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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
//----------------------------------------------------------------------------
//
// Adaptation for high precision colors has been sponsored by
// Liberty Technology Systems, Inc., visit http://lib-sys.com
//
// Liberty Technology Systems, Inc. is the provider of
// PostScript and PDF technology for software developers.
//
//----------------------------------------------------------------------------
//
// color types gray8, gray16
//
//----------------------------------------------------------------------------
#ifndef AGG_COLOR_GRAY_INCLUDED
#define AGG_COLOR_GRAY_INCLUDED
#include "agg_basics.h"
#include "agg_color_rgba.h"
namespace agg
{
//===================================================================gray8
struct gray8
{
typedef int8u value_type;
typedef int32u calc_type;
typedef int32 long_type;
enum
{
base_shift = 8,
base_size = 1 << base_shift,
base_mask = base_size - 1
};
typedef gray8 self_type;
value_type v;
value_type a;
//--------------------------------------------------------------------
gray8() {}
//--------------------------------------------------------------------
gray8(unsigned v_, unsigned a_=base_mask) :
v(int8u(v_)), a(int8u(a_)) {}
//--------------------------------------------------------------------
gray8(const self_type& c, unsigned a_) :
v(c.v), a(value_type(a_)) {}
//--------------------------------------------------------------------
gray8(const rgba& c) :
v(value_type((0.299*c.r + 0.587*c.g + 0.114*c.b) * double(base_mask) + 0.5)),
a(value_type(c.a * double(base_mask))) {}
//--------------------------------------------------------------------
gray8(const rgba& c, double a_) :
v(value_type((0.299*c.r + 0.587*c.g + 0.114*c.b) * double(base_mask) + 0.5)),
a(value_type(a_ * double(base_mask))) {}
//--------------------------------------------------------------------
gray8(const rgba8& c) :
v((c.r*77 + c.g*150 + c.b*29) >> 8),
a(c.a) {}
//--------------------------------------------------------------------
gray8(const rgba8& c, unsigned a_) :
v((c.r*77 + c.g*150 + c.b*29) >> 8),
a(a_) {}
//--------------------------------------------------------------------
void clear()
{
v = a = 0;
}
//--------------------------------------------------------------------
const self_type& transparent()
{
a = 0;
return *this;
}
//--------------------------------------------------------------------
void opacity(double a_)
{
if(a_ < 0.0) a_ = 0.0;
if(a_ > 1.0) a_ = 1.0;
a = value_type(a_ * double(base_mask));
}
//--------------------------------------------------------------------
double opacity() const
{
return double(a) / double(base_mask);
}
//--------------------------------------------------------------------
const self_type& premultiply()
{
if(a == base_mask) return *this;
if(a == 0)
{
v = 0;
return *this;
}
v = value_type((calc_type(v) * a) >> base_shift);
return *this;
}
//--------------------------------------------------------------------
const self_type& premultiply(unsigned a_)
{
if(a == base_mask && a_ >= base_mask) return *this;
if(a == 0 || a_ == 0)
{
v = a = 0;
return *this;
}
calc_type v_ = (calc_type(v) * a_) / a;
v = value_type((v_ > a_) ? a_ : v_);
a = value_type(a_);
return *this;
}
//--------------------------------------------------------------------
const self_type& demultiply()
{
if(a == base_mask) return *this;
if(a == 0)
{
v = 0;
return *this;
}
calc_type v_ = (calc_type(v) * base_mask) / a;
v = value_type((v_ > base_mask) ? base_mask : v_);
return *this;
}
//--------------------------------------------------------------------
self_type gradient(self_type c, double k) const
{
self_type ret;
calc_type ik = calc_type(k * base_size);
ret.v = value_type(calc_type(v) + (((calc_type(c.v) - v) * ik) >> base_shift));
ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift));
return ret;
}
//--------------------------------------------------------------------
static self_type no_color() { return self_type(0,0); }
};
//-------------------------------------------------------------gray8_pre
inline gray8 gray8_pre(unsigned v, unsigned a = gray8::base_mask)
{
return gray8(v,a).premultiply();
}
inline gray8 gray8_pre(const gray8& c, unsigned a)
{
return gray8(c,a).premultiply();
}
