1 files changed, 151 insertions, 0 deletions
diff --git a/xfa/fxgraphics/cxfa_gepath.cpp b/xfa/fxgraphics/cxfa_gepath.cpp
new file mode 100644
index 0000000000..88372f72ac
--- /dev/null
+++ b/xfa/fxgraphics/cxfa_gepath.cpp
@@ -0,0 +1,151 @@
+// 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 "xfa/fxgraphics/cxfa_gepath.h"
+
+#include "core/fxge/cfx_pathdata.h"
+#include "third_party/base/ptr_util.h"
+
+CXFA_GEPath::CXFA_GEPath() {}
+
+CXFA_GEPath::~CXFA_GEPath() {}
+
+void CXFA_GEPath::Clear() {
+  data_.Clear();
+}
+
+void CXFA_GEPath::Close() {
+  data_.ClosePath();
+}
+
+void CXFA_GEPath::MoveTo(const CFX_PointF& point) {
+  data_.AppendPoint(point, FXPT_TYPE::MoveTo, false);
+}
+
+void CXFA_GEPath::LineTo(const CFX_PointF& point) {
+  data_.AppendPoint(point, FXPT_TYPE::LineTo, false);
+}
+
+void CXFA_GEPath::BezierTo(const CFX_PointF& c1,
+                           const CFX_PointF& c2,
+                           const CFX_PointF& to) {
+  data_.AppendPoint(c1, FXPT_TYPE::BezierTo, false);
+  data_.AppendPoint(c2, FXPT_TYPE::BezierTo, false);
+  data_.AppendPoint(to, FXPT_TYPE::BezierTo, false);
+}
+
+void CXFA_GEPath::ArcTo(const CFX_PointF& pos,
+                        const CFX_SizeF& size,
+                        float start_angle,
+                        float sweep_angle) {
+  CFX_SizeF new_size = size / 2.0f;
+  ArcToInternal(CFX_PointF(pos.x + new_size.width, pos.y + new_size.height),
+                new_size, start_angle, sweep_angle);
+}
+
+void CXFA_GEPath::ArcToInternal(const CFX_PointF& pos,
+                                const CFX_SizeF& size,
+                                float start_angle,
+                                float sweep_angle) {
+  float x0 = cos(sweep_angle / 2);
+  float y0 = sin(sweep_angle / 2);
+  float tx = ((1.0f - x0) * 4) / (3 * 1.0f);
+  float ty = y0 - ((tx * x0) / y0);
+
+  CFX_PointF points[] = {CFX_PointF(x0 + tx, -ty), CFX_PointF(x0 + tx, ty)};
+  float sn = sin(start_angle + sweep_angle / 2);
+  float cs = cos(start_angle + sweep_angle / 2);
+
+  CFX_PointF bezier;
+  bezier.x = pos.x + (size.width * ((points[0].x * cs) - (points[0].y * sn)));
+  bezier.y = pos.y + (size.height * ((points[0].x * sn) + (points[0].y * cs)));
+  data_.AppendPoint(bezier, FXPT_TYPE::BezierTo, false);
+
+  bezier.x = pos.x + (size.width * ((points[1].x * cs) - (points[1].y * sn)));
+  bezier.y = pos.y + (size.height * ((points[1].x * sn) + (points[1].y * cs)));
+  data_.AppendPoint(bezier, FXPT_TYPE::BezierTo, false);
+
+  bezier.x = pos.x + (size.width * cos(start_angle + sweep_angle));
+  bezier.y = pos.y + (size.height * sin(start_angle + sweep_angle));
+  data_.AppendPoint(bezier, FXPT_TYPE::BezierTo, false);
+}
+
+void CXFA_GEPath::AddLine(const CFX_PointF& p1, const CFX_PointF& p2) {
+  data_.AppendPoint(p1, FXPT_TYPE::MoveTo, false);
+  data_.AppendPoint(p2, FXPT_TYPE::LineTo, false);
+}
+
+void CXFA_GEPath::AddRectangle(float left,
+                               float top,
+                               float width,
+                               float height) {
+  data_.AppendRect(left, top, left + width, top + height);
+}
+
+void CXFA_GEPath::AddEllipse(const CFX_RectF& rect) {
+  AddArc(rect.TopLeft(), rect.Size(), 0, FX_PI * 2);
+}
+
+void CXFA_GEPath::AddArc(const CFX_PointF& original_pos,
+                         const CFX_SizeF& original_size,
+                         float start_angle,
+                         float sweep_angle) {
+  if (sweep_angle == 0)
+    return;
+
+  const float bezier_arc_angle_epsilon = 0.01f;
+  while (start_angle > FX_PI * 2)
+    start_angle -= FX_PI * 2;
+  while (start_angle < 0)
+    start_angle += FX_PI * 2;
+  if (sweep_angle >= FX_PI * 2)
+    sweep_angle = FX_PI * 2;
+  if (sweep_angle <= -FX_PI * 2)
+    sweep_angle = -FX_PI * 2;
+
+  CFX_SizeF size = original_size / 2;
+  CFX_PointF pos(original_pos.x + size.width, original_pos.y + size.height);
+  data_.AppendPoint(pos + CFX_PointF(size.width * cos(start_angle),
+                                     size.height * sin(start_angle)),
+                    FXPT_TYPE::MoveTo, false);
+
+  float total_sweep = 0;
+  float local_sweep = 0;
+  float prev_sweep = 0;
+  bool done = false;
+  do {
+    if (sweep_angle < 0) {
+      prev_sweep = total_sweep;
+      local_sweep = -FX_PI / 2;
+      total_sweep -= FX_PI / 2;
+      if (total_sweep <= sweep_angle + bezier_arc_angle_epsilon) {
+        local_sweep = sweep_angle - prev_sweep;
+        done = true;
+      }
+    } else {
+      prev_sweep = total_sweep;
+      local_sweep = FX_PI / 2;
+      total_sweep += FX_PI / 2;
+      if (total_sweep >= sweep_angle - bezier_arc_angle_epsilon) {
+        local_sweep = sweep_angle - prev_sweep;
+        done = true;
+      }
+    }
+
+    ArcToInternal(pos, size, start_angle, local_sweep);
+    start_angle += local_sweep;
+  } while (!done);
+}
+
+void CXFA_GEPath::AddSubpath(CXFA_GEPath* path) {
+  if (!path)
+    return;
+  data_.Append(&path->data_, nullptr);
+}
+
+void CXFA_GEPath::TransformBy(const CFX_Matrix& mt) {
+  data_.Transform(&mt);
+}