PrintTargetSkPDF.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef MOZILLA_GFX_PRINTTARGETSKPDF_H

#define MOZILLA_GFX_PRINTTARGETSKPDF_H

#include "mozilla/UniquePtr.h"

#include "nsCOMPtr.h"

#include "PrintTarget.h"

#include "skia/include/core/SkCanvas.h"

#include "skia/include/docs/SkPDFDocument.h"

#include "skia/include/core/SkStream.h"

namespace mozilla {

namespace gfx {

/**

 * Skia PDF printing target.

*/

class PrintTargetSkPDF final : public PrintTarget {

 public:

  // The returned PrintTargetSkPDF keeps a raw pointer to the passed SkWStream

  // but does not own it.  Callers are responsible for ensuring that passed

  // stream outlives the returned PrintTarget.

  static already_AddRefed<PrintTargetSkPDF> CreateOrNull(

      UniquePtr<SkWStream> aStream, const IntSize& aSizeInPoints);

  nsresult BeginPrinting(const nsAString& aTitle,

                         const nsAString& aPrintToFileName, int32_t aStartPage,

                         int32_t aEndPage) override;

  nsresult EndPrinting() override;

  void Finish() override;

  nsresult BeginPage(const IntSize& aSizeInPoints) override;

  nsresult EndPage() override;

  already_AddRefed<DrawTarget> MakeDrawTarget(

      const IntSize& aSize, DrawEventRecorder* aRecorder = nullptr) final;

  already_AddRefed<DrawTarget> GetReferenceDrawTarget() final;

 private:

  PrintTargetSkPDF(const IntSize& aSize, UniquePtr<SkWStream> aStream);

  virtual ~PrintTargetSkPDF();

  // Do not hand out references to this object.  It holds a non-owning

  // reference to mOStreame, so must not outlive mOStream.

  sk_sp<SkDocument> mPDFDoc;

  // The stream that the SkDocument outputs to.

  UniquePtr<SkWStream> mOStream;

  // The current page's SkCanvas and its wrapping DrawTarget:

  // Canvas is owned by mPDFDoc, which handles its deletion.

  SkCanvas* mPageCanvas;

  RefPtr<DrawTarget> mPageDT;

  // Members needed to provide a reference DrawTarget:

  sk_sp<SkDocument> mRefPDFDoc;

  // Canvas owned by mRefPDFDoc, which handles its deletion.

  SkCanvas* mRefCanvas;

  SkDynamicMemoryWStream mRefOStream;

};

}  // namespace gfx

}  // namespace mozilla

#endif /* MOZILLA_GFX_PRINTTARGETSKPDF_H */