351 lines
13 KiB
C++
351 lines
13 KiB
C++
//----------------------------------------------------------------------------
|
|
// 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: mcseem@antigrain.com
|
|
// mcseemagg@yahoo.com
|
|
// http://www.antigrain.com
|
|
//----------------------------------------------------------------------------
|
|
#ifndef AGG_RASTERIZER_SL_CLIP_INCLUDED
|
|
#define AGG_RASTERIZER_SL_CLIP_INCLUDED
|
|
|
|
#include "agg_clip_liang_barsky.h"
|
|
|
|
namespace agg
|
|
{
|
|
//--------------------------------------------------------poly_max_coord_e
|
|
enum poly_max_coord_e
|
|
{
|
|
poly_max_coord = (1 << 30) - 1 //----poly_max_coord
|
|
};
|
|
|
|
//------------------------------------------------------------ras_conv_int
|
|
struct ras_conv_int
|
|
{
|
|
typedef int coord_type;
|
|
static AGG_INLINE int mul_div(double a, double b, double c)
|
|
{
|
|
return iround(a * b / c);
|
|
}
|
|
static int xi(int v) { return v; }
|
|
static int yi(int v) { return v; }
|
|
static int upscale(double v) { return iround(v * poly_subpixel_scale); }
|
|
static int downscale(int v) { return v; }
|
|
};
|
|
|
|
//--------------------------------------------------------ras_conv_int_sat
|
|
struct ras_conv_int_sat
|
|
{
|
|
typedef int coord_type;
|
|
static AGG_INLINE int mul_div(double a, double b, double c)
|
|
{
|
|
return saturation<poly_max_coord>::iround(a * b / c);
|
|
}
|
|
static int xi(int v) { return v; }
|
|
static int yi(int v) { return v; }
|
|
static int upscale(double v)
|
|
{
|
|
return saturation<poly_max_coord>::iround(v * poly_subpixel_scale);
|
|
}
|
|
static int downscale(int v) { return v; }
|
|
};
|
|
|
|
//---------------------------------------------------------ras_conv_int_3x
|
|
struct ras_conv_int_3x
|
|
{
|
|
typedef int coord_type;
|
|
static AGG_INLINE int mul_div(double a, double b, double c)
|
|
{
|
|
return iround(a * b / c);
|
|
}
|
|
static int xi(int v) { return v * 3; }
|
|
static int yi(int v) { return v; }
|
|
static int upscale(double v) { return iround(v * poly_subpixel_scale); }
|
|
static int downscale(int v) { return v; }
|
|
};
|
|
|
|
//-----------------------------------------------------------ras_conv_dbl
|
|
struct ras_conv_dbl
|
|
{
|
|
typedef double coord_type;
|
|
static AGG_INLINE double mul_div(double a, double b, double c)
|
|
{
|
|
return a * b / c;
|
|
}
|
|
static int xi(double v) { return iround(v * poly_subpixel_scale); }
|
|
static int yi(double v) { return iround(v * poly_subpixel_scale); }
|
|
static double upscale(double v) { return v; }
|
|
static double downscale(int v) { return v / double(poly_subpixel_scale); }
|
|
};
|
|
|
|
//--------------------------------------------------------ras_conv_dbl_3x
|
|
struct ras_conv_dbl_3x
|
|
{
|
|
typedef double coord_type;
|
|
static AGG_INLINE double mul_div(double a, double b, double c)
|
|
{
|
|
return a * b / c;
|
|
}
|
|
static int xi(double v) { return iround(v * poly_subpixel_scale * 3); }
|
|
static int yi(double v) { return iround(v * poly_subpixel_scale); }
|
|
static double upscale(double v) { return v; }
|
|
static double downscale(int v) { return v / double(poly_subpixel_scale); }
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
//------------------------------------------------------rasterizer_sl_clip
|
|
template<class Conv> class rasterizer_sl_clip
|
|
{
|
|
public:
|
|
typedef Conv conv_type;
