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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/fx_coordinates.h"
#include <math.h>
#include <algorithm>
#include <array>
#include <iterator>
#include <utility>
#include "build/build_config.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/fx_system.h"
namespace {
void MatchFloatRange(float f1, float f2, int* i1, int* i2) {
float length = ceilf(f2 - f1);
float f1_floor = floorf(f1);
float f1_ceil = ceilf(f1);
float error1 = f1 - f1_floor + fabsf(f2 - f1_floor - length);
float error2 = f1_ceil - f1 + fabsf(f2 - f1_ceil - length);
float start = error1 > error2 ? f1_ceil : f1_floor;
FX_SAFE_INT32 safe1 = start;
FX_SAFE_INT32 safe2 = start + length;
if (safe1.IsValid() && safe2.IsValid()) {
*i1 = safe1.ValueOrDie();
*i2 = safe2.ValueOrDie();
} else {
*i1 = 0;
*i2 = 0;
}
}
#if BUILDFLAG(IS_WIN)
static_assert(sizeof(FX_RECT) == sizeof(RECT), "FX_RECT vs. RECT mismatch");
static_assert(offsetof(FX_RECT, left) == offsetof(RECT, left),
"FX_RECT vs. RECT mismatch");
static_assert(offsetof(FX_RECT, top) == offsetof(RECT, top),
"FX_RECT vs. RECT mismatch");
static_assert(offsetof(FX_RECT, right) == offsetof(RECT, right),
"FX_RECT vs. RECT mismatch");
static_assert(offsetof(FX_RECT, bottom) == offsetof(RECT, bottom),
"FX_RECT vs. RECT mismatch");
static_assert(sizeof(FX_RECT::left) == sizeof(RECT::left),
"FX_RECT vs. RECT mismatch");
static_assert(sizeof(FX_RECT::top) == sizeof(RECT::top),
"FX_RECT vs. RECT mismatch");
static_assert(sizeof(FX_RECT::right) == sizeof(RECT::right),
"FX_RECT vs. RECT mismatch");
static_assert(sizeof(FX_RECT::bottom) == sizeof(RECT::bottom),
"FX_RECT vs. RECT mismatch");
#endif
} // namespace
template <>
float CFX_VTemplate<float>::Length() const {
return hypotf(x, y);
}
template <>
void CFX_VTemplate<float>::Normalize() {
float fLen = Length();
if (fLen < 0.0001f)
return;
x /= fLen;
y /= fLen;
}
bool FX_RECT::Valid() const {
FX_SAFE_INT32 w = right;
FX_SAFE_INT32 h = bottom;
w -= left;
h -= top;
return w.IsValid() && h.IsValid();
}
void FX_RECT::Normalize() {
if (left > right)
std::swap(left, right);
if (top > bottom)
std::swap(top, bottom);
}
void FX_RECT::Intersect(const FX_RECT& src) {
FX_RECT src_n = src;
src_n.Normalize();
Normalize();
left = std::max(left, src_n.left);
top = std::max(top, src_n.top);
right = std::min(right, src_n.right);
bottom = std::min(bottom, src_n.bottom);
if (left > right || top > bottom) {
left = top = right = bottom = 0;
}
}
FX_RECT FX_RECT::SwappedClipBox(int width,
int height,
bool bFlipX,
bool bFlipY) const {
FX_RECT rect;
if (bFlipY) {
rect.left = height - top;
rect.right = height - bottom;
} else {
rect.left = top;
rect.right = bottom;
}
if (bFlipX) {
rect.top = width - left;
rect.bottom = width - right;
} else {
rect.top = left;
rect.bottom = right;
}
rect.Normalize();
return rect;
}
// Y-axis runs the opposite way in FX_RECT.
