From b7d358b498800e4c240d381fa6f098af17a4d95b Mon Sep 17 00:00:00 2001 From: Tom Sepez Date: Wed, 17 Jun 2015 10:01:00 -0700 Subject: Merge to XFA: Separate agg-authored code from fx-authored code. Original Review URL: https://codereview.chromium.org/1152743007. BUG=pdfium:166 R=brucedawson@chromium.org, thestig@chromium.org TBR=brucedawson@chromium.org, thestig@chromium.org Review URL: https://codereview.chromium.org/1186423003. --- third_party/agg23/agg_math.h | 63 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 third_party/agg23/agg_math.h (limited to 'third_party/agg23/agg_math.h') diff --git a/third_party/agg23/agg_math.h b/third_party/agg23/agg_math.h new file mode 100644 index 0000000000..31e0daf3bb --- /dev/null +++ b/third_party/agg23/agg_math.h @@ -0,0 +1,63 @@ + +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// Bessel function (besj) was adapted for use in AGG library by Andy Wilk +// Contact: castor.vulgaris@gmail.com +//---------------------------------------------------------------------------- +#ifndef AGG_MATH_INCLUDED +#define AGG_MATH_INCLUDED +#include "agg_basics.h" +namespace agg +{ +const FX_FLOAT intersection_epsilon = 1.0e-30f; +AGG_INLINE FX_FLOAT calc_point_location(FX_FLOAT x1, FX_FLOAT y1, + FX_FLOAT x2, FX_FLOAT y2, + FX_FLOAT x, FX_FLOAT y) +{ + return FXSYS_Mul(x - x2, y2 - y1) - FXSYS_Mul(y - y2, x2 - x1); +} +AGG_INLINE FX_FLOAT calc_distance(FX_FLOAT x1, FX_FLOAT y1, FX_FLOAT x2, FX_FLOAT y2) +{ + FX_FLOAT dx = x2 - x1; + FX_FLOAT dy = y2 - y1; + return FXSYS_sqrt2(dx, dy); +} +AGG_INLINE FX_FLOAT calc_line_point_distance(FX_FLOAT x1, FX_FLOAT y1, + FX_FLOAT x2, FX_FLOAT y2, + FX_FLOAT x, FX_FLOAT y) +{ + FX_FLOAT dx = x2 - x1; + FX_FLOAT dy = y2 - y1; + FX_FLOAT d = FXSYS_sqrt2(dx, dy); + if(d < intersection_epsilon) { + return calc_distance(x1, y1, x, y); + } + return FXSYS_MulDiv(x - x2, dy, d) - FXSYS_MulDiv(y - y2, dx, d); +} +AGG_INLINE bool calc_intersection(FX_FLOAT ax, FX_FLOAT ay, FX_FLOAT bx, FX_FLOAT by, + FX_FLOAT cx, FX_FLOAT cy, FX_FLOAT dx, FX_FLOAT dy, + FX_FLOAT* x, FX_FLOAT* y) +{ + FX_FLOAT num = FXSYS_Mul(ay - cy, dx - cx) - FXSYS_Mul(ax - cx, dy - cy); + FX_FLOAT den = FXSYS_Mul(bx - ax, dy - cy) - FXSYS_Mul(by - ay, dx - cx); + if (FXSYS_fabs(den) < intersection_epsilon) { + return false; + } + *x = ax + FXSYS_MulDiv(bx - ax, num, den); + *y = ay + FXSYS_MulDiv(by - ay, num, den); + return true; +} +} +#endif -- cgit v1.2.3