| // Copyright 2016 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/fxge/cfx_pathdata.h" |
| |
| #include "core/fxcrt/fx_system.h" |
| #include "third_party/base/numerics/safe_math.h" |
| |
| namespace { |
| |
| bool IsFoldingVerticalLine(const CFX_PointF& a, |
| const CFX_PointF& b, |
| const CFX_PointF& c) { |
| return a.x == b.x && b.x == c.x && (b.y - a.y) * (b.y - c.y) > 0; |
| } |
| |
| bool IsFoldingHorizontalLine(const CFX_PointF& a, |
| const CFX_PointF& b, |
| const CFX_PointF& c) { |
| return a.y == b.y && b.y == c.y && (b.x - a.x) * (b.x - c.x) > 0; |
| } |
| |
| bool IsClosedFigure(const FX_PATHPOINT& prev, const FX_PATHPOINT& next) { |
| return prev.m_Type == FXPT_TYPE::MoveTo && next.m_Type == FXPT_TYPE::LineTo && |
| prev.m_Point == next.m_Point && next.m_CloseFigure; |
| } |
| |
| void UpdateLineEndPoints(CFX_FloatRect* rect, |
| const CFX_PointF& start_pos, |
| const CFX_PointF& end_pos, |
| float hw) { |
| if (start_pos.x == end_pos.x) { |
| if (start_pos.y == end_pos.y) { |
| rect->UpdateRect(end_pos + CFX_PointF(hw, hw)); |
| rect->UpdateRect(end_pos - CFX_PointF(hw, hw)); |
| return; |
| } |
| |
| float point_y; |
| if (end_pos.y < start_pos.y) |
| point_y = end_pos.y - hw; |
| else |
| point_y = end_pos.y + hw; |
| |
| rect->UpdateRect(CFX_PointF(end_pos.x + hw, point_y)); |
| rect->UpdateRect(CFX_PointF(end_pos.x - hw, point_y)); |
| return; |
| } |
| |
| if (start_pos.y == end_pos.y) { |
| float point_x; |
| if (end_pos.x < start_pos.x) |
| point_x = end_pos.x - hw; |
| else |
| point_x = end_pos.x + hw; |
| |
| rect->UpdateRect(CFX_PointF(point_x, end_pos.y + hw)); |
| rect->UpdateRect(CFX_PointF(point_x, end_pos.y - hw)); |
| return; |
| } |
| |
| CFX_PointF diff = end_pos - start_pos; |
| float ll = FXSYS_sqrt2(diff.x, diff.y); |
| float mx = end_pos.x + hw * diff.x / ll; |
| float my = end_pos.y + hw * diff.y / ll; |
| float dx1 = hw * diff.y / ll; |
| float dy1 = hw * diff.x / ll; |
| rect->UpdateRect(CFX_PointF(mx - dx1, my + dy1)); |
| rect->UpdateRect(CFX_PointF(mx + dx1, my - dy1)); |
| } |
| |
| void UpdateLineJoinPoints(CFX_FloatRect* rect, |
| const CFX_PointF& start_pos, |
| const CFX_PointF& mid_pos, |
| const CFX_PointF& end_pos, |
| float half_width, |
| float miter_limit) { |
| float start_k = 0; |
| float start_c = 0; |
| float end_k = 0; |
| float end_c = 0; |
| float start_len = 0; |
| float start_dc = 0; |
| float end_len = 0; |
| float end_dc = 0; |
| float one_twentieth = 1.0f / 20; |
| |
| bool bStartVert = fabs(start_pos.x - mid_pos.x) < one_twentieth; |
| bool bEndVert = fabs(mid_pos.x - end_pos.x) < one_twentieth; |
| if (bStartVert && bEndVert) { |
| int start_dir = mid_pos.y > start_pos.y ? 1 : -1; |
| float point_y = mid_pos.y + half_width * start_dir; |
| rect->UpdateRect(CFX_PointF(mid_pos.x + half_width, point_y)); |
| rect->UpdateRect(CFX_PointF(mid_pos.x - half_width, point_y)); |
| return; |
| } |
| |
| if (!bStartVert) { |
| CFX_PointF start_to_mid = start_pos - mid_pos; |
| start_k = (mid_pos.y - start_pos.y) / (mid_pos.x - start_pos.x); |
| start_c = mid_pos.y - (start_k * mid_pos.x); |
| start_len = FXSYS_sqrt2(start_to_mid.x, start_to_mid.y); |
| start_dc = |
