| // 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" |
| |
| CFX_PathData::CFX_PathData() {} |
| |
| CFX_PathData::~CFX_PathData() {} |
| |
| CFX_PathData::CFX_PathData(const CFX_PathData& src) : m_Points(src.m_Points) {} |
| |
| 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++) |
| pMatrix->TransformPoint(m_Points[i].m_PointX, m_Points[i].m_PointY); |
| } |
| |
| void CFX_PathData::AppendPoint(FX_FLOAT x, |
| FX_FLOAT y, |
| FXPT_TYPE type, |
| bool closeFigure) { |
| m_Points.push_back({x, y, type, closeFigure}); |
| } |
| |
| void CFX_PathData::AppendRect(FX_FLOAT left, |
| FX_FLOAT bottom, |
| FX_FLOAT right, |
| FX_FLOAT top) { |
| m_Points.push_back({left, bottom, FXPT_TYPE::MoveTo, false}); |
| m_Points.push_back({left, top, FXPT_TYPE::LineTo, false}); |
| m_Points.push_back({right, top, FXPT_TYPE::LineTo, false}); |
| m_Points.push_back({right, bottom, FXPT_TYPE::LineTo, false}); |
| m_Points.push_back({left, bottom, FXPT_TYPE::LineTo, true}); |
| } |
| |
| CFX_FloatRect CFX_PathData::GetBoundingBox() const { |
| if (m_Points.empty()) |
| return CFX_FloatRect(); |
| |
| CFX_FloatRect rect; |
| rect.InitRect(m_Points[0].m_PointX, m_Points[0].m_PointY); |
| for (size_t i = 1; i < m_Points.size(); i++) |
| rect.UpdateRect(m_Points[i].m_PointX, m_Points[i].m_PointY); |
| return rect; |
| } |
| |
| static void _UpdateLineEndPoints(CFX_FloatRect& rect, |
| FX_FLOAT start_x, |
| FX_FLOAT start_y, |
| FX_FLOAT end_x, |
| FX_FLOAT end_y, |
| FX_FLOAT hw) { |
| if (start_x == end_x) { |
| if (start_y == end_y) { |
| rect.UpdateRect(end_x + hw, end_y + hw); |
| rect.UpdateRect(end_x - hw, end_y - hw); |
| return; |
| } |
| FX_FLOAT point_y; |
| if (end_y < start_y) { |
| point_y = end_y - hw; |
| } else { |
| point_y = end_y + hw; |
| } |
| rect.UpdateRect(end_x + hw, point_y); |
| rect.UpdateRect(end_x - hw, point_y); |
| return; |
| } |
| if (start_y == end_y) { |
| FX_FLOAT point_x; |
| if (end_x < start_x) { |
| point_x = end_x - hw; |
| } else { |
| point_x = end_x + hw; |
| } |
| rect.UpdateRect(point_x, end_y + hw); |
| rect.UpdateRect(point_x, end_y - hw); |
| return; |
| } |
| FX_FLOAT dx = end_x - start_x; |
| FX_FLOAT dy = end_y - start_y; |
| FX_FLOAT ll = FXSYS_sqrt2(dx, dy); |
| FX_FLOAT mx = end_x + hw * dx / ll; |
| FX_FLOAT my = end_y + hw * dy / ll; |
| FX_FLOAT dx1 = hw * dy / ll; |
| FX_FLOAT dy1 = hw * dx / ll; |
| rect.UpdateRect(mx - dx1, my + dy1); |
| rect.UpdateRect(mx + dx1, my - dy1); |
| } |
| |
| static void _UpdateLineJoinPoints(CFX_FloatRect& rect, |
| FX_FLOAT start_x, |
| FX_FLOAT start_y, |
| FX_FLOAT middle_x, |
| FX_FLOAT middle_y, |
| FX_FLOAT end_x, |
| FX_FLOAT end_y, |
| FX_FLOAT half_width, |
| FX_FLOAT miter_limit) { |
| FX_FLOAT start_k = 0, start_c = 0, end_k = 0, end_c = 0, start_len = 0, |
| start_dc = 0, end_len = 0, end_dc = 0; |
| bool bStartVert = FXSYS_fabs(start_x - middle_x) < 1.0f / 20; |
| bool bEndVert = FXSYS_fabs(middle_x - end_x) < 1.0f / 20; |
| if (bStartVert && bEndVert) { |
| int start_dir = middle_y > start_y ? 1 : -1; |
