added.
    183     // TODO(vitalybuka) : why does it work only with 1.25?
    184     PrintHeaderAndFooter(canvas.get(), params.page_number + 1,
    185                          print_preview_context_.total_page_count(),
    186                          scale_factor / 1.25,
    187                          page_layout_in_points, *header_footer_info_,
    188                          params.params);
    189   }
    190   RenderPageContent(frame, params.page_number, canvas_area, content_area,
    191                     scale_factor, canvas.get());
    192 
    193   // Done printing. Close the device context to retrieve the compiled metafile.
    194   if (!metafile->FinishPage())
    195     NOTREACHED() << "metafile failed";
    196 }
    197 
    198 }  // namespace printing
    199