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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#ifndef AGG_RENDERER_SCANLINE_INCLUDED
#define AGG_RENDERER_SCANLINE_INCLUDED
#include "agg_basics.h"
#include "agg_renderer_base.h"
#include "agg_render_scanlines.h"
namespace agg
{
template<class BaseRenderer, class SpanGenerator> class renderer_scanline_aa
{
public:
typedef BaseRenderer base_ren_type;
typedef SpanGenerator span_gen_type;
renderer_scanline_aa() : m_ren(0), m_span_gen(0) {}
renderer_scanline_aa(base_ren_type& ren, span_gen_type& span_gen) :
m_ren(&ren),
m_span_gen(&span_gen)
{}
void attach(base_ren_type& ren, span_gen_type& span_gen)
{
m_ren = &ren;
m_span_gen = &span_gen;
}
void prepare(unsigned max_span_len)
{
m_span_gen->prepare(max_span_len);
}
template<class Scanline> void render(const Scanline& sl)
{
int y = sl.y();
m_ren->first_clip_box();
do {
int xmin = m_ren->xmin();
int xmax = m_ren->xmax();
if(y >= m_ren->ymin() && y <= m_ren->ymax()) {
unsigned num_spans = sl.num_spans();
typename Scanline::const_iterator span = sl.begin();
for(;;) {
int x = span->x;
int len = span->len;
bool solid = false;
const typename Scanline::cover_type* covers = span->covers;
if(len < 0) {
solid = true;
len = -len;
}
if(x < xmin) {
len -= xmin - x;
if(!solid) {
covers += xmin - x;
}
x = xmin;
}
if(len > 0) {
if(x + len > xmax) {
len = xmax - x + 1;
}
if(len > 0) {
m_ren->blend_color_hspan_no_clip(
x, y, len,
m_span_gen->generate(x, y, len),
solid ? 0 : covers,
*covers);
}
}
if(--num_spans == 0) {
break;
}
++span;
}
}
} while(m_ren->next_clip_box());
}
private:
base_ren_type* m_ren;
SpanGenerator* m_span_gen;
};
}
#endif
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