/*
*
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* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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#include "config.h"
#include "AffineTransform.h"
#include "IntRect.h"
#include "FloatRect.h"
#include "cairo.h"
namespace WebCore {
static const double deg2rad = 0.017453292519943295769; // pi/180
AffineTransform::AffineTransform()
{
cairo_matrix_init_identity(&m_transform);
}
AffineTransform::AffineTransform(double a, double b, double c, double d, double tx, double ty)
{
cairo_matrix_init(&m_transform, a, c, b, d, tx, ty);
}
AffineTransform::AffineTransform(const cairo_matrix_t &matrix)
{
m_transform = matrix;
}
void AffineTransform::setMatrix(double a, double b, double c, double d, double tx, double ty)
{
cairo_matrix_init(&m_transform, a, c, b, d, tx, ty);
}
void AffineTransform::map(double x, double y, double* x2, double* y2) const
{
*x2 = x;
*y2 = y;
cairo_matrix_transform_point(&m_transform, x2, y2);
}
IntRect AffineTransform::mapRect(const IntRect &rect) const
{
FloatRect floatRect(rect);
FloatRect enclosingFloatRect = this->mapRect(floatRect);
return enclosingIntRect(enclosingFloatRect);
}
FloatRect AffineTransform::mapRect(const FloatRect &rect) const
{
double rectMinX = rect.x();
double rectMaxX = rect.x() + rect.width();
double rectMinY = rect.y();
double rectMaxY = rect.y() + rect.height();
double px = rectMinX;
double py = rectMinY;
cairo_matrix_transform_point(&m_transform, &px, &py);
double enclosingRectMinX = px;
double enclosingRectMinY = py;
double enclosingRectMaxX = px;
double enclosingRectMaxY = py;
px = rectMaxX;
py = rectMinY;
cairo_matrix_transform_point(&m_transform, &px, &py);
if (px < enclosingRectMinX)
enclosingRectMinX = px;
else if (px > enclosingRectMaxX)
enclosingRectMaxX = px;
if (py < enclosingRectMinY)
enclosingRectMinY = py;
else if (py > enclosingRectMaxY)
enclosingRectMaxY = py;
px = rectMaxX;
py = rectMaxY;
cairo_matrix_transform_point(&m_transform, &px, &py);
if (px < enclosingRectMinX)
enclosingRectMinX = px;
else if (px > enclosingRectMaxX)
enclosingRectMaxX = px;
if (py < enclosingRectMinY)
enclosingRectMinY = py;
else if (py > enclosingRectMaxY)
enclosingRectMaxY = py;
px = rectMinX;
py = rectMaxY;
cairo_matrix_transform_point(&m_transform, &px, &py);
if (px < enclosingRectMinX)
enclosingRectMinX = px;
else if (px > enclosingRectMaxX)
enclosingRectMaxX = px;
if (py < enclosingRectMinY)
enclosingRectMinY = py;
else if (py > enclosingRectMaxY)
enclosingRectMaxY = py;
double enclosingRectWidth = enclosingRectMaxX - enclosingRectMinX;
double enclosingRectHeight = enclosingRectMaxY - enclosingRectMinY;
return FloatRect(enclosingRectMinX, enclosingRectMinY, enclosingRectWidth, enclosingRectHeight);
}
bool AffineTransform::isIdentity() const
{
return ((m_transform.xx == 1) && (m_transform.yy == 1)
&& (m_transform.xy == 0) && (m_transform.yx == 0)
&& (m_transform.x0 == 0) && (m_transform.y0 == 0));
}
double AffineTransform::a() const
{
return m_transform.xx;
}
void AffineTransform::setA(double a)
{
m_transform.xx = a;
}
double AffineTransform::b() const
{
return m_transform.xy;
}
void AffineTransform::setB(double b)
{
m_transform.xy = b;
}
double AffineTransform::c() const
{
return m_transform.yx;
}
void AffineTransform::setC(double c)
{
m_transform.yx = c;
}
double AffineTransform::d() const
{
return m_transform.yy;
}
void AffineTransform::setD(double d)
{
m_transform.yy = d;
}
double AffineTransform::e() const
{
return m_transform.x0;
}
void AffineTransform::setE(double e)
{
m_transform.x0 = e;
}
double AffineTransform::f() const
{
return m_transform.y0;
}
void AffineTransform::setF(double f)
{
m_transform.y0 = f;
}
void AffineTransform::reset()
{
cairo_matrix_init_identity(&m_transform);
}
AffineTransform &AffineTransform::scale(double sx, double sy)
{
cairo_matrix_scale(&m_transform, sx, sy);
return *this;
}
AffineTransform &AffineTransform::rotate(double d)
{
cairo_matrix_rotate(&m_transform, d * deg2rad);
return *this;
}
AffineTransform &AffineTransform::translate(double tx, double ty)
{
cairo_matrix_translate(&m_transform, tx, ty);
return *this;
}
AffineTransform &AffineTransform::shear(double sx, double sy)
{
cairo_matrix_t shear;
cairo_matrix_init(&shear, 1, sy, sx, 1, 0, 0);
cairo_matrix_t result;
cairo_matrix_multiply(&result, &shear, &m_transform);
m_transform = result;
return *this;
}
double AffineTransform::det() const
{
return m_transform.xx * m_transform.yy - m_transform.xy * m_transform.yx;
}
AffineTransform AffineTransform::inverse() const
{
if (!isInvertible()) return AffineTransform();
cairo_matrix_t result = m_transform;
cairo_matrix_invert(&result);
return AffineTransform(result);
}
AffineTransform::operator cairo_matrix_t() const
{
return m_transform;
}
bool AffineTransform::operator== (const AffineTransform &m2) const
{
return ((m_transform.xx == m2.m_transform.xx)
&& (m_transform.yy == m2.m_transform.yy)
&& (m_transform.xy == m2.m_transform.xy)
&& (m_transform.yx == m2.m_transform.yx)
&& (m_transform.x0 == m2.m_transform.x0)
&& (m_transform.y0 == m2.m_transform.y0));
}
AffineTransform &AffineTransform::operator*= (const AffineTransform &m2)
{
cairo_matrix_t result;
cairo_matrix_multiply(&result, &m_transform, &m2.m_transform);
m_transform = result;
return *this;
}
AffineTransform AffineTransform::operator* (const AffineTransform &m2)
{
cairo_matrix_t result;
cairo_matrix_multiply(&result, &m_transform, &m2.m_transform);
return result;
}
}
// vim: ts=4 sw=4 et