//----------------------------------------------------------------------------
// Anti-Grain Geometry (AGG) - Version 2.5
// A high quality rendering engine for C++
// Copyright (C) 2002-2006 Maxim Shemanarev
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://antigrain.com
//
// AGG is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// AGG is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with AGG; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301, USA.
//----------------------------------------------------------------------------
#ifndef AGG_RENDERER_OUTLINE_IMAGE_INCLUDED
#define AGG_RENDERER_OUTLINE_IMAGE_INCLUDED
#include "agg_array.h"
#include "agg_math.h"
#include "agg_line_aa_basics.h"
#include "agg_dda_line.h"
#include "agg_rendering_buffer.h"
#include "agg_clip_liang_barsky.h"
namespace agg
{
//========================================================line_image_scale
template<class Source> class line_image_scale
{
public:
typedef typename Source::color_type color_type;
line_image_scale(const Source& src, double height) :
m_source(src),
m_height(height),
m_scale(src.height() / height)
{
}
double width() const { return m_source.width(); }
double height() const { return m_height; }
color_type pixel(int x, int y) const
{
double src_y = (y + 0.5) * m_scale - 0.5;
int h = m_source.height() - 1;
int y1 = ufloor(src_y);
int y2 = y1 + 1;
color_type pix1 = (y1 < 0) ? color_type::no_color() : m_source.pixel(x, y1);
color_type pix2 = (y2 > h) ? color_type::no_color() : m_source.pixel(x, y2);
return pix1.gradient(pix2, src_y - y1);
}
private:
line_image_scale(const line_image_scale<Source>&);
const line_image_scale<Source>& operator = (const line_image_scale<Source>&);
const Source& m_source;
double m_height;
double m_scale;
};
//======================================================line_image_pattern
template<class Filter> class line_image_pattern
{
public:
typedef Filter filter_type;
typedef typename filter_type::color_type color_type;
//--------------------------------------------------------------------
line_image_pattern(const Filter& filter) :
m_filter(&filter),
m_dilation(filter.dilation() + 1),
m_dilation_hr(m_dilation << line_subpixel_shift),
m_data(),
m_width(0),
m_height(0),
m_width_hr(0),
m_half_height_hr(0),
m_offset_y_hr(0)
{
}
// Create
//--------------------------------------------------------------------
template<class Source>
line_image_pattern(const Filter& filter, const Source& src) :
m_filter(&filter),
m_dilation(filter.dilation() + 1),
m_dilation_hr(m_dilation << line_subpixel_shift),
m_data(),
m_width(0),
m_height(0),
m_width_hr(0),
m_half_height_hr(0),
m_offset_y_hr(0)
{
create(src);
}
// Create
//--------------------------------------------------------------------
template<class Source> void create(const Source& src)
{
m_height = uceil(src.height());
m_width = uceil(src.width());
m_width_hr = uround(src.width() * line_subpixel_scale);
m_half_height_hr = uround(src.height() * line_subpixel_scale/2);
m_offset_y_hr = m_dilation_hr + m_half_height_hr - line_subpixel_scale/2;
m_half_height_hr += line_subpixel_scale/2;
m_data.resize((m_width + m_dilation * 2) * (m_height + m_dilation * 2));
