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       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : /* Helper class to help with generating anonymous path elements for
       8             :    <animateMotion> elements to use. */
       9             : 
      10             : #ifndef MOZILLA_SVGMOTIONSMILPATHUTILS_H_
      11             : #define MOZILLA_SVGMOTIONSMILPATHUTILS_H_
      12             : 
      13             : #include "mozilla/Attributes.h"
      14             : #include "gfxPlatform.h"
      15             : #include "mozilla/gfx/2D.h"
      16             : #include "mozilla/RefPtr.h"
      17             : #include "nsDebug.h"
      18             : #include "nsSMILParserUtils.h"
      19             : #include "nsTArray.h"
      20             : 
      21             : class nsAString;
      22             : class nsSVGElement;
      23             : 
      24             : namespace mozilla {
      25             : 
      26             : class SVGMotionSMILPathUtils
      27             : {
      28             :   typedef mozilla::gfx::DrawTarget DrawTarget;
      29             :   typedef mozilla::gfx::Path Path;
      30             :   typedef mozilla::gfx::PathBuilder PathBuilder;
      31             : 
      32             : public:
      33             :   // Class to assist in generating a Path, based on
      34             :   // coordinates in the <animateMotion> from/by/to/values attributes.
      35           0 :   class PathGenerator {
      36             :   public:
      37           0 :     explicit PathGenerator(const nsSVGElement* aSVGElement)
      38           0 :       : mSVGElement(aSVGElement),
      39           0 :         mHaveReceivedCommands(false)
      40             :     {
      41             :       RefPtr<DrawTarget> drawTarget =
      42           0 :         gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
      43           0 :       NS_ASSERTION(gfxPlatform::GetPlatform()->
      44             :                      SupportsAzureContentForDrawTarget(drawTarget),
      45             :                    "Should support Moz2D content drawing");
      46             : 
      47           0 :       mPathBuilder = drawTarget->CreatePathBuilder();
      48           0 :     }
      49             : 
      50             :     // Methods for adding various path commands to output path.
      51             :     // Note: aCoordPairStr is expected to be a whitespace and/or
      52             :     // comma-separated x,y coordinate-pair -- see description of
      53             :     // "the specified values for from, by, to, and values" at
      54             :     //    http://www.w3.org/TR/SVG11/animate.html#AnimateMotionElement
      55             :     void   MoveToOrigin();
      56             :     bool MoveToAbsolute(const nsAString& aCoordPairStr);
      57             :     bool LineToAbsolute(const nsAString& aCoordPairStr,
      58             :                           double& aSegmentDistance);
      59             :     bool LineToRelative(const nsAString& aCoordPairStr,
      60             :                           double& aSegmentDistance);
      61             : 
      62             :     // Accessor to let clients check if we've received any commands yet.
      63           0 :     inline bool HaveReceivedCommands() { return mHaveReceivedCommands; }
      64             :     // Accessor to get the finalized path
      65             :     already_AddRefed<Path> GetResultingPath();
      66             : 
      67             :   protected:
      68             :     // Helper methods
      69             :     bool ParseCoordinatePair(const nsAString& aStr,
      70             :                                float& aXVal, float& aYVal);
      71             : 
      72             :     // Member data
      73             :     const nsSVGElement* mSVGElement; // context for converting to user units
      74             :     RefPtr<PathBuilder> mPathBuilder;
      75             :     bool          mHaveReceivedCommands;
      76             :   };
      77             : 
      78             :   // Class to assist in passing each subcomponent of a |values| attribute to
      79             :   // a PathGenerator, for generating a corresponding Path.
      80             :   class MOZ_STACK_CLASS MotionValueParser :
      81             :     public nsSMILParserUtils::GenericValueParser
      82             :   {
      83             :   public:
      84           0 :     MotionValueParser(PathGenerator* aPathGenerator,
      85             :                       FallibleTArray<double>* aPointDistances)
      86           0 :       : mPathGenerator(aPathGenerator),
      87             :         mPointDistances(aPointDistances),
      88           0 :         mDistanceSoFar(0.0)
      89             :     {
      90           0 :       MOZ_ASSERT(mPointDistances->IsEmpty(),
      91             :                  "expecting point distances array to start empty");
      92           0 :     }
      93             : 
      94             :     // nsSMILParserUtils::GenericValueParser interface
      95             :     virtual bool Parse(const nsAString& aValueStr) override;
      96             : 
      97             :   protected:
      98             :     PathGenerator*          mPathGenerator;
      99             :     FallibleTArray<double>* mPointDistances;
     100             :     double                  mDistanceSoFar;
     101             :   };
     102             : 
     103             : };
     104             : 
     105             : } // namespace mozilla
     106             : 
     107             : #endif // MOZILLA_SVGMOTIONSMILPATHUTILS_H_