352 lines
13 KiB
C
352 lines
13 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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#ifndef AGG_RASTERIZER_SL_CLIP_INCLUDED
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#define AGG_RASTERIZER_SL_CLIP_INCLUDED
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#include "agg_clip_liang_barsky.h"
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namespace agg
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{
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//--------------------------------------------------------poly_max_coord_e
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enum poly_max_coord_e
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{
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poly_max_coord = (1 << 30) - 1 //----poly_max_coord
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};
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//------------------------------------------------------------ras_conv_int
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struct ras_conv_int
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{
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typedef int coord_type;
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static AGG_INLINE int mul_div(double a, double b, double c)
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{
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return iround(a * b / c);
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}
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static int xi(int v) { return v; }
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static int yi(int v) { return v; }
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static int upscale(double v) { return iround(v * poly_subpixel_scale); }
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static int downscale(int v) { return v; }
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};
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//--------------------------------------------------------ras_conv_int_sat
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struct ras_conv_int_sat
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{
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typedef int coord_type;
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static AGG_INLINE int mul_div(double a, double b, double c)
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{
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return saturation<poly_max_coord>::iround(a * b / c);
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}
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static int xi(int v) { return v; }
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static int yi(int v) { return v; }
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static int upscale(double v)
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{
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return saturation<poly_max_coord>::iround(v * poly_subpixel_scale);
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}
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static int downscale(int v) { return v; }
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};
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//---------------------------------------------------------ras_conv_int_3x
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struct ras_conv_int_3x
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{
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typedef int coord_type;
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static AGG_INLINE int mul_div(double a, double b, double c)
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{
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return iround(a * b / c);
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}
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static int xi(int v) { return v * 3; }
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static int yi(int v) { return v; }
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static int upscale(double v) { return iround(v * poly_subpixel_scale); }
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static int downscale(int v) { return v; }
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};
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//-----------------------------------------------------------ras_conv_dbl
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struct ras_conv_dbl
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{
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typedef double coord_type;
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static AGG_INLINE double mul_div(double a, double b, double c)
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{
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return a * b / c;
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}
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static int xi(double v) { return iround(v * poly_subpixel_scale); }
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static int yi(double v) { return iround(v * poly_subpixel_scale); }
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static double upscale(double v) { return v; }
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static double downscale(int v) { return v / double(poly_subpixel_scale); }
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};
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//--------------------------------------------------------ras_conv_dbl_3x
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struct ras_conv_dbl_3x
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{
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typedef double coord_type;
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static AGG_INLINE double mul_div(double a, double b, double c)
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{
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return a * b / c;
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}
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static int xi(double v) { return iround(v * poly_subpixel_scale * 3); }
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static int yi(double v) { return iround(v * poly_subpixel_scale); }
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static double upscale(double v) { return v; }
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static double downscale(int v) { return v / double(poly_subpixel_scale); }
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};
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//------------------------------------------------------rasterizer_sl_clip
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template<class Conv> class rasterizer_sl_clip
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{
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public:
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typedef Conv conv_type;
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typedef typename Conv::coord_type coord_type;
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typedef rect_base<coord_type> rect_type;
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//--------------------------------------------------------------------
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rasterizer_sl_clip() :
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m_clip_box(0,0,0,0),
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m_x1(0),
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m_y1(0),
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m_f1(0),
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m_clipping(false)
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{}
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//--------------------------------------------------------------------
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void reset_clipping()
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{
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m_clipping = false;
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}
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//--------------------------------------------------------------------
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void clip_box(coord_type x1, coord_type y1, coord_type x2, coord_type y2)
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{
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m_clip_box = rect_type(x1, y1, x2, y2);
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m_clip_box.normalize();
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m_clipping = true;
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}
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//--------------------------------------------------------------------
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void move_to(coord_type x1, coord_type y1)
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{
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m_x1 = x1;
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m_y1 = y1;
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if(m_clipping) m_f1 = clipping_flags(x1, y1, m_clip_box);
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}
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private:
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//------------------------------------------------------------------------
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template<class Rasterizer>
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AGG_INLINE void line_clip_y(Rasterizer& ras,
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coord_type x1, coord_type y1,
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coord_type x2, coord_type y2,
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unsigned f1, unsigned f2) const
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{
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f1 &= 10;
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f2 &= 10;
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if((f1 | f2) == 0)
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{
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// Fully visible
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ras.line(Conv::xi(x1), Conv::yi(y1), Conv::xi(x2), Conv::yi(y2));
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}
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else
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{
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if(f1 == f2)
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{
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// Invisible by Y
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return;
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}
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coord_type tx1 = x1;
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coord_type ty1 = y1;
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coord_type tx2 = x2;
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coord_type ty2 = y2;
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if(f1 & 8) // y1 < clip.y1
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{
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tx1 = x1 + Conv::mul_div(m_clip_box.y1-y1, x2-x1, y2-y1);
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ty1 = m_clip_box.y1;
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}
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if(f1 & 2) // y1 > clip.y2
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{