m_buf.attach(&m_data[0], m_width + m_dilation * 2,
m_height + m_dilation * 2,
m_width + m_dilation * 2);
unsigned x, y;
color_type* d1;
color_type* d2;
for(y = 0; y < m_height; y++)
{
d1 = m_buf.row_ptr(y + m_dilation) + m_dilation;
for(x = 0; x < m_width; x++)
{
*d1++ = src.pixel(x, y);
}
}
const color_type* s1;
const color_type* s2;
for(y = 0; y < m_dilation; y++)
{
//s1 = m_buf.row_ptr(m_height + m_dilation - 1) + m_dilation;
//s2 = m_buf.row_ptr(m_dilation) + m_dilation;
d1 = m_buf.row_ptr(m_dilation + m_height + y) + m_dilation;
d2 = m_buf.row_ptr(m_dilation - y - 1) + m_dilation;
for(x = 0; x < m_width; x++)
{
//*d1++ = color_type(*s1++, 0);
//*d2++ = color_type(*s2++, 0);
*d1++ = color_type::no_color();
*d2++ = color_type::no_color();
}
}
unsigned h = m_height + m_dilation * 2;
for(y = 0; y < h; y++)
{
s1 = m_buf.row_ptr(y) + m_dilation;
s2 = m_buf.row_ptr(y) + m_dilation + m_width;
d1 = m_buf.row_ptr(y) + m_dilation + m_width;
d2 = m_buf.row_ptr(y) + m_dilation;
for(x = 0; x < m_dilation; x++)
{
*d1++ = *s1++;
*--d2 = *--s2;
}
}
}
//--------------------------------------------------------------------
int pattern_width() const { return m_width_hr; }
int line_width() const { return m_half_height_hr; }
double width() const { return m_height; }
//--------------------------------------------------------------------
void pixel(color_type* p, int x, int y) const
{
m_filter->pixel_high_res(m_buf.rows(),
p,
x % m_width_hr + m_dilation_hr,
y + m_offset_y_hr);
}
//--------------------------------------------------------------------
const filter_type& filter() const { return *m_filter; }
private:
line_image_pattern(const line_image_pattern<filter_type>&);
const line_image_pattern<filter_type>&
operator = (const line_image_pattern<filter_type>&);
protected:
row_ptr_cache<color_type> m_buf;
const filter_type* m_filter;
unsigned m_dilation;
int m_dilation_hr;
pod_array<color_type> m_data;
unsigned m_width;
unsigned m_height;
int m_width_hr;
int m_half_height_hr;
int m_offset_y_hr;
};
//=================================================line_image_pattern_pow2
template<class Filter> class line_image_pattern_pow2 :
public line_image_pattern<Filter>
{
public:
typedef Filter filter_type;
typedef typename filter_type::color_type color_type;
typedef line_image_pattern<Filter> base_type;
//--------------------------------------------------------------------
line_image_pattern_pow2(const Filter& filter) :
line_image_pattern<Filter>(filter), m_mask(line_subpixel_mask) {}
//--------------------------------------------------------------------
template<class Source>
line_image_pattern_pow2(const Filter& filter, const Source& src) :
line_image_pattern<Filter>(filter), m_mask(line_subpixel_mask)
{
create(src);
}
//--------------------------------------------------------------------
template<class Source> void create(const Source& src)
{
line_image_pattern<Filter>::create(src);
m_mask = 1;
while(m_mask < base_type::m_width)
{
m_mask <<= 1;
m_mask |= 1;
}
m_mask <<= line_subpixel_shift - 1;
m_mask |= line_subpixel_mask;
base_type::m_width_hr = m_mask + 1;
}
//--------------------------------------------------------------------