| static_cast<float>(fabs(half_width * start_len / start_to_mid.x)); |
| } |
| if (!bEndVert) { |
| CFX_PointF end_to_mid = end_pos - mid_pos; |
| end_k = end_to_mid.y / end_to_mid.x; |
| end_c = mid_pos.y - (end_k * mid_pos.x); |
| end_len = FXSYS_sqrt2(end_to_mid.x, end_to_mid.y); |
| end_dc = static_cast<float>(fabs(half_width * end_len / end_to_mid.x)); |
| } |
| if (bStartVert) { |
| CFX_PointF outside(start_pos.x, 0); |
| if (end_pos.x < start_pos.x) |
| outside.x += half_width; |
| else |
| outside.x -= half_width; |
| |
| if (start_pos.y < (end_k * start_pos.x) + end_c) |
| outside.y = (end_k * outside.x) + end_c + end_dc; |
| else |
| outside.y = (end_k * outside.x) + end_c - end_dc; |
| |
| rect->UpdateRect(outside); |
| return; |
| } |
| |
| if (bEndVert) { |
| CFX_PointF outside(end_pos.x, 0); |
| if (start_pos.x < end_pos.x) |
| outside.x += half_width; |
| else |
| outside.x -= half_width; |
| |
| if (end_pos.y < (start_k * end_pos.x) + start_c) |
| outside.y = (start_k * outside.x) + start_c + start_dc; |
| else |
| outside.y = (start_k * outside.x) + start_c - start_dc; |
| |
| rect->UpdateRect(outside); |
| return; |
| } |
| |
| if (fabs(start_k - end_k) < one_twentieth) { |
| int start_dir = mid_pos.x > start_pos.x ? 1 : -1; |
| int end_dir = end_pos.x > mid_pos.x ? 1 : -1; |
| if (start_dir == end_dir) |
| UpdateLineEndPoints(rect, mid_pos, end_pos, half_width); |
| else |
| UpdateLineEndPoints(rect, start_pos, mid_pos, half_width); |
| return; |
| } |
| |
| float start_outside_c = start_c; |
| if (end_pos.y < (start_k * end_pos.x) + start_c) |
| start_outside_c += start_dc; |
| else |
| start_outside_c -= start_dc; |
| |
| float end_outside_c = end_c; |
| if (start_pos.y < (end_k * start_pos.x) + end_c) |
| end_outside_c += end_dc; |
| else |
| end_outside_c -= end_dc; |
| |
| float join_x = (end_outside_c - start_outside_c) / (start_k - end_k); |
| float join_y = start_k * join_x + start_outside_c; |
| rect->UpdateRect(CFX_PointF(join_x, join_y)); |
| } |
| |
| } // namespace |
| |
| FX_PATHPOINT::FX_PATHPOINT() = default; |
| |
| FX_PATHPOINT::FX_PATHPOINT(const CFX_PointF& point, FXPT_TYPE type, bool close) |
| : m_Point(point), m_Type(type), m_CloseFigure(close) {} |
| |
| FX_PATHPOINT::FX_PATHPOINT(const FX_PATHPOINT& other) = default; |
| |
| FX_PATHPOINT::~FX_PATHPOINT() = default; |
| |
| CFX_PathData::CFX_PathData() = default; |
| |
| CFX_PathData::CFX_PathData(const CFX_PathData& src) = default; |
| |
| CFX_PathData::CFX_PathData(CFX_PathData&& src) = default; |
| |
| CFX_PathData::~CFX_PathData() = default; |
| |
| void CFX_PathData::Clear() { |
| m_Points.clear(); |
| } |
| |
| void CFX_PathData::ClosePath() { |
| if (m_Points.empty()) |
| return; |
| m_Points.back().m_CloseFigure = true; |
| } |
| |
| void CFX_PathData::Append(const CFX_PathData* pSrc, const CFX_Matrix* pMatrix) { |
| if (pSrc->m_Points.empty()) |
| return; |
| |
| size_t cur_size = m_Points.size(); |
| m_Points.insert(m_Points.end(), pSrc->m_Points.begin(), pSrc->m_Points.end()); |
| |
| if (!pMatrix) |
| return; |
| |
| for (size_t i = cur_size; i < m_Points.size(); i++) |
| m_Points[i].m_Point = pMatrix->Transform(m_Points[i].m_Point); |
| } |
| |
| void CFX_PathData::AppendPoint(const CFX_PointF& point, |
