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agg_span_image_filter_gray.h
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agg_span_image_filter_gray.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
//----------------------------------------------------------------------------
//
// 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_IMAGE_FILTER_GRAY_INCLUDED
#define AGG_SPAN_IMAGE_FILTER_GRAY_INCLUDED
#include "agg_basics.h"
#include "agg_color_gray.h"
#include "agg_span_image_filter.h"
namespace agg
{
//==============================================span_image_filter_gray_nn
template<class Source, class Interpolator>
class span_image_filter_gray_nn :
public span_image_filter<Source, Interpolator>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef Interpolator interpolator_type;
typedef span_image_filter<source_type, interpolator_type> base_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask
};
//--------------------------------------------------------------------
span_image_filter_gray_nn() {}
span_image_filter_gray_nn(source_type& src,
interpolator_type& inter) :
base_type(src, inter, 0)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
do
{
base_type::interpolator().coordinates(&x, &y);
span->v = *(const value_type*)
base_type::source().span(x >> image_subpixel_shift,
y >> image_subpixel_shift,
1);
span->a = base_mask;
++span;
++base_type::interpolator();
} while(--len);
}
};
//=========================================span_image_filter_gray_bilinear
template<class Source, class Interpolator>
class span_image_filter_gray_bilinear :
public span_image_filter<Source, Interpolator>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef Interpolator interpolator_type;
typedef span_image_filter<source_type, interpolator_type> base_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask
};
//--------------------------------------------------------------------
span_image_filter_gray_bilinear() {}
span_image_filter_gray_bilinear(source_type& src,
interpolator_type& inter) :
base_type(src, inter, 0)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
calc_type fg;
const value_type *fg_ptr;
do
{
int x_hr;
int y_hr;
base_type::interpolator().coordinates(&x_hr, &y_hr);
x_hr -= base_type::filter_dx_int();
y_hr -= base_type::filter_dy_int();
int x_lr = x_hr >> image_subpixel_shift;
int y_lr = y_hr >> image_subpixel_shift;
fg = image_subpixel_scale * image_subpixel_scale / 2;
x_hr &= image_subpixel_mask;
y_hr &= image_subpixel_mask;
fg_ptr = (const value_type*)base_type::source().span(x_lr, y_lr, 2);
fg += *fg_ptr * (image_subpixel_scale - x_hr) * (image_subpixel_scale - y_hr);
fg_ptr = (const value_type*)base_type::source().next_x();
fg += *fg_ptr * x_hr * (image_subpixel_scale - y_hr);
fg_ptr = (const value_type*)base_type::source().next_y();
fg += *fg_ptr * (image_subpixel_scale - x_hr) * y_hr;
fg_ptr = (const value_type*)base_type::source().next_x();
fg += *fg_ptr * x_hr * y_hr;
span->v = value_type(fg >> (image_subpixel_shift * 2));
span->a = base_mask;
++span;
++base_type::interpolator();
} while(--len);
}
};
//====================================span_image_filter_gray_bilinear_clip
template<class Source, class Interpolator>
class span_image_filter_gray_bilinear_clip :
public span_image_filter<Source, Interpolator>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef Interpolator interpolator_type;
typedef span_image_filter<source_type, interpolator_type> base_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask
};
//--------------------------------------------------------------------
span_image_filter_gray_bilinear_clip() {}
span_image_filter_gray_bilinear_clip(source_type& src,
const color_type& back_color,
interpolator_type& inter) :
base_type(src, inter, 0),
m_back_color(back_color)
{}
const color_type& background_color() const { return m_back_color; }
void background_color(const color_type& v) { m_back_color = v; }
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
calc_type fg;
calc_type src_alpha;
