image/AutoRestoreSVGState.h

   1 /* -*- Mode: C++; tab-width: 2; 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_image_AutoRestoreSVGState_h
   7 #define mozilla_image_AutoRestoreSVGState_h
   8
   9 #include "mozilla/Attributes.h"
  10 #include "mozilla/AutoRestore.h"
  11 #include "mozilla/SVGContextPaint.h"
  12 #include "mozilla/dom/SVGSVGElement.h"
  13 #include "SVGDrawingParameters.h"
  14 #include "SVGDocumentWrapper.h"
  15
  16 namespace mozilla {
  17 namespace image {
  18
  19 class MOZ_STACK_CLASS AutoRestoreSVGState final {
  20  public:
  21   AutoRestoreSVGState(const SVGDrawingParameters& aParams,
  22                       SVGDocumentWrapper* aSVGDocumentWrapper,
  23                       bool aContextPaint)
  24       : mIsDrawing(aSVGDocumentWrapper->mIsDrawing)
  25         // Apply any 'preserveAspectRatio' override (if specified) to the root
  26         // element:
  27         ,
  28         mPAR(aParams.svgContext, aSVGDocumentWrapper->GetRootSVGElem())
  29         // Set the animation time:
  30         ,
  31         mTime(aSVGDocumentWrapper->GetRootSVGElem(), aParams.animationTime) {
  32     MOZ_ASSERT(!mIsDrawing.SavedValue());
  33     MOZ_ASSERT(aSVGDocumentWrapper->GetDocument());
  34
  35     aSVGDocumentWrapper->mIsDrawing = true;
  36
  37     // Set context paint (if specified) on the document:
  38     if (aContextPaint) {
  39       MOZ_ASSERT(aParams.svgContext->GetContextPaint());
  40       mContextPaint.emplace(*aParams.svgContext->GetContextPaint(),
  41                             *aSVGDocumentWrapper->GetDocument());
  42     }
  43   }
  44
  45  private:
  46   AutoRestore<bool> mIsDrawing;
  47   AutoPreserveAspectRatioOverride mPAR;
  48   AutoSVGTimeSetRestore mTime;
  49   Maybe<AutoSetRestoreSVGContextPaint> mContextPaint;
  50 };
  51
  52 }  // namespace image
  53 }  // namespace mozilla
  54
  55 #endif  // mozilla_image_AutoRestoreSVGState_h