| FX_FLOAT point_y = middle_y + half_width * start_dir; |
| rect.UpdateRect(middle_x + half_width, point_y); |
| rect.UpdateRect(middle_x - half_width, point_y); |
| return; |
| } |
| if (!bStartVert) { |
| start_k = (middle_y - start_y) / (middle_x - start_x); |
| start_c = middle_y - (start_k * middle_x); |
| start_len = FXSYS_sqrt2(start_x - middle_x, start_y - middle_y); |
| start_dc = |
| (FX_FLOAT)FXSYS_fabs(half_width * start_len / (start_x - middle_x)); |
| } |
| if (!bEndVert) { |
| end_k = (end_y - middle_y) / (end_x - middle_x); |
| end_c = middle_y - (end_k * middle_x); |
| end_len = FXSYS_sqrt2(end_x - middle_x, end_y - middle_y); |
| end_dc = (FX_FLOAT)FXSYS_fabs(half_width * end_len / (end_x - middle_x)); |
| } |
| if (bStartVert) { |
| FX_FLOAT outside_x = start_x; |
| if (end_x < start_x) { |
| outside_x += half_width; |
| } else { |
| outside_x -= half_width; |
| } |
| FX_FLOAT outside_y; |
| if (start_y < (end_k * start_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_x, outside_y); |
| return; |
| } |
| if (bEndVert) { |
| FX_FLOAT outside_x = end_x; |
| if (start_x < end_x) { |
| outside_x += half_width; |
| } else { |
| outside_x -= half_width; |
| } |
| FX_FLOAT outside_y; |
| if (end_y < (start_k * end_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_x, outside_y); |
| return; |
| } |
| if (FXSYS_fabs(start_k - end_k) < 1.0f / 20) { |
| int start_dir = middle_x > start_x ? 1 : -1; |
| int end_dir = end_x > middle_x ? 1 : -1; |
| if (start_dir == end_dir) { |
| _UpdateLineEndPoints(rect, middle_x, middle_y, end_x, end_y, half_width); |
| } else { |
| _UpdateLineEndPoints(rect, start_x, start_y, middle_x, middle_y, |
| half_width); |
| } |
| return; |
| } |
| FX_FLOAT start_outside_c = start_c; |
| if (end_y < (start_k * end_x) + start_c) { |
| start_outside_c += start_dc; |
| } else { |
| start_outside_c -= start_dc; |
| } |
| FX_FLOAT end_outside_c = end_c; |
| if (start_y < (end_k * start_x) + end_c) { |
| end_outside_c += end_dc; |
| } else { |
| end_outside_c -= end_dc; |
| } |
| FX_FLOAT join_x = (end_outside_c - start_outside_c) / (start_k - end_k); |
| FX_FLOAT join_y = (start_k * join_x) + start_outside_c; |
| rect.UpdateRect(join_x, join_y); |
| } |
| |
| CFX_FloatRect CFX_PathData::GetBoundingBox(FX_FLOAT line_width, |
| FX_FLOAT miter_limit) const { |
| CFX_FloatRect rect(100000 * 1.0f, 100000 * 1.0f, -100000 * 1.0f, |
| -100000 * 1.0f); |
| size_t iPoint = 0; |
| FX_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)) { |
| iStartPoint = iPoint + 1; |
| iEndPoint = iPoint; |
| bJoin = false; |
| } else { |
| if (m_Points[iPoint].IsTypeAndOpen(FXPT_TYPE::BezierTo)) { |
| rect.UpdateRect(m_Points[iPoint].m_PointX, m_Points[iPoint].m_PointY); |
| rect.UpdateRect(m_Points[iPoint + 1].m_PointX, |
| m_Points[iPoint + 1].m_PointY); |
| 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; |
| } |
| } |
| FX_FLOAT start_x = m_Points[iStartPoint].m_PointX; |
| FX_FLOAT start_y = m_Points[iStartPoint].m_PointY; |
| FX_FLOAT end_x = m_Points[iEndPoint].m_PointX; |
