39241fe228
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9933 a95241bf-73f2-0310-859d-f6bbb57e9c96
124 lines
4.3 KiB
C++
124 lines
4.3 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 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_LINE_AA_BASICS_INCLUDED
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#define AGG_LINE_AA_BASICS_INCLUDED
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#include <stdlib.h>
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#include "agg_basics.h"
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namespace agg
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{
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// See Implementation agg_line_aa_basics.cpp
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//-------------------------------------------------------------------------
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enum
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{
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line_subpixel_shift = 8, //----line_subpixel_shift
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line_subpixel_size = 1 << line_subpixel_shift, //----line_subpixel_size
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line_subpixel_mask = line_subpixel_size - 1 //----line_subpixel_mask
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};
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//-------------------------------------------------------------------------
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enum
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{
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line_mr_subpixel_shift = 4, //----line_mr_subpixel_shift
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line_mr_subpixel_size = 1 << line_mr_subpixel_shift, //----line_mr_subpixel_size
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line_mr_subpixel_mask = line_mr_subpixel_size - 1 //----line_mr_subpixel_mask
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};
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//------------------------------------------------------------------line_mr
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inline int line_mr(int x)
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{
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return x >> (line_subpixel_shift - line_mr_subpixel_shift);
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}
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//-------------------------------------------------------------------line_hr
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inline int line_hr(int x)
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{
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return x << (line_subpixel_shift - line_mr_subpixel_shift);
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}
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//---------------------------------------------------------------line_dbl_hr
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inline int line_dbl_hr(int x)
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{
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return x << line_subpixel_shift;
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}
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//---------------------------------------------------------------line_coord
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inline int line_coord(double x)
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{
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return int(x * line_subpixel_size);
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}
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//==========================================================line_parameters
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struct line_parameters
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{
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//---------------------------------------------------------------------
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line_parameters() {}
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line_parameters(int x1_, int y1_, int x2_, int y2_, int len_) :
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x1(x1_), y1(y1_), x2(x2_), y2(y2_),
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dx(abs(x2_ - x1_)),
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dy(abs(y2_ - y1_)),
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sx((x2_ > x1_) ? 1 : -1),
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sy((y2_ > y1_) ? 1 : -1),
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vertical(dy >= dx),
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inc(vertical ? sy : sx),
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len(len_),
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octant((sy & 4) | (sx & 2) | int(vertical))
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{
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}
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//---------------------------------------------------------------------
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unsigned orthogonal_quadrant() const { return s_orthogonal_quadrant[octant]; }
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unsigned diagonal_quadrant() const { return s_diagonal_quadrant[octant]; }
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//---------------------------------------------------------------------
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bool same_orthogonal_quadrant(const line_parameters& lp) const
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{
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return s_orthogonal_quadrant[octant] == s_orthogonal_quadrant[lp.octant];
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}
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//---------------------------------------------------------------------
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bool same_diagonal_quadrant(const line_parameters& lp) const
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{
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return s_diagonal_quadrant[octant] == s_diagonal_quadrant[lp.octant];
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}
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//---------------------------------------------------------------------
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int x1, y1, x2, y2, dx, dy, sx, sy;
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bool vertical;
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int inc;
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int len;
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int octant;
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//---------------------------------------------------------------------
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static int8u s_orthogonal_quadrant[8];
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static int8u s_diagonal_quadrant[8];
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};
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// See Implementation agg_line_aa_basics.cpp
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//----------------------------------------------------------------bisectrix
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void bisectrix(const line_parameters& l1,
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const line_parameters& l2,
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int* x, int* y);
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}
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#endif
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