| FXPT_TYPE type, |
| bool closeFigure) { |
| m_Points.push_back(FX_PATHPOINT(point, type, closeFigure)); |
| } |
| |
| void CFX_PathData::AppendLine(const CFX_PointF& pt1, const CFX_PointF& pt2) { |
| if (m_Points.empty() || fabs(m_Points.back().m_Point.x - pt1.x) > 0.001 || |
| fabs(m_Points.back().m_Point.y - pt1.y) > 0.001) { |
| AppendPoint(pt1, FXPT_TYPE::MoveTo, false); |
| } |
| AppendPoint(pt2, FXPT_TYPE::LineTo, false); |
| } |
| |
| void CFX_PathData::AppendRect(const CFX_FloatRect& rect) { |
| return AppendRect(rect.left, rect.bottom, rect.right, rect.top); |
| } |
| |
| void CFX_PathData::AppendRect(float left, |
| float bottom, |
| float right, |
| float top) { |
| CFX_PointF left_bottom(left, bottom); |
| CFX_PointF left_top(left, top); |
| CFX_PointF right_top(right, top); |
| CFX_PointF right_bottom(right, bottom); |
| |
| AppendLine(left_bottom, left_top); |
| AppendLine(left_top, right_top); |
| AppendLine(right_top, right_bottom); |
| AppendLine(right_bottom, left_bottom); |
| ClosePath(); |
| } |
| |
| CFX_FloatRect CFX_PathData::GetBoundingBox() const { |
| if (m_Points.empty()) |
| return CFX_FloatRect(); |
| |
| CFX_FloatRect rect; |
| rect.InitRect(m_Points[0].m_Point); |
| for (size_t i = 1; i < m_Points.size(); i++) |
| rect.UpdateRect(m_Points[i].m_Point); |
| return rect; |
| } |
| |
| CFX_FloatRect CFX_PathData::GetBoundingBox(float line_width, |
| float miter_limit) const { |
| CFX_FloatRect rect(100000.0f, 100000.0f, -100000.0f, -100000.0f); |
| size_t iPoint = 0; |
| float half_width = line_width; |
| int iStartPoint = 0; |
| int iEndPoint = 0; |
| int iMiddlePoint = 0; |
| bool bJoin; |
| while (iPoint < m_Points.size()) { |
| if (m_Points[iPoint].IsTypeAndOpen(FXPT_TYPE::MoveTo)) { |
| if (iPoint + 1 == m_Points.size()) |
| break; |
| |
| iStartPoint = iPoint + 1; |
| iEndPoint = iPoint; |
| bJoin = false; |
| } else { |
| if (m_Points[iPoint].IsTypeAndOpen(FXPT_TYPE::BezierTo)) { |
| rect.UpdateRect(m_Points[iPoint].m_Point); |
| rect.UpdateRect(m_Points[iPoint + 1].m_Point); |
| iPoint += 2; |
| } |
| if (iPoint == m_Points.size() - 1 || |
| m_Points[iPoint + 1].IsTypeAndOpen(FXPT_TYPE::MoveTo)) { |
| iStartPoint = iPoint - 1; |
| iEndPoint = iPoint; |
| bJoin = false; |
| } else { |
| iStartPoint = iPoint - 1; |
| iMiddlePoint = iPoint; |
| iEndPoint = iPoint + 1; |
| bJoin = true; |
| } |
| } |
| |
| CFX_PointF start_pos = m_Points[iStartPoint].m_Point; |
| CFX_PointF end_pos = m_Points[iEndPoint].m_Point; |
| if (bJoin) { |
| CFX_PointF mid_pos = m_Points[iMiddlePoint].m_Point; |
| UpdateLineJoinPoints(&rect, start_pos, mid_pos, end_pos, half_width, |
| miter_limit); |
| } else { |
| UpdateLineEndPoints(&rect, start_pos, end_pos, half_width); |
| } |
| iPoint++; |
| } |
| return rect; |
| } |
| |
| void CFX_PathData::Transform(const CFX_Matrix& matrix) { |
| for (auto& point : m_Points) |
| point.m_Point = matrix.Transform(point.m_Point); |
| } |
| |
| bool CFX_PathData::GetZeroAreaPath(const CFX_Matrix* pMatrix, |
| bool bAdjust, |
| CFX_PathData* NewPath, |
| bool* bThin, |
| bool* setIdentity) const { |
| *setIdentity = false; |
| if (m_Points.size() < 3) |
| return false; |
| |
