//----------------------------------------------------------------
public void begin(double x, double y, int len)
{
m_pos = 1;
m_src_x = agg_basics.iround(x * subpixel_scale) + subpixel_scale;
m_src_y = y;
m_len = len;
if (len > m_subdiv_size)
{
len = (int)m_subdiv_size;
}
m_interpolator.begin(x, y, len);
}
public override void generate(Color[] span, int spanIndex, int x, int y, int len)
{
ImageBuffer SourceRenderingBuffer = (ImageBuffer)GetImageBufferAccessor().SourceImage;
if (SourceRenderingBuffer.BitDepth != 24)
{
throw new NotSupportedException("The source is expected to be 32 bit.");
}
ISpanInterpolator spanInterpolator = interpolator();
spanInterpolator.begin(x + filter_dx_dbl(), y + filter_dy_dbl(), len);
int x_hr;
int y_hr;
spanInterpolator.coordinates(out x_hr, out y_hr);
int x_lr = x_hr >> (int)image_subpixel_scale_e.image_subpixel_shift;
int y_lr = y_hr >> (int)image_subpixel_scale_e.image_subpixel_shift;
int bufferIndex;
bufferIndex = SourceRenderingBuffer.GetBufferOffsetXY(x_lr, y_lr);
byte[] fg_ptr = SourceRenderingBuffer.GetBuffer();
#if USE_UNSAFE_CODE
unsafe
{
fixed(byte *pSource = fg_ptr)
{
do
{
span[spanIndex++] = *(RGBA_Bytes *)&(pSource[bufferIndex]);
bufferIndex += 4;
} while (--len != 0);
}
}
#else
Color color = Color.White;
do
{
color.blue = fg_ptr[bufferIndex++];
color.green = fg_ptr[bufferIndex++];
color.red = fg_ptr[bufferIndex++];
span[spanIndex++] = color;
} while (--len != 0);
#endif
}