|
|
typedef typename Conv::coord_type coord_type;
|
|
typedef rect_base<coord_type> rect_type;
|
|
|
|
//--------------------------------------------------------------------
|
|
rasterizer_sl_clip() :
|
|
m_clip_box(0,0,0,0),
|
|
m_x1(0),
|
|
m_y1(0),
|
|
m_f1(0),
|
|
m_clipping(false)
|
|
{}
|
|
|
|
//--------------------------------------------------------------------
|
|
void reset_clipping()
|
|
{
|
|
m_clipping = false;
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
void clip_box(coord_type x1, coord_type y1, coord_type x2, coord_type y2)
|
|
{
|
|
m_clip_box = rect_type(x1, y1, x2, y2);
|
|
m_clip_box.normalize();
|
|
m_clipping = true;
|
|
}
|
|
|
|
//--------------------------------------------------------------------
|
|
void move_to(coord_type x1, coord_type y1)
|
|
{
|
|
m_x1 = x1;
|
|
m_y1 = y1;
|
|
if(m_clipping) m_f1 = clipping_flags(x1, y1, m_clip_box);
|
|
}
|
|
|
|
private:
|
|
//------------------------------------------------------------------------
|
|
template<class Rasterizer>
|
|
AGG_INLINE void line_clip_y(Rasterizer& ras,
|
|
coord_type x1, coord_type y1,
|
|
coord_type x2, coord_type y2,
|
|
unsigned f1, unsigned f2) const
|
|
{
|
|
f1 &= 10;
|
|
f2 &= 10;
|
|
if((f1 | f2) == 0)
|
|
{
|
|
// Fully visible
|
|
ras.line(Conv::xi(x1), Conv::yi(y1), Conv::xi(x2), Conv::yi(y2));
|
|
}
|
|
else
|
|
{
|
|
if(f1 == f2)
|
|
{
|
|
// Invisible by Y
|
|
return;
|
|
}
|
|
|
|
coord_type tx1 = x1;
|
|
coord_type ty1 = y1;
|
|
coord_type tx2 = x2;
|
|
coord_type ty2 = y2;
|
|
|
|
if(f1 & 8) // y1 < clip.y1
|
|
{
|
|
tx1 = x1 + Conv::mul_div(m_clip_box.y1-y1, x2-x1, y2-y1);
|
|
ty1 = m_clip_box.y1;
|
|
}
|
|
|
|
if(f1 & 2) // y1 > clip.y2
|
|
{
|
|
tx1 = x1 + Conv::mul_div(m_clip_box.y2-y1, x2-x1, y2-y1);
|
|
ty1 = m_clip_box.y2;
|
|
}
|
|
|
|
if(f2 & 8) // y2 < clip.y1
|
|
{
|
|
tx2 = x1 + Conv::mul_div(m_clip_box.y1-y1, x2-x1, y2-y1);
|
|
ty2 = m_clip_box.y1;
|
|
}
|
|
|
|
if(f2 & 2) // y2 > clip.y2
|
|
{
|
|
tx2 = x1 + Conv::mul_div(m_clip_box.y2-y1, x2-x1, y2-y1);
|
|
ty2 = m_clip_box.y2;
|
|
}
|
|
ras.line(Conv::xi(tx1), Conv::yi(ty1),
|
|
Conv::xi(tx2), Conv::yi(ty2));
|
|
}
|
|
}
|
|
|
|
|
|
public:
|
|
//--------------------------------------------------------------------
|
|
template<class Rasterizer>
|
|
void line_to(Rasterizer& ras, coord_type x2, coord_type y2)
|
|
{
|
|
if(m_clipping)
|
|
{
|
|
unsigned f2 = clipping_flags(x2, y2, m_clip_box);
|
|
|
|
if((m_f1 & 10) == (f2 & 10) && (m_f1 & 10) != 0)
|
|
{
|
|
// Invisible by Y
|
|
m_x1 = x2;
|
|
m_y1 = y2;
|
|
m_f1 = f2;
|
|
return;
|
|
}
|
|
|
|
coord_type x1 = m_x1;
|
|
coord_type y1 = m_y1;
|
|
unsigned f1 = m_f1;
|
|
coord_type y3, y4;
|
|
unsigned f3, f4;
|
|
|
|
switch(((f1 & 5) << 1) | (f2 & 5))
|
|
{
|
|
case 0: // Visible by X
|
|
line_clip_y(ras, x1, y1, x2, y2, f1, f2);
|
|
break;
|
|
|
|
case 1: // x2 > clip.x2
|
|
y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
|
|
f3 = clipping_flags_y(y3, m_clip_box);
|
|
line_clip_y(ras, x1, y1, m_clip_box.x2, y3, f1, f3);
|
|
line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x2, y2, f3, f2);
|
|
break;
|
|
|
|
case 2: // x1 > clip.x2
|
|
y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
|
|
f3 = clipping_flags_y(y3, m_clip_box);
|
|
line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3);
|
|
line_clip_y(ras, m_clip_box.x2, y3, x2, y2, f3, f2);
|
|
break;
|
|
|
|
