public override void generate(RGBA_Bytes[] span, int spanIndex, int x, int y, int len)
{
ISpanInterpolator spanInterpolator = base.interpolator();
spanInterpolator.begin(x + base.filter_dx_dbl(), y + base.filter_dy_dbl(), len);
int[] fg = new int[3];
byte[] fg_ptr;
int[] weightArray = filter().weight_array();
int diameter = (int)base.filter().diameter();
int filter_scale = diameter << (int)image_subpixel_scale_e.image_subpixel_shift;
int[] weight_array = weightArray;
do
{
int rx;
int ry;
int rx_inv = (int)image_subpixel_scale_e.image_subpixel_scale;
int ry_inv = (int)image_subpixel_scale_e.image_subpixel_scale;
spanInterpolator.coordinates(out x, out y);
spanInterpolator.local_scale(out rx, out ry);
base.adjust_scale(ref rx, ref ry);
rx_inv = (int)image_subpixel_scale_e.image_subpixel_scale * (int)image_subpixel_scale_e.image_subpixel_scale / rx;
ry_inv = (int)image_subpixel_scale_e.image_subpixel_scale * (int)image_subpixel_scale_e.image_subpixel_scale / ry;
int radius_x = (diameter * rx) >> 1;
int radius_y = (diameter * ry) >> 1;
int len_x_lr =
(diameter * rx + (int)image_subpixel_scale_e.image_subpixel_mask) >>
(int)(int)image_subpixel_scale_e.image_subpixel_shift;
x += base.filter_dx_int() - radius_x;
y += base.filter_dy_int() - radius_y;
fg[0] = fg[1] = fg[2] = (int)image_filter_scale_e.image_filter_scale / 2;
int y_lr = y >> (int)(int)image_subpixel_scale_e.image_subpixel_shift;
int y_hr = (((int)image_subpixel_scale_e.image_subpixel_mask - (y & (int)image_subpixel_scale_e.image_subpixel_mask)) *
ry_inv) >> (int)(int)image_subpixel_scale_e.image_subpixel_shift;
int total_weight = 0;
int x_lr = x >> (int)(int)image_subpixel_scale_e.image_subpixel_shift;
int x_hr = (((int)image_subpixel_scale_e.image_subpixel_mask - (x & (int)image_subpixel_scale_e.image_subpixel_mask)) *
rx_inv) >> (int)(int)image_subpixel_scale_e.image_subpixel_shift;
int x_hr2 = x_hr;
int sourceIndex;
fg_ptr = base.GetImageBufferAccessor().span(x_lr, y_lr, len_x_lr, out sourceIndex);
for (; ;)
{
int weight_y = weight_array[y_hr];
x_hr = x_hr2;
for (; ;)
{
int weight = (weight_y * weight_array[x_hr] +
(int)image_filter_scale_e.image_filter_scale / 2) >>
downscale_shift;
fg[0] += fg_ptr[sourceIndex + ImageBuffer.OrderR] * weight;
fg[1] += fg_ptr[sourceIndex + ImageBuffer.OrderG] * weight;
fg[2] += fg_ptr[sourceIndex + ImageBuffer.OrderB] * weight;
total_weight += weight;
x_hr += rx_inv;
if (x_hr >= filter_scale)
{
break;
}
fg_ptr = base.GetImageBufferAccessor().next_x(out sourceIndex);
}
y_hr += ry_inv;
if (y_hr >= filter_scale)
{
break;
}
fg_ptr = base.GetImageBufferAccessor().next_y(out sourceIndex);
}
fg[0] /= total_weight;
fg[1] /= total_weight;
fg[2] /= total_weight;
if (fg[0] < 0)
{
fg[0] = 0;
}
if (fg[1] < 0)
{
fg[1] = 0;
}
if (fg[2] < 0)
{
fg[2] = 0;
}
if (fg[0] > base_mask)
{
fg[0] = base_mask;
}
if (fg[1] > base_mask)
{
fg[1] = base_mask;
}
if (fg[2] > base_mask)
{
fg[2] = base_mask;
}
span[spanIndex].alpha = base_mask;
span[spanIndex].red = (byte)fg[0];
span[spanIndex].green = (byte)fg[1];
span[spanIndex].blue = (byte)fg[2];
spanIndex++;
interpolator().Next();
} while (--len != 0);
}
//----------------------------------------------------------------
public void local_scale(out int x, out int y)
{
m_interpolator.local_scale(out x, out y);
}