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107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Helper class to help with generating anonymous path elements for
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<animateMotion> elements to use. */
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#ifndef MOZILLA_SVGMOTIONSMILPATHUTILS_H_
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#define MOZILLA_SVGMOTIONSMILPATHUTILS_H_
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#include "mozilla/Attributes.h"
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#include "gfxPlatform.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.h"
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#include "nsDebug.h"
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#include "nsSMILParserUtils.h"
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#include "nsTArray.h"
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class nsAString;
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class nsSVGElement;
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namespace mozilla {
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class SVGMotionSMILPathUtils
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{
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::Path Path;
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typedef mozilla::gfx::PathBuilder PathBuilder;
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public:
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// Class to assist in generating a Path, based on
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// coordinates in the <animateMotion> from/by/to/values attributes.
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class PathGenerator {
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public:
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explicit PathGenerator(const nsSVGElement* aSVGElement)
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: mSVGElement(aSVGElement),
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mHaveReceivedCommands(false)
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{
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RefPtr<DrawTarget> drawTarget =
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gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
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NS_ASSERTION(gfxPlatform::GetPlatform()->
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SupportsAzureContentForDrawTarget(drawTarget),
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"Should support Moz2D content drawing");
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mPathBuilder = drawTarget->CreatePathBuilder();
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}
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// Methods for adding various path commands to output path.
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// Note: aCoordPairStr is expected to be a whitespace and/or
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// comma-separated x,y coordinate-pair -- see description of
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// "the specified values for from, by, to, and values" at
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// http://www.w3.org/TR/SVG11/animate.html#AnimateMotionElement
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void MoveToOrigin();
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bool MoveToAbsolute(const nsAString& aCoordPairStr);
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bool LineToAbsolute(const nsAString& aCoordPairStr,
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double& aSegmentDistance);
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bool LineToRelative(const nsAString& aCoordPairStr,
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double& aSegmentDistance);
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// Accessor to let clients check if we've received any commands yet.
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inline bool HaveReceivedCommands() { return mHaveReceivedCommands; }
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// Accessor to get the finalized path
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mozilla::TemporaryRef<Path> GetResultingPath();
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protected:
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// Helper methods
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bool ParseCoordinatePair(const nsAString& aStr,
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float& aXVal, float& aYVal);
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// Member data
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const nsSVGElement* mSVGElement; // context for converting to user units
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RefPtr<PathBuilder> mPathBuilder;
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bool mHaveReceivedCommands;
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};
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// Class to assist in passing each subcomponent of a |values| attribute to
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// a PathGenerator, for generating a corresponding Path.
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class MOZ_STACK_CLASS MotionValueParser :
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public nsSMILParserUtils::GenericValueParser
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{
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public:
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MotionValueParser(PathGenerator* aPathGenerator,
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FallibleTArray<double>* aPointDistances)
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: mPathGenerator(aPathGenerator),
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mPointDistances(aPointDistances),
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mDistanceSoFar(0.0)
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{
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MOZ_ASSERT(mPointDistances->IsEmpty(),
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"expecting point distances array to start empty");
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}
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// nsSMILParserUtils::GenericValueParser interface
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virtual bool Parse(const nsAString& aValueStr) MOZ_OVERRIDE;
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protected:
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PathGenerator* mPathGenerator;
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FallibleTArray<double>* mPointDistances;
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double mDistanceSoFar;
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};
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};
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} // namespace mozilla
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#endif // MOZILLA_SVGMOTIONSMILPATHUTILS_H_
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