void pixel(color_type* p, int x, int y) const
{
base_type::m_filter->pixel_high_res(
base_type::m_buf.rows(),
p,
(x & m_mask) + base_type::m_dilation_hr,
y + base_type::m_offset_y_hr);
}
private:
unsigned m_mask;
};
//===================================================distance_interpolator4
class distance_interpolator4
{
public:
//---------------------------------------------------------------------
distance_interpolator4() {}
distance_interpolator4(int x1, int y1, int x2, int y2,
int sx, int sy, int ex, int ey,
int len, double scale, int x, int y) :
m_dx(x2 - x1),
m_dy(y2 - y1),
m_dx_start(line_mr(sx) - line_mr(x1)),
m_dy_start(line_mr(sy) - line_mr(y1)),
m_dx_end(line_mr(ex) - line_mr(x2)),
m_dy_end(line_mr(ey) - line_mr(y2)),
m_dist(iround(double(x + line_subpixel_scale/2 - x2) * double(m_dy) -
double(y + line_subpixel_scale/2 - y2) * double(m_dx))),
m_dist_start((line_mr(x + line_subpixel_scale/2) - line_mr(sx)) * m_dy_start -
(line_mr(y + line_subpixel_scale/2) - line_mr(sy)) * m_dx_start),
m_dist_end((line_mr(x + line_subpixel_scale/2) - line_mr(ex)) * m_dy_end -
(line_mr(y + line_subpixel_scale/2) - line_mr(ey)) * m_dx_end),
m_len(uround(len / scale))
{
double d = len * scale;
int dx = iround(((x2 - x1) << line_subpixel_shift) / d);
int dy = iround(((y2 - y1) << line_subpixel_shift) / d);
m_dx_pict = -dy;
m_dy_pict = dx;
m_dist_pict = ((x + line_subpixel_scale/2 - (x1 - dy)) * m_dy_pict -
(y + line_subpixel_scale/2 - (y1 + dx)) * m_dx_pict) >>
line_subpixel_shift;
m_dx <<= line_subpixel_shift;
m_dy <<= line_subpixel_shift;
m_dx_start <<= line_mr_subpixel_shift;
m_dy_start <<= line_mr_subpixel_shift;
m_dx_end <<= line_mr_subpixel_shift;
m_dy_end <<= line_mr_subpixel_shift;
}
//---------------------------------------------------------------------
void inc_x()
{
m_dist += m_dy;
m_dist_start += m_dy_start;
m_dist_pict += m_dy_pict;
m_dist_end += m_dy_end;
}
//---------------------------------------------------------------------
void dec_x()
{
m_dist -= m_dy;
m_dist_start -= m_dy_start;
m_dist_pict -= m_dy_pict;
m_dist_end -= m_dy_end;
}
//---------------------------------------------------------------------
void inc_y()
{
m_dist -= m_dx;
m_dist_start -= m_dx_start;
m_dist_pict -= m_dx_pict;
m_dist_end -= m_dx_end;
}
//---------------------------------------------------------------------
void dec_y()
{
m_dist += m_dx;
m_dist_start += m_dx_start;
m_dist_pict += m_dx_pict;
m_dist_end += m_dx_end;
}
//---------------------------------------------------------------------
void inc_x(int dy)
{
m_dist += m_dy;
m_dist_start += m_dy_start;
m_dist_pict += m_dy_pict;
m_dist_end += m_dy_end;
if(dy > 0)
{
m_dist -= m_dx;
m_dist_start -= m_dx_start;
m_dist_pict -= m_dx_pict;
m_dist_end -= m_dx_end;
}
if(dy < 0)
{
m_dist += m_dx;
m_dist_start += m_dx_start;
m_dist_pict += m_dx_pict;
m_dist_end += m_dx_end;
}
}
//---------------------------------------------------------------------
void dec_x(int dy)
{
m_dist -= m_dy;
m_dist_start -= m_dy_start;
m_dist_pict -= m_dy_pict;
m_dist_end -= m_dy_end;
if(dy > 0)
{
m_dist -= m_dx;
m_dist_start -= m_dx_start;
m_dist_pict -= m_dx_pict;
m_dist_end -= m_dx_end;
}
if(dy < 0)
{
