firefox-main/dom/svg/SVGTransform.cpp (file symbol)

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/* 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/. */
#include "SVGTransform.h"
#include "nsContentUtils.h" // for NS_ENSURE_FINITE
#include "nsError.h"
#include "nsMathUtils.h"
#include "nsTextFormatter.h"
namespace mozilla {
using namespace dom::SVGTransform_Binding;
void SVGTransform::GetValueAsString(nsAString& aValue) const {
switch (mType) {
case SVG_TRANSFORM_TRANSLATE:
// The spec say that if Y is not provided, it is assumed to be zero.
if (mMatrix._32 != 0)
nsTextFormatter::ssprintf(aValue, u"translate(%g, %g)", mMatrix._31,
mMatrix._32);
else
nsTextFormatter::ssprintf(aValue, u"translate(%g)", mMatrix._31);
break;
case SVG_TRANSFORM_ROTATE:
if (mOrigin != gfx::Point())
nsTextFormatter::ssprintf(aValue, u"rotate(%g, %g, %g)", mAngle,
mOrigin.x, mOrigin.y);
else
nsTextFormatter::ssprintf(aValue, u"rotate(%g)", mAngle);
break;
case SVG_TRANSFORM_SCALE:
if (mMatrix._11 != mMatrix._22)
nsTextFormatter::ssprintf(aValue, u"scale(%g, %g)", mMatrix._11,
mMatrix._22);
else
nsTextFormatter::ssprintf(aValue, u"scale(%g)", mMatrix._11);
break;
case SVG_TRANSFORM_SKEWX:
nsTextFormatter::ssprintf(aValue, u"skewX(%g)", mAngle);
break;
case SVG_TRANSFORM_SKEWY:
nsTextFormatter::ssprintf(aValue, u"skewY(%g)", mAngle);
break;
case SVG_TRANSFORM_MATRIX:
nsTextFormatter::ssprintf(aValue, u"matrix(%g, %g, %g, %g, %g, %g)",
mMatrix._11, mMatrix._12, mMatrix._21,
mMatrix._22, mMatrix._31, mMatrix._32);
break;
default:
aValue.Truncate();
NS_ERROR("unknown transformation type");
break;
}
}
void SVGTransform::SetMatrix(const gfxMatrix& aMatrix) {
mType = SVG_TRANSFORM_MATRIX;
mMatrix = aMatrix;
// We set the other members here too, since operator== requires it and
// the DOM requires it for mAngle.
mAngle = 0.f;
mOrigin = gfx::Point();
}
void SVGTransform::SetTranslate(float aTx, float aTy) {
mType = SVG_TRANSFORM_TRANSLATE;
mMatrix = gfxMatrix::Translation(aTx, aTy);
mAngle = 0.f;
mOrigin = gfx::Point();
}
void SVGTransform::SetScale(float aSx, float aSy) {
mType = SVG_TRANSFORM_SCALE;
mMatrix = gfxMatrix::Scaling(aSx, aSy);
mAngle = 0.f;
mOrigin = gfx::Point();
}
void SVGTransform::SetRotate(float aAngle, float aCx, float aCy) {
mType = SVG_TRANSFORM_ROTATE;
mMatrix = gfxMatrix::Translation(aCx, aCy)
.PreRotate(aAngle * kRadPerDegree)
.PreTranslate(-aCx, -aCy);
mAngle = aAngle;
mOrigin.MoveTo(aCx, aCy);
}
nsresult SVGTransform::SetSkewX(float aAngle) {
double ta = tan(aAngle * kRadPerDegree);
// No one actually cares about the exact error return type here.
NS_ENSURE_FINITE(ta, NS_ERROR_INVALID_ARG);
mType = SVG_TRANSFORM_SKEWX;
mMatrix = gfxMatrix();
mMatrix._21 = ta;
mAngle = aAngle;
mOrigin = gfx::Point();
return NS_OK;
}
nsresult SVGTransform::SetSkewY(float aAngle) {
double ta = tan(aAngle * kRadPerDegree);
// No one actually cares about the exact error return type here.
