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diff --git a/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_span_gradient.h b/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_span_gradient.h
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+//----------------------------------------------------------------------------
+// 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_SPAN_GRADIENT_INCLUDED
+#define AGG_SPAN_GRADIENT_INCLUDED
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include "agg_basics.h"
+#include "agg_math.h"
+#include "agg_array.h"
+
+
+namespace agg
+{
+
+    enum gradient_subpixel_scale_e
+    {
+        gradient_subpixel_shift = 4,                              //-----gradient_subpixel_shift
+        gradient_subpixel_scale = 1 << gradient_subpixel_shift,   //-----gradient_subpixel_scale
+        gradient_subpixel_mask  = gradient_subpixel_scale - 1     //-----gradient_subpixel_mask
+    };
+
+
+
+    //==========================================================span_gradient
+    template<class ColorT,
+             class Interpolator,
+             class GradientF, 
+             class ColorF>
+    class span_gradient
+    {
+    public:
+        typedef Interpolator interpolator_type;
+        typedef ColorT color_type;
+
+        enum downscale_shift_e
+        {
+            downscale_shift = interpolator_type::subpixel_shift - 
+                              gradient_subpixel_shift
+        };
+
+        //--------------------------------------------------------------------
+        span_gradient() {}
+
+        //--------------------------------------------------------------------
+        span_gradient(interpolator_type& inter,
+                      GradientF& gradient_function,
+                      ColorF& color_function,
+                      double d1, double d2) : 
+            m_interpolator(&inter),
+            m_gradient_function(&gradient_function),
+            m_color_function(&color_function),
+            m_d1(iround(d1 * gradient_subpixel_scale)),
+            m_d2(iround(d2 * gradient_subpixel_scale))
+        {}
+
+        //--------------------------------------------------------------------
+        interpolator_type& interpolator() { return *m_interpolator; }
+        const GradientF& gradient_function() const { return *m_gradient_function; }
+        const ColorF& color_function() const { return *m_color_function; }
+        double d1() const { return double(m_d1) / gradient_subpixel_scale; }
+        double d2() const { return double(m_d2) / gradient_subpixel_scale; }
+
+        //--------------------------------------------------------------------
+        void interpolator(interpolator_type& i) { m_interpolator = &i; }
+        void gradient_function(GradientF& gf) { m_gradient_function = &gf; }
+        void color_function(ColorF& cf) { m_color_function = &cf; }
+        void d1(double v) { m_d1 = iround(v * gradient_subpixel_scale); }
+        void d2(double v) { m_d2 = iround(v * gradient_subpixel_scale); }
+
+        //--------------------------------------------------------------------
+        void prepare() {}
+
+        //--------------------------------------------------------------------
+        void generate(color_type* span, int x, int y, unsigned len)
+        {   
+            int dd = m_d2 - m_d1;
+            if(dd < 1) dd = 1;
+            m_interpolator->begin(x+0.5, y+0.5, len);
+            do
+            {
+                m_interpolator->coordinates(&x, &y);
+                int d = m_gradient_function->calculate(x >> downscale_shift, 
+                                                       y >> downscale_shift, m_d2);
+                d = ((d - m_d1) * (int)m_color_function->size()) / dd;
+                if(d < 0) d = 0;
+                if(d >= (int)m_color_function->size()) d = m_color_function->size() - 1;
+                *span++ = (*m_color_function)[d];
+                ++(*m_interpolator);
+            }
+            while(--len);
+        }
+
+    private:
+        interpolator_type* m_interpolator;
+        GradientF*         m_gradient_function;
+        ColorF*            m_color_function;
+        int                m_d1;
+        int                m_d2;
+    };
+
+
+
+
+    //=====================================================gradient_linear_color
+    template<class ColorT> 
+    struct gradient_linear_color
+    {
+        typedef ColorT color_type;
+
+        gradient_linear_color() {}
+        gradient_linear_color(const color_type& c1, const color_type& c2, 
+                              unsigned size = 256) :
+            m_c1(c1), m_c2(c2), m_size(size)
+				// VFALCO 4/28/09
+				,m_mult(1/(double(size)-1))
+				// VFALCO
+			{}
+
+        unsigned size() const { return m_size; }
+        color_type operator [] (unsigned v) const 
+        {
+			// VFALCO 4/28/09 
+            //return m_c1.gradient(m_c2, double(v) / double(m_size - 1));
+            return m_c1.gradient(m_c2, double(v) * m_mult );
+			// VFALCO
+        }
+
+        void colors(const color_type& c1, const color_type& c2, unsigned size = 256)
+        {
+            m_c1 = c1;
+            m_c2 = c2;
+            m_size = size;
+			// VFALCO 4/28/09
+			m_mult=1/(double(size)-1);
+			// VFALCO
+        }
+
+        color_type m_c1;
+        color_type m_c2;
+        unsigned m_size;
+		// VFALCO 4/28/09
+		double m_mult;
+		// VFALCO
+    };
+
+
+
+
+
+
+    //==========================================================gradient_circle
+    class gradient_circle
+    {
+        // Actually the same as radial. Just for compatibility
+    public:
+        static AGG_INLINE int calculate(int x, int y, int)
+        {
+            return int(fast_sqrt(x*x + y*y));
+        }
+    };
+
+
+    //==========================================================gradient_radial
+    class gradient_radial
+    {
+    public:
+        static AGG_INLINE int calculate(int x, int y, int)
+        {
+            return int(fast_sqrt(x*x + y*y));
+        }
+    };
+
+    //========================================================gradient_radial_d
