// drawing
public void draw_async(rectangle cliprect, bool clearit = true)
{
// if the cliprect exceeds our current bitmap dimensions, expand
if (cliprect.right() >= m_bitmap.width() || cliprect.bottom() >= m_bitmap.height())
{
int new_width = std.max(cliprect.right() + 1, m_bitmap.width());
int new_height = std.max(cliprect.bottom() + 1, m_bitmap.height());
m_bitmap.resize(new_width, new_height, BITMAP_SLOP, BITMAP_SLOP);
m_dirty.resize(new_width, new_height);
}
// clear out the region
if (clearit)
{
clear(cliprect);
}
// wrap the bitmap, adjusting for x/y origins
_BitmapType wrapped = m_bitmapCreator(m_bitmap.pix(0) - m_xorigin - m_yorigin * m_bitmap.rowpixels(), m_xorigin + cliprect.right() + 1, m_yorigin + cliprect.bottom() + 1, m_bitmap.rowpixels()); //_BitmapType wrapped(&m_bitmap.pix(0) - m_xorigin - m_yorigin * m_bitmap.rowpixels(), m_xorigin + cliprect.right() + 1, m_yorigin + cliprect.bottom() + 1, m_bitmap.rowpixels());
// compute adjusted cliprect in source space
rectangle adjusted = cliprect;
adjusted.offset(m_xorigin, m_yorigin);
// render
draw(wrapped, adjusted);
}
