зеркало из https://github.com/mozilla/gecko-dev.git
64 строки
1.8 KiB
C++
64 строки
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef PDFVIAEMFPRINTHELPER_H_
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#define PDFVIAEMFPRINTHELPER_H_
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#include "nsCOMPtr.h"
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#include "PDFiumEngineShim.h"
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#include "mozilla/Vector.h"
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/* include windows.h for the HDC definitions that we need. */
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#include <windows.h>
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class nsIFile;
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class nsFileInputStream;
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namespace mozilla {
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namespace widget {
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/**
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* This class helps draw a PDF file to a given Windows DC.
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* To do that it first converts the PDF file to EMF.
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* Windows EMF:
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* https://msdn.microsoft.com/en-us/windows/hardware/drivers/print/emf-data-type
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*/
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class PDFViaEMFPrintHelper
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{
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public:
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PDFViaEMFPrintHelper();
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~PDFViaEMFPrintHelper();
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/** Loads the specified PDF file. */
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NS_IMETHOD OpenDocument(nsIFile *aFile);
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/** Releases document buffer. */
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void CloseDocument();
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int GetPageCount() { return mPDFiumEngine->GetPageCount(mPDFDoc); }
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/** Convert specified PDF page to EMF and draw the EMF onto the given DC. */
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bool DrawPage(HDC aPrinterDC, unsigned int aPageIndex,
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int aPageWidth, int aPageHeight);
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/** Convert specified PDF page to EMF and save it to file. */
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bool DrawPageToFile(const wchar_t* aFilePath, unsigned int aPageIndex,
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int aPageWidth, int aPageHeight);
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private:
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bool LoadPDFDataToBuffer(nsIFile *aFile);
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bool RenderPageToDC(HDC aDC, unsigned int aPageIndex,
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int aPageWidth, int aPageHeight);
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RefPtr<PDFiumEngineShim> mPDFiumEngine;
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FPDF_DOCUMENT mPDFDoc;
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};
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} // namespace widget
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} // namespace mozilla
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#endif /* PDFVIAEMFPRINTHELPER_H_ */ |