m_dist += m_dx;
m_dist_start += m_dx_start;
m_dist_pict += m_dx_pict;
m_dist_end += m_dx_end;
}
}
//---------------------------------------------------------------------
void inc_y(int dx)
{
m_dist -= m_dx;
m_dist_start -= m_dx_start;
m_dist_pict -= m_dx_pict;
m_dist_end -= m_dx_end;
if(dx > 0)
{
m_dist += m_dy;
m_dist_start += m_dy_start;
m_dist_pict += m_dy_pict;
m_dist_end += m_dy_end;
}
if(dx < 0)
{
m_dist -= m_dy;
m_dist_start -= m_dy_start;
m_dist_pict -= m_dy_pict;
m_dist_end -= m_dy_end;
}
}
//---------------------------------------------------------------------
void dec_y(int dx)
{
m_dist += m_dx;
m_dist_start += m_dx_start;
m_dist_pict += m_dx_pict;
m_dist_end += m_dx_end;
if(dx > 0)
{
m_dist += m_dy;
m_dist_start += m_dy_start;
m_dist_pict += m_dy_pict;
m_dist_end += m_dy_end;
}
if(dx < 0)
{
m_dist -= m_dy;
m_dist_start -= m_dy_start;
m_dist_pict -= m_dy_pict;
m_dist_end -= m_dy_end;
}
}
//---------------------------------------------------------------------
int dist() const { return m_dist; }
int dist_start() const { return m_dist_start; }
int dist_pict() const { return m_dist_pict; }
int dist_end() const { return m_dist_end; }
//---------------------------------------------------------------------
int dx() const { return m_dx; }
int dy() const { return m_dy; }
int dx_start() const { return m_dx_start; }
int dy_start() const { return m_dy_start; }
int dx_pict() const { return m_dx_pict; }
int dy_pict() const { return m_dy_pict; }
int dx_end() const { return m_dx_end; }
int dy_end() const { return m_dy_end; }
int len() const { return m_len; }
private:
//---------------------------------------------------------------------
int m_dx;
int m_dy;
int m_dx_start;
int m_dy_start;
int m_dx_pict;
int m_dy_pict;
int m_dx_end;
int m_dy_end;
int m_dist;
int m_dist_start;
int m_dist_pict;
int m_dist_end;
int m_len;
};
//==================================================line_interpolator_image
template<class Renderer> class line_interpolator_image
{
public:
typedef Renderer renderer_type;
typedef typename Renderer::color_type color_type;
//---------------------------------------------------------------------
enum max_half_width_e
{
max_half_width = 64
};
//---------------------------------------------------------------------
line_interpolator_image(renderer_type& ren, const line_parameters& lp,
int sx, int sy, int ex, int ey,
int pattern_start,
double scale_x) :
m_lp(lp),
m_li(lp.vertical ? line_dbl_hr(lp.x2 - lp.x1) :
line_dbl_hr(lp.y2 - lp.y1),
lp.vertical ? abs(lp.y2 - lp.y1) :
abs(lp.x2 - lp.x1) + 1),
m_di(lp.x1, lp.y1, lp.x2, lp.y2, sx, sy, ex, ey, lp.len, scale_x,
lp.x1 & ~line_subpixel_mask, lp.y1 & ~line_subpixel_mask),
m_ren(ren),
m_x(lp.x1 >> line_subpixel_shift),
m_y(lp.y1 >> line_subpixel_shift),
m_old_x(m_x),
m_old_y(m_y),
m_count((lp.vertical ? abs((lp.y2 >> line_subpixel_shift) - m_y) :
abs((lp.x2 >> line_subpixel_shift) - m_x))),
m_width(ren.subpixel_width()),
//m_max_extent(m_width >> (line_subpixel_shift - 2)),
m_max_extent((m_width + line_subpixel_scale) >> line_subpixel_shift),
m_start(pattern_start + (m_max_extent + 2) * ren.pattern_width()),
m_step(0)
{
agg::dda2_line_interpolator li(0, lp.vertical ?
