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-rwxr-xr-xagg/inc/agg_gamma_functions.h123
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diff --git a/agg/inc/agg_gamma_functions.h b/agg/inc/agg_gamma_functions.h
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--- a/agg/inc/agg_gamma_functions.h
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-//----------------------------------------------------------------------------
-// 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
-//----------------------------------------------------------------------------
-
-#ifndef AGG_GAMMA_FUNCTIONS_INCLUDED
-#define AGG_GAMMA_FUNCTIONS_INCLUDED
-
-#include <math.h>
-#include "agg_basics.h"
-
-namespace agg
-{
- //===============================================================gamma_none
- struct gamma_none
- {
- double operator()(double x) const { return x; }
- };
-
-
- //==============================================================gamma_power
- class gamma_power
- {
- public:
- gamma_power() : m_gamma(1.0) {}
- gamma_power(double g) : m_gamma(g) {}
-
- void gamma(double g) { m_gamma = g; }
- double gamma() const { return m_gamma; }
-
- double operator() (double x) const
- {
- return pow(x, m_gamma);
- }
-
- private:
- double m_gamma;
- };
-
-
- //==========================================================gamma_threshold
- class gamma_threshold
- {
- public:
- gamma_threshold() : m_threshold(0.5) {}
- gamma_threshold(double t) : m_threshold(t) {}
-
- void threshold(double t) { m_threshold = t; }
- double threshold() const { return m_threshold; }
-
- double operator() (double x) const
- {
- return (x < m_threshold) ? 0.0 : 1.0;
- }
-
- private:
- double m_threshold;
- };
-
-
- //============================================================gamma_linear
- class gamma_linear
- {
- public:
- gamma_linear() : m_start(0.0), m_end(1.0) {}
- gamma_linear(double s, double e) : m_start(s), m_end(e) {}
-
- void set(double s, double e) { m_start = s; m_end = e; }
- void start(double s) { m_start = s; }
- void end(double e) { m_end = e; }
- double start() const { return m_start; }
- double end() const { return m_end; }
-
- double operator() (double x) const
- {
- if(x < m_start) return 0.0;
- if(x > m_end) return 1.0;
- return (x - m_start) / (m_end - m_start);
- }
-
- private:
- double m_start;
- double m_end;
- };
-
-
- //==========================================================gamma_multiply
- class gamma_multiply
- {
- public:
- gamma_multiply() : m_mul(1.0) {}
- gamma_multiply(double v) : m_mul(v) {}
-
- void value(double v) { m_mul = v; }
- double value() const { return m_mul; }
-
- double operator() (double x) const
- {
- double y = x * m_mul;
- if(y > 1.0) y = 1.0;
- return y;
- }
-
- private:
- double m_mul;
- };
-
-}
-
-#endif
-
-
-