/
agg_span_image_filter_rgb24.h
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agg_span_image_filter_rgb24.h
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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.2
// Copyright (C) 2002-2004 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_IMAGE_FILTER_RGB24_INCLUDED
#define AGG_SPAN_IMAGE_FILTER_RGB24_INCLUDED
#include "agg_basics.h"
#include "agg_color_rgba8.h"
#include "agg_span_image_filter.h"
namespace agg
{
//==============================================span_image_filter_rgb24_nn
template<class Order,
class Interpolator,
class Allocator = span_allocator<rgba8> >
class span_image_filter_rgb24_nn :
public span_image_filter<rgba8, Interpolator, Allocator>
{
public:
typedef Interpolator interpolator_type;
typedef Allocator alloc_type;
typedef span_image_filter<rgba8, Interpolator, alloc_type> base_type;
typedef rgba8 color_type;
//--------------------------------------------------------------------
span_image_filter_rgb24_nn(alloc_type& alloc) : base_type(alloc) {}
//--------------------------------------------------------------------
span_image_filter_rgb24_nn(alloc_type& alloc,
const rendering_buffer& src,
const color_type& back_color,
interpolator_type& inter) :
base_type(alloc, src, back_color, inter, 0)
{}
//--------------------------------------------------------------------
color_type* generate(int x, int y, unsigned len)
{
base_type::interpolator().begin(x, y, len);
int fg[3];
int src_alpha;
const unsigned char *fg_ptr;
color_type* span = base_type::allocator().span();
int maxx = base_type::source_image().width() - 1;
int maxy = base_type::source_image().height() - 1;
do
{
base_type::interpolator().coordinates(&x, &y);
x >>= image_subpixel_shift;
y >>= image_subpixel_shift;
if(x >= 0 && y >= 0 &&
x <= maxx && y <= maxy)
{
fg_ptr = base_type::source_image().row(y) + x + x + x;
fg[0] = *fg_ptr++;
fg[1] = *fg_ptr++;
fg[2] = *fg_ptr++;
src_alpha = 255;
}
else
{
fg[Order::R] = base_type::background_color().r;
fg[Order::G] = base_type::background_color().g;
fg[Order::B] = base_type::background_color().b;
src_alpha = base_type::background_color().a;
}
span->r = (int8u)fg[Order::R];
span->g = (int8u)fg[Order::G];
span->b = (int8u)fg[Order::B];
span->a = (int8u)src_alpha;
++span;
++base_type::interpolator();
} while(--len);
return base_type::allocator().span();
}
};
//=========================================span_image_filter_rgb24_bilinear
template<class Order,
class Interpolator,
class Allocator = span_allocator<rgba8> >
class span_image_filter_rgb24_bilinear :
public span_image_filter<rgba8, Interpolator, Allocator>
{
public:
typedef Interpolator interpolator_type;
typedef Allocator alloc_type;
typedef span_image_filter<rgba8, Interpolator, Allocator> base_type;
typedef rgba8 color_type;
//--------------------------------------------------------------------
span_image_filter_rgb24_bilinear(alloc_type& alloc) : base_type(alloc) {}
//--------------------------------------------------------------------
span_image_filter_rgb24_bilinear(alloc_type& alloc,
const rendering_buffer& src,
const color_type& back_color,
interpolator_type& inter) :
base_type(alloc, src, back_color, inter, 0)
{}
//--------------------------------------------------------------------
color_type* generate(int x, int y, unsigned len)
{
base_type::interpolator().begin(x, y, len);
int fg[3];
int src_alpha;
int back_r = base_type::background_color().r;
int back_g = base_type::background_color().g;
int back_b = base_type::background_color().b;
int back_a = base_type::background_color().a;
const unsigned char *fg_ptr;
int stride = base_type::source_image().stride() - 2 * 3;
color_type* span = base_type::allocator().span();
int maxx = base_type::source_image().width() - 1;
int maxy = base_type::source_image().height() - 1;
do
{
int x_hr;
int y_hr;