(lp.dy << agg::line_subpixel_shift) :
(lp.dx << agg::line_subpixel_shift),
lp.len);
unsigned i;
int stop = m_width + line_subpixel_scale * 2;
for(i = 0; i < max_half_width; ++i)
{
m_dist_pos[i] = li.y();
if(m_dist_pos[i] >= stop) break;
++li;
}
m_dist_pos[i] = 0x7FFF0000;
int dist1_start;
int dist2_start;
int npix = 1;
if(lp.vertical)
{
do
{
--m_li;
m_y -= lp.inc;
m_x = (m_lp.x1 + m_li.y()) >> line_subpixel_shift;
if(lp.inc > 0) m_di.dec_y(m_x - m_old_x);
else m_di.inc_y(m_x - m_old_x);
m_old_x = m_x;
dist1_start = dist2_start = m_di.dist_start();
int dx = 0;
if(dist1_start < 0) ++npix;
do
{
dist1_start += m_di.dy_start();
dist2_start -= m_di.dy_start();
if(dist1_start < 0) ++npix;
if(dist2_start < 0) ++npix;
++dx;
}
while(m_dist_pos[dx] <= m_width);
if(npix == 0) break;
npix = 0;
}
while(--m_step >= -m_max_extent);
}
else
{
do
{
--m_li;
m_x -= lp.inc;
m_y = (m_lp.y1 + m_li.y()) >> line_subpixel_shift;
if(lp.inc > 0) m_di.dec_x(m_y - m_old_y);
else m_di.inc_x(m_y - m_old_y);
m_old_y = m_y;
dist1_start = dist2_start = m_di.dist_start();
int dy = 0;
if(dist1_start < 0) ++npix;
do
{
dist1_start -= m_di.dx_start();
dist2_start += m_di.dx_start();
if(dist1_start < 0) ++npix;
if(dist2_start < 0) ++npix;
++dy;
}
while(m_dist_pos[dy] <= m_width);
if(npix == 0) break;
npix = 0;
}
while(--m_step >= -m_max_extent);
}
m_li.adjust_forward();
m_step -= m_max_extent;
}
//---------------------------------------------------------------------
bool step_hor()
{
++m_li;
m_x += m_lp.inc;
m_y = (m_lp.y1 + m_li.y()) >> line_subpixel_shift;
if(m_lp.inc > 0) m_di.inc_x(m_y - m_old_y);
else m_di.dec_x(m_y - m_old_y);
m_old_y = m_y;
int s1 = m_di.dist() / m_lp.len;
int s2 = -s1;
if(m_lp.inc < 0) s1 = -s1;
int dist_start;
int dist_pict;
int dist_end;
int dy;
int dist;
dist_start = m_di.dist_start();
dist_pict = m_di.dist_pict() + m_start;
dist_end = m_di.dist_end();
color_type* p0 = m_colors + max_half_width + 2;
color_type* p1 = p0;
int npix = 0;
p1->clear();
if(dist_end > 0)
{
if(dist_start <= 0)
{
m_ren.pixel(p1, dist_pict, s2);
}
++npix;
}
++p1;
dy = 1;
while((dist = m_dist_pos[dy]) - s1 <= m_width)
{
dist_start -= m_di.dx_start();
dist_pict -= m_di.dx_pict();
dist_end -= m_di.dx_end();
p1->clear();
if(dist_end > 0 && dist_start <= 0)
{
if(m_lp.inc > 0) dist = -dist;
m_ren.pixel(p1, dist_pict, s2 - dist);
++npix;
}
++p1;
++dy;
}
dy = 1;
dist_start = m_di.dist_start();
dist_pict = m_di.dist_pict() + m_start;
dist_end = m_di.dist_end();
while((dist = m_dist_pos[dy]) + s1 <= m_width)
{
dist_start += m_di.dx_start();
dist_pict += m_di.dx_pict();
dist_end += m_di.dx_end();
--p0;
p0->clear();
if(dist_end > 0 && dist_start <= 0)
{
if(m_lp.inc > 0) dist = -dist;
m_ren.pixel(p0, dist_pict, s2 + dist);
++npix;
}
++dy;
}
m_ren.blend_color_vspan(m_x,
m_y - dy + 1,
unsigned(p1 - p0),
p0);
return npix && ++m_step < m_count;
}
//---------------------------------------------------------------------
bool step_ver()
{
++m_li;
m_y += m_lp.inc;
m_x = (m_lp.x1 + m_li.y()) >> line_subpixel_shift;
if(m_lp.inc > 0) m_di.inc_y(m_x - m_old_x);
else m_di.dec_y(m_x - m_old_x);
m_old_x = m_x;
int s1 = m_di.dist() / m_lp.len;
int s2 = -s1;
if(m_lp.inc > 0) s1 = -s1;
int dist_start;
int dist_pict;
int dist_end;
int dist;
int dx;
dist_start = m_di.dist_start();
dist_pict = m_di.dist_pict() + m_start;
dist_end = m_di.dist_end();
color_type* p0 = m_colors + max_half_width + 2;
color_type* p1 = p0;
int npix = 0;
p1->clear();
if(dist_end > 0)