| if (m_Points.size() == 3 && m_Points[0].m_Type == FXPT_TYPE::MoveTo && |
| m_Points[1].m_Type == FXPT_TYPE::LineTo && |
| m_Points[2].m_Type == FXPT_TYPE::LineTo && |
| m_Points[0].m_Point == m_Points[2].m_Point) { |
| for (size_t i = 0; i < 2; i++) { |
| CFX_PointF point = m_Points[i].m_Point; |
| if (bAdjust) { |
| if (pMatrix) |
| point = pMatrix->Transform(point); |
| |
| point = CFX_PointF(static_cast<int>(point.x) + 0.5f, |
| static_cast<int>(point.y) + 0.5f); |
| } |
| NewPath->AppendPoint( |
| point, i == 0 ? FXPT_TYPE::MoveTo : FXPT_TYPE::LineTo, false); |
| } |
| if (bAdjust && pMatrix) |
| *setIdentity = true; |
| |
| // Note, they both have to be not equal. |
| if (m_Points[0].m_Point.x != m_Points[1].m_Point.x && |
| m_Points[0].m_Point.y != m_Points[1].m_Point.y) { |
| *bThin = true; |
| } |
| return true; |
| } |
| |
| if (((m_Points.size() > 3) && (m_Points.size() % 2))) { |
| int mid = m_Points.size() / 2; |
| bool bZeroArea = false; |
| CFX_PathData t_path; |
| for (int i = 0; i < mid; i++) { |
| if (!(m_Points[mid - i - 1].m_Point == m_Points[mid + i + 1].m_Point && |
| m_Points[mid - i - 1].m_Type != FXPT_TYPE::BezierTo && |
| m_Points[mid + i + 1].m_Type != FXPT_TYPE::BezierTo)) { |
| bZeroArea = true; |
| break; |
| } |
| |
| t_path.AppendPoint(m_Points[mid - i].m_Point, FXPT_TYPE::MoveTo, false); |
| t_path.AppendPoint(m_Points[mid - i - 1].m_Point, FXPT_TYPE::LineTo, |
| false); |
| } |
| if (!bZeroArea) { |
| NewPath->Append(&t_path, nullptr); |
| *bThin = true; |
| return true; |
| } |
| } |
| |
| int startPoint = 0; |
| for (size_t i = 0; i < m_Points.size(); i++) { |
| FXPT_TYPE point_type = m_Points[i].m_Type; |
| if (point_type == FXPT_TYPE::MoveTo) { |
| startPoint = i; |
| continue; |
| } |
| |
| if (point_type == FXPT_TYPE::BezierTo) { |
| i += 2; |
| continue; |
| } |
| |
| ASSERT(point_type == FXPT_TYPE::LineTo); |
| int next_index = |
| (i + 1 - startPoint) % (m_Points.size() - startPoint) + startPoint; |
| const FX_PATHPOINT& next = m_Points[next_index]; |
| if (next.m_Type == FXPT_TYPE::BezierTo || next.m_Type == FXPT_TYPE::MoveTo) |
| continue; |
| |
| const FX_PATHPOINT& prev = m_Points[i - 1]; |
| const FX_PATHPOINT& cur = m_Points[i]; |
| if (IsFoldingVerticalLine(prev.m_Point, cur.m_Point, next.m_Point)) { |
| bool use_prev = fabs(cur.m_Point.y - prev.m_Point.y) < |
| fabs(cur.m_Point.y - next.m_Point.y); |
| const FX_PATHPOINT& start = use_prev ? prev : cur; |
| const FX_PATHPOINT& end = use_prev ? m_Points[next_index - 1] : next; |
| NewPath->AppendPoint(start.m_Point, FXPT_TYPE::MoveTo, false); |
| NewPath->AppendPoint(end.m_Point, FXPT_TYPE::LineTo, false); |
| } else if (IsFoldingHorizontalLine(prev.m_Point, cur.m_Point, |
| next.m_Point)) { |
| bool use_prev = fabs(cur.m_Point.x - prev.m_Point.x) < |
| fabs(cur.m_Point.x - next.m_Point.x); |
| const FX_PATHPOINT& start = use_prev ? prev : cur; |
| const FX_PATHPOINT& end = use_prev ? m_Points[next_index - 1] : next; |
| NewPath->AppendPoint(start.m_Point, FXPT_TYPE::MoveTo, false); |
| NewPath->AppendPoint(end.m_Point, FXPT_TYPE::LineTo, false); |
| } else if (IsClosedFigure(prev, next)) { |
| NewPath->AppendPoint(prev.m_Point, FXPT_TYPE::MoveTo, false); |