case 3: // x1 > clip.x2 && x2 > clip.x2
|
|
line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y2, f1, f2);
|
|
break;
|
|
|
|
case 4: // x2 < clip.x1
|
|
y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
|
|
f3 = clipping_flags_y(y3, m_clip_box);
|
|
line_clip_y(ras, x1, y1, m_clip_box.x1, y3, f1, f3);
|
|
line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x1, y2, f3, f2);
|
|
break;
|
|
|
|
case 6: // x1 > clip.x2 && x2 < clip.x1
|
|
y3 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
|
|
y4 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
|
|
f3 = clipping_flags_y(y3, m_clip_box);
|
|
f4 = clipping_flags_y(y4, m_clip_box);
|
|
line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3);
|
|
line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x1, y4, f3, f4);
|
|
line_clip_y(ras, m_clip_box.x1, y4, m_clip_box.x1, y2, f4, f2);
|
|
break;
|
|
|
|
case 8: // x1 < clip.x1
|
|
y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
|
|
f3 = clipping_flags_y(y3, m_clip_box);
|
|
line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3);
|
|
line_clip_y(ras, m_clip_box.x1, y3, x2, y2, f3, f2);
|
|
break;
|
|
|
|
case 9: // x1 < clip.x1 && x2 > clip.x2
|
|
y3 = y1 + Conv::mul_div(m_clip_box.x1-x1, y2-y1, x2-x1);
|
|
y4 = y1 + Conv::mul_div(m_clip_box.x2-x1, y2-y1, x2-x1);
|
|
f3 = clipping_flags_y(y3, m_clip_box);
|
|
f4 = clipping_flags_y(y4, m_clip_box);
|
|
line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3);
|
|
line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x2, y4, f3, f4);
|
|
line_clip_y(ras, m_clip_box.x2, y4, m_clip_box.x2, y2, f4, f2);
|
|
break;
|
|
|
|
case 12: // x1 < clip.x1 && x2 < clip.x1
|
|
line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y2, f1, f2);
|
|
break;
|
|
}
|
|
m_f1 = f2;
|
|
}
|
|
else
|
|
{
|
|
ras.line(Conv::xi(m_x1), Conv::yi(m_y1),
|
|
Conv::xi(x2), Conv::yi(y2));
|
|
}
|
|
m_x1 = x2;
|
|
m_y1 = y2;
|
|
}
|
|
|
|
|
|
private:
|
|
rect_type m_clip_box;
|
|
coord_type m_x1;
|
|
coord_type m_y1;
|
|
unsigned m_f1;
|
|
bool m_clipping;
|
|
};
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------rasterizer_sl_no_clip
|
|
class rasterizer_sl_no_clip
|
|
{
|
|
public:
|
|
typedef ras_conv_int conv_type;
|
|
typedef int coord_type;
|
|
|
|
rasterizer_sl_no_clip() : m_x1(0), m_y1(0) {}
|
|
|
|
void reset_clipping() {}
|
|
void clip_box(coord_type /*x1*/, coord_type /*y1*/, coord_type /*x2*/, coord_type /*y2*/) {}
|
|
void move_to(coord_type x1, coord_type y1) { m_x1 = x1; m_y1 = y1; }
|
|
|
|
template<class Rasterizer>
|
|
void line_to(Rasterizer& ras, coord_type x2, coord_type y2)
|
|
{
|
|
ras.line(m_x1, m_y1, x2, y2);
|
|
m_x1 = x2;
|
|
m_y1 = y2;
|
|
}
|
|
|
|
private:
|
|
int m_x1, m_y1;
|
|
};
|
|
|
|
|
|
// -----rasterizer_sl_clip_int
|
|
// -----rasterizer_sl_clip_int_sat
|
|
// -----rasterizer_sl_clip_int_3x
|
|
// -----rasterizer_sl_clip_dbl
|
|
// -----rasterizer_sl_clip_dbl_3x
|
|
//------------------------------------------------------------------------
|
|
typedef rasterizer_sl_clip<ras_conv_int> rasterizer_sl_clip_int;
|
|
typedef rasterizer_sl_clip<ras_conv_int_sat> rasterizer_sl_clip_int_sat;
|
|
typedef rasterizer_sl_clip<ras_conv_int_3x> rasterizer_sl_clip_int_3x;
|
|
typedef rasterizer_sl_clip<ras_conv_dbl> rasterizer_sl_clip_dbl;
|
|
typedef rasterizer_sl_clip<ras_conv_dbl_3x> rasterizer_sl_clip_dbl_3x;
|
|
|
|
|
|
}
|
|
|
|
#endif
|