{
if(dist_start <= 0)
{
m_ren.pixel(p1, dist_pict, s2);
}
++npix;
}
++p1;
dx = 1;
while((dist = m_dist_pos[dx]) - s1 <= m_width)
{
dist_start += m_di.dy_start();
dist_pict += m_di.dy_pict();
dist_end += m_di.dy_end();
p1->clear();
if(dist_end > 0 && dist_start <= 0)
{
if(m_lp.inc > 0) dist = -dist;
m_ren.pixel(p1, dist_pict, s2 + dist);
++npix;
}
++p1;
++dx;
}
dx = 1;
dist_start = m_di.dist_start();
dist_pict = m_di.dist_pict() + m_start;
dist_end = m_di.dist_end();
while((dist = m_dist_pos[dx]) + s1 <= m_width)
{
dist_start -= m_di.dy_start();
dist_pict -= m_di.dy_pict();
dist_end -= m_di.dy_end();
--p0;
p0->clear();
if(dist_end > 0 && dist_start <= 0)
{
if(m_lp.inc > 0) dist = -dist;
m_ren.pixel(p0, dist_pict, s2 - dist);
++npix;
}
++dx;
}
m_ren.blend_color_hspan(m_x - dx + 1,
m_y,
unsigned(p1 - p0),
p0);
return npix && ++m_step < m_count;
}
//---------------------------------------------------------------------
int pattern_end() const { return m_start + m_di.len(); }
//---------------------------------------------------------------------
bool vertical() const { return m_lp.vertical; }
int width() const { return m_width; }
int count() const { return m_count; }
private:
line_interpolator_image(const line_interpolator_image<Renderer>&);
const line_interpolator_image<Renderer>&
operator = (const line_interpolator_image<Renderer>&);
protected:
const line_parameters& m_lp;
dda2_line_interpolator m_li;
distance_interpolator4 m_di;
renderer_type& m_ren;
int m_plen;
int m_x;
int m_y;
int m_old_x;
int m_old_y;
int m_count;
int m_width;
int m_max_extent;
int m_start;
int m_step;
int m_dist_pos[max_half_width + 1];
color_type m_colors[max_half_width * 2 + 4];
};
//===================================================renderer_outline_image
template<class BaseRenderer, class ImagePattern>
class renderer_outline_image
{
public:
//---------------------------------------------------------------------
typedef BaseRenderer base_ren_type;
typedef renderer_outline_image<BaseRenderer, ImagePattern> self_type;
typedef typename base_ren_type::color_type color_type;
typedef ImagePattern pattern_type;
//---------------------------------------------------------------------
renderer_outline_image(base_ren_type& ren, const pattern_type& patt) :
m_ren(&ren),
m_pattern(&patt),
m_start(0),
m_scale_x(1.0),
m_clip_box(0,0,0,0),
m_clipping(false)
{}
void attach(base_ren_type& ren) { m_ren = &ren; }
//---------------------------------------------------------------------
void pattern(const pattern_type& p) { m_pattern = &p; }
const pattern_type& pattern() const { return *m_pattern; }
//---------------------------------------------------------------------
void reset_clipping() { m_clipping = false; }
void clip_box(double x1, double y1, double x2, double y2)
{
m_clip_box.x1 = line_coord_sat::conv(x1);
m_clip_box.y1 = line_coord_sat::conv(y1);
m_clip_box.x2 = line_coord_sat::conv(x2);
m_clip_box.y2 = line_coord_sat::conv(y2);
m_clipping = true;
}
//---------------------------------------------------------------------
void scale_x(double s) { m_scale_x = s; }
double scale_x() const { return m_scale_x; }
//---------------------------------------------------------------------
void start_x(double s) { m_start = iround(s * line_subpixel_scale); }
double start_x() const { return double(m_start) / line_subpixel_scale; }
//---------------------------------------------------------------------
