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/*
* Copyright (C) 2005, 2006 Apple Computer, Inc. All rights reserved.
* 2010 Dirk Schulze <krit@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* 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,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_AFFINE_TRANSFORM_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_AFFINE_TRANSFORM_H_
#include <string.h> // for memcpy
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "ui/gfx/geometry/double4.h"
namespace gfx {
class PointF;
class QuadF;
class Rect;
class RectF;
class Transform;
} // namespace gfx
class SkMatrix;
class SkM44;
namespace blink {
class PLATFORM_EXPORT AffineTransform {
DISALLOW_NEW();
public:
constexpr AffineTransform() : transform_{1, 0, 0, 1, 0, 0} {}
constexpr AffineTransform(double a,
double b,
double c,
double d,
double e,
double f)
: transform_{a, b, c, d, e, f} {}
void SetMatrix(double a, double b, double c, double d, double e, double f) {
*this = AffineTransform(a, b, c, d, e, f);
}
[[nodiscard]] gfx::PointF MapPoint(const gfx::PointF&) const;
// Rounds the resulting mapped rectangle out. This is helpful for bounding
// box computations but may not be what is wanted in other contexts.
[[nodiscard]] gfx::Rect MapRect(const gfx::Rect&) const;
[[nodiscard]] gfx::RectF MapRect(const gfx::RectF&) const;
[[nodiscard]] gfx::QuadF MapQuad(const gfx::QuadF&) const;
bool IsIdentity() const {
return gfx::AllTrue(
gfx::LoadDouble4(transform_) == gfx::Double4{1, 0, 0, 1} &
gfx::LoadDouble4(&transform_[2]) == gfx::Double4{0, 1, 0, 0});
}
bool IsIdentityOrTranslation() const {
return gfx::AllTrue(gfx::LoadDouble4(transform_) ==
gfx::Double4{1, 0, 0, 1});
}
double A() const { return transform_[0]; }
void SetA(double a) { transform_[0] = a; }
double B() const { return transform_[1]; }
void SetB(double b) { transform_[1] = b; }
double C() const { return transform_[2]; }
void SetC(double c) { transform_[2] = c; }
double D() const { return transform_[3]; }
void SetD(double d) { transform_[3] = d; }
double E() const { return transform_[4]; }
void SetE(double e) { transform_[4] = e; }
double F() const { return transform_[5]; }
void SetF(double f) { transform_[5] = f; }
void MakeIdentity() { *this = AffineTransform(); }
// this' = this * other
AffineTransform& PreConcat(const AffineTransform& other);
// this' = other * this
AffineTransform& PostConcat(const AffineTransform& other);
// The semantics of the following methods are the same as PreConcat(), i.e.
// this' = this * operation.
AffineTransform& Scale(double);
AffineTransform& Scale(double sx, double sy);
AffineTransform& ScaleNonUniform(double sx, double sy);
AffineTransform& Rotate(double a);
AffineTransform& RotateRadians(double a);
AffineTransform& RotateFromVector(double x, double y);
AffineTransform& Translate(double tx, double ty);
AffineTransform& Shear(double sx, double sy);
AffineTransform& FlipX();
AffineTransform& FlipY();
AffineTransform& Skew(double angle_x, double angle_y);
AffineTransform& SkewX(double angle);
AffineTransform& SkewY(double angle);
double XScaleSquared() const;
double XScale() const;
double YScaleSquared() const;
double YScale() const;
double Det() const;
bool IsInvertible() const;
[[nodiscard]] AffineTransform Inverse() const;
// Creates an AffineTransform by extracting affine components from
// gfx::Transform and ignoring other components.
[[nodiscard]] static AffineTransform FromTransform(const gfx::Transform&);
[[nodiscard]] gfx::Transform ToTransform() const;
[[nodiscard]] SkMatrix ToSkMatrix() const;
[[nodiscard]] SkM44 ToSkM44() const;
bool operator==(const AffineTransform& m2) const {
return gfx::AllTrue(gfx::LoadDouble4(transform_) ==
gfx::LoadDouble4(m2.transform_) &
gfx::LoadDouble4(&transform_[2]) ==
gfx::LoadDouble4(&m2.transform_[2]));
}
bool operator!=(const AffineTransform& other) const {
return !(*this == other);
}
// *this = *this * t (i.e., a multRight)
AffineTransform& operator*=(const AffineTransform& t) { return PreConcat(t); }
// result = *this * t (i.e., a multRight)
AffineTransform operator*(const AffineTransform& t) const {
AffineTransform result = *this;
result *= t;
return result;
}
[[nodiscard]] static constexpr AffineTransform MakeSkewX(double angle) {
return AffineTransform(1, 0, std::tan(Deg2rad(angle)), 1, 0, 0);
}
[[nodiscard]] static constexpr AffineTransform MakeSkewY(double angle) {
return AffineTransform(1, std::tan(Deg2rad(angle)), 0, 1, 0, 0);
}
[[nodiscard]] static constexpr AffineTransform Translation(double x,
double y) {
return AffineTransform(1, 0, 0, 1, x, y);
}
[[nodiscard]] static constexpr AffineTransform MakeScale(double s) {
return MakeScaleNonUniform(s, s);
}
[[nodiscard]] static constexpr AffineTransform MakeScaleNonUniform(
double sx,
double sy) {
return AffineTransform(sx, 0, 0, sy, 0, 0);
}
[[nodiscard]] static AffineTransform MakeRotationAroundPoint(double angle,
double cx,
double cy) {
AffineTransform result = Translation(cx, cy);
result.Rotate(angle);
result.Translate(-cx, -cy);
return result;
}
// The 2d version of gfx::Transform::Zoom().
AffineTransform& Zoom(double zoom_factor);
// If |as_matrix| is true, the transform is returned as a matrix in row-major
// order. Otherwise, the transform's decomposition is returned which shows
// the translation, scale, etc.
String ToString(bool as_matrix = false) const;
private:
static float ClampToFloat(double value) {
return ClampToWithNaNTo0<float>(value);
}
double transform_[6];
};
PLATFORM_EXPORT std::ostream& operator<<(std::ostream&, const AffineTransform&);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_AFFINE_TRANSFORM_H_
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