| // Copyright 2014 PDFium Authors. All rights reserved. |
| // 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 <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" |
| #include "third_party/base/cxx17_backports.h" |
| |
| #ifndef NDEBUG |
| #include <ostream> |
| #endif |
| |
| 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 defined(OS_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 |
| |
| 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(const CFX_PointF* pPoints, int nPoints) { |
| if (nPoints == 0) |
| return CFX_FloatRect(); |
| |
| float min_x = pPoints->x; |
| float max_x = pPoints->x; |
| float min_y = pPoints->y; |
| float max_y = pPoints->y; |
| for (int i = 1; i < nPoints; i++) { |
| min_x = std::min(min_x, pPoints[i].x); |
| max_x = std::max(max_x, pPoints[i].x); |
| min_y = std::min(min_y, pPoints[i].y); |
| max_y = std::max(max_y, pPoints[i].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::base::saturated_cast<int>(floor(left)); |
| rect.bottom = pdfium::base::saturated_cast<int>(ceil(top)); |
| rect.right = pdfium::base::saturated_cast<int>(ceil(right)); |
| rect.top = pdfium::base::saturated_cast<int>(floor(bottom)); |
| rect.Normalize(); |
| return rect; |
| } |
| |
| FX_RECT CFX_FloatRect::GetInnerRect() const { |
| FX_RECT rect; |
| rect.left = pdfium::base::saturated_cast<int>(ceil(left)); |
| rect.bottom = pdfium::base::saturated_cast<int>(floor(top)); |
| rect.right = pdfium::base::saturated_cast<int>(floor(right)); |
| rect.top = pdfium::base::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)); |
| } |
| |
| 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()))); |
| } |
| |
| #ifndef NDEBUG |
| std::ostream& operator<<(std::ostream& os, const CFX_FloatRect& rect) { |
| os << "rect[w " << rect.Width() << " x h " << rect.Height() << " (left " |
| << rect.left << ", bot " << rect.bottom << ")]"; |
| return os; |
| } |
| |
| std::ostream& operator<<(std::ostream& os, const CFX_RectF& rect) { |
| os << "rect[w " << rect.Width() << " x h " << rect.Height() << " (left " |
| << rect.left << ", top " << rect.top << ")]"; |
| return os; |
| } |
| #endif // NDEBUG |
| |
| 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 sqrt(a * a + b * b); |
| } |
| |
| float CFX_Matrix::GetYUnit() const { |
| if (c == 0) |
| return (d > 0 ? d : -d); |
| if (d == 0) |
| return (c > 0 ? c : -c); |
| return sqrt(c * c + d * 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 sqrt(fx * fx + fy * 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 { |
| CFX_PointF 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 < pdfium::size(points); 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); |
| } |