agg_renderer_outline_aa.h

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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software 
// is granted provided this copyright notice appears in all copies. 
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: [e-mail]
//          [e-mail]
//          http://www.antigrain.com
//----------------------------------------------------------------------------
#ifndef AGG_RENDERER_OUTLINE_AA_INCLUDED
#define AGG_RENDERER_OUTLINE_AA_INCLUDED

#include "agg_basics.h"
#include "agg_math.h"
#include "agg_line_aa_basics.h"
#include "agg_dda_line.h"
#include "agg_ellipse_bresenham.h"
#include "agg_renderer_base.h"
#include "agg_gamma_functions.h"
#include "agg_clip_liang_barsky.h"

namespace agg
{

    //===================================================distance_interpolator0
    class distance_interpolator0
    {
    public:
        //---------------------------------------------------------------------
        distance_interpolator0() {}
        distance_interpolator0(int x1, int y1, int x2, int y2, int x, int y) :
            m_dx(line_mr(x2) - line_mr(x1)),
            m_dy(line_mr(y2) - line_mr(y1)),
            m_dist((line_mr(x + line_subpixel_scale/2) - line_mr(x2)) * m_dy - 
                   (line_mr(y + line_subpixel_scale/2) - line_mr(y2)) * m_dx)
        {
            m_dx <<= line_mr_subpixel_shift;
            m_dy <<= line_mr_subpixel_shift;
        }

        //---------------------------------------------------------------------
        void inc_x() { m_dist += m_dy; }
        int  dist() const { return m_dist; }

    private:
        //---------------------------------------------------------------------
        int m_dx;
        int m_dy;
        int m_dist;
    };

    //==================================================distance_interpolator00
    class distance_interpolator00
    {
    public:
        //---------------------------------------------------------------------
        distance_interpolator00() {}
        distance_interpolator00(int xc, int yc, 
                                int x1, int y1, int x2, int y2, 
                                int x,  int y) :
            m_dx1(line_mr(x1) - line_mr(xc)),
            m_dy1(line_mr(y1) - line_mr(yc)),
            m_dx2(line_mr(x2) - line_mr(xc)),
            m_dy2(line_mr(y2) - line_mr(yc)),
            m_dist1((line_mr(x + line_subpixel_scale/2) - line_mr(x1)) * m_dy1 - 
                    (line_mr(y + line_subpixel_scale/2) - line_mr(y1)) * m_dx1),
            m_dist2((line_mr(x + line_subpixel_scale/2) - line_mr(x2)) * m_dy2 - 
                    (line_mr(y + line_subpixel_scale/2) - line_mr(y2)) * m_dx2)
        {
            m_dx1 <<= line_mr_subpixel_shift;
            m_dy1 <<= line_mr_subpixel_shift;
            m_dx2 <<= line_mr_subpixel_shift;
            m_dy2 <<= line_mr_subpixel_shift;
        }

        //---------------------------------------------------------------------
        void inc_x() { m_dist1 += m_dy1; m_dist2 += m_dy2; }
        int  dist1() const { return m_dist1; }
        int  dist2() const { return m_dist2; }

    private:
        //---------------------------------------------------------------------
        int m_dx1;
        int m_dy1;
        int m_dx2;
        int m_dy2;
        int m_dist1;
        int m_dist2;
    };

    //===================================================distance_interpolator1
    class distance_interpolator1
    {
    public:
        //---------------------------------------------------------------------
        distance_interpolator1() {}
        distance_interpolator1(int x1, int y1, int x2, int y2, int x, int y) :
            m_dx(x2 - x1),
            m_dy(y2 - y1),
            m_dist(iround(double(x + line_subpixel_scale/2 - x2) * double(m_dy) - 
                          double(y + line_subpixel_scale/2 - y2) * double(m_dx)))
        {
            m_dx <<= line_subpixel_shift;
            m_dy <<= line_subpixel_shift;
        }

        //---------------------------------------------------------------------
        void inc_x() { m_dist += m_dy; }
        void dec_x() { m_dist -= m_dy; }
        void inc_y() { m_dist -= m_dx; }
        void dec_y() { m_dist += m_dx; }

        //---------------------------------------------------------------------
        void inc_x(int dy)
        {
            m_dist += m_dy; 
            if(dy > 0) m_dist -= m_dx; 
            if(dy < 0) m_dist += m_dx; 
        }