CFX_FloatRect::CFX_FloatRect(const FX_RECT& rect)
: left(rect.left), bottom(rect.top), right(rect.right), top(rect.bottom) {}
CFX_FloatRect::CFX_FloatRect(const CFX_PointF& point)
: left(point.x), bottom(point.y), right(point.x), top(point.y) {}
// static
CFX_FloatRect CFX_FloatRect::GetBBox(pdfium::span<const CFX_PointF> pPoints) {
if (pPoints.empty())
return CFX_FloatRect();
float min_x = pPoints.front().x;
float max_x = pPoints.front().x;
float min_y = pPoints.front().y;
float max_y = pPoints.front().y;
for (const auto& point : pPoints.subspan(1)) {
min_x = std::min(min_x, point.x);
max_x = std::max(max_x, point.x);
min_y = std::min(min_y, point.y);
max_y = std::max(max_y, point.y);
}
return CFX_FloatRect(min_x, min_y, max_x, max_y);
}
void CFX_FloatRect::Normalize() {
if (left > right)
std::swap(left, right);
if (bottom > top)
std::swap(top, bottom);
}
void CFX_FloatRect::Intersect(const CFX_FloatRect& other_rect) {
Normalize();
CFX_FloatRect other = other_rect;
other.Normalize();
left = std::max(left, other.left);
bottom = std::max(bottom, other.bottom);
right = std::min(right, other.right);
top = std::min(top, other.top);
if (left > right || bottom > top)
*this = CFX_FloatRect();
}
void CFX_FloatRect::Union(const CFX_FloatRect& other_rect) {
Normalize();
CFX_FloatRect other = other_rect;
other.Normalize();
left = std::min(left, other.left);
bottom = std::min(bottom, other.bottom);
right = std::max(right, other.right);
top = std::max(top, other.top);
}
FX_RECT CFX_FloatRect::GetOuterRect() const {
FX_RECT rect;
rect.left = pdfium::saturated_cast<int>(floor(left));
rect.bottom = pdfium::saturated_cast<int>(ceil(top));
rect.right = pdfium::saturated_cast<int>(ceil(right));
rect.top = pdfium::saturated_cast<int>(floor(bottom));
rect.Normalize();
return rect;
}
FX_RECT CFX_FloatRect::GetInnerRect() const {
FX_RECT rect;
rect.left = pdfium::saturated_cast<int>(ceil(left));
rect.bottom = pdfium::saturated_cast<int>(floor(top));
rect.right = pdfium::saturated_cast<int>(floor(right));
rect.top = pdfium::saturated_cast<int>(ceil(bottom));
rect.Normalize();
return rect;
}
FX_RECT CFX_FloatRect::GetClosestRect() const {
FX_RECT rect;
MatchFloatRange(left, right, &rect.left, &rect.right);
MatchFloatRange(bottom, top, &rect.top, &rect.bottom);
rect.Normalize();
return rect;
}
CFX_FloatRect CFX_FloatRect::GetCenterSquare() const {
float fWidth = Width();
float fHeight = Height();
float fHalfWidth = (fWidth > fHeight) ? fHeight / 2 : fWidth / 2;
float fCenterX = (left + right) / 2.0f;
float fCenterY = (top + bottom) / 2.0f;
return CFX_FloatRect(fCenterX - fHalfWidth, fCenterY - fHalfWidth,
fCenterX + fHalfWidth, fCenterY + fHalfWidth);
}
bool CFX_FloatRect::Contains(const CFX_PointF& point) const {
CFX_FloatRect n1(*this);
n1.Normalize();
return point.x <= n1.right && point.x >= n1.left && point.y <= n1.top &&
point.y >= n1.bottom;
}
bool CFX_FloatRect::Contains(const CFX_FloatRect& other_rect) const {
CFX_FloatRect n1(*this);
CFX_FloatRect n2(other_rect);
n1.Normalize();
n2.Normalize();
return n2.left >= n1.left && n2.right <= n1.right && n2.bottom >= n1.bottom &&
n2.top <= n1.top;
}
void CFX_FloatRect::UpdateRect(const CFX_PointF& point) {
left = std::min(left, point.x);
bottom = std::min(bottom, point.y);
right = std::max(right, point.x);
top = std::max(top, point.y);
}
void CFX_FloatRect::Inflate(float x, float y) {
Inflate(x, y, x, y);
}
void CFX_FloatRect::Inflate(float other_left,
float other_bottom,
float other_right,
float other_top) {
Normalize();
left -= other_left;
bottom -= other_bottom;
right += other_right;
top += other_top;
}
void CFX_FloatRect::Inflate(const CFX_FloatRect& rt) {
Inflate(rt.left, rt.bottom, rt.right, rt.top);
}
void CFX_FloatRect::Deflate(float x, float y) {
Deflate(x, y, x, y);
}
void CFX_FloatRect::Deflate(float other_left,
float other_bottom,
float other_right,
float other_top) {
Inflate(-other_left, -other_bottom, -other_right, -other_top);
}
void CFX_FloatRect::Deflate(const CFX_FloatRect& rt) {
Deflate(rt.left, rt.bottom, rt.right, rt.top);
}
CFX_FloatRect CFX_FloatRect::GetDeflated(float x, float y) const {
if (IsEmpty())
return CFX_FloatRect();
CFX_FloatRect that = *this;
that.Deflate(x, y);
that.Normalize();
return that;
}
void CFX_FloatRect::Translate(float e, float f) {
left += e;
right += e;
top += f;
bottom += f;
}
void CFX_FloatRect::Scale(float fScale) {
left *= fScale;
bottom *= fScale;
right *= fScale;
top *= fScale;
}
void CFX_FloatRect::ScaleFromCenterPoint(float fScale) {
