Move core/fxge/ge to core/fxge.

This brings the cpp and h files together and removes the
redundant ge/ path.

Change-Id: I36594b8ae719d362768ba4c2e4ce173e287363eb
Reviewed-on: https://pdfium-review.googlesource.com/7452
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

1 files changed, 487 insertions, 0 deletions

diff --git a/core/fxge/cfx_pathdata.cpp b/core/fxge/cfx_pathdata.cpp
new file mode 100644
index 0000000000..fe3c6778d5
--- /dev/null
+++ b/core/fxge/cfx_pathdata.cpp
@@ -0,0 +1,487 @@
+// 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 {
+
+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.x + hw, end_pos.y + hw);
+      rect->UpdateRect(end_pos.x - hw, end_pos.y - 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(end_pos.x + hw, point_y);
+    rect->UpdateRect(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(point_x, end_pos.y + hw);
+    rect->UpdateRect(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(mx - dx1, my + dy1);
+  rect->UpdateRect(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(mid_pos.x + half_width, point_y);
+    rect->UpdateRect(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.x, outside.y);
+    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.x, outside.y);
+    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(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() {}
+
+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++)
+    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::AppendRect(float left,
+                              float bottom,
+                              float right,
+                              float top) {
+  m_Points.push_back(
+      FX_PATHPOINT(CFX_PointF(left, bottom), FXPT_TYPE::MoveTo, false));
+  m_Points.push_back(
+      FX_PATHPOINT(CFX_PointF(left, top), FXPT_TYPE::LineTo, false));
+  m_Points.push_back(
+      FX_PATHPOINT(CFX_PointF(right, top), FXPT_TYPE::LineTo, false));
+  m_Points.push_back(
+      FX_PATHPOINT(CFX_PointF(right, bottom), FXPT_TYPE::LineTo, false));
+  m_Points.push_back(
+      FX_PATHPOINT(CFX_PointF(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_Point.x, m_Points[0].m_Point.y);
+  for (size_t i = 1; i < m_Points.size(); i++)
+    rect.UpdateRect(m_Points[i].m_Point.x, m_Points[i].m_Point.y);
+  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.x, m_Points[iPoint].m_Point.y);
+        rect.UpdateRect(m_Points[iPoint + 1].m_Point.x,
+                        m_Points[iPoint + 1].m_Point.y);
+        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* pMatrix) {
+  if (!pMatrix)
+    return;
+  for (auto& point : m_Points)
+    point.m_Point = pMatrix->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;
+  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) {
+      startPoint = i;
+    } else if (point_type == FXPT_TYPE::LineTo) {
+      next = (i + 1 - startPoint) % (m_Points.size() - startPoint) + startPoint;
+      if (m_Points[next].m_Type != FXPT_TYPE::BezierTo &&
+          m_Points[next].m_Type != FXPT_TYPE::MoveTo) {
+        if ((m_Points[i - 1].m_Point.x == m_Points[i].m_Point.x &&
+             m_Points[i].m_Point.x == m_Points[next].m_Point.x) &&
+            ((m_Points[i].m_Point.y - m_Points[i - 1].m_Point.y) *
+                 (m_Points[i].m_Point.y - m_Points[next].m_Point.y) >
+             0)) {
+          int pre = i;
+          if (fabs(m_Points[i].m_Point.y - m_Points[i - 1].m_Point.y) <
+              fabs(m_Points[i].m_Point.y - m_Points[next].m_Point.y)) {
+            pre--;
+            next--;
+          }
+
+          NewPath->AppendPoint(m_Points[pre].m_Point, FXPT_TYPE::MoveTo, false);
+          NewPath->AppendPoint(m_Points[next].m_Point, FXPT_TYPE::LineTo,
+                               false);
+        } else if ((m_Points[i - 1].m_Point.y == m_Points[i].m_Point.y &&
+                    m_Points[i].m_Point.y == m_Points[next].m_Point.y) &&
+                   ((m_Points[i].m_Point.x - m_Points[i - 1].m_Point.x) *
+                        (m_Points[i].m_Point.x - m_Points[next].m_Point.x) >
+                    0)) {
+          int pre = i;
+          if (fabs(m_Points[i].m_Point.x - m_Points[i - 1].m_Point.x) <
+              fabs(m_Points[i].m_Point.x - m_Points[next].m_Point.x)) {
+            pre--;
+            next--;
+          }
+
+          NewPath->AppendPoint(m_Points[pre].m_Point, FXPT_TYPE::MoveTo, false);
+          NewPath->AppendPoint(m_Points[next].m_Point, 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_Point == m_Points[next].m_Point &&
+                   m_Points[next].m_CloseFigure) {
+          NewPath->AppendPoint(m_Points[i - 1].m_Point, FXPT_TYPE::MoveTo,
+                               false);
+          NewPath->AppendPoint(m_Points[i].m_Point, 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_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;
+}