        //---------------------------------------------------------------------
        void dec_x(int dy)
        {
            m_dist -= m_dy; 
            if(dy > 0) m_dist -= m_dx; 
            if(dy < 0) m_dist += m_dx; 
        }

        //---------------------------------------------------------------------
        void inc_y(int dx)
        {
            m_dist -= m_dx; 
            if(dx > 0) m_dist += m_dy; 
            if(dx < 0) m_dist -= m_dy; 
        }

        void dec_y(int dx)
        //---------------------------------------------------------------------
        {
            m_dist += m_dx; 
            if(dx > 0) m_dist += m_dy; 
            if(dx < 0) m_dist -= m_dy; 
        }

        //---------------------------------------------------------------------
        int dist() const { return m_dist; }
        int dx()   const { return m_dx;   }
        int dy()   const { return m_dy;   }

    private:
        //---------------------------------------------------------------------
        int m_dx;
        int m_dy;
        int m_dist;
    };





    //===================================================distance_interpolator2
    class distance_interpolator2
    {
    public:
        //---------------------------------------------------------------------
        distance_interpolator2() {}
        distance_interpolator2(int x1, int y1, int x2, int y2,
                               int sx, int sy, int x,  int y) :
            m_dx(x2 - x1),
            m_dy(y2 - y1),
            m_dx_start(line_mr(sx) - line_mr(x1)),
            m_dy_start(line_mr(sy) - line_mr(y1)),

            m_dist(iround(double(x + line_subpixel_scale/2 - x2) * double(m_dy) - 
                          double(y + line_subpixel_scale/2 - y2) * double(m_dx))),

            m_dist_start((line_mr(x + line_subpixel_scale/2) - line_mr(sx)) * m_dy_start - 
                         (line_mr(y + line_subpixel_scale/2) - line_mr(sy)) * m_dx_start)
        {
            m_dx       <<= line_subpixel_shift;
            m_dy       <<= line_subpixel_shift;
            m_dx_start <<= line_mr_subpixel_shift;
            m_dy_start <<= line_mr_subpixel_shift;
        }

        distance_interpolator2(int x1, int y1, int x2, int y2,
                               int ex, int ey, int x,  int y, int) :
            m_dx(x2 - x1),
            m_dy(y2 - y1),
            m_dx_start(line_mr(ex) - line_mr(x2)),
            m_dy_start(line_mr(ey) - line_mr(y2)),

            m_dist(iround(double(x + line_subpixel_scale/2 - x2) * double(m_dy) - 
                          double(y + line_subpixel_scale/2 - y2) * double(m_dx))),

            m_dist_start((line_mr(x + line_subpixel_scale/2) - line_mr(ex)) * m_dy_start - 
                         (line_mr(y + line_subpixel_scale/2) - line_mr(ey)) * m_dx_start)
        {
            m_dx       <<= line_subpixel_shift;
            m_dy       <<= line_subpixel_shift;
            m_dx_start <<= line_mr_subpixel_shift;
            m_dy_start <<= line_mr_subpixel_shift;
        }


        //---------------------------------------------------------------------
        void inc_x() { m_dist += m_dy; m_dist_start += m_dy_start; }
        void dec_x() { m_dist -= m_dy; m_dist_start -= m_dy_start; }
        void inc_y() { m_dist -= m_dx; m_dist_start -= m_dx_start; }
        void dec_y() { m_dist += m_dx; m_dist_start += m_dx_start; }

        //---------------------------------------------------------------------
        void inc_x(int dy)
        {
            m_dist       += m_dy; 
            m_dist_start += m_dy_start; 
            if(dy > 0)
            {
                m_dist       -= m_dx; 
                m_dist_start -= m_dx_start; 
            }
            if(dy < 0)
            {
                m_dist       += m_dx; 
                m_dist_start += m_dx_start; 
            }
        }

        //---------------------------------------------------------------------
        void dec_x(int dy)
        {
            m_dist       -= m_dy; 
            m_dist_start -= m_dy_start; 
            if(dy > 0)
            {
                m_dist       -= m_dx; 
                m_dist_start -= m_dx_start; 
            }
            if(dy < 0)
            {
                m_dist       += m_dx; 
                m_dist_start += m_dx_start; 
            }
        }

