feat: godot-engine-source-4.3-stable

engine/thirdparty/clipper2/include/clipper2/clipper.rectclip.h

@@ -0,0 +1,81 @@
+/*******************************************************************************
+* Author    :  Angus Johnson                                                   *
+* Date      :  1 November 2023                                                 *
+* Website   :  http://www.angusj.com                                           *
+* Copyright :  Angus Johnson 2010-2023                                         *
+* Purpose   :  FAST rectangular clipping                                       *
+* License   :  http://www.boost.org/LICENSE_1_0.txt                            *
+*******************************************************************************/
+
+#ifndef CLIPPER_RECTCLIP_H
+#define CLIPPER_RECTCLIP_H
+
+#include <cstdlib>
+#include <vector>
+#include <queue>
+#include "clipper2/clipper.core.h"
+
+namespace Clipper2Lib
+{
+
+  enum class Location { Left, Top, Right, Bottom, Inside };
+
+  class OutPt2;
+  typedef std::vector<OutPt2*> OutPt2List;
+
+  class OutPt2 {
+  public:
+    Point64 pt;
+    size_t owner_idx;
+    OutPt2List* edge;
+    OutPt2* next;
+    OutPt2* prev;
+  };
+
+  //------------------------------------------------------------------------------
+  // RectClip64
+  //------------------------------------------------------------------------------
+
+  class RectClip64 {
+  private:
+    void ExecuteInternal(const Path64& path);
+    Path64 GetPath(OutPt2*& op);
+  protected:
+    const Rect64 rect_;
+    const Path64 rect_as_path_;
+    const Point64 rect_mp_;
+    Rect64 path_bounds_;
+    std::deque<OutPt2> op_container_;
+    OutPt2List results_;  // each path can be broken into multiples
+    OutPt2List edges_[8]; // clockwise and counter-clockwise
+    std::vector<Location> start_locs_;
+    void CheckEdges();
+    void TidyEdges(int idx, OutPt2List& cw, OutPt2List& ccw);
+    void GetNextLocation(const Path64& path,
+      Location& loc, int& i, int highI);
+    OutPt2* Add(Point64 pt, bool start_new = false);
+    void AddCorner(Location prev, Location curr);
+    void AddCorner(Location& loc, bool isClockwise);
+  public:
+    explicit RectClip64(const Rect64& rect) :
+      rect_(rect),
+      rect_as_path_(rect.AsPath()),
+      rect_mp_(rect.MidPoint()) {}
+    Paths64 Execute(const Paths64& paths);
+  };
+
+  //------------------------------------------------------------------------------
+  // RectClipLines64
+  //------------------------------------------------------------------------------
+
+  class RectClipLines64 : public RectClip64 {
+  private:
+    void ExecuteInternal(const Path64& path);
+    Path64 GetPath(OutPt2*& op);
+  public:
+    explicit RectClipLines64(const Rect64& rect) : RectClip64(rect) {};
+    Paths64 Execute(const Paths64& paths);
+  };
+
+} // Clipper2Lib namespace
+#endif  // CLIPPER_RECTCLIP_H