NS_ENSURE_FINITE(ta, NS_ERROR_INVALID_ARG);
mType = SVG_TRANSFORM_SKEWY;
mMatrix = gfxMatrix();
mMatrix._12 = ta;
mAngle = aAngle;
mOrigin = gfx::Point();
return NS_OK;
}
uint16_t SVGTransform::GetTransformTypeForString(
const nsAString& aTransformType) {
if (aTransformType.EqualsLiteral("translate")) {
return SVG_TRANSFORM_TRANSLATE;
}
if (aTransformType.EqualsLiteral("scale")) {
return SVG_TRANSFORM_SCALE;
}
if (aTransformType.EqualsLiteral("rotate")) {
return SVG_TRANSFORM_ROTATE;
}
if (aTransformType.EqualsLiteral("skewX")) {
return SVG_TRANSFORM_SKEWX;
}
if (aTransformType.EqualsLiteral("skewY")) {
return SVG_TRANSFORM_SKEWY;
}
if (aTransformType.EqualsLiteral("matrix")) {
return SVG_TRANSFORM_MATRIX;
}
return SVG_TRANSFORM_UNKNOWN;
}
SVGTransformSMILData::SVGTransformSMILData(const SVGTransform& aTransform)
: mTransformType(aTransform.Type()) {
MOZ_ASSERT(mTransformType >= SVG_TRANSFORM_MATRIX &&
mTransformType <= SVG_TRANSFORM_SKEWY,
"Unexpected transform type");
mParams.fill(0.f);
switch (mTransformType) {
case SVG_TRANSFORM_MATRIX: {
const gfxMatrix& mx = aTransform.GetMatrix();
mParams[0] = static_cast<float>(mx._11);
mParams[1] = static_cast<float>(mx._12);
mParams[2] = static_cast<float>(mx._21);
mParams[3] = static_cast<float>(mx._22);
mParams[4] = static_cast<float>(mx._31);
mParams[5] = static_cast<float>(mx._32);
break;
}
case SVG_TRANSFORM_TRANSLATE: {
const gfxMatrix& mx = aTransform.GetMatrix();
mParams[0] = static_cast<float>(mx._31);
mParams[1] = static_cast<float>(mx._32);
break;
}
case SVG_TRANSFORM_SCALE: {
const gfxMatrix& mx = aTransform.GetMatrix();
mParams[0] = static_cast<float>(mx._11);
mParams[1] = static_cast<float>(mx._22);
break;
}
case SVG_TRANSFORM_ROTATE:
mParams[0] = aTransform.Angle();
aTransform.GetRotationOrigin(mParams[1], mParams[2]);
break;
case SVG_TRANSFORM_SKEWX:
case SVG_TRANSFORM_SKEWY:
mParams[0] = aTransform.Angle();
break;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected transform type");
break;
}
}
SVGTransform SVGTransformSMILData::ToSVGTransform() const {
SVGTransform result;
switch (mTransformType) {
case SVG_TRANSFORM_MATRIX:
result.SetMatrix(gfxMatrix(mParams[0], mParams[1], mParams[2], mParams[3],
mParams[4], mParams[5]));
break;
case SVG_TRANSFORM_TRANSLATE:
result.SetTranslate(mParams[0], mParams[1]);
break;
case SVG_TRANSFORM_SCALE:
result.SetScale(mParams[0], mParams[1]);
break;
case SVG_TRANSFORM_ROTATE:
result.SetRotate(mParams[0], mParams[1], mParams[2]);
break;
case SVG_TRANSFORM_SKEWX:
result.SetSkewX(mParams[0]);
break;
case SVG_TRANSFORM_SKEWY:
result.SetSkewY(mParams[0]);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected transform type");
break;
}
return result;
}
nsresult SVGTransformSMILData::Distance(const SVGTransformSMILData& aOther,
double& aDistance) const {
NS_ASSERTION(mTransformType == aOther.mTransformType,
"Incompatible transform types to calculate distance between");
switch (mTransformType) {
// We adopt the SVGT1.2 notions of distance here
// (As discussed in bug #469040)
case SVG_TRANSFORM_TRANSLATE:
case SVG_TRANSFORM_SCALE: {
aDistance = NS_hypot(mParams[0] - aOther.mParams[0],
mParams[1] - aOther.mParams[1]);
} break;
case SVG_TRANSFORM_ROTATE:
case SVG_TRANSFORM_SKEWX:
case SVG_TRANSFORM_SKEWY: {
aDistance = std::abs(mParams[0] - aOther.mParams[0]);
} break;
default:
NS_ERROR("Got bad transform types for calculating distances");
aDistance = 1.0f;
return NS_ERROR_FAILURE;
}
return NS_OK;
}
} // namespace mozilla