YiPolygonFill.h

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// © You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_POLYGON_FILL_H_
#define _YI_POLYGON_FILL_H_

#include "framework/YiPredef.h"
#include <glm/gtc/type_ptr.hpp>

class CYIBitmap;
class CYIColor;
class CYIGradient;

struct YI_POLYGON_VERTEX
{
    float x;
    float y;
    bool         bStartOfSegment;
    YI_POLYGON_VERTEX() : x(0), y(0), bStartOfSegment(false) {}
};

typedef std::vector<YI_POLYGON_VERTEX>  CYIPolygonData;

class CYIPolygonFill
{

public:
    static const uint32_t MAX_EDGES = 1000;

    CYIPolygonFill();
    virtual ~CYIPolygonFill();

    bool Create(int32_t nWidth, int32_t nHeight);

    void Destroy();

    void Fill(CYIBitmap *pBitmap, const CYIPolygonData *pPolygonData, const glm::vec4 &bounds, const CYIColor &Color, CYIGradient *pGradient, bool bNonZeroFill);

    static void PolygonDataBounds(const CYIPolygonData &polygonDataIn, glm::vec4 &polygonBounds);
    
private:

    typedef struct
    {
        int32_t nFirstLine;
        int32_t nLastLine;
        float fxX;
        float fxSlope;
        int32_t nWinding;
    }
    YI_POLY_EDGE;

    uint32_t GetEdges(const CYIPolygonData *pPolygonData, uint32_t nVertexStart);

    void MaskEdge(YI_POLY_EDGE *pEdge, bool bNonZeroFill);
    void InternalFill(CYIBitmap *pBitmap, const CYIColor &Color, CYIGradient *pGradient, bool bNonZeroFill);

    uint32_t *m_pMask;
    int32_t *m_pWinding;
    uint32_t *m_pGradientLUT;
    int32_t m_nGradientLUTSize;
    YI_POLY_EDGE    *m_pEdges;
    int32_t m_nWidth;
    int32_t m_nHeight;
    glm::vec4       m_Bounds;

    YI_DISALLOW_COPY_AND_ASSIGN(CYIPolygonFill)
};

#endif // _YI_POLYGON_FILL_H_