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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_SPAN_IMAGE_RESAMPLE_INCLUDED
#define AGG_SPAN_IMAGE_RESAMPLE_INCLUDED
#include "agg_span_image_filter.h"
#include "agg_span_interpolator_linear.h"
namespace agg
{
//=====================================================span_image_resample
template<class ColorT, class Interpolator, class Allocator>
class span_image_resample :
public span_image_filter<ColorT, Interpolator, Allocator>
{
public:
typedef ColorT color_type;
typedef Interpolator interpolator_type;
typedef Allocator alloc_type;
typedef span_image_filter<color_type, interpolator_type, alloc_type> base_type;
//--------------------------------------------------------------------
span_image_resample(alloc_type& alloc) :
base_type(alloc),
m_scale_limit(20),
m_blur_x(image_subpixel_size),
m_blur_y(image_subpixel_size)
{}
//--------------------------------------------------------------------
span_image_resample(alloc_type& alloc,
const rendering_buffer& src,
const color_type& back_color,
interpolator_type& inter,
const image_filter_lut& filter) :
base_type(alloc, src, back_color, inter, &filter),
m_scale_limit(20),
m_blur_x(image_subpixel_size),
m_blur_y(image_subpixel_size)
{}
//--------------------------------------------------------------------
int scale_limit() const { return m_scale_limit; }
void scale_limit(int v) { m_scale_limit = v; }
//--------------------------------------------------------------------
double blur_x() const { return double(m_blur_x) / double(image_subpixel_size); }
double blur_y() const { return double(m_blur_y) / double(image_subpixel_size); }
void blur_x(double v) { m_blur_x = int(v * double(image_subpixel_size) + 0.5); }
void blur_y(double v) { m_blur_y = int(v * double(image_subpixel_size) + 0.5); }
void blur(double v) { m_blur_x =
m_blur_y = int(v * double(image_subpixel_size) + 0.5); }
protected:
int m_scale_limit;
int m_blur_x;
int m_blur_y;
};
//==============================================span_image_resample_affine
template<class ColorT, class Allocator>
class span_image_resample_affine :
public span_image_filter<ColorT, span_interpolator_linear<trans_affine>, Allocator>
{
public:
typedef ColorT color_type;
typedef span_interpolator_linear<trans_affine> interpolator_type;
typedef Allocator alloc_type;
typedef span_image_filter<color_type, interpolator_type, alloc_type> base_type;
//--------------------------------------------------------------------
span_image_resample_affine(alloc_type& alloc) :
base_type(alloc),
m_scale_limit(200.0),
m_blur_x(1.0),
m_blur_y(1.0)
{}
//--------------------------------------------------------------------
span_image_resample_affine(alloc_type& alloc,
const rendering_buffer& src,
const color_type& back_color,
interpolator_type& inter,
const image_filter_lut& filter_) :
base_type(alloc, src, back_color, inter, &filter_),
m_scale_limit(200.0),
m_blur_x(1.0),
m_blur_y(1.0)
{}
//--------------------------------------------------------------------
int scale_limit() const { return int(m_scale_limit); }
void scale_limit(int v) { m_scale_limit = v; }
//--------------------------------------------------------------------
double blur_x() const { return m_blur_x; }
double blur_y() const { return m_blur_y; }
void blur_x(double v) { m_blur_x = v; }
void blur_y(double v) { m_blur_y = v; }
void blur(double v) { m_blur_x = m_blur_y = v; }
//--------------------------------------------------------------------
void prepare(unsigned max_span_len)
{
base_type::prepare(max_span_len);
double scale_x;
double scale_y;
base_type::interpolator().transformer().scaling_abs(&scale_x, &scale_y);
m_rx = image_subpixel_size;
m_ry = image_subpixel_size;
m_rx_inv = image_subpixel_size;
m_ry_inv = image_subpixel_size;
scale_x *= m_blur_x;
scale_y *= m_blur_y;
if(scale_x * scale_y > m_scale_limit)
{
scale_x = scale_x * m_scale_limit / (scale_x * scale_y);
scale_y = scale_y * m_scale_limit / (scale_x * scale_y);
}
if(scale_x > 1.0001)
{
if(scale_x > m_scale_limit) scale_x = m_scale_limit;
m_rx = int( scale_x * double(image_subpixel_size) + 0.5);
m_rx_inv = int(1.0/scale_x * double(image_subpixel_size) + 0.5);
}
if(scale_y > 1.0001)
{
if(scale_y > m_scale_limit) scale_y = m_scale_limit;
m_ry = int( scale_y * double(image_subpixel_size) + 0.5);
m_ry_inv = int(1.0/scale_y * double(image_subpixel_size) + 0.5);
}
}
protected:
int m_rx;
int m_ry;
int m_rx_inv;
int m_ry_inv;
private:
double m_scale_limit;
double m_blur_x;
double m_blur_y;
};
}
#endif
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