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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.
//
//----------------------------------------------------------------------------
#ifndef AGG_SPAN_PATTERN_INCLUDED
#define AGG_SPAN_PATTERN_INCLUDED
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_span_generator.h"
namespace agg
{
//---------------------------------------------------span_pattern_base
template<class ColorT, class Allocator>
class span_pattern_base : public span_generator<ColorT, Allocator>
{
public:
typedef ColorT color_type;
typedef typename ColorT::value_type value_type;
typedef Allocator alloc_type;
enum base_scale_e { base_mask = color_type::base_mask };
//----------------------------------------------------------------
span_pattern_base(alloc_type& alloc) :
span_generator<color_type, alloc_type>(alloc)
{}
//----------------------------------------------------------------
span_pattern_base(alloc_type& alloc,
const rendering_buffer& src,
unsigned offset_x, unsigned offset_y,
double alpha) :
span_generator<color_type, alloc_type>(alloc),
m_src(&src),
m_offset_x(offset_x),
m_offset_y(offset_y),
m_alpha(value_type(alpha * double(base_mask)))
{}
//----------------------------------------------------------------
const rendering_buffer& source_image() const { return *m_src; }
unsigned offset_x() const { return m_offset_x; }
unsigned offset_y() const { return m_offset_y; }
double alpha() const { return m_alpha / double(base_mask); }
value_type alpha_int() const { return m_alpha; }
//----------------------------------------------------------------
void source_image(const rendering_buffer& v) { m_src = &v; }
void offset_x(unsigned v) { m_offset_x = v; }
void offset_y(unsigned v) { m_offset_y = v; }
void alpha(double v) { m_alpha = value_type(v * double(base_mask)); }
//----------------------------------------------------------------
private:
const rendering_buffer* m_src;
unsigned m_offset_x;
unsigned m_offset_y;
value_type m_alpha;
};
//---------------------------------------------------wrap_mode_repeat
class wrap_mode_repeat
{
public:
wrap_mode_repeat(unsigned size) :
m_size(size),
m_add(size * (0x3FFFFFFF / size)),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
return m_value = (unsigned(v) + m_add) % m_size;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size) m_value = 0;
return m_value;
}
private:
unsigned m_size;
unsigned m_add;
unsigned m_value;
};
//---------------------------------------------wrap_mode_repeat_pow2
class wrap_mode_repeat_pow2
{
public:
wrap_mode_repeat_pow2(unsigned size) : m_value(0)
{
m_mask = 1;
while(m_mask < size) m_mask = (m_mask << 1) | 1;
m_mask >>= 1;
}
AGG_INLINE unsigned operator() (int v)
{
return m_value = unsigned(v) & m_mask;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value > m_mask) m_value = 0;
return m_value;
}
private:
unsigned m_mask;
unsigned m_value;
};
//----------------------------------------wrap_mode_repeat_auto_pow2
class wrap_mode_repeat_auto_pow2
{
public:
wrap_mode_repeat_auto_pow2(unsigned size) :
m_size(size),
m_add(size * (0x3FFFFFFF / size)),
m_mask((m_size & (m_size-1)) ? 0 : m_size-1),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
if(m_mask) return m_value = unsigned(v) & m_mask;
return m_value = (unsigned(v) + m_add) % m_size;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size) m_value = 0;
return m_value;
}
private:
unsigned m_size;
unsigned m_add;
unsigned m_mask;
unsigned m_value;
};
//--------------------------------------------------wrap_mode_reflect
class wrap_mode_reflect
{
public:
wrap_mode_reflect(unsigned size) :
m_size(size),
m_size2(size * 2),
m_add(m_size2 * (0x3FFFFFFF / m_size2)),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
m_value = (unsigned(v) + m_add) % m_size2;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size2) m_value = 0;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
private:
unsigned m_size;
unsigned m_size2;
unsigned m_add;
unsigned m_value;
};
//-------------------------------------------wrap_mode_reflect_pow2
class wrap_mode_reflect_pow2
{
public:
wrap_mode_reflect_pow2(unsigned size) : m_value(0)
{
m_mask = 1;
m_size = 1;
while(m_mask < size)
{
m_mask = (m_mask << 1) | 1;
m_size <<= 1;
}
}
AGG_INLINE unsigned operator() (int v)
{
m_value = unsigned(v) & m_mask;
if(m_value >= m_size) return m_mask - m_value;
return m_value;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
m_value &= m_mask;
if(m_value >= m_size) return m_mask - m_value;
return m_value;
}
private:
unsigned m_size;
unsigned m_mask;
unsigned m_value;
};
//---------------------------------------wrap_mode_reflect_auto_pow2
class wrap_mode_reflect_auto_pow2
{
public:
wrap_mode_reflect_auto_pow2(unsigned size) :
m_size(size),
m_size2(size * 2),
m_add(m_size2 * (0x3FFFFFFF / m_size2)),
m_mask((m_size2 & (m_size2-1)) ? 0 : m_size2-1),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
m_value = m_mask ? unsigned(v) & m_mask :
(unsigned(v) + m_add) % m_size2;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size2) m_value = 0;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
private:
unsigned m_size;
unsigned m_size2;
unsigned m_add;
unsigned m_mask;
unsigned m_value;
};
}
#endif
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