value_type back_v = m_back_color.v;
value_type back_a = m_back_color.a;
const value_type *fg_ptr;
int maxx = base_type::source().width() - 1;
int maxy = base_type::source().height() - 1;
do
{
int x_hr;
int y_hr;
base_type::interpolator().coordinates(&x_hr, &y_hr);
x_hr -= base_type::filter_dx_int();
y_hr -= base_type::filter_dy_int();
int x_lr = x_hr >> image_subpixel_shift;
int y_lr = y_hr >> image_subpixel_shift;
if(x_lr >= 0 && y_lr >= 0 &&
x_lr < maxx && y_lr < maxy)
{
fg = image_subpixel_scale * image_subpixel_scale / 2;
x_hr &= image_subpixel_mask;
y_hr &= image_subpixel_mask;
fg_ptr = (const value_type*)base_type::source().row_ptr(y_lr) + x_lr;
fg += *fg_ptr++ * (image_subpixel_scale - x_hr) * (image_subpixel_scale - y_hr);
fg += *fg_ptr++ * (image_subpixel_scale - y_hr) * x_hr;
++y_lr;
fg_ptr = (const value_type*)base_type::source().row_ptr(y_lr) + x_lr;
fg += *fg_ptr++ * (image_subpixel_scale - x_hr) * y_hr;
fg += *fg_ptr++ * x_hr * y_hr;
fg >>= image_subpixel_shift * 2;
src_alpha = base_mask;
}
else
{
unsigned weight;
if(x_lr < -1 || y_lr < -1 ||
x_lr > maxx || y_lr > maxy)
{
fg = back_v;
src_alpha = back_a;
}
else
{
fg =
src_alpha = image_subpixel_scale * image_subpixel_scale / 2;
x_hr &= image_subpixel_mask;
y_hr &= image_subpixel_mask;
weight = (image_subpixel_scale - x_hr) *
(image_subpixel_scale - y_hr);
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg += weight *
*((const value_type*)base_type::source().row_ptr(y_lr) + x_lr);
src_alpha += weight * base_mask;
}
else
{
fg += back_v * weight;
src_alpha += back_a * weight;
}
x_lr++;
weight = x_hr * (image_subpixel_scale - y_hr);
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg += weight *
*((const value_type*)base_type::source().row_ptr(y_lr) + x_lr);
src_alpha += weight * base_mask;
}
else
{
fg += back_v * weight;
src_alpha += back_a * weight;
}
x_lr--;
y_lr++;
weight = (image_subpixel_scale - x_hr) * y_hr;
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg += weight *
*((const value_type*)base_type::source().row_ptr(y_lr) + x_lr);
src_alpha += weight * base_mask;
}
else
{
fg += back_v * weight;
src_alpha += back_a * weight;
}
x_lr++;
weight = x_hr * y_hr;
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg += weight *
*((const value_type*)base_type::source().row_ptr(y_lr) + x_lr);
src_alpha += weight * base_mask;
}
else
{
fg += back_v * weight;
src_alpha += back_a * weight;
}
fg >>= image_subpixel_shift * 2;
src_alpha >>= image_subpixel_shift * 2;
}
}
span->v = (value_type)fg;
span->a = (value_type)src_alpha;
++span;
++base_type::interpolator();
} while(--len);
}
private:
color_type m_back_color;
};
//==============================================span_image_filter_gray_2x2
template<class Source, class Interpolator>
class span_image_filter_gray_2x2 :
public span_image_filter<Source, Interpolator>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef Interpolator interpolator_type;
typedef span_image_filter<source_type, interpolator_type> base_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask
};
//--------------------------------------------------------------------
span_image_filter_gray_2x2() {}
span_image_filter_gray_2x2(source_type& src,
interpolator_type& inter,
const image_filter_lut& filter) :
base_type(src, inter, &filter)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
calc_type fg;
const value_type *fg_ptr;
const int16* weight_array = base_type::filter().weight_array() +
((base_type::filter().diameter()/2 - 1) <<
image_subpixel_shift);
do
{
int x_hr;
int y_hr;
base_type::interpolator().coordinates(&x_hr, &y_hr);
x_hr -= base_type::filter_dx_int();
y_hr -= base_type::filter_dy_int();
int x_lr = x_hr >> image_subpixel_shift;
int y_lr = y_hr >> image_subpixel_shift;
unsigned weight;
fg = image_filter_scale / 2;
x_hr &= image_subpixel_mask;
y_hr &= image_subpixel_mask;
fg_ptr = (const value_type*)base_type::source().span(x_lr, y_lr, 2);
weight = (weight_array[x_hr + image_subpixel_scale] *
weight_array[y_hr + image_subpixel_scale] +
image_filter_scale / 2) >>
