| |
| //---------------------------------------------------------------------------- |
| // 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 |
