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/*
* Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
* Copyright (C) 2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "FloatConversion.h"
#include "FloatPoint.h"
#include "FloatSize.h"
#include "SVGMatrix.h"
#include <wtf/HashMap.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
class FloatSize;
class SVGTransformValue {
public:
enum SVGTransformType {
SVG_TRANSFORM_UNKNOWN = 0,
SVG_TRANSFORM_MATRIX = 1,
SVG_TRANSFORM_TRANSLATE = 2,
SVG_TRANSFORM_SCALE = 3,
SVG_TRANSFORM_ROTATE = 4,
SVG_TRANSFORM_SKEWX = 5,
SVG_TRANSFORM_SKEWY = 6
};
enum ConstructionMode {
ConstructIdentityTransform,
ConstructZeroTransform
};
SVGTransformValue(SVGTransformType type = SVG_TRANSFORM_MATRIX, const AffineTransform& transform = { })
: m_type(type)
, m_matrix(SVGMatrix::create(transform))
{
}
SVGTransformValue(const SVGTransformValue& other)
: m_type(other.m_type)
, m_matrix(SVGMatrix::create(other.matrix()->value()))
, m_angle(other.m_angle)
, m_rotationCenter(other.m_rotationCenter)
{
}
SVGTransformValue(SVGTransformType type, Ref<SVGMatrix>&& matrix, float angle, const FloatPoint& rotationCenter)
: m_type(type)
, m_matrix(WTFMove(matrix))
, m_angle(angle)
, m_rotationCenter(rotationCenter)
{
}
SVGTransformValue(SVGTransformValue&& other)
: m_type(other.m_type)
, m_matrix(other.m_matrix.copyRef())
, m_angle(other.m_angle)
, m_rotationCenter(other.m_rotationCenter)
{
}
SVGTransformValue& operator=(const SVGTransformValue& other)
{
m_type = other.m_type;
m_matrix->setValue(other.m_matrix->value());
m_angle = other.m_angle;
m_rotationCenter = other.m_rotationCenter;
return *this;
}
SVGTransformType type() const { return m_type; }
const Ref<SVGMatrix>& matrix() const { return m_matrix; }
float angle() const { return m_angle; }
FloatPoint rotationCenter() const { return m_rotationCenter; }
bool isValid() const { return m_type != SVG_TRANSFORM_UNKNOWN; }
void setMatrix(const AffineTransform& matrix)
{
m_type = SVG_TRANSFORM_MATRIX;
m_angle = 0;
m_rotationCenter = FloatPoint();
m_matrix->setValue(matrix);
}
void matrixDidChange()
{
// The underlying matrix has been changed, alter the transformation type.
// Spec: In case the matrix object is changed directly (i.e., without using the methods on the SVGTransform interface itself)
// then the type of the SVGTransform changes to SVG_TRANSFORM_MATRIX.
m_type = SVG_TRANSFORM_MATRIX;
m_angle = 0;
m_rotationCenter = FloatPoint();
}
FloatPoint translate() const
{
return FloatPoint::narrowPrecision(m_matrix->e(), m_matrix->f());
}
void setTranslate(float tx, float ty)
{
m_type = SVG_TRANSFORM_TRANSLATE;
m_angle = 0;
m_rotationCenter = FloatPoint();
m_matrix->value().makeIdentity();
m_matrix->value().translate(tx, ty);
}
FloatSize scale() const
{
return FloatSize::narrowPrecision(m_matrix->a(), m_matrix->d());
}
void setScale(float sx, float sy)
{
m_type = SVG_TRANSFORM_SCALE;
m_angle = 0;
m_rotationCenter = FloatPoint();
m_matrix->value().makeIdentity();
m_matrix->value().scaleNonUniform(sx, sy);
}
void setRotate(float angle, float cx, float cy)
{
m_type = SVG_TRANSFORM_ROTATE;
m_angle = angle;
m_rotationCenter = FloatPoint(cx, cy);
// TODO: toString() implementation, which can show cx, cy (need to be stored?)
