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-rw-r--r--dom/svg/SVGMotionSMILPathUtils.h107
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diff --git a/dom/svg/SVGMotionSMILPathUtils.h b/dom/svg/SVGMotionSMILPathUtils.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Helper class to help with generating anonymous path elements for
+ <animateMotion> elements to use. */
+
+#ifndef MOZILLA_SVGMOTIONSMILPATHUTILS_H_
+#define MOZILLA_SVGMOTIONSMILPATHUTILS_H_
+
+#include "mozilla/Attributes.h"
+#include "gfxPlatform.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/RefPtr.h"
+#include "nsDebug.h"
+#include "nsSMILParserUtils.h"
+#include "nsTArray.h"
+
+class nsAString;
+class nsSVGElement;
+
+namespace mozilla {
+
+class SVGMotionSMILPathUtils
+{
+ typedef mozilla::gfx::DrawTarget DrawTarget;
+ typedef mozilla::gfx::Path Path;
+ typedef mozilla::gfx::PathBuilder PathBuilder;
+
+public:
+ // Class to assist in generating a Path, based on
+ // coordinates in the <animateMotion> from/by/to/values attributes.
+ class PathGenerator {
+ public:
+ explicit PathGenerator(const nsSVGElement* aSVGElement)
+ : mSVGElement(aSVGElement),
+ mHaveReceivedCommands(false)
+ {
+ RefPtr<DrawTarget> drawTarget =
+ gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
+ NS_ASSERTION(gfxPlatform::GetPlatform()->
+ SupportsAzureContentForDrawTarget(drawTarget),
+ "Should support Moz2D content drawing");
+
+ mPathBuilder = drawTarget->CreatePathBuilder();
+ }
+
+ // Methods for adding various path commands to output path.
+ // Note: aCoordPairStr is expected to be a whitespace and/or
+ // comma-separated x,y coordinate-pair -- see description of
+ // "the specified values for from, by, to, and values" at
+ // http://www.w3.org/TR/SVG11/animate.html#AnimateMotionElement
+ void MoveToOrigin();
+ bool MoveToAbsolute(const nsAString& aCoordPairStr);
+ bool LineToAbsolute(const nsAString& aCoordPairStr,
+ double& aSegmentDistance);
+ bool LineToRelative(const nsAString& aCoordPairStr,
+ double& aSegmentDistance);
+
+ // Accessor to let clients check if we've received any commands yet.
+ inline bool HaveReceivedCommands() { return mHaveReceivedCommands; }
+ // Accessor to get the finalized path
+ already_AddRefed<Path> GetResultingPath();
+
+ protected:
+ // Helper methods
+ bool ParseCoordinatePair(const nsAString& aStr,
+ float& aXVal, float& aYVal);
+
+ // Member data
+ const nsSVGElement* mSVGElement; // context for converting to user units
+ RefPtr<PathBuilder> mPathBuilder;
+ bool mHaveReceivedCommands;
+ };
+
+ // Class to assist in passing each subcomponent of a |values| attribute to
+ // a PathGenerator, for generating a corresponding Path.
+ class MOZ_STACK_CLASS MotionValueParser :
+ public nsSMILParserUtils::GenericValueParser
+ {
+ public:
+ MotionValueParser(PathGenerator* aPathGenerator,
+ FallibleTArray<double>* aPointDistances)
+ : mPathGenerator(aPathGenerator),
+ mPointDistances(aPointDistances),
+ mDistanceSoFar(0.0)
+ {
+ MOZ_ASSERT(mPointDistances->IsEmpty(),
+ "expecting point distances array to start empty");
+ }
+
+ // nsSMILParserUtils::GenericValueParser interface
+ virtual bool Parse(const nsAString& aValueStr) override;
+
+ protected:
+ PathGenerator* mPathGenerator;
+ FallibleTArray<double>* mPointDistances;
+ double mDistanceSoFar;
+ };
+
+};
+
+} // namespace mozilla
+
+#endif // MOZILLA_SVGMOTIONSMILPATHUTILS_H_