//---------------------------------------------------------------------
public line_interpolator_image(IPixelFormat ren, line_parameters lp,
int sx, int sy, int ex, int ey,
int pattern_start,
double scale_x)
{
m_lp = (lp);
m_li = new dda2_line_interpolator(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 = new distance_interpolator4(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 + LineAABasics.line_subpixel_scale) >> line_subpixel_shift);
m_start = (pattern_start + (m_max_extent + 2) * ren.pattern_width());
m_step = (0);
dda2_line_interpolator li = new dda2_line_interpolator(0, lp.vertical ?
(lp.dy << LineAABasics.line_subpixel_shift) :
(lp.dx << LineAABasics.line_subpixel_shift),
lp.len);
uint i;
int stop = m_width + LineAABasics.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;
}
//---------------------------------------------------------------------
public 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();
RGBA_Bytes *p0 = m_colors + max_half_width + 2;
RGBA_Bytes *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,
(uint)(p1 - p0),
p0);
return(npix && ++m_step < m_count);
}
//---------------------------------------------------------------------
public line_interpolator_image(IPixelFormat ren, line_parameters lp,
int sx, int sy, int ex, int ey,
int pattern_start,
double scale_x)
{
m_lp=(lp);
m_li = new dda2_line_interpolator(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 = new distance_interpolator4(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 + LineAABasics.line_subpixel_scale) >> line_subpixel_shift);
m_start=(pattern_start + (m_max_extent + 2) * ren.pattern_width());
m_step=(0);
dda2_line_interpolator li = new dda2_line_interpolator(0, lp.vertical ?
(lp.dy << LineAABasics.line_subpixel_shift) :
(lp.dx << LineAABasics.line_subpixel_shift),
lp.len);
uint i;
int stop = m_width + LineAABasics.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;
}