/* -*- 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/. */
#include "SVGTransform.h"
#include "nsError.h"
#include "nsContentUtils.h" // for NS_ENSURE_FINITE
#include "nsTextFormatter.h"
namespace {
const double kRadPerDegree =
2.
0 * M_PI /
360.
0;
}
// namespace
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 (mOriginX !=
0.
0f || mOriginY !=
0.
0f)
nsTextFormatter::ssprintf(aValue, u
"rotate(%g, %g, %g)", mAngle,
mOriginX, mOriginY);
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;
mOriginX =
0.f;
mOriginY =
0.f;
}
void SVGTransform::SetTranslate(
float aTx,
float aTy) {
mType = SVG_TRANSFORM_TRANSLATE;
mMatrix = gfxMatrix::Translation(aTx, aTy);
mAngle =
0.f;
mOriginX =
0.f;
mOriginY =
0.f;
}
void SVGTransform::SetScale(
float aSx,
float aSy) {
mType = SVG_TRANSFORM_SCALE;
mMatrix = gfxMatrix::Scaling(aSx, aSy);
mAngle =
0.f;
mOriginX =
0.f;
mOriginY =
0.f;
}
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;
mOriginX = aCx;
mOriginY = 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;
mOriginX =
0.f;
mOriginY =
0.f;
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;
mOriginX =
0.f;
mOriginY =
0.f;
return NS_OK;
}
SVGTransformSMILData::SVGTransformSMILData(
const SVGTransform& aTransform)
: mTransformType(aTransform.Type()) {
MOZ_ASSERT(mTransformType >= SVG_TRANSFORM_MATRIX &&
mTransformType <= SVG_TRANSFORM_SKEWY,
"Unexpected transform type");
for (uint32_t i =
0; i < NUM_STORED_PARAMS; ++i) {
mParams[i] =
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;
}
}
// namespace mozilla