float fHalfWidth = (right - left) / 2.0f;
float fHalfHeight = (top - bottom) / 2.0f;
float center_x = (left + right) / 2;
float center_y = (top + bottom) / 2;
left = center_x - fHalfWidth * fScale;
bottom = center_y - fHalfHeight * fScale;
right = center_x + fHalfWidth * fScale;
top = center_y + fHalfHeight * fScale;
}
FX_RECT CFX_FloatRect::ToFxRect() const {
return FX_RECT(static_cast<int>(left), static_cast<int>(top),
static_cast<int>(right), static_cast<int>(bottom));
}
FX_RECT CFX_FloatRect::ToRoundedFxRect() const {
return FX_RECT(FXSYS_roundf(left), FXSYS_roundf(top), FXSYS_roundf(right),
FXSYS_roundf(bottom));
}
void CFX_RectF::Union(float x, float y) {
float r = right();
float b = bottom();
left = std::min(left, x);
top = std::min(top, y);
r = std::max(r, x);
b = std::max(b, y);
width = r - left;
height = b - top;
}
void CFX_RectF::Union(const CFX_RectF& rt) {
float r = right();
float b = bottom();
left = std::min(left, rt.left);
top = std::min(top, rt.top);
r = std::max(r, rt.right());
b = std::max(b, rt.bottom());
width = r - left;
height = b - top;
}
void CFX_RectF::Intersect(const CFX_RectF& rt) {
float r = right();
float b = bottom();
left = std::max(left, rt.left);
top = std::max(top, rt.top);
r = std::min(r, rt.right());
b = std::min(b, rt.bottom());
width = r - left;
height = b - top;
}
FX_RECT CFX_RectF::GetOuterRect() const {
return FX_RECT(static_cast<int32_t>(floor(left)),
static_cast<int32_t>(floor(top)),
static_cast<int32_t>(ceil(right())),
static_cast<int32_t>(ceil(bottom())));
}
CFX_Matrix CFX_Matrix::GetInverse() const {
CFX_Matrix inverse;
float i = a * d - b * c;
if (fabs(i) == 0)
return inverse;
float j = -i;
inverse.a = d / i;
inverse.b = b / j;
inverse.c = c / j;
inverse.d = a / i;
inverse.e = (c * f - d * e) / i;
inverse.f = (a * f - b * e) / j;
return inverse;
}
bool CFX_Matrix::Is90Rotated() const {
return fabs(a * 1000) < fabs(b) && fabs(d * 1000) < fabs(c);
}
bool CFX_Matrix::IsScaled() const {
return fabs(b * 1000) < fabs(a) && fabs(c * 1000) < fabs(d);
}
void CFX_Matrix::Translate(float x, float y) {
e += x;
f += y;
}
void CFX_Matrix::TranslatePrepend(float x, float y) {
e += x * a + y * c;
f += y * d + x * b;
}
void CFX_Matrix::Scale(float sx, float sy) {
a *= sx;
b *= sy;
c *= sx;
d *= sy;
e *= sx;
f *= sy;
}
void CFX_Matrix::Rotate(float fRadian) {
float cosValue = cos(fRadian);
float sinValue = sin(fRadian);
Concat(CFX_Matrix(cosValue, sinValue, -sinValue, cosValue, 0, 0));
}
void CFX_Matrix::MatchRect(const CFX_FloatRect& dest,
const CFX_FloatRect& src) {
float fDiff = src.left - src.right;
a = fabs(fDiff) < 0.001f ? 1 : (dest.left - dest.right) / fDiff;
fDiff = src.bottom - src.top;
d = fabs(fDiff) < 0.001f ? 1 : (dest.bottom - dest.top) / fDiff;
e = dest.left - src.left * a;
f = dest.bottom - src.bottom * d;
b = 0;
c = 0;
}
float CFX_Matrix::GetXUnit() const {
if (b == 0)
return (a > 0 ? a : -a);
if (a == 0)
return (b > 0 ? b : -b);
return hypotf(a, b);
}
float CFX_Matrix::GetYUnit() const {
if (c == 0)
return (d > 0 ? d : -d);
if (d == 0)
return (c > 0 ? c : -c);
return hypotf(c, d);
}
CFX_FloatRect CFX_Matrix::GetUnitRect() const {
return TransformRect(CFX_FloatRect(0.f, 0.f, 1.f, 1.f));
}
float CFX_Matrix::TransformXDistance(float dx) const {
float fx = a * dx;
float fy = b * dx;
return hypotf(fx, fy);
}
float CFX_Matrix::TransformDistance(float distance) const {
return distance * (GetXUnit() + GetYUnit()) / 2;
}
CFX_PointF CFX_Matrix::Transform(const CFX_PointF& point) const {
return CFX_PointF(a * point.x + c * point.y + e,
b * point.x + d * point.y + f);
}
CFX_RectF CFX_Matrix::TransformRect(const CFX_RectF& rect) const {
CFX_FloatRect result_rect = TransformRect(rect.ToFloatRect());
return CFX_RectF(result_rect.left, result_rect.bottom, result_rect.Width(),
result_rect.Height());
}
CFX_FloatRect CFX_Matrix::TransformRect(const CFX_FloatRect& rect) const {
std::array<CFX_PointF, 4> points = {{{rect.left, rect.top},
{rect.left, rect.bottom},
{rect.right, rect.top},
{rect.right, rect.bottom}}};
for (CFX_PointF& point : points) {
point = Transform(point);
}
float new_right = points[0].x;
float new_left = points[0].x;
float new_top = points[0].y;
float new_bottom = points[0].y;
for (size_t i = 1; i < points.size(); i++) {
new_right = std::max(new_right, points[i].x);
new_left = std::min(new_left, points[i].x);
new_top = std::max(new_top, points[i].y);
new_bottom = std::min(new_bottom, points[i].y);
}
return CFX_FloatRect(new_left, new_bottom, new_right, new_top);
}