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Diffstat (limited to 'src/agg/agg_rasterizer_sl_clip.h')
-rw-r--r-- | src/agg/agg_rasterizer_sl_clip.h | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/src/agg/agg_rasterizer_sl_clip.h b/src/agg/agg_rasterizer_sl_clip.h new file mode 100644 index 000000000..3a7f3a103 --- /dev/null +++ b/src/agg/agg_rasterizer_sl_clip.h @@ -0,0 +1,351 @@ +//---------------------------------------------------------------------------- +// 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, coord_type, coord_type, coord_type) {} + 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 |