144 lines
4.7 KiB
C++
144 lines
4.7 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "libcef/utility/printing_handler.h"
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#include "base/files/file_util.h"
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#include "base/lazy_instance.h"
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#include "base/path_service.h"
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#include "base/scoped_native_library.h"
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#include "chrome/common/chrome_paths.h"
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#include "chrome/common/chrome_utility_printing_messages.h"
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#include "content/public/utility/utility_thread.h"
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#include "printing/page_range.h"
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#include "printing/pdf_render_settings.h"
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#if defined(OS_WIN)
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#include "base/win/iat_patch_function.h"
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#include "printing/emf_win.h"
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#include "ui/gfx/gdi_util.h"
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#endif
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namespace {
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bool Send(IPC::Message* message) {
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return content::UtilityThread::Get()->Send(message);
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}
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void ReleaseProcessIfNeeded() {
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content::UtilityThread::Get()->ReleaseProcessIfNeeded();
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}
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} // namespace
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PrintingHandler::PrintingHandler() {}
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PrintingHandler::~PrintingHandler() {}
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bool PrintingHandler::OnMessageReceived(const IPC::Message& message) {
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bool handled = true;
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IPC_BEGIN_MESSAGE_MAP(PrintingHandler, message)
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#if defined(OS_WIN)
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IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles,
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OnRenderPDFPagesToMetafile)
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IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles_GetPage,
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OnRenderPDFPagesToMetafileGetPage)
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IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RenderPDFPagesToMetafiles_Stop,
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OnRenderPDFPagesToMetafileStop)
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#endif // OS_WIN
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IPC_MESSAGE_UNHANDLED(handled = false)
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IPC_END_MESSAGE_MAP()
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return handled;
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}
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#if defined(OS_WIN)
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void PrintingHandler::OnRenderPDFPagesToMetafile(
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IPC::PlatformFileForTransit pdf_transit,
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const printing::PdfRenderSettings& settings) {
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pdf_rendering_settings_ = settings;
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base::File pdf_file = IPC::PlatformFileForTransitToFile(pdf_transit);
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int page_count = LoadPDF(pdf_file.Pass());
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Send(
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new ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageCount(page_count));
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}
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void PrintingHandler::OnRenderPDFPagesToMetafileGetPage(
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int page_number,
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IPC::PlatformFileForTransit output_file) {
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base::File emf_file = IPC::PlatformFileForTransitToFile(output_file);
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double scale_factor = 1.0;
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bool success =
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RenderPdfPageToMetafile(page_number, emf_file.Pass(), &scale_factor);
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Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageDone(
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success, scale_factor));
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}
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void PrintingHandler::OnRenderPDFPagesToMetafileStop() {
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ReleaseProcessIfNeeded();
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}
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int PrintingHandler::LoadPDF(base::File pdf_file) {
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int64 length = pdf_file.GetLength();
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if (length < 0)
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return 0;
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pdf_data_.resize(length);
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if (length != pdf_file.Read(0, pdf_data_.data(), pdf_data_.size()))
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return 0;
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int total_page_count = 0;
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if (!chrome_pdf::GetPDFDocInfo(
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&pdf_data_.front(), pdf_data_.size(), &total_page_count, NULL)) {
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return 0;
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}
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return total_page_count;
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}
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bool PrintingHandler::RenderPdfPageToMetafile(int page_number,
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base::File output_file,
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double* scale_factor) {
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printing::Emf metafile;
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metafile.Init();
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// We need to scale down DC to fit an entire page into DC available area.
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// Current metafile is based on screen DC and have current screen size.
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// Writing outside of those boundaries will result in the cut-off output.
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// On metafiles (this is the case here), scaling down will still record
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// original coordinates and we'll be able to print in full resolution.
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// Before playback we'll need to counter the scaling up that will happen
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// in the service (print_system_win.cc).
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*scale_factor =
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gfx::CalculatePageScale(metafile.context(),
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pdf_rendering_settings_.area().right(),
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pdf_rendering_settings_.area().bottom());
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gfx::ScaleDC(metafile.context(), *scale_factor);
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// The underlying metafile is of type Emf and ignores the arguments passed
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// to StartPage.
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metafile.StartPage(gfx::Size(), gfx::Rect(), 1);
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if (!chrome_pdf::RenderPDFPageToDC(
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&pdf_data_.front(),
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pdf_data_.size(),
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page_number,
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metafile.context(),
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pdf_rendering_settings_.dpi(),
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pdf_rendering_settings_.area().x(),
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pdf_rendering_settings_.area().y(),
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pdf_rendering_settings_.area().width(),
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pdf_rendering_settings_.area().height(),
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true,
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false,
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true,
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true,
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pdf_rendering_settings_.autorotate())) {
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return false;
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}
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metafile.FinishPage();
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metafile.FinishDocument();
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return metafile.SaveTo(&output_file);
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}
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#endif // OS_WIN
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