text: /******************************************************************************
   * Spine Runtimes License Agreement
   * Last updated January 1, 2020. Replaces all prior versions.
   *
   * Copyright (c) 2013-2020, Esoteric Software LLC
   *
   * Integration of the Spine Runtimes into software or otherwise creating
   * derivative works of the Spine Runtimes is permitted under the terms and
   * conditions of Section 2 of the Spine Editor License Agreement:
   * http://esotericsoftware.com/spine-editor-license
   *
   * Otherwise, it is permitted to integrate the Spine Runtimes into software
   * or otherwise create derivative works of the Spine Runtimes (collectively,
   * "Products"), provided that each user of the Products must obtain their own
   * Spine Editor license and redistribution of the Products in any form must
   * include this license and copyright notice.
   *
   * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
   * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *****************************************************************************/
  
  #ifndef Spine_SkeletonClipping_h
  #define Spine_SkeletonClipping_h
  
  #include "spine/Vector.h"
  #include "spine/Triangulator.h"
  
  namespace spine {
  	class Slot;
  
  	class ClippingAttachment;
  
  	class SP_API SkeletonClipping : public SpineObject {
  	public:
  		SkeletonClipping();
  
  		size_t clipStart(Slot &slot, ClippingAttachment *clip);
  
  		void clipEnd(Slot &slot);
  
  		void clipEnd();
  
  		void
  		clipTriangles(float *vertices, unsigned short *triangles, size_t trianglesLength, float *uvs, size_t stride);
  
  		void
  		clipTriangles(Vector<float> &vertices, Vector<unsigned short> &triangles, Vector<float> &uvs, size_t stride);
  
  		bool isClipping();
  
  		Vector<float> &getClippedVertices();
  
  		Vector<unsigned short> &getClippedTriangles();
  
  		Vector<float> &getClippedUVs();
  
  	private:
  		Triangulator _triangulator;
  		Vector<float> _clippingPolygon;
  		Vector<float> _clipOutput;
  		Vector<float> _clippedVertices;
  		Vector<unsigned short> _clippedTriangles;
  		Vector<float> _clippedUVs;
  		Vector<float> _scratch;
  		ClippingAttachment *_clipAttachment;
  		Vector<Vector<float> *> *_clippingPolygons;
  
  		/** Clips the input triangle against the convex, clockwise clipping area. If the triangle lies entirely within the clipping
  		  * area, false is returned. The clipping area must duplicate the first vertex at the end of the vertices list. */
  		bool clip(float x1, float y1, float x2, float y2, float x3, float y3, Vector<float> *clippingArea,
  				  Vector<float> *output);
  
  		static void makeClockwise(Vector<float> &polygon);
  	};
  }
  
  #endif /* Spine_SkeletonClipping_h */
  