android_webview/renderer/print_web_view_helper_linux.cc

   1 // Copyright 2013 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 // TODO(sgurun) copied from chrome/renderer. Remove after crbug.com/322276
   6
   7 #include "android_webview/renderer/print_web_view_helper.h"
   8
   9 #include "android_webview/common/print_messages.h"
  10 #include "base/logging.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "content/public/renderer/render_thread.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/web/WebLocalFrame.h"
  20
  21 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
  22 #include "base/process/process_handle.h"
  23 #else
  24 #include "base/file_descriptor_posix.h"
  25 #endif  // !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
  26
  27 namespace printing {
  28
  29 using blink::WebFrame;
  30
  31 bool PrintWebViewHelper::RenderPreviewPage(
  32     int page_number,
  33     const PrintMsg_Print_Params& print_params) {
  34   PrintMsg_PrintPage_Params page_params;
  35   page_params.params = print_params;
  36   page_params.page_number = page_number;
  37   scoped_ptr<Metafile> draft_metafile;
  38   Metafile* initial_render_metafile = print_preview_context_.metafile();
  39   if (print_preview_context_.IsModifiable() && is_print_ready_metafile_sent_) {
  40     draft_metafile.reset(new PreviewMetafile);
  41     initial_render_metafile = draft_metafile.get();
  42   }
  43
  44   base::TimeTicks begin_time = base::TimeTicks::Now();
  45   PrintPageInternal(page_params,
  46                     print_preview_context_.GetPrintCanvasSize(),
  47                     print_preview_context_.prepared_frame(),
  48                     initial_render_metafile);
  49   print_preview_context_.RenderedPreviewPage(
  50       base::TimeTicks::Now() - begin_time);
  51   if (draft_metafile.get()) {
  52     draft_metafile->FinishDocument();
  53   } else if (print_preview_context_.IsModifiable() &&
  54              print_preview_context_.generate_draft_pages()) {
  55     DCHECK(!draft_metafile.get());
  56     draft_metafile.reset(
  57         print_preview_context_.metafile()->GetMetafileForCurrentPage());
  58   }
  59   return PreviewPageRendered(page_number, draft_metafile.get());
  60 }
  61
  62 bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
  63                                           int page_count,
  64                                           const gfx::Size& canvas_size) {
  65   NativeMetafile metafile;
  66   if (!metafile.Init())
  67     return false;
  68
  69   const PrintMsg_PrintPages_Params& params = *print_pages_params_;
  70   std::vector<int> printed_pages;
  71
  72   if (params.pages.empty()) {
  73     for (int i = 0; i < page_count; ++i) {
  74       printed_pages.push_back(i);
  75     }
  76   } else {
  77     // TODO(vitalybuka): redesign to make more code cross platform.
  78     for (size_t i = 0; i < params.pages.size(); ++i) {
  79       if (params.pages[i] >= 0 && params.pages[i] < page_count) {
  80         printed_pages.push_back(params.pages[i]);
  81       }
  82     }
  83   }
  84
  85   if (printed_pages.empty())
  86     return false;
  87
  88   PrintMsg_PrintPage_Params page_params;
  89   page_params.params = params.params;
  90   for (size_t i = 0; i < printed_pages.size(); ++i) {
  91     page_params.page_number = printed_pages[i];
  92     PrintPageInternal(page_params, canvas_size, frame, &metafile);
  93   }
  94
  95   // blink::printEnd() for PDF should be called before metafile is closed.
  96   FinishFramePrinting();
  97
  98   metafile.FinishDocument();
  99
 100   // Get the size of the resulting metafile.
 101   uint32 buf_size = metafile.GetDataSize();
 102   DCHECK_GT(buf_size, 0u);
 103
 104 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 105   int sequence_number = -1;
 106   base::FileDescriptor fd;
 107
 108   // Ask the browser to open a file for us.