| FX_FLOAT end_y = m_Points[iEndPoint].m_PointY; |
| if (bJoin) { |
| FX_FLOAT middle_x = m_Points[iMiddlePoint].m_PointX; |
| FX_FLOAT middle_y = m_Points[iMiddlePoint].m_PointY; |
| _UpdateLineJoinPoints(rect, start_x, start_y, middle_x, middle_y, end_x, |
| end_y, half_width, miter_limit); |
| } else { |
| _UpdateLineEndPoints(rect, start_x, start_y, end_x, end_y, half_width); |
| } |
| iPoint++; |
| } |
| return rect; |
| } |
| |
| void CFX_PathData::Transform(const CFX_Matrix* pMatrix) { |
| if (!pMatrix) |
| return; |
| for (auto& point : m_Points) |
| pMatrix->TransformPoint(point.m_PointX, point.m_PointY); |
| } |
| |
| 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_PointX == m_Points[2].m_PointX && |
| m_Points[0].m_PointY == m_Points[2].m_PointY) { |
| for (size_t i = 0; i < 2; i++) { |
| FX_FLOAT x = m_Points[i].m_PointX; |
| FX_FLOAT y = m_Points[i].m_PointY; |
| if (bAdjust) { |
| if (pMatrix) |
| pMatrix->TransformPoint(x, y); |
| |
| x = static_cast<int>(x) + 0.5f; |
| y = static_cast<int>(y) + 0.5f; |
| } |
| NewPath->AppendPoint(x, y, i == 0 ? FXPT_TYPE::MoveTo : FXPT_TYPE::LineTo, |
| false); |
| } |
| if (bAdjust && pMatrix) |
| *setIdentity = true; |
| |
| if (m_Points[0].m_PointX != m_Points[1].m_PointX && |
| m_Points[0].m_PointY != m_Points[1].m_PointY) { |
| *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_PointX == m_Points[mid + i + 1].m_PointX && |
| m_Points[mid - i - 1].m_PointY == m_Points[mid + i + 1].m_PointY && |
| 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_PointX, m_Points[mid - i].m_PointY, |
| FXPT_TYPE::MoveTo, false); |
| t_path.AppendPoint(m_Points[mid - i - 1].m_PointX, |
| m_Points[mid - i - 1].m_PointY, FXPT_TYPE::LineTo, |
| false); |
| } |
| if (!bZeroArea) { |
| NewPath->Append(&t_path, nullptr); |
| *bThin = true; |
| return true; |
| } |
| } |
| |
| int stratPoint = 0; |
| int next = 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) { |
| stratPoint = i; |
| } else if (point_type == FXPT_TYPE::LineTo) { |
| next = (i + 1 - stratPoint) % (m_Points.size() - stratPoint) + stratPoint; |
| if (m_Points[next].m_Type != FXPT_TYPE::BezierTo && |
| m_Points[next].m_Type != FXPT_TYPE::MoveTo) { |
| if ((m_Points[i - 1].m_PointX == m_Points[i].m_PointX && |
| m_Points[i].m_PointX == m_Points[next].m_PointX) && |
| ((m_Points[i].m_PointY - m_Points[i - 1].m_PointY) * |
| (m_Points[i].m_PointY - m_Points[next].m_PointY) > |
| 0)) { |
| int pre = i; |
| if (FXSYS_fabs(m_Points[i].m_PointY - m_Points[i - 1].m_PointY) < |
| FXSYS_fabs(m_Points[i].m_PointY - m_Points[next].m_PointY)) { |
| pre--; |
| next--; |
| } |
| |
| NewPath->AppendPoint(m_Points[pre].m_PointX, m_Points[pre].m_PointY, |
| FXPT_TYPE::MoveTo, false); |
| NewPath->AppendPoint(m_Points[next].m_PointX, m_Points[next].m_PointY, |
| FXPT_TYPE::LineTo, false); |
| } else if ((m_Points[i - 1].m_PointY == m_Points[i].m_PointY && |
| m_Points[i].m_PointY == m_Points[next].m_PointY) && |
| ((m_Points[i].m_PointX - m_Points[i - 1].m_PointX) * |
| (m_Points[i].m_PointX - m_Points[next].m_PointX) > |
