Array<To> cast(const Array<Ti> &in)
{
CastWrapper<To, Ti> cast_op;
return cast_op(in);
}
void getRectSubPix_Cn_(const _Tp* src, size_t src_step, Size src_size,
_DTp* dst, size_t dst_step, Size win_size, Point2f center, int cn )
{
ScaleOp scale_op;
CastOp cast_op;
Point ip;
_WTp a11, a12, a21, a22, b1, b2;
float a, b;
int i, j, c;
center.x -= (win_size.width-1)*0.5f;
center.y -= (win_size.height-1)*0.5f;
ip.x = cvFloor( center.x );
ip.y = cvFloor( center.y );
a = center.x - ip.x;
b = center.y - ip.y;
a11 = scale_op((1.f-a)*(1.f-b));
a12 = scale_op(a*(1.f-b));
a21 = scale_op((1.f-a)*b);
a22 = scale_op(a*b);
b1 = scale_op(1.f - b);
b2 = scale_op(b);
src_step /= sizeof(src[0]);
dst_step /= sizeof(dst[0]);
if( 0 <= ip.x && ip.x < src_size.width - win_size.width &&
0 <= ip.y && ip.y < src_size.height - win_size.height)
{
// extracted rectangle is totally inside the image
src += ip.y * src_step + ip.x*cn;
win_size.width *= cn;
for( i = 0; i < win_size.height; i++, src += src_step, dst += dst_step )
{
for( j = 0; j <= win_size.width - 2; j += 2 )
{
_WTp s0 = src[j]*a11 + src[j+cn]*a12 + src[j+src_step]*a21 + src[j+src_step+cn]*a22;
_WTp s1 = src[j+1]*a11 + src[j+cn+1]*a12 + src[j+src_step+1]*a21 + src[j+src_step+cn+1]*a22;
dst[j] = cast_op(s0);
dst[j+1] = cast_op(s1);
}
for( ; j < win_size.width; j++ )
{
_WTp s0 = src[j]*a11 + src[j+cn]*a12 + src[j+src_step]*a21 + src[j+src_step+cn]*a22;
dst[j] = cast_op(s0);
}
}
}
else
{
Rect r;
src = (const _Tp*)adjustRect( (const uchar*)src, src_step*sizeof(*src),
sizeof(*src)*cn, src_size, win_size, ip, &r);
for( i = 0; i < win_size.height; i++, dst += dst_step )
{
const _Tp *src2 = src + src_step;
_WTp s0;
if( i < r.y || i >= r.height )
src2 -= src_step;
for( c = 0; c < cn; c++ )
{
s0 = src[r.x*cn + c]*b1 + src2[r.x*cn + c]*b2;
for( j = 0; j < r.x; j++ )
dst[j*cn + c] = cast_op(s0);
s0 = src[r.width*cn + c]*b1 + src2[r.width*cn + c]*b2;
for( j = r.width; j < win_size.width; j++ )
dst[j*cn + c] = cast_op(s0);
}
for( j = r.x*cn; j < r.width*cn; j++ )
{
s0 = src[j]*a11 + src[j+cn]*a12 + src2[j]*a21 + src2[j+cn]*a22;
dst[j] = cast_op(s0);
}
if( i < r.height )
src = src2;
}
}
}