int subpixel_width() const { return m_pattern->line_width(); }
int pattern_width() const { return m_pattern->pattern_width(); }
double width() const { return double(subpixel_width()) / line_subpixel_scale; }
//-------------------------------------------------------------------------
void pixel(color_type* p, int x, int y) const
{
m_pattern->pixel(p, x, y);
}
//-------------------------------------------------------------------------
void blend_color_hspan(int x, int y, unsigned len, const color_type* colors)
{
m_ren->blend_color_hspan(x, y, len, colors, 0);
}
//-------------------------------------------------------------------------
void blend_color_vspan(int x, int y, unsigned len, const color_type* colors)
{
m_ren->blend_color_vspan(x, y, len, colors, 0);
}
//-------------------------------------------------------------------------
static bool accurate_join_only() { return true; }
//-------------------------------------------------------------------------
template<class Cmp>
void semidot(Cmp, int, int, int, int)
{
}
//-------------------------------------------------------------------------
void pie(int, int, int, int, int, int)
{
}
//-------------------------------------------------------------------------
void line0(const line_parameters&)
{
}
//-------------------------------------------------------------------------
void line1(const line_parameters&, int, int)
{
}
//-------------------------------------------------------------------------
void line2(const line_parameters&, int, int)
{
}
//-------------------------------------------------------------------------
void line3_no_clip(const line_parameters& lp,
int sx, int sy, int ex, int ey)
{
if(lp.len > line_max_length)
{
line_parameters lp1, lp2;
lp.divide(lp1, lp2);
int mx = lp1.x2 + (lp1.y2 - lp1.y1);
int my = lp1.y2 - (lp1.x2 - lp1.x1);
line3_no_clip(lp1, (lp.x1 + sx) >> 1, (lp.y1 + sy) >> 1, mx, my);
line3_no_clip(lp2, mx, my, (lp.x2 + ex) >> 1, (lp.y2 + ey) >> 1);
return;
}
fix_degenerate_bisectrix_start(lp, &sx, &sy);
fix_degenerate_bisectrix_end(lp, &ex, &ey);
line_interpolator_image<self_type> li(*this, lp,
sx, sy,
ex, ey,
m_start, m_scale_x);
if(li.vertical())
{
while(li.step_ver());
}
else
{
while(li.step_hor());
}
m_start += uround(lp.len / m_scale_x);
}
//-------------------------------------------------------------------------
void line3(const line_parameters& lp,
int sx, int sy, int ex, int ey)
{
if(m_clipping)
{
int x1 = lp.x1;
int y1 = lp.y1;
int x2 = lp.x2;
int y2 = lp.y2;
unsigned flags = clip_line_segment(&x1, &y1, &x2, &y2, m_clip_box);
int start = m_start;
if((flags & 4) == 0)
{
if(flags)
{
line_parameters lp2(x1, y1, x2, y2,
uround(calc_distance(x1, y1, x2, y2)));
if(flags & 1)
{
m_start += uround(calc_distance(lp.x1, lp.y1, x1, y1) / m_scale_x);
sx = x1 + (y2 - y1);
sy = y1 - (x2 - x1);
}
else
{
while(abs(sx - lp.x1) + abs(sy - lp.y1) > lp2.len)
{
sx = (lp.x1 + sx) >> 1;
sy = (lp.y1 + sy) >> 1;
}
}
if(flags & 2)
{
ex = x2 + (y2 - y1);
ey = y2 - (x2 - x1);
}
else
{
while(abs(ex - lp.x2) + abs(ey - lp.y2) > lp2.len)
{
ex = (lp.x2 + ex) >> 1;
ey = (lp.y2 + ey) >> 1;
}
}
line3_no_clip(lp2, sx, sy, ex, ey);
}
else
{
line3_no_clip(lp, sx, sy, ex, ey);
}
}
m_start = start + uround(lp.len / m_scale_x);
}
else
{
line3_no_clip(lp, sx, sy, ex, ey);
}
}
private:
base_ren_type* m_ren;
const pattern_type* m_pattern;
int m_start;
double m_scale_x;
rect_i m_clip_box;
bool m_clipping;
};
}
#endif
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