| 0)) { |
| int pre = i; |
| if (FXSYS_fabs(m_Points[i].m_PointX - m_Points[i - 1].m_PointX) < |
| FXSYS_fabs(m_Points[i].m_PointX - m_Points[next].m_PointX)) { |
| pre--; |
| next--; |
| } |
| |
| NewPath->AppendPoint(m_Points[pre].m_PointX, m_Points[pre].m_PointY, |
| FXPT_TYPE::MoveTo, false); |
| NewPath->AppendPoint(m_Points[next].m_PointX, m_Points[next].m_PointY, |
| FXPT_TYPE::LineTo, false); |
| } else if (m_Points[i - 1].m_Type == FXPT_TYPE::MoveTo && |
| m_Points[next].m_Type == FXPT_TYPE::LineTo && |
| m_Points[i - 1].m_PointX == m_Points[next].m_PointX && |
| m_Points[i - 1].m_PointY == m_Points[next].m_PointY && |
| m_Points[next].m_CloseFigure) { |
| NewPath->AppendPoint(m_Points[i - 1].m_PointX, |
| m_Points[i - 1].m_PointY, FXPT_TYPE::MoveTo, |
| false); |
| NewPath->AppendPoint(m_Points[i].m_PointX, m_Points[i].m_PointY, |
| FXPT_TYPE::LineTo, false); |
| *bThin = true; |
| } |
| } |
| } else if (point_type == FXPT_TYPE::BezierTo) { |
| i += 2; |
| continue; |
| } |
| } |
| |
| 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_PointX != m_Points[4].m_PointX || |
| m_Points[0].m_PointY != m_Points[4].m_PointY)) || |
| (m_Points[0].m_PointX == m_Points[2].m_PointX && |
| m_Points[0].m_PointY == m_Points[2].m_PointY) || |
| (m_Points[1].m_PointX == m_Points[3].m_PointX && |
| m_Points[1].m_PointY == m_Points[3].m_PointY)) { |
| return false; |
| } |
| if (m_Points[0].m_PointX != m_Points[3].m_PointX && |
| m_Points[0].m_PointY != m_Points[3].m_PointY) { |
| return false; |
| } |
| for (int i = 1; i < 4; i++) { |
| if (m_Points[i].m_Type != FXPT_TYPE::LineTo) |
| return false; |
| if (m_Points[i].m_PointX != m_Points[i - 1].m_PointX && |
| m_Points[i].m_PointY != m_Points[i - 1].m_PointY) { |
| 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_PointX; |
| pRect->right = m_Points[2].m_PointX; |
| pRect->bottom = m_Points[0].m_PointY; |
| pRect->top = m_Points[2].m_PointY; |
| pRect->Normalize(); |
| } |
| return true; |
| } |
| |
| if (m_Points.size() != 5 && m_Points.size() != 4) |
| return false; |
| |
| if ((m_Points.size() == 5 && |
| (m_Points[0].m_PointX != m_Points[4].m_PointX || |
| m_Points[0].m_PointY != m_Points[4].m_PointY)) || |
| (m_Points[1].m_PointX == m_Points[3].m_PointX && |
| m_Points[1].m_PointY == m_Points[3].m_PointY)) { |
| return false; |
| } |
| if (m_Points.size() == 4 && m_Points[0].m_PointX != m_Points[3].m_PointX && |
| m_Points[0].m_PointY != m_Points[3].m_PointY) { |
| return false; |
| } |
| |
| FX_FLOAT x[5]; |
| FX_FLOAT y[5]; |
| for (size_t i = 0; i < m_Points.size(); i++) { |
| x[i] = m_Points[i].m_PointX; |
| y[i] = m_Points[i].m_PointY; |
| pMatrix->TransformPoint(x[i], y[i]); |
| |
| if (i == 0) |
| continue; |
| if (m_Points[i].m_Type != FXPT_TYPE::LineTo) |
| return false; |
| if (x[i] != x[i - 1] && y[i] != y[i - 1]) |
| return false; |
| } |
| |
| if (pRect) { |
| pRect->left = x[0]; |
| pRect->right = x[2]; |
| pRect->bottom = y[0]; |
| pRect->top = y[2]; |
| pRect->Normalize(); |
| } |
| return true; |
| } |
