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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/transform.h"
#include "ui/gfx/point3.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/skia_util.h"
namespace {
static int SymmetricRound(float x) {
return static_cast<int>(
x > 0
? std::floor(x + 0.5f)
: std::ceil(x - 0.5f));
}
} // namespace
namespace ui {
Transform::Transform() {
matrix_.reset();
}
Transform::~Transform() {}
bool Transform::operator==(const Transform& rhs) const {
return matrix_ == rhs.matrix_;
}
bool Transform::operator!=(const Transform& rhs) const {
return !(*this == rhs);
}
void Transform::SetRotate(float degree) {
matrix_.setRotateDegreesAbout(0, 0, 1, SkFloatToScalar(degree));
}
void Transform::SetScaleX(float x) {
matrix_.set(0, 0, SkFloatToScalar(x));
}
void Transform::SetScaleY(float y) {
matrix_.set(1, 1, SkFloatToScalar(y));
}
void Transform::SetScale(float x, float y) {
matrix_.setScale(
SkFloatToScalar(x),
SkFloatToScalar(y),
matrix_.get(2, 2));
}
void Transform::SetTranslateX(float x) {
matrix_.set(0, 3, SkFloatToScalar(x));
}
void Transform::SetTranslateY(float y) {
matrix_.set(1, 3, SkFloatToScalar(y));
}
void Transform::SetTranslate(float x, float y) {
matrix_.setTranslate(
SkFloatToScalar(x),
SkFloatToScalar(y),
matrix_.get(2, 3));
}
void Transform::ConcatRotate(float degree) {
SkMatrix44 rot;
rot.setRotateDegreesAbout(0, 0, 1, SkFloatToScalar(degree));
matrix_.postConcat(rot);
}
void Transform::ConcatScale(float x, float y) {
SkMatrix44 scale;
scale.setScale(SkFloatToScalar(x), SkFloatToScalar(y), 1);
matrix_.postConcat(scale);
}
void Transform::ConcatTranslate(float x, float y) {
SkMatrix44 translate;
translate.setTranslate(SkFloatToScalar(x), SkFloatToScalar(y), 0);
matrix_.postConcat(translate);
}
void Transform::PreconcatTransform(const Transform& transform) {
if (!transform.matrix_.isIdentity()) {
matrix_.preConcat(transform.matrix_);
}
}
void Transform::ConcatTransform(const Transform& transform) {
if (!transform.matrix_.isIdentity()) {
matrix_.postConcat(transform.matrix_);
}
}
bool Transform::HasChange() const {
return !matrix_.isIdentity();
}
void Transform::TransformPoint(gfx::Point& point) const {
TransformPointInternal(matrix_, point);
}
void Transform::TransformPoint(gfx::Point3f& point) const {
TransformPointInternal(matrix_, point);
}
bool Transform::TransformPointReverse(gfx::Point& point) const {
// TODO(sad): Try to avoid trying to invert the matrix.
SkMatrix44 inverse;
if (!matrix_.invert(&inverse))
return false;
TransformPointInternal(inverse, point);
return true;
}
bool Transform::TransformPointReverse(gfx::Point3f& point) const {
// TODO(sad): Try to avoid trying to invert the matrix.
SkMatrix44 inverse;
if (!matrix_.invert(&inverse))
return false;
TransformPointInternal(inverse, point);
return true;
}
void Transform::TransformRect(gfx::Rect* rect) const {
SkRect src = gfx::RectToSkRect(*rect);
const SkMatrix& matrix = matrix_;
matrix.mapRect(&src);
*rect = gfx::SkRectToRect(src);
}
bool Transform::TransformRectReverse(gfx::Rect* rect) const {
SkMatrix44 inverse;
if (!matrix_.invert(&inverse))
return false;
const SkMatrix& matrix = inverse;
SkRect src = gfx::RectToSkRect(*rect);
matrix.mapRect(&src);
*rect = gfx::SkRectToRect(src);
return true;
}
void Transform::TransformPointInternal(const SkMatrix44& xform,
gfx::Point3f& point) const {
SkScalar p[4] = {
SkFloatToScalar(point.x()),
SkFloatToScalar(point.y()),
SkFloatToScalar(point.z()),
1 };
xform.map(p);
if (p[3] != 1 && abs(p[3]) > 0) {
point.SetPoint(p[0] / p[3], p[1] / p[3], p[2]/ p[3]);
} else {
point.SetPoint(p[0], p[1], p[2]);
}
}
void Transform::TransformPointInternal(const SkMatrix44& xform,
gfx::Point& point) const {
SkScalar p[4] = {
SkIntToScalar(point.x()),
SkIntToScalar(point.y()),
0,
1 };
xform.map(p);
point.SetPoint(SymmetricRound(p[0]),
SymmetricRound(p[1]));
}
} // namespace ui
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