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