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tx1 = x1 + Conv::mul_div(m_clip_box.y2-y1, x2-x1, y2-y1);
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ty1 = m_clip_box.y2;
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}
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if(f2 & 8) // y2 < clip.y1
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{
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tx2 = x1 + Conv::mul_div(m_clip_box.y1-y1, x2-x1, y2-y1);
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ty2 = m_clip_box.y1;
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}
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if(f2 & 2) // y2 > clip.y2
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{
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tx2 = x1 + Conv::mul_div(m_clip_box.y2-y1, x2-x1, y2-y1);
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ty2 = m_clip_box.y2;
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}
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ras.line(Conv::xi(tx1), Conv::yi(ty1),
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Conv::xi(tx2), Conv::yi(ty2));
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}
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}
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public:
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//--------------------------------------------------------------------
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template<class Rasterizer>
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void line_to(Rasterizer& ras, coord_type x2, coord_type y2)
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{
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if(m_clipping)
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{
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unsigned f2 = clipping_flags(x2, y2, m_clip_box);
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if((m_f1 & 10) == (f2 & 10) && (m_f1 & 10) != 0)
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{
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// Invisible by Y
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m_x1 = x2;
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m_y1 = y2;
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m_f1 = f2;
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return;
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}
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coord_type x1 = m_x1;
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coord_type y1 = m_y1;
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unsigned f1 = m_f1;
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coord_type y3, y4;
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unsigned f3, f4;
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switch(((f1 & 5) << 1) | (f2 & 5))
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{
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case 0: // Visible by X
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line_clip_y(ras, x1, y1, x2, y2, f1, f2);
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break;
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case 1: // x2 > clip.x2
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y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
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f3 = clipping_flags_y(y3, m_clip_box);
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line_clip_y(ras, x1, y1, m_clip_box.x2, y3, f1, f3);
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line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x2, y2, f3, f2);
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break;
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case 2: // x1 > clip.x2
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y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
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f3 = clipping_flags_y(y3, m_clip_box);
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line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3);
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line_clip_y(ras, m_clip_box.x2, y3, x2, y2, f3, f2);
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break;
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case 3: // x1 > clip.x2 && x2 > clip.x2
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line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y2, f1, f2);
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break;
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case 4: // x2 < clip.x1
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y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
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f3 = clipping_flags_y(y3, m_clip_box);
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line_clip_y(ras, x1, y1, m_clip_box.x1, y3, f1, f3);
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line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x1, y2, f3, f2);
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break;
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case 6: // x1 > clip.x2 && x2 < clip.x1
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y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
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y4 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
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f3 = clipping_flags_y(y3, m_clip_box);
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f4 = clipping_flags_y(y4, m_clip_box);
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line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3);
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line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x1, y4, f3, f4);
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line_clip_y(ras, m_clip_box.x1, y4, m_clip_box.x1, y2, f4, f2);
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break;
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case 8: // x1 < clip.x1
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y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
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f3 = clipping_flags_y(y3, m_clip_box);
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line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3);
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line_clip_y(ras, m_clip_box.x1, y3, x2, y2, f3, f2);
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break;
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case 9: // x1 < clip.x1 && x2 > clip.x2
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y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
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y4 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
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f3 = clipping_flags_y(y3, m_clip_box);
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f4 = clipping_flags_y(y4, m_clip_box);
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line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3);
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line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x2, y4, f3, f4);
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line_clip_y(ras, m_clip_box.x2, y4, m_clip_box.x2, y2, f4, f2);
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break;
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case 12: // x1 < clip.x1 && x2 < clip.x1
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line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y2, f1, f2);
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break;
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}
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m_f1 = f2;
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}
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else
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{
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ras.line(Conv::xi(m_x1), Conv::yi(m_y1),
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Conv::xi(x2), Conv::yi(y2));
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}
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m_x1 = x2;
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m_y1 = y2;
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}
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private:
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rect_type m_clip_box;
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coord_type m_x1;
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coord_type m_y1;
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unsigned m_f1;
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bool m_clipping;
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};
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//---------------------------------------------------rasterizer_sl_no_clip
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class rasterizer_sl_no_clip
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{
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public:
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typedef ras_conv_int conv_type;
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typedef int coord_type;
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rasterizer_sl_no_clip() : m_x1(0), m_y1(0) {}
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void reset_clipping() {}
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void clip_box(coord_type, coord_type, coord_type, coord_type) {}
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void move_to(coord_type x1, coord_type y1) { m_x1 = x1; m_y1 = y1; }
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template<class Rasterizer>
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void line_to(Rasterizer& ras, coord_type x2, coord_type y2)
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{
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ras.line(m_x1, m_y1, x2, y2);
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m_x1 = x2;
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m_y1 = y2;
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}
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private:
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int m_x1, m_y1;
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};
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// -----rasterizer_sl_clip_int
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// -----rasterizer_sl_clip_int_sat
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// -----rasterizer_sl_clip_int_3x
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// -----rasterizer_sl_clip_dbl
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// -----rasterizer_sl_clip_dbl_3x
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//------------------------------------------------------------------------
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typedef rasterizer_sl_clip<ras_conv_int> rasterizer_sl_clip_int;
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typedef rasterizer_sl_clip<ras_conv_int_sat> rasterizer_sl_clip_int_sat;
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typedef rasterizer_sl_clip<ras_conv_int_3x> rasterizer_sl_clip_int_3x;
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typedef rasterizer_sl_clip<ras_conv_dbl> rasterizer_sl_clip_dbl;
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typedef rasterizer_sl_clip<ras_conv_dbl_3x> rasterizer_sl_clip_dbl_3x;
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}
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#endif
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