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       : AutoRestoreSVGState(aParams.svgContext, aParams.animationTime,
  25                             aSVGDocumentWrapper, aContextPaint) {}
  26
  27   AutoRestoreSVGState(const Maybe<SVGImageContext>& aSVGContext,
  28                       float aAnimationTime,
  29                       SVGDocumentWrapper* aSVGDocumentWrapper,
  30                       bool aContextPaint)
  31       : mIsDrawing(aSVGDocumentWrapper->mIsDrawing)
  32         // Apply any 'preserveAspectRatio' override (if specified) to the root
  33         // element:
  34         ,
  35         mPAR(aSVGContext, aSVGDocumentWrapper->GetRootSVGElem())
  36         // Set the animation time:
  37         ,
  38         mTime(aSVGDocumentWrapper->GetRootSVGElem(), aAnimationTime) {
  39     MOZ_ASSERT(!mIsDrawing.SavedValue());
  40     MOZ_ASSERT(aSVGDocumentWrapper->GetDocument());
  41
  42     aSVGDocumentWrapper->mIsDrawing = true;
  43
  44     // Set context paint (if specified) on the document:
  45     if (aContextPaint) {
  46       MOZ_ASSERT(aSVGContext->GetContextPaint());
  47       mContextPaint.emplace(*aSVGContext->GetContextPaint(),
  48                             *aSVGDocumentWrapper->GetDocument());
  49     }
  50   }
  51
  52  private:
  53   AutoRestore<bool> mIsDrawing;
  54   AutoPreserveAspectRatioOverride mPAR;
  55   AutoSVGTimeSetRestore mTime;
  56   Maybe<AutoSetRestoreSVGContextPaint> mContextPaint;
  57 };
  58
  59 }  // namespace image
  60 }  // namespace mozilla
  61
  62 #endif  // mozilla_image_AutoRestoreSVGState_h