base_type::interpolator().coordinates(&x_hr, &y_hr);
int x_lr = x_hr >> image_subpixel_shift;
int y_lr = y_hr >> image_subpixel_shift;
int weight;
if(x_lr >= 0 && y_lr >= 0 &&
x_lr < maxx && y_lr < maxy)
{
fg[0] =
fg[1] =
fg[2] = image_subpixel_size * image_subpixel_size / 2;
x_hr &= image_subpixel_mask;
y_hr &= image_subpixel_mask;
fg_ptr = base_type::source_image().row(y_lr) + x_lr + x_lr + x_lr;
weight = (image_subpixel_size - x_hr) *
(image_subpixel_size - y_hr);
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
weight = x_hr * (image_subpixel_size - y_hr);
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
fg_ptr += stride;
weight = (image_subpixel_size - x_hr) * y_hr;
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
weight = x_hr * y_hr;
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
fg[0] >>= image_subpixel_shift * 2;
fg[1] >>= image_subpixel_shift * 2;
fg[2] >>= image_subpixel_shift * 2;
src_alpha = 255;
}
else
{
if(x_lr < -1 || y_lr < -1 ||
x_lr > maxx || y_lr > maxy)
{
fg[Order::R] = back_r;
fg[Order::G] = back_g;
fg[Order::B] = back_b;
src_alpha = back_a;
}
else
{
fg[0] =
fg[1] =
fg[2] =
src_alpha = image_subpixel_size * image_subpixel_size / 2;
x_hr &= image_subpixel_mask;
y_hr &= image_subpixel_mask;
weight = (image_subpixel_size - x_hr) *
(image_subpixel_size - y_hr);
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg_ptr = base_type::source_image().row(y_lr) + x_lr + x_lr + x_lr;
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
src_alpha += weight * 255;
}
else
{
fg[Order::R] += back_r * weight;
fg[Order::G] += back_g * weight;
fg[Order::B] += back_b * weight;
src_alpha += back_a * weight;
}
x_lr++;
weight = x_hr * (image_subpixel_size - y_hr);
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg_ptr = base_type::source_image().row(y_lr) + x_lr + x_lr + x_lr;
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
src_alpha += weight * 255;
}
else
{
fg[Order::R] += back_r * weight;
fg[Order::G] += back_g * weight;
fg[Order::B] += back_b * weight;
src_alpha += back_a * weight;
}
x_lr--;
y_lr++;
weight = (image_subpixel_size - x_hr) * y_hr;
if(x_lr >= 0 && y_lr >= 0 &&
x_lr <= maxx && y_lr <= maxy)
{
fg_ptr = base_type::source_image().row(y_lr) + x_lr + x_lr + x_lr;
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
src_alpha += weight * 255;
}
else
{
fg[Order::R] += back_r * weight;
fg[Order::G] += back_g * weight;
fg[Order::B] += back_b * 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_ptr = base_type::source_image().row(y_lr) + x_lr + x_lr + x_lr;
fg[0] += weight * *fg_ptr++;
fg[1] += weight * *fg_ptr++;
fg[2] += weight * *fg_ptr++;
src_alpha += weight * 255;
}
else
{
fg[Order::R] += back_r * weight;
fg[Order::G] += back_g * weight;
fg[Order::B] += back_b * weight;
src_alpha += back_a * weight;
}
fg[0] >>= image_subpixel_shift * 2;
fg[1] >>= image_subpixel_shift * 2;
fg[2] >>= image_subpixel_shift * 2;
src_alpha >>= image_subpixel_shift * 2;
}
}
span->r = (int8u)fg[Order::R];
span->g = (int8u)fg[Order::G];
span->b = (int8u)fg[Order::B];
span->a = (int8u)src_alpha;
++span;
++base_type::interpolator();
} while(--len);
return base_type::allocator().span();
}
};
//=================================================span_image_filter_rgb24
template<class Order,
class Interpolator,
class Allocator = span_allocator<rgba8> >
class span_image_filter_rgb24 :
public span_image_filter<rgba8, Interpolator, Allocator>
{
public:
typedef Interpolator interpolator_type;
typedef Allocator alloc_type;
typedef span_image_filter<rgba8, Interpolator, alloc_type> base_type;
typedef rgba8 color_type;
//--------------------------------------------------------------------
span_image_filter_rgb24(alloc_type& alloc) : base_type(alloc) {}
//--------------------------------------------------------------------
span_image_filter_rgb24(alloc_type& alloc,
const rendering_buffer& src,
const color_type& back_color,
