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/*
Copyright (C) 2007 Eric Seidel <eric@webkit.org>
This file is part of the WebKit project
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.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGTransformDistance.h"
#include "FloatConversion.h"
#include "FloatPoint.h"
#include "FloatSize.h"
#include "SVGTransform.h"
#include <math.h>
namespace WebCore {
SVGTransformDistance::SVGTransformDistance()
: m_type(SVGTransform::SVG_TRANSFORM_UNKNOWN)
, m_angle(0)
{
}
SVGTransformDistance::SVGTransformDistance(SVGTransform::SVGTransformType type, float angle, float cx, float cy, const AffineTransform& transform)
: m_type(type)
, m_angle(angle)
, m_cx(cx)
, m_cy(cy)
, m_transform(transform)
{
}
SVGTransformDistance::SVGTransformDistance(const SVGTransform& fromSVGTransform, const SVGTransform& toSVGTransform)
: m_type(fromSVGTransform.type())
, m_angle(0)
, m_cx(0)
, m_cy(0)
{
ASSERT(m_type == toSVGTransform.type());
switch (m_type) {
case SVGTransform::SVG_TRANSFORM_UNKNOWN:
return;
case SVGTransform::SVG_TRANSFORM_MATRIX:
// FIXME: need to be able to subtract to matrices
return;
case SVGTransform::SVG_TRANSFORM_ROTATE:
{
FloatSize centerDistance = toSVGTransform.rotationCenter() - fromSVGTransform.rotationCenter();
m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
m_cx = centerDistance.width();
m_cy = centerDistance.height();
return;
}
case SVGTransform::SVG_TRANSFORM_TRANSLATE:
{
FloatSize translationDistance = toSVGTransform.translate() - fromSVGTransform.translate();
m_transform.translate(translationDistance.width(), translationDistance.height());
return;
}
case SVGTransform::SVG_TRANSFORM_SCALE:
{
float scaleX = toSVGTransform.scale().width() - fromSVGTransform.scale().width();
float scaleY = toSVGTransform.scale().height() - fromSVGTransform.scale().height();
m_transform.scale(scaleX, scaleY);
return;
}
case SVGTransform::SVG_TRANSFORM_SKEWX:
case SVGTransform::SVG_TRANSFORM_SKEWY:
m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
return;
}
}
SVGTransformDistance SVGTransformDistance::scaledDistance(float scaleFactor) const
{
switch (m_type) {
case SVGTransform::SVG_TRANSFORM_UNKNOWN:
return SVGTransformDistance();
case SVGTransform::SVG_TRANSFORM_ROTATE:
return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform());
case SVGTransform::SVG_TRANSFORM_SCALE:
case SVGTransform::SVG_TRANSFORM_MATRIX:
return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform(m_transform).scale(scaleFactor));
case SVGTransform::SVG_TRANSFORM_TRANSLATE:
{
AffineTransform newTransform(m_transform);
newTransform.setE(m_transform.e() * scaleFactor);
newTransform.setF(m_transform.f() * scaleFactor);
return SVGTransformDistance(m_type, 0, 0, 0, newTransform);
}
case SVGTransform::SVG_TRANSFORM_SKEWX:
case SVGTransform::SVG_TRANSFORM_SKEWY:
return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform());
}
ASSERT_NOT_REACHED();
return SVGTransformDistance();
}
SVGTransform SVGTransformDistance::addSVGTransforms(const SVGTransform& first, const SVGTransform& second)
{
ASSERT(first.type() == second.type());
SVGTransform transform;
switch (first.type()) {
case SVGTransform::SVG_TRANSFORM_UNKNOWN:
return SVGTransform();
case SVGTransform::SVG_TRANSFORM_ROTATE:
{
transform.setRotate(first.angle() + second.angle(), first.rotationCenter().x() + second.rotationCenter().x(),
first.rotationCenter().y() + second.rotationCenter().y());
return transform;
}
case SVGTransform::SVG_TRANSFORM_MATRIX:
transform.setMatrix(first.matrix() * second.matrix());
return transform;
case SVGTransform::SVG_TRANSFORM_TRANSLATE:
{
float dx = first.translate().x() + second.translate().x();
float dy = first.translate().y() + second.translate().y();
transform.setTranslate(dx, dy);
return transform;
}
case SVGTransform::SVG_TRANSFORM_SCALE:
{
FloatSize scale = first.scale() + second.scale();
transform.setScale(scale.width(), scale.height());
return transform;
}
case SVGTransform::SVG_TRANSFORM_SKEWX:
transform.setSkewX(first.angle() + second.angle());
return transform;
case SVGTransform::SVG_TRANSFORM_SKEWY:
transform.setSkewY(first.angle() + second.angle());
return transform;
}
ASSERT_NOT_REACHED();
return SVGTransform();
}
void SVGTransformDistance::addSVGTransform(const SVGTransform& transform, bool absoluteValue)
{
// If this is the first add, set the type for this SVGTransformDistance
if (m_type == SVGTransform::SVG_TRANSFORM_UNKNOWN)
m_type = transform.type();
ASSERT(m_type == transform.type());
switch (m_type) {
case SVGTransform::SVG_TRANSFORM_UNKNOWN:
return;
case SVGTransform::SVG_TRANSFORM_MATRIX:
m_transform *= transform.matrix(); // FIXME: what does 'distance' between two transforms mean? how should we respect 'absoluteValue' here?