image_filter_shift;
fg += weight * *fg_ptr;
fg_ptr = (const value_type*)base_type::source().next_x();
weight = (weight_array[x_hr] *
weight_array[y_hr + image_subpixel_scale] +
image_filter_scale / 2) >>
image_filter_shift;
fg += weight * *fg_ptr;
fg_ptr = (const value_type*)base_type::source().next_y();
weight = (weight_array[x_hr + image_subpixel_scale] *
weight_array[y_hr] +
image_filter_scale / 2) >>
image_filter_shift;
fg += weight * *fg_ptr;
fg_ptr = (const value_type*)base_type::source().next_x();
weight = (weight_array[x_hr] *
weight_array[y_hr] +
image_filter_scale / 2) >>
image_filter_shift;
fg += weight * *fg_ptr;
fg >>= image_filter_shift;
if(fg > base_mask) fg = base_mask;
span->v = (value_type)fg;
span->a = base_mask;
++span;
++base_type::interpolator();
} while(--len);
}
};
//==================================================span_image_filter_gray
template<class Source, class Interpolator>
class span_image_filter_gray :
public span_image_filter<Source, Interpolator>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef Interpolator interpolator_type;
typedef span_image_filter<source_type, interpolator_type> base_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask
};
//--------------------------------------------------------------------
span_image_filter_gray() {}
span_image_filter_gray(source_type& src,
interpolator_type& inter,
const image_filter_lut& filter) :
base_type(src, inter, &filter)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
int fg;
const value_type *fg_ptr;
unsigned diameter = base_type::filter().diameter();
int start = base_type::filter().start();
const int16* weight_array = base_type::filter().weight_array();
int x_count;
int weight_y;
do
{
base_type::interpolator().coordinates(&x, &y);
x -= base_type::filter_dx_int();
y -= base_type::filter_dy_int();
int x_hr = x;
int y_hr = y;
int x_lr = x_hr >> image_subpixel_shift;
int y_lr = y_hr >> image_subpixel_shift;
fg = image_filter_scale / 2;
int x_fract = x_hr & image_subpixel_mask;
unsigned y_count = diameter;
y_hr = image_subpixel_mask - (y_hr & image_subpixel_mask);
fg_ptr = (const value_type*)base_type::source().span(x_lr + start,
y_lr + start,
diameter);
for(;;)
{
x_count = diameter;
weight_y = weight_array[y_hr];
x_hr = image_subpixel_mask - x_fract;
for(;;)
{
fg += *fg_ptr *
((weight_y * weight_array[x_hr] +
image_filter_scale / 2) >>
image_filter_shift);
if(--x_count == 0) break;
x_hr += image_subpixel_scale;
fg_ptr = (const value_type*)base_type::source().next_x();
}
if(--y_count == 0) break;
y_hr += image_subpixel_scale;
fg_ptr = (const value_type*)base_type::source().next_y();
}
fg >>= image_filter_shift;
if(fg < 0) fg = 0;
if(fg > base_mask) fg = base_mask;
span->v = (value_type)fg;
span->a = base_mask;
++span;
++base_type::interpolator();
} while(--len);
}
};
//=========================================span_image_resample_gray_affine
template<class Source>
class span_image_resample_gray_affine :
public span_image_resample_affine<Source>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef span_image_resample_affine<source_type> base_type;
typedef typename base_type::interpolator_type interpolator_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::long_type long_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask,
downscale_shift = image_filter_shift
};
//--------------------------------------------------------------------
span_image_resample_gray_affine() {}
span_image_resample_gray_affine(source_type& src,
interpolator_type& inter,
const image_filter_lut& filter) :
base_type(src, inter, filter)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
long_type fg;
int diameter = base_type::filter().diameter();
int filter_scale = diameter << image_subpixel_shift;
int radius_x = (diameter * base_type::m_rx) >> 1;
int radius_y = (diameter * base_type::m_ry) >> 1;
int len_x_lr =
(diameter * base_type::m_rx + image_subpixel_mask) >>
image_subpixel_shift;
const int16* weight_array = base_type::filter().weight_array();
do
{