 109   Send(new PrintHostMsg_AllocateTempFileForPrinting(routing_id(),
 110                                                     &fd,
 111                                                     &sequence_number));
 112   if (!metafile.SaveToFD(fd))
 113     return false;
 114
 115   // Tell the browser we've finished writing the file.
 116   Send(new PrintHostMsg_TempFileForPrintingWritten(routing_id(),
 117                                                    sequence_number));
 118   return true;
 119 #else
 120   PrintHostMsg_DidPrintPage_Params printed_page_params;
 121   printed_page_params.data_size = 0;
 122   printed_page_params.document_cookie = params.params.document_cookie;
 123
 124   {
 125     scoped_ptr<base::SharedMemory> shared_mem(
 126         content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(
 127             buf_size).release());
 128     if (!shared_mem.get()) {
 129       NOTREACHED() << "AllocateSharedMemoryBuffer failed";
 130       return false;
 131     }
 132
 133     if (!shared_mem->Map(buf_size)) {
 134       NOTREACHED() << "Map failed";
 135       return false;
 136     }
 137     metafile.GetData(shared_mem->memory(), buf_size);
 138     printed_page_params.data_size = buf_size;
 139     shared_mem->GiveToProcess(base::GetCurrentProcessHandle(),
 140                               &(printed_page_params.metafile_data_handle));
 141   }
 142
 143   for (size_t i = 0; i < printed_pages.size(); ++i) {
 144     printed_page_params.page_number = printed_pages[i];
 145     Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
 146     // Send the rest of the pages with an invalid metafile handle.
 147     printed_page_params.metafile_data_handle.fd = -1;
 148   }
 149   return true;
 150 #endif  // defined(OS_CHROMEOS) || defined(OS_ANDROID)
 151 }
 152
 153 void PrintWebViewHelper::PrintPageInternal(
 154     const PrintMsg_PrintPage_Params& params,
 155     const gfx::Size& canvas_size,
 156     WebFrame* frame,
 157     Metafile* metafile) {
 158   PageSizeMargins page_layout_in_points;
 159   double scale_factor = 1.0f;
 160   ComputePageLayoutInPointsForCss(frame, params.page_number, params.params,
 161                                   ignore_css_margins_, &scale_factor,
 162                                   &page_layout_in_points);
 163   gfx::Size page_size;
 164   gfx::Rect content_area;
 165   GetPageSizeAndContentAreaFromPageLayout(page_layout_in_points, &page_size,
 166                                           &content_area);
 167   gfx::Rect canvas_area =
 168       params.params.display_header_footer ? gfx::Rect(page_size) : content_area;
 169
 170   SkBaseDevice* device = metafile->StartPageForVectorCanvas(page_size,
 171                                                             canvas_area,
 172                                                             scale_factor);
 173   if (!device)
 174     return;
 175
 176   // The printPage method take a reference to the canvas we pass down, so it
 177   // can't be a stack object.
 178   skia::RefPtr<skia::VectorCanvas> canvas =
 179       skia::AdoptRef(new skia::VectorCanvas(device));
 180   MetafileSkiaWrapper::SetMetafileOnCanvas(*canvas, metafile);
 181   skia::SetIsDraftMode(*canvas, is_print_ready_metafile_sent_);
 182
 183   if (params.params.display_header_footer) {
 184     // |page_number| is 0-based, so 1 is added.
 185     // TODO(vitalybuka) : why does it work only with 1.25?
 186     PrintHeaderAndFooter(canvas.get(), params.page_number + 1,
 187                          print_preview_context_.total_page_count(),
 188                          scale_factor / 1.25,
 189                          page_layout_in_points, *header_footer_info_,
 190                          params.params);
 191   }
 192   RenderPageContent(frame, params.page_number, canvas_area, content_area,
 193                     scale_factor, canvas.get());
 194
 195   // Done printing. Close the device context to retrieve the compiled metafile.
 196   if (!metafile->FinishPage())
 197     NOTREACHED() << "metafile failed";
 198 }
 199
 200 }  // namespace printing