return;
case SVGTransform::SVG_TRANSFORM_ROTATE:
m_angle += absoluteValue ? fabsf(transform.angle()) : transform.angle();
m_cx += absoluteValue ? fabsf(transform.rotationCenter().x()) : transform.rotationCenter().x();
m_cy += absoluteValue ? fabsf(transform.rotationCenter().y()) : transform.rotationCenter().y();
// fall through
case SVGTransform::SVG_TRANSFORM_TRANSLATE:
{
float dx = absoluteValue ? fabsf(transform.translate().x()) : transform.translate().x();
float dy = absoluteValue ? fabsf(transform.translate().y()) : transform.translate().y();
m_transform.translate(dx, dy);
return;
}
case SVGTransform::SVG_TRANSFORM_SCALE:
{
float scaleX = absoluteValue ? fabsf(transform.scale().width()) : transform.scale().width();
float scaleY = absoluteValue ? fabsf(transform.scale().height()) : transform.scale().height();
m_transform.scale(scaleX, scaleY);
return;
}
case SVGTransform::SVG_TRANSFORM_SKEWX:
case SVGTransform::SVG_TRANSFORM_SKEWY:
m_angle += absoluteValue ? fabsf(transform.angle()) : transform.angle();
return;
}
ASSERT_NOT_REACHED();
return;
}
SVGTransform SVGTransformDistance::addToSVGTransform(const SVGTransform& transform) const
{
ASSERT(m_type == transform.type() || transform == SVGTransform());
SVGTransform newTransform(transform);
switch (m_type) {
case SVGTransform::SVG_TRANSFORM_UNKNOWN:
return SVGTransform();
case SVGTransform::SVG_TRANSFORM_MATRIX:
return SVGTransform(transform.matrix() * m_transform);
case SVGTransform::SVG_TRANSFORM_TRANSLATE:
{
FloatPoint translation = transform.translate();
translation += FloatSize::narrowPrecision(m_transform.e(), m_transform.f());
newTransform.setTranslate(translation.x(), translation.y());
return newTransform;
}
case SVGTransform::SVG_TRANSFORM_SCALE:
{
FloatSize scale = transform.scale();
scale += FloatSize::narrowPrecision(m_transform.a(), m_transform.d());
newTransform.setScale(scale.width(), scale.height());
return newTransform;
}
case SVGTransform::SVG_TRANSFORM_ROTATE:
{
// FIXME: I'm not certain the translation is calculated correctly here
FloatPoint center = transform.rotationCenter();
newTransform.setRotate(transform.angle() + m_angle,
center.x() + m_cx,
center.y() + m_cy);
return newTransform;
}
case SVGTransform::SVG_TRANSFORM_SKEWX:
newTransform.setSkewX(transform.angle() + m_angle);
return newTransform;
case SVGTransform::SVG_TRANSFORM_SKEWY:
newTransform.setSkewY(transform.angle() + m_angle);
return newTransform;
}
ASSERT_NOT_REACHED();
return SVGTransform();
}
bool SVGTransformDistance::isZero() const
{
return (m_transform == AffineTransform() && m_angle == 0);
}
float SVGTransformDistance::distance() const
{
switch (m_type) {
case SVGTransform::SVG_TRANSFORM_UNKNOWN:
return 0.0f;
case SVGTransform::SVG_TRANSFORM_ROTATE:
return sqrtf(m_angle * m_angle + m_cx * m_cx + m_cy * m_cy);
case SVGTransform::SVG_TRANSFORM_MATRIX:
return 0.0f; // I'm not quite sure yet what distance between two matrices means.
case SVGTransform::SVG_TRANSFORM_SCALE:
return static_cast<float>(sqrt(m_transform.a() * m_transform.a() + m_transform.d() * m_transform.d()));
case SVGTransform::SVG_TRANSFORM_TRANSLATE:
return static_cast<float>(sqrt(m_transform.e() * m_transform.e() + m_transform.f() * m_transform.f()));
case SVGTransform::SVG_TRANSFORM_SKEWX:
case SVGTransform::SVG_TRANSFORM_SKEWY:
return m_angle;
}
ASSERT_NOT_REACHED();
return 0.0f;
}
}
#endif
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