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Diffstat (limited to 'dom/svg/nsSVGTransform.h')
| -rw-r--r-- | dom/svg/nsSVGTransform.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/dom/svg/nsSVGTransform.h b/dom/svg/nsSVGTransform.h new file mode 100644 index 000000000..be55d3e2e --- /dev/null +++ b/dom/svg/nsSVGTransform.h @@ -0,0 +1,178 @@ +/* -*- 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/. */ + +#ifndef MOZILLA_SVGTRANSFORM_H__ +#define MOZILLA_SVGTRANSFORM_H__ + +#include "gfxMatrix.h" +#include "nsDebug.h" + +namespace mozilla { + +// Transform Types +static const unsigned short SVG_TRANSFORM_UNKNOWN = 0; +static const unsigned short SVG_TRANSFORM_MATRIX = 1; +static const unsigned short SVG_TRANSFORM_TRANSLATE = 2; +static const unsigned short SVG_TRANSFORM_SCALE = 3; +static const unsigned short SVG_TRANSFORM_ROTATE = 4; +static const unsigned short SVG_TRANSFORM_SKEWX = 5; +static const unsigned short SVG_TRANSFORM_SKEWY = 6; + +/* + * The DOM wrapper class for this class is DOMSVGTransformMatrix. + */ +class nsSVGTransform +{ +public: + // Default ctor initialises to matrix type with identity matrix + nsSVGTransform() + : mMatrix() // Initialises to identity + , mAngle(0.f) + , mOriginX(0.f) + , mOriginY(0.f) + , mType(SVG_TRANSFORM_MATRIX) + { } + + explicit nsSVGTransform(const gfxMatrix& aMatrix) + : mMatrix(aMatrix) + , mAngle(0.f) + , mOriginX(0.f) + , mOriginY(0.f) + , mType(SVG_TRANSFORM_MATRIX) + { } + + bool operator==(const nsSVGTransform& rhs) const { + return mType == rhs.mType && + MatricesEqual(mMatrix, rhs.mMatrix) && + mAngle == rhs.mAngle && + mOriginX == rhs.mOriginX && + mOriginY == rhs.mOriginY; + } + + void GetValueAsString(nsAString& aValue) const; + + float Angle() const { + return mAngle; + } + void GetRotationOrigin(float& aOriginX, float& aOriginY) const { + aOriginX = mOriginX; + aOriginY = mOriginY; + } + uint16_t Type() const { + return mType; + } + + const gfxMatrix& GetMatrix() const { return mMatrix; } + void SetMatrix(const gfxMatrix& aMatrix); + void SetTranslate(float aTx, float aTy); + void SetScale(float aSx, float aSy); + void SetRotate(float aAngle, float aCx, float aCy); + nsresult SetSkewX(float aAngle); + nsresult SetSkewY(float aAngle); + + static bool MatricesEqual(const gfxMatrix& a, const gfxMatrix& b) + { + return a._11 == b._11 && + a._12 == b._12 && + a._21 == b._21 && + a._22 == b._22 && + a._31 == b._31 && + a._32 == b._32; + } + +protected: + gfxMatrix mMatrix; + float mAngle, mOriginX, mOriginY; + uint16_t mType; +}; + +/* + * A slightly more light-weight version of nsSVGTransform for SMIL animation. + * + * Storing the parameters in an array (rather than a matrix) also allows simpler + * (transform type-agnostic) interpolation and addition. + * + * The meaning of the mParams array depends on the transform type as follows: + * + * Type | mParams[0], mParams[1], mParams[2], ... + * --------------------+----------------------------------------- + * translate | tx, ty + * scale | sx, sy + * rotate | rotation-angle (in degrees), cx, cy + * skewX | skew-angle (in degrees) + * skewY | skew-angle (in degrees) + * matrix | a, b, c, d, e, f + * + * The matrix type is never generated by animation code (it is only produced + * when the user inserts one via the DOM) and often requires special handling + * when we do encounter it. Therefore many users of this class are only + * interested in the first three parameters and so we provide a special + * constructor for setting those parameters only. + */ +class SVGTransformSMILData +{ +public: + // Number of float-params required in constructor, if constructing one of the + // 'simple' transform types (all but matrix type) + static const uint32_t NUM_SIMPLE_PARAMS = 3; + + // Number of float-params required in constructor for matrix type. + // This is also the number of params we actually store, regardless of type. + static const uint32_t NUM_STORED_PARAMS = 6; + + explicit SVGTransformSMILData(uint16_t aType) + : mTransformType(aType) + { + MOZ_ASSERT(aType >= SVG_TRANSFORM_MATRIX && aType <= SVG_TRANSFORM_SKEWY, + "Unexpected transform type"); + for (uint32_t i = 0; i < NUM_STORED_PARAMS; ++i) { + mParams[i] = 0.f; + } + } + + SVGTransformSMILData(uint16_t aType, float (&aParams)[NUM_SIMPLE_PARAMS]) + : mTransformType(aType) + { + MOZ_ASSERT(aType >= SVG_TRANSFORM_TRANSLATE && aType <= SVG_TRANSFORM_SKEWY, + "Expected 'simple' transform type"); + for (uint32_t i = 0; i < NUM_SIMPLE_PARAMS; ++i) { + mParams[i] = aParams[i]; + } + for (uint32_t i = NUM_SIMPLE_PARAMS; i < NUM_STORED_PARAMS; ++i) { + mParams[i] = 0.f; + } + } + + // Conversion to/from a fully-fledged nsSVGTransform + explicit SVGTransformSMILData(const nsSVGTransform& aTransform); + nsSVGTransform ToSVGTransform() const; + + bool operator==(const SVGTransformSMILData& aOther) const + { + if (mTransformType != aOther.mTransformType) + return false; + + for (uint32_t i = 0; i < NUM_STORED_PARAMS; ++i) { + if (mParams[i] != aOther.mParams[i]) { + return false; + } + } + + return true; + } + + bool operator!=(const SVGTransformSMILData& aOther) const + { + return !(*this == aOther); + } + + uint16_t mTransformType; + float mParams[NUM_STORED_PARAMS]; +}; + +} // namespace mozilla + +#endif // MOZILLA_SVGTRANSFORM_H__ |