Fixup naming of XFA graphics classes

These files were originally renamed thinking they'd move with the
colour class up to core/. It was decided that CPWL_Color was a better
core colour class the the xfa colour so these are being renamed back to
XFA based names to make it clear where they live.

Change-Id: Ie89f2306be0609add29bd445e719567e7b439211
Reviewed-on: https://pdfium-review.googlesource.com/7754
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/xfa/fxgraphics/cxfa_path.cpp b/xfa/fxgraphics/cxfa_path.cpp
new file mode 100644
index 0000000000..6d7ed0be58
--- /dev/null
+++ b/xfa/fxgraphics/cxfa_path.cpp
@@ -0,0 +1,148 @@
+// 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_path.h"
+
+#include "core/fxge/cfx_pathdata.h"
+#include "third_party/base/ptr_util.h"
+
+CXFA_Path::CXFA_Path() {}
+
+CXFA_Path::~CXFA_Path() {}
+
+void CXFA_Path::Clear() {
+  data_.Clear();
+}
+
+void CXFA_Path::Close() {
+  data_.ClosePath();
+}
+
+void CXFA_Path::MoveTo(const CFX_PointF& point) {
+  data_.AppendPoint(point, FXPT_TYPE::MoveTo, false);
+}
+
+void CXFA_Path::LineTo(const CFX_PointF& point) {
+  data_.AppendPoint(point, FXPT_TYPE::LineTo, false);
+}
+
+void CXFA_Path::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_Path::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_Path::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_Path::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_Path::AddRectangle(float left, float top, float width, float height) {
+  data_.AppendRect(left, top, left + width, top + height);
+}
+
+void CXFA_Path::AddEllipse(const CFX_RectF& rect) {
+  AddArc(rect.TopLeft(), rect.Size(), 0, FX_PI * 2);
+}
+
+void CXFA_Path::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_Path::AddSubpath(CXFA_Path* path) {
+  if (!path)
+    return;
+  data_.Append(&path->data_, nullptr);
+}
+
+void CXFA_Path::TransformBy(const CFX_Matrix& mt) {
+  data_.Transform(&mt);
+}