gfx/thebes/PrintTargetSkPDF.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef MOZILLA_GFX_PRINTTARGETSKPDF_H
   7 #define MOZILLA_GFX_PRINTTARGETSKPDF_H
   8
   9 #include "mozilla/UniquePtr.h"
  10 #include "nsCOMPtr.h"
  11 #include "PrintTarget.h"
  12 #include "skia/include/core/SkCanvas.h"
  13 #include "skia/include/docs/SkPDFDocument.h"
  14 #include "skia/include/core/SkStream.h"
  15
  16 namespace mozilla {
  17 namespace gfx {
  18
  19 /**
  20  * Skia PDF printing target.
  21  */
  22 class PrintTargetSkPDF final : public PrintTarget {
  23  public:
  24   // The returned PrintTargetSkPDF keeps a raw pointer to the passed SkWStream
  25   // but does not own it.  Callers are responsible for ensuring that passed
  26   // stream outlives the returned PrintTarget.
  27   static already_AddRefed<PrintTargetSkPDF> CreateOrNull(
  28       UniquePtr<SkWStream> aStream, const IntSize& aSizeInPoints);
  29
  30   nsresult BeginPrinting(const nsAString& aTitle,
  31                          const nsAString& aPrintToFileName, int32_t aStartPage,
  32                          int32_t aEndPage) override;
  33   nsresult EndPrinting() override;
  34   void Finish() override;
  35
  36   nsresult BeginPage(const IntSize& aSizeInPoints) override;
  37   nsresult EndPage() override;
  38
  39   already_AddRefed<DrawTarget> MakeDrawTarget(
  40       const IntSize& aSize, DrawEventRecorder* aRecorder = nullptr) final;
  41
  42   already_AddRefed<DrawTarget> GetReferenceDrawTarget() final;
  43
  44  private:
  45   PrintTargetSkPDF(const IntSize& aSize, UniquePtr<SkWStream> aStream);
  46   virtual ~PrintTargetSkPDF();
  47
  48   // Do not hand out references to this object.  It holds a non-owning
  49   // reference to mOStreame, so must not outlive mOStream.
  50   sk_sp<SkDocument> mPDFDoc;
  51
  52   // The stream that the SkDocument outputs to.
  53   UniquePtr<SkWStream> mOStream;
  54
  55   // The current page's SkCanvas and its wrapping DrawTarget:
  56   // Canvas is owned by mPDFDoc, which handles its deletion.
  57   SkCanvas* mPageCanvas;
  58   RefPtr<DrawTarget> mPageDT;
  59
  60   // Members needed to provide a reference DrawTarget:
  61   sk_sp<SkDocument> mRefPDFDoc;
  62   // Canvas owned by mRefPDFDoc, which handles its deletion.
  63   SkCanvas* mRefCanvas;
  64   SkDynamicMemoryWStream mRefOStream;
  65 };
  66
  67 }  // namespace gfx
  68 }  // namespace mozilla
  69
  70 #endif /* MOZILLA_GFX_PRINTTARGETSKPDF_H */