inline gray8 gray8_pre(const rgba& c)
{
return gray8(c).premultiply();
}
inline gray8 gray8_pre(const rgba& c, double a)
{
return gray8(c,a).premultiply();
}
inline gray8 gray8_pre(const rgba8& c)
{
return gray8(c).premultiply();
}
inline gray8 gray8_pre(const rgba8& c, unsigned a)
{
return gray8(c,a).premultiply();
}
//==================================================================gray16
struct gray16
{
typedef int16u value_type;
typedef int32u calc_type;
typedef int64 long_type;
enum
{
base_shift = 16,
base_size = 1 << base_shift,
base_mask = base_size - 1
};
typedef gray16 self_type;
value_type v;
value_type a;
//--------------------------------------------------------------------
gray16() {}
//--------------------------------------------------------------------
gray16(unsigned v_, unsigned a_=base_mask) :
v(int16u(v_)), a(int16u(a_)) {}
//--------------------------------------------------------------------
gray16(const self_type& c, unsigned a_) :
v(c.v), a(value_type(a_)) {}
//--------------------------------------------------------------------
gray16(const rgba& c) :
v(value_type((0.299*c.r + 0.587*c.g + 0.114*c.b) * double(base_mask) + 0.5)),
a(value_type(c.a * double(base_mask))) {}
//--------------------------------------------------------------------
gray16(const rgba& c, double a_) :
v(value_type((0.299*c.r + 0.587*c.g + 0.114*c.b) * double(base_mask) + 0.5)),
a(value_type(a_ * double(base_mask))) {}
//--------------------------------------------------------------------
gray16(const rgba8& c) :
v(c.r*77 + c.g*150 + c.b*29),
a((value_type(c.a) << 8) | c.a) {}
//--------------------------------------------------------------------
gray16(const rgba8& c, unsigned a_) :
v(c.r*77 + c.g*150 + c.b*29),
a((value_type(a_) << 8) | c.a) {}
//--------------------------------------------------------------------
void clear()
{
v = a = 0;
}
//--------------------------------------------------------------------
const self_type& transparent()
{
a = 0;
return *this;
}
//--------------------------------------------------------------------
void opacity(double a_)
{
if(a_ < 0.0) a_ = 0.0;
if(a_ > 1.0) a_ = 1.0;
a = value_type(a_ * double(base_mask));
}
//--------------------------------------------------------------------
double opacity() const
{
return double(a) / double(base_mask);
}
//--------------------------------------------------------------------
const self_type& premultiply()
{
if(a == base_mask) return *this;
if(a == 0)
{
v = 0;
return *this;
}
v = value_type((calc_type(v) * a) >> base_shift);
return *this;
}
//--------------------------------------------------------------------
const self_type& premultiply(unsigned a_)
{
if(a == base_mask && a_ >= base_mask) return *this;
if(a == 0 || a_ == 0)
{
v = a = 0;
return *this;
}
calc_type v_ = (calc_type(v) * a_) / a;
v = value_type((v_ > a_) ? a_ : v_);
a = value_type(a_);
return *this;
}
//--------------------------------------------------------------------
const self_type& demultiply()
{
if(a == base_mask) return *this;
if(a == 0)
{
v = 0;
return *this;
}
calc_type v_ = (calc_type(v) * base_mask) / a;
v = value_type((v_ > base_mask) ? base_mask : v_);
return *this;
}
//--------------------------------------------------------------------
self_type gradient(self_type c, double k) const
{
self_type ret;
calc_type ik = calc_type(k * base_size);
ret.v = value_type(calc_type(v) + (((calc_type(c.v) - v) * ik) >> base_shift));
ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift));
return ret;
}
//--------------------------------------------------------------------
static self_type no_color() { return self_type(0,0); }
};
//------------------------------------------------------------gray16_pre
inline gray16 gray16_pre(unsigned v, unsigned a = gray16::base_mask)
{
return gray16(v,a).premultiply();
}
inline gray16 gray16_pre(const gray16& c, unsigned a)
{
return gray16(c,a).premultiply();
}
inline gray16 gray16_pre(const rgba& c)
{
return gray16(c).premultiply();
}
inline gray16 gray16_pre(const rgba& c, double a)
{
return gray16(c,a).premultiply();
}
inline gray16 gray16_pre(const rgba8& c)
{
return gray16(c).premultiply();
}
inline gray16 gray16_pre(const rgba8& c, unsigned a)
{
return gray16(c,a).premultiply();
}
}
#endif
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