gfx/thebes/PrintTargetSkPDF.h
author Cristian Tuns <ctuns@mozilla.com>
Fri, 24 Sep 2021 14:42:22 -0400
changeset 593147 0b4005ebc9776ff43d99d1427c1a1fd2e14d9a44
parent 499834 ac4ec812831a066568495ead059fc914268b0915
permissions -rw-r--r--
Backed out changeset dd075a074e45 (bug 1730518) for causing content crashes (bug 1732479). CLOSED TREE

/* -*- 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() 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 */