+    class gradient_radial_d
+    {
+    public:
+        static AGG_INLINE int calculate(int x, int y, int)
+        {
+            return uround(sqrt(double(x)*double(x) + double(y)*double(y)));
+        }
+    };
+
+    //====================================================gradient_radial_focus
+    class gradient_radial_focus
+    {
+    public:
+        //---------------------------------------------------------------------
+        gradient_radial_focus() : 
+            m_r(100 * gradient_subpixel_scale), 
+            m_fx(0), 
+            m_fy(0)
+        {
+            update_values();
+        }
+
+        //---------------------------------------------------------------------
+        gradient_radial_focus(double r, double fx, double fy) : 
+            m_r (iround(r  * gradient_subpixel_scale)), 
+            m_fx(iround(fx * gradient_subpixel_scale)), 
+            m_fy(iround(fy * gradient_subpixel_scale))
+        {
+            update_values();
+        }
+
+        //---------------------------------------------------------------------
+        void init(double r, double fx, double fy)
+        {
+            m_r  = iround(r  * gradient_subpixel_scale);
+            m_fx = iround(fx * gradient_subpixel_scale);
+            m_fy = iround(fy * gradient_subpixel_scale);
+            update_values();
+        }
+
+        //---------------------------------------------------------------------
+        double radius()  const { return double(m_r)  / gradient_subpixel_scale; }
+        double focus_x() const { return double(m_fx) / gradient_subpixel_scale; }
+        double focus_y() const { return double(m_fy) / gradient_subpixel_scale; }
+
+        //---------------------------------------------------------------------
+        int calculate(int x, int y, int) const
+        {
+            double dx = x - m_fx;
+            double dy = y - m_fy;
+            double d2 = dx * m_fy - dy * m_fx;
+            double d3 = m_r2 * (dx * dx + dy * dy) - d2 * d2;
+            return iround((dx * m_fx + dy * m_fy + sqrt(fabs(d3))) * m_mul);
+        }
+
+    private:
+        //---------------------------------------------------------------------
+        void update_values()
+        {
+            // Calculate the invariant values. In case the focal center
+            // lies exactly on the gradient circle the divisor degenerates
+            // into zero. In this case we just move the focal center by
+            // one subpixel unit possibly in the direction to the origin (0,0)
+            // and calculate the values again.
+            //-------------------------
+            m_r2  = double(m_r)  * double(m_r);
+            m_fx2 = double(m_fx) * double(m_fx);
+            m_fy2 = double(m_fy) * double(m_fy);
+            double d = (m_r2 - (m_fx2 + m_fy2));
+            if(d == 0)
+            {
+                if(m_fx) { if(m_fx < 0) ++m_fx; else --m_fx; }
+                if(m_fy) { if(m_fy < 0) ++m_fy; else --m_fy; }
+                m_fx2 = double(m_fx) * double(m_fx);
+                m_fy2 = double(m_fy) * double(m_fy);
+                d = (m_r2 - (m_fx2 + m_fy2));
+            }
+            m_mul = m_r / d;
+        }
+
+        int    m_r;
+        int    m_fx;
+        int    m_fy;
+        double m_r2;
+        double m_fx2;
+        double m_fy2;
+        double m_mul;
+    };
+
+
+    //==============================================================gradient_x
+    class gradient_x
+    {
+    public:
+        static int calculate(int x, int, int) { return x; }
+    };
+
+
+    //==============================================================gradient_y
+    class gradient_y
+    {
+    public:
+        static int calculate(int, int y, int) { return y; }
+    };
+
+    //========================================================gradient_diamond
+    class gradient_diamond
+    {
+    public:
+        static AGG_INLINE int calculate(int x, int y, int) 
+        { 
+            int ax = abs(x);
+            int ay = abs(y);
+            return ax > ay ? ax : ay; 
+        }
+    };
+
+    //=============================================================gradient_xy
+    class gradient_xy
+    {
+    public:
+        static AGG_INLINE int calculate(int x, int y, int d) 
+        { 
+            return abs(x) * abs(y) / d; 
+        }
+    };
+
+    //========================================================gradient_sqrt_xy
+    class gradient_sqrt_xy
+    {
+    public:
+        static AGG_INLINE int calculate(int x, int y, int) 
+        { 
+            return fast_sqrt(abs(x) * abs(y)); 
+        }
+    };
+
+    //==========================================================gradient_conic
+    class gradient_conic
+    {
+    public:
+        static AGG_INLINE int calculate(int x, int y, int d) 
+        { 
+            return uround(fabs(atan2(double(y), double(x))) * double(d) / pi);
+        }
+    };
+
+    //=================================================gradient_repeat_adaptor
+    template<class GradientF> class gradient_repeat_adaptor
+    {
+    public:
+        gradient_repeat_adaptor(const GradientF& gradient) : 
+            m_gradient(&gradient) {}
+
+        AGG_INLINE int calculate(int x, int y, int d) const
+        {
+            int ret = m_gradient->calculate(x, y, d) % d;
+            if(ret < 0) ret += d;
+            return ret;
+        }
+
+    private:
+        const GradientF* m_gradient;
+    };
+
+    //================================================gradient_reflect_adaptor
+    template<class GradientF> class gradient_reflect_adaptor
+    {
+    public:
+        gradient_reflect_adaptor(const GradientF& gradient) : 
+            m_gradient(&gradient) {}
+
+        AGG_INLINE int calculate(int x, int y, int d) const
+        {
+            int d2 = d << 1;
+            int ret = m_gradient->calculate(x, y, d) % d2;
+            if(ret <  0) ret += d2;
+            if(ret >= d) ret  = d2 - ret;
+            return ret;
+        }
+
+    private:
+        const GradientF* m_gradient;
+    };
+
+
+}
+
+#endif