1 files changed, 93 insertions, 0 deletions
diff --git a/third_party/agg23/agg_renderer_scanline.h b/third_party/agg23/agg_renderer_scanline.h
new file mode 100644
index 0000000000..62d104f7f2
--- /dev/null
+++ b/third_party/agg23/agg_renderer_scanline.h
@@ -0,0 +1,93 @@
+
+//----------------------------------------------------------------------------
+// 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