m_matrix->value().makeIdentity();
m_matrix->value().translate(cx, cy);
m_matrix->value().rotate(angle);
m_matrix->value().translate(-cx, -cy);
}
void setSkewX(float angle)
{
m_type = SVG_TRANSFORM_SKEWX;
m_angle = angle;
m_rotationCenter = FloatPoint();
m_matrix->value().makeIdentity();
m_matrix->value().skewX(angle);
}
void setSkewY(float angle)
{
m_type = SVG_TRANSFORM_SKEWY;
m_angle = angle;
m_rotationCenter = FloatPoint();
m_matrix->value().makeIdentity();
m_matrix->value().skewY(angle);
}
String valueAsString() const
{
StringBuilder builder;
builder.append(prefixForTransfromType(m_type));
switch (m_type) {
case SVG_TRANSFORM_UNKNOWN:
break;
case SVG_TRANSFORM_MATRIX:
appendMatrix(builder);
break;
case SVG_TRANSFORM_TRANSLATE:
appendTranslate(builder);
break;
case SVG_TRANSFORM_SCALE:
appendScale(builder);
break;
case SVG_TRANSFORM_ROTATE:
appendRotate(builder);
break;
case SVG_TRANSFORM_SKEWX:
appendSkewX(builder);
break;
case SVG_TRANSFORM_SKEWY:
appendSkewY(builder);
break;
}
return builder.toString();
}
static String prefixForTransfromType(SVGTransformType type)
{
switch (type) {
case SVG_TRANSFORM_UNKNOWN:
return emptyString();
case SVG_TRANSFORM_MATRIX:
return "matrix("_s;
case SVG_TRANSFORM_TRANSLATE:
return "translate("_s;
case SVG_TRANSFORM_SCALE:
return "scale("_s;
case SVG_TRANSFORM_ROTATE:
return "rotate("_s;
case SVG_TRANSFORM_SKEWX:
return "skewX("_s;
case SVG_TRANSFORM_SKEWY:
return "skewY("_s;
}
ASSERT_NOT_REACHED();
return emptyString();
}
private:
static void appendNumbers(StringBuilder& builder)
{
builder.append(')');
}
template<typename Number, typename... Numbers>
static void appendNumbers(StringBuilder& builder, Number number, Numbers... numbers)
{
if (builder.length() && builder[builder.length() - 1] != '(')
builder.append(' ');
builder.appendNumber(number);
appendNumbers(builder, numbers...);
}
void appendMatrix(StringBuilder& builder) const
{
appendNumbers(builder, m_matrix->a(), m_matrix->b(), m_matrix->c(), m_matrix->d(), m_matrix->e(), m_matrix->f());
}
void appendTranslate(StringBuilder& builder) const
{
appendNumbers(builder, m_matrix->e(), m_matrix->f());
}
void appendScale(StringBuilder& builder) const
{
appendNumbers(builder, m_matrix->value().xScale(), m_matrix->value().yScale());
}
void appendRotate(StringBuilder& builder) const
{
double angleInRad = deg2rad(m_angle);
double cosAngle = std::cos(angleInRad);
double sinAngle = std::sin(angleInRad);
float cx = narrowPrecisionToFloat(cosAngle != 1 ? (m_matrix->e() * (1 - cosAngle) - m_matrix->f() * sinAngle) / (1 - cosAngle) / 2 : 0);
float cy = narrowPrecisionToFloat(cosAngle != 1 ? (m_matrix->e() * sinAngle / (1 - cosAngle) + m_matrix->f()) / 2 : 0);
if (cx || cy)
appendNumbers(builder, m_angle, cx, cy);
else
appendNumbers(builder, m_angle);
}
void appendSkewX(StringBuilder& builder) const
{
appendNumbers(builder, m_angle);
}
void appendSkewY(StringBuilder& builder) const
{
appendNumbers(builder, m_angle);
}
SVGTransformType m_type { SVG_TRANSFORM_UNKNOWN };
Ref<SVGMatrix> m_matrix;
float m_angle { 0 };
FloatPoint m_rotationCenter;
};
} // namespace WebCore