gfx/thebes/PrintTargetSkPDF.h
author Kris Maglione <maglione.k@gmail.com>
Thu, 14 Feb 2019 17:54:00 -0800
changeset 517406 7436c0f5b8b1583d20d5ea2d1d9d3b2c665bdf33
parent 505471 66eb1f485c1a3ea81372758bc92292c9428b17cd
child 527951 884f5dc55873c9345ee945cd6d5427e8ab398071
permissions -rw-r--r--
Fix botched backout (bug 1524687). r=bustage

/* -*- 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 "SkCanvas.h"
#include "SkPDFDocument.h"
#include "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);

  virtual nsresult BeginPrinting(const nsAString& aTitle,
                                 const nsAString& aPrintToFileName,
                                 int32_t aStartPage, int32_t aEndPage) override;
  virtual nsresult EndPrinting() override;
  virtual void Finish() override;

  virtual nsresult BeginPage() override;
  virtual 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 */