interpolator_type& inter,
const image_filter_base& filter) :
base_type(alloc, src, back_color, inter, &filter)
{}
//--------------------------------------------------------------------
color_type* generate(int x, int y, unsigned len)
{
base_type::interpolator().begin(x, y, len);
int fg[3];
int src_alpha;
int back_r = base_type::background_color().r;
int back_g = base_type::background_color().g;
int back_b = base_type::background_color().b;
int back_a = base_type::background_color().a;
const unsigned char *fg_ptr;
unsigned dimension = base_type::filter().dimension();
int start = base_type::filter().start();
int start1 = start - 1;
const int* weight_array = base_type::filter().weight_array_int();
int stride = base_type::source_image().stride() - dimension * 3;
color_type* span = base_type::allocator().span();
int maxx = base_type::source_image().width() + start - 2;
int maxy = base_type::source_image().height() + start - 2;
int maxx2 = base_type::source_image().width() - start - 1;
int maxy2 = base_type::source_image().height() - start - 1;
int x_count;
int weight_y;
do
{
base_type::interpolator().coordinates(&x, &y);
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[0] = fg[1] = fg[2] = image_filter_size / 2;
int x_fract = x_hr & image_subpixel_mask;
unsigned y_count = dimension;
if(x_lr >= -start && y_lr >= -start &&
x_lr <= maxx && y_lr <= maxy)
{
y_hr = image_subpixel_mask - (y_hr & image_subpixel_mask);
fg_ptr = base_type::source_image().row(y_lr + start) + (x_lr + start) * 3;
do
{
x_count = dimension;
weight_y = weight_array[y_hr];
x_hr = image_subpixel_mask - x_fract;
do
{
int weight = (weight_y * weight_array[x_hr] +
image_filter_size / 2) >>
image_filter_shift;
fg[0] += *fg_ptr++ * weight;
fg[1] += *fg_ptr++ * weight;
fg[2] += *fg_ptr++ * weight;
x_hr += image_subpixel_size;
} while(--x_count);
y_hr += image_subpixel_size;
fg_ptr += stride;
} while(--y_count);
fg[0] >>= image_filter_shift;
fg[1] >>= image_filter_shift;
fg[2] >>= image_filter_shift;
if(fg[0] < 0) fg[0] = 0;
if(fg[1] < 0) fg[1] = 0;
if(fg[2] < 0) fg[2] = 0;
if(fg[0] > 255) fg[0] = 255;
if(fg[1] > 255) fg[1] = 255;
if(fg[2] > 255) fg[2] = 255;
src_alpha = 255;
}
else
{
if(x_lr < start1 || y_lr < start1 ||
x_lr > maxx2 || y_lr > maxy2)
{
fg[Order::R] = back_r;
fg[Order::G] = back_g;
fg[Order::B] = back_b;
src_alpha = back_a;
}
else
{
src_alpha = image_filter_size / 2;
y_lr = (y >> image_subpixel_shift) + start;
y_hr = image_subpixel_mask - (y_hr & image_subpixel_mask);
do
{
x_count = dimension;
weight_y = weight_array[y_hr];
x_lr = (x >> image_subpixel_shift) + start;
x_hr = image_subpixel_mask - x_fract;
do
{
int weight = (weight_y * weight_array[x_hr] +
image_filter_size / 2) >>
image_filter_shift;
if(x_lr >= 0 && y_lr >= 0 &&
x_lr < int(base_type::source_image().width()) &&
y_lr < int(base_type::source_image().height()))
{
fg_ptr = base_type::source_image().row(y_lr) + x_lr * 3;
fg[0] += *fg_ptr++ * weight;
fg[1] += *fg_ptr++ * weight;
fg[2] += *fg_ptr++ * weight;
src_alpha += 255 * weight;
}
else
{
fg[Order::R] += back_r * weight;
fg[Order::G] += back_g * weight;
fg[Order::B] += back_b * weight;
src_alpha += back_a * weight;
}
x_hr += image_subpixel_size;
x_lr++;
} while(--x_count);
y_hr += image_subpixel_size;
y_lr++;
} while(--y_count);
fg[0] >>= image_filter_shift;
fg[1] >>= image_filter_shift;
fg[2] >>= image_filter_shift;
src_alpha >>= image_filter_shift;
if(fg[0] < 0) fg[0] = 0;
if(fg[1] < 0) fg[1] = 0;
if(fg[2] < 0) fg[2] = 0;
if(src_alpha < 0) src_alpha = 0;
if(fg[0] > 255) fg[0] = 255;
if(fg[1] > 255) fg[1] = 255;
if(fg[2] > 255) fg[2] = 255;
if(src_alpha > 255) src_alpha = 255;
}
}
span->r = (int8u)fg[Order::R];
span->g = (int8u)fg[Order::G];
span->b = (int8u)fg[Order::B];
span->a = (int8u)src_alpha;
++span;
++base_type::interpolator();
} while(--len);
return base_type::allocator().span();
}
};
}
#endif