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Diffstat (limited to 'third_party/agg23/agg_curves.cpp')
| -rw-r--r-- | third_party/agg23/agg_curves.cpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/third_party/agg23/agg_curves.cpp b/third_party/agg23/agg_curves.cpp new file mode 100644 index 0000000000..5a2d5631d6 --- /dev/null +++ b/third_party/agg23/agg_curves.cpp @@ -0,0 +1,109 @@ + +//---------------------------------------------------------------------------- +// XYQ: 2006-01-22 Copied from AGG project. +// TODO: This file uses intensive floating point operations, so it's NOT suitable +// for platforms like Symbian OS. We need to change to FIX format. +//---------------------------------------------------------------------------- +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// 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 +//---------------------------------------------------------------------------- +#include "../../core/include/fxcrt/fx_basic.h" +#include "agg_curves.h" +#include "agg_math.h" +namespace agg +{ +const FX_FLOAT curve_collinearity_epsilon = 1e-30f; +enum curve_recursion_limit_e { curve_recursion_limit = 16 }; +void curve4_div::init(FX_FLOAT x1, FX_FLOAT y1, + FX_FLOAT x2, FX_FLOAT y2, + FX_FLOAT x3, FX_FLOAT y3, + FX_FLOAT x4, FX_FLOAT y4) +{ + m_points.remove_all(); + m_distance_tolerance_square = 1.0f / 4; + m_distance_tolerance_manhattan = 1.0f * 4; + bezier(x1, y1, x2, y2, x3, y3, x4, y4); + m_count = 0; +} +void curve4_div::recursive_bezier(FX_FLOAT x1, FX_FLOAT y1, + FX_FLOAT x2, FX_FLOAT y2, + FX_FLOAT x3, FX_FLOAT y3, + FX_FLOAT x4, FX_FLOAT y4, + unsigned level) +{ + if(level > curve_recursion_limit) { + return; + } + FX_FLOAT x12 = (x1 + x2) / 2; + FX_FLOAT y12 = (y1 + y2) / 2; + FX_FLOAT x23 = (x2 + x3) / 2; + FX_FLOAT y23 = (y2 + y3) / 2; + FX_FLOAT x34 = (x3 + x4) / 2; + FX_FLOAT y34 = (y3 + y4) / 2; + FX_FLOAT x123 = (x12 + x23) / 2; + FX_FLOAT y123 = (y12 + y23) / 2; + FX_FLOAT x234 = (x23 + x34) / 2; + FX_FLOAT y234 = (y23 + y34) / 2; + FX_FLOAT x1234 = (x123 + x234) / 2; + FX_FLOAT y1234 = (y123 + y234) / 2; + FX_FLOAT dx = x4 - x1; + FX_FLOAT dy = y4 - y1; + FX_FLOAT d2 = FXSYS_fabs(FXSYS_Mul(x2 - x4, dy) - FXSYS_Mul(y2 - y4, dx)); + FX_FLOAT d3 = FXSYS_fabs(FXSYS_Mul(x3 - x4, dy) - FXSYS_Mul(y3 - y4, dx)); + switch((int(d2 > curve_collinearity_epsilon) << 1) + + int(d3 > curve_collinearity_epsilon)) { + case 0: + if(FXSYS_fabs(x1 + x3 - x2 - x2) + + FXSYS_fabs(y1 + y3 - y2 - y2) + + FXSYS_fabs(x2 + x4 - x3 - x3) + + FXSYS_fabs(y2 + y4 - y3 - y3) <= m_distance_tolerance_manhattan) { + m_points.add(point_type(x1234, y1234, path_flags_jr)); + return; + } + break; + case 1: + if(FXSYS_Mul(d3, d3) <= FXSYS_Mul(m_distance_tolerance_square, + FXSYS_Mul(dx, dx) + FXSYS_Mul(dy, dy))) { + m_points.add(point_type(x23, y23, path_flags_jr)); + return; + } + break; + case 2: + if(FXSYS_Mul(d2, d2) <= FXSYS_Mul(m_distance_tolerance_square, + FXSYS_Mul(dx, dx) + FXSYS_Mul(dy, dy))) { + m_points.add(point_type(x23, y23, path_flags_jr)); + return; + } + break; + case 3: + if(FXSYS_Mul(d2 + d3, d2 + d3) <= FXSYS_Mul(m_distance_tolerance_square, + FXSYS_Mul(dx, dx) + FXSYS_Mul(dy, dy))) { + m_points.add(point_type(x23, y23, path_flags_jr)); + return; + } + break; + } + recursive_bezier(x1, y1, x12, y12, x123, y123, x1234, y1234, level + 1); + recursive_bezier(x1234, y1234, x234, y234, x34, y34, x4, y4, level + 1); +} +void curve4_div::bezier(FX_FLOAT x1, FX_FLOAT y1, + FX_FLOAT x2, FX_FLOAT y2, + FX_FLOAT x3, FX_FLOAT y3, + FX_FLOAT x4, FX_FLOAT y4) +{ + m_points.add(point_type(x1, y1)); + recursive_bezier(x1, y1, x2, y2, x3, y3, x4, y4, 0); + m_points.add(point_type(x4, y4)); +} +} |