base_type::interpolator().coordinates(&x, &y);
x += base_type::filter_dx_int() - radius_x;
y += base_type::filter_dy_int() - radius_y;
fg = image_filter_scale / 2;
int y_lr = y >> image_subpixel_shift;
int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) *
base_type::m_ry_inv) >>
image_subpixel_shift;
int total_weight = 0;
int x_lr = x >> image_subpixel_shift;
int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) *
base_type::m_rx_inv) >>
image_subpixel_shift;
int x_hr2 = x_hr;
const value_type* fg_ptr =
(const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
for(;;)
{
int weight_y = weight_array[y_hr];
x_hr = x_hr2;
for(;;)
{
int weight = (weight_y * weight_array[x_hr] +
image_filter_scale / 2) >>
downscale_shift;
fg += *fg_ptr * weight;
total_weight += weight;
x_hr += base_type::m_rx_inv;
if(x_hr >= filter_scale) break;
fg_ptr = (const value_type*)base_type::source().next_x();
}
y_hr += base_type::m_ry_inv;
if(y_hr >= filter_scale) break;
fg_ptr = (const value_type*)base_type::source().next_y();
}
fg /= total_weight;
if(fg < 0) fg = 0;
if(fg > base_mask) fg = base_mask;
span->v = (value_type)fg;
span->a = base_mask;
++span;
++base_type::interpolator();
} while(--len);
}
};
//================================================span_image_resample_gray
template<class Source, class Interpolator>
class span_image_resample_gray :
public span_image_resample<Source, Interpolator>
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef Interpolator interpolator_type;
typedef span_image_resample<source_type, interpolator_type> base_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::long_type long_type;
enum base_scale_e
{
base_shift = color_type::base_shift,
base_mask = color_type::base_mask,
downscale_shift = image_filter_shift
};
//--------------------------------------------------------------------
span_image_resample_gray() {}
span_image_resample_gray(source_type& src,
interpolator_type& inter,
const image_filter_lut& filter) :
base_type(src, inter, filter)
{}
//--------------------------------------------------------------------
void generate(color_type* span, int x, int y, unsigned len)
{
base_type::interpolator().begin(x + base_type::filter_dx_dbl(),
y + base_type::filter_dy_dbl(), len);
long_type fg;
int diameter = base_type::filter().diameter();
int filter_scale = diameter << image_subpixel_shift;
const int16* weight_array = base_type::filter().weight_array();
do
{
int rx;
int ry;
int rx_inv = image_subpixel_scale;
int ry_inv = image_subpixel_scale;
base_type::interpolator().coordinates(&x, &y);
base_type::interpolator().local_scale(&rx, &ry);
base_type::adjust_scale(&rx, &ry);
rx_inv = image_subpixel_scale * image_subpixel_scale / rx;
ry_inv = image_subpixel_scale * image_subpixel_scale / ry;
int radius_x = (diameter * rx) >> 1;
int radius_y = (diameter * ry) >> 1;
int len_x_lr =
(diameter * rx + image_subpixel_mask) >>
image_subpixel_shift;
x += base_type::filter_dx_int() - radius_x;
y += base_type::filter_dy_int() - radius_y;
fg = image_filter_scale / 2;
int y_lr = y >> image_subpixel_shift;
int y_hr = ((image_subpixel_mask - (y & image_subpixel_mask)) *
ry_inv) >>
image_subpixel_shift;
int total_weight = 0;
int x_lr = x >> image_subpixel_shift;
int x_hr = ((image_subpixel_mask - (x & image_subpixel_mask)) *
rx_inv) >>
image_subpixel_shift;
int x_hr2 = x_hr;
const value_type* fg_ptr =
(const value_type*)base_type::source().span(x_lr, y_lr, len_x_lr);
for(;;)
{
int weight_y = weight_array[y_hr];
x_hr = x_hr2;
for(;;)
{
int weight = (weight_y * weight_array[x_hr] +
image_filter_scale / 2) >>
downscale_shift;
fg += *fg_ptr * weight;
total_weight += weight;
x_hr += rx_inv;
if(x_hr >= filter_scale) break;
fg_ptr = (const value_type*)base_type::source().next_x();
}
y_hr += ry_inv;
if(y_hr >= filter_scale) break;
fg_ptr = (const value_type*)base_type::source().next_y();
}
fg /= total_weight;
if(fg < 0) fg = 0;
if(fg > base_mask) fg = base_mask;
span->v = (value_type)fg;
span->a = base_mask;
++span;
++base_type::interpolator();
} while(--len);
}
};
}
#endif