//--------------------------------------------------------------------
// The scanline rendering function itself.
template<class Scanline> void render(const Scanline& sl)
{
unsigned num_spans = sl.num_spans();
int y = sl.y();
Scanline::const_iterator span = sl.begin();
do
{
int len = span->len;
int x;
if(len > 0)
{
// pixel-by-pixel
const Scanline::cover_type* covers = span->covers;
x = span->x;
do
{
blend_pixel(x++, y, *covers++);
}
while(--len);
}
else
{
if(*span->covers == 255)
{
// solid span. happens often
draw_solid_span(span->x, y, -len);
}
else
{
// pixel-by-pixel again
x = span->x;
do
{
blend_pixel(x++, y, *span->covers);
}
while(++len);
}
}
++span;
}
while(--num_spans);
}
//--------------------------------------------------------------------
template<class Scanline> void render(const Scanline& sl)
{
int y = sl.y();
unsigned num_spans = sl.num_spans();
typename Scanline::const_iterator span = sl.begin();
do
{
int x = span->x;
const typename Scanline::cover_type* covers = span->covers;
int num_pix = span->len;
do
{
int a = (*covers++ * m_color.a) >> 8;
m_ren.color(rgba8(m_color.r, m_color.g, m_color.b, a));
m_square.draw(m_ras, m_sl, m_ren, x, y);
++x;
}
while(--num_pix);
}
while(--num_spans);
}