        //---------------------------------------------------------------------
        void inc_y(int dx)
        {
            m_dist       -= m_dx; 
            m_dist_start -= m_dx_start; 
            if(dx > 0)
            {
                m_dist       += m_dy; 
                m_dist_start += m_dy_start; 
            }
            if(dx < 0)
            {
                m_dist       -= m_dy; 
                m_dist_start -= m_dy_start; 
            }
        }

        //---------------------------------------------------------------------
        void dec_y(int dx)
        {
            m_dist       += m_dx; 
            m_dist_start += m_dx_start; 
            if(dx > 0)
            {
                m_dist       += m_dy; 
                m_dist_start += m_dy_start; 
            }
            if(dx < 0)
            {
                m_dist       -= m_dy; 
                m_dist_start -= m_dy_start; 
            }
        }

        //---------------------------------------------------------------------
        int dist()       const { return m_dist;       }
        int dist_start() const { return m_dist_start; }
        int dist_end()   const { return m_dist_start; }

        //---------------------------------------------------------------------
        int dx()       const { return m_dx;       }
        int dy()       const { return m_dy;       }
        int dx_start() const { return m_dx_start; }
        int dy_start() const { return m_dy_start; }
        int dx_end()   const { return m_dx_start; }
        int dy_end()   const { return m_dy_start; }

    private:
        //---------------------------------------------------------------------
        int m_dx;
        int m_dy;
        int m_dx_start;
        int m_dy_start;

        int m_dist;
        int m_dist_start;
    };





    //===================================================distance_interpolator3
    class distance_interpolator3
    {
    public:
        //---------------------------------------------------------------------
        distance_interpolator3() {}
        distance_interpolator3(int x1, int y1, int x2, int y2,
                               int sx, int sy, int ex, int ey, 
                               int x,  int y) :
            m_dx(x2 - x1),
            m_dy(y2 - y1),
            m_dx_start(line_mr(sx) - line_mr(x1)),
            m_dy_start(line_mr(sy) - line_mr(y1)),
            m_dx_end(line_mr(ex) - line_mr(x2)),
            m_dy_end(line_mr(ey) - line_mr(y2)),

            m_dist(iround(double(x + line_subpixel_scale/2 - x2) * double(m_dy) - 
                          double(y + line_subpixel_scale/2 - y2) * double(m_dx))),

            m_dist_start((line_mr(x + line_subpixel_scale/2) - line_mr(sx)) * m_dy_start - 
                         (line_mr(y + line_subpixel_scale/2) - line_mr(sy)) * m_dx_start),

            m_dist_end((line_mr(x + line_subpixel_scale/2) - line_mr(ex)) * m_dy_end - 
                       (line_mr(y + line_subpixel_scale/2) - line_mr(ey)) * m_dx_end)
        {
            m_dx       <<= line_subpixel_shift;
            m_dy       <<= line_subpixel_shift;
            m_dx_start <<= line_mr_subpixel_shift;
            m_dy_start <<= line_mr_subpixel_shift;
            m_dx_end   <<= line_mr_subpixel_shift;
            m_dy_end   <<= line_mr_subpixel_shift;
        }

        //---------------------------------------------------------------------
        void inc_x() { m_dist += m_dy; m_dist_start += m_dy_start; m_dist_end += m_dy_end; }
        void dec_x() { m_dist -= m_dy; m_dist_start -= m_dy_start; m_dist_end -= m_dy_end; }
        void inc_y() { m_dist -= m_dx; m_dist_start -= m_dx_start; m_dist_end -= m_dx_end; }
        void dec_y() { m_dist += m_dx; m_dist_start += m_dx_start; m_dist_end += m_dx_end; }

        //---------------------------------------------------------------------
        void inc_x(int dy)
        {
            m_dist       += m_dy; 
            m_dist_start += m_dy_start; 
            m_dist_end   += m_dy_end;
            if(dy > 0)
            {
                m_dist       -= m_dx; 
                m_dist_start -= m_dx_start; 
                m_dist_end   -= m_dx_end;
            }
            if(dy < 0)
            {
                m_dist       += m_dx; 
                m_dist_start += m_dx_start; 
                m_dist_end   += m_dx_end;
            }
        }