| NewPath->AppendPoint(cur.m_Point, FXPT_TYPE::LineTo, false); |
| *bThin = true; |
| } |
| } |
| |
| size_t new_path_size = NewPath->GetPoints().size(); |
| if (m_Points.size() > 3 && new_path_size > 0) |
| *bThin = true; |
| return new_path_size != 0; |
| } |
| |
| bool CFX_PathData::IsRect() const { |
| if (m_Points.size() != 5 && m_Points.size() != 4) |
| return false; |
| |
| if ((m_Points.size() == 5 && m_Points[0].m_Point != m_Points[4].m_Point) || |
| m_Points[0].m_Point == m_Points[2].m_Point || |
| m_Points[1].m_Point == m_Points[3].m_Point) { |
| return false; |
| } |
| // Note, both x,y have to not equal. |
| if (m_Points[0].m_Point.x != m_Points[3].m_Point.x && |
| m_Points[0].m_Point.y != m_Points[3].m_Point.y) { |
| return false; |
| } |
| |
| for (int i = 1; i < 4; i++) { |
| if (m_Points[i].m_Type != FXPT_TYPE::LineTo) |
| return false; |
| // Note, both x,y have to not equal. |
| if (m_Points[i].m_Point.x != m_Points[i - 1].m_Point.x && |
| m_Points[i].m_Point.y != m_Points[i - 1].m_Point.y) { |
| return false; |
| } |
| } |
| return m_Points.size() == 5 || m_Points[3].m_CloseFigure; |
| } |
| |
| bool CFX_PathData::IsRect(const CFX_Matrix* pMatrix, |
| CFX_FloatRect* pRect) const { |
| if (!pMatrix) { |
| if (!IsRect()) |
| return false; |
| |
| if (pRect) { |
| pRect->left = m_Points[0].m_Point.x; |
| pRect->right = m_Points[2].m_Point.x; |
| pRect->bottom = m_Points[0].m_Point.y; |
| pRect->top = m_Points[2].m_Point.y; |
| pRect->Normalize(); |
| } |
| return true; |
| } |
| |
| if (m_Points.size() != 5 && m_Points.size() != 4) |
| return false; |
| |
| if ((m_Points.size() == 5 && m_Points[0].m_Point != m_Points[4].m_Point) || |
| m_Points[1].m_Point == m_Points[3].m_Point) { |
| return false; |
| } |
| // Note, both x,y not equal. |
| if (m_Points.size() == 4 && m_Points[0].m_Point.x != m_Points[3].m_Point.x && |
| m_Points[0].m_Point.y != m_Points[3].m_Point.y) { |
| return false; |
| } |
| |
| CFX_PointF points[5]; |
| for (size_t i = 0; i < m_Points.size(); i++) { |
| points[i] = pMatrix->Transform(m_Points[i].m_Point); |
| |
| if (i == 0) |
| continue; |
| if (m_Points[i].m_Type != FXPT_TYPE::LineTo) |
| return false; |
| if (points[i].x != points[i - 1].x && points[i].y != points[i - 1].y) |
| return false; |
| } |
| |
| if (pRect) { |
| pRect->left = points[0].x; |
| pRect->right = points[2].x; |
| pRect->bottom = points[0].y; |
| pRect->top = points[2].y; |
| pRect->Normalize(); |
| } |
| return true; |
| } |
| |
| CFX_RetainablePathData::CFX_RetainablePathData() = default; |
| |
| // Note: can't default the copy constructor since Retainable<> has a deleted |
| // copy constructor (as it should). Instead, we want the default Retainable<> |
| // constructor to be invoked so as to create a copy with a ref-count of 1 as |
| // of the time it is created, then populate the remainder of the members from |
| // the |src| object. |
| CFX_RetainablePathData::CFX_RetainablePathData( |
| const CFX_RetainablePathData& src) |
| : CFX_PathData(src) {} |
| |
| CFX_RetainablePathData::~CFX_RetainablePathData() = default; |
| |
| RetainPtr<CFX_RetainablePathData> CFX_RetainablePathData::Clone() const { |
| return pdfium::MakeRetain<CFX_RetainablePathData>(*this); |
| } |
