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854 lines
33 KiB
C++
854 lines
33 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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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 <limits>
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#include <cstdlib>
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#include "agg_basics.h"
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#include "agg_renderer_base.h"
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namespace agg
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{
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//================================================render_scanline_aa_solid
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template<class Scanline, class BaseRenderer, class ColorT>
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void render_scanline_aa_solid(const Scanline& sl,
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BaseRenderer& ren,
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const ColorT& color)
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{
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int y = sl.y();
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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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{
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int x = span->x;
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if(span->len > 0)
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{
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ren.blend_solid_hspan(x, y, (unsigned)span->len,
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color,
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span->covers);
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}
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else
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{
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ren.blend_hline(x, y, (unsigned)(x - span->len - 1),
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color,
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*(span->covers));
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}
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if(--num_spans == 0) break;
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++span;
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}
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}
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//===============================================render_scanlines_aa_solid
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template<class Rasterizer, class Scanline,
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class BaseRenderer, class ColorT>
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void render_scanlines_aa_solid(Rasterizer& ras, Scanline& sl,
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BaseRenderer& ren, const ColorT& color)
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{
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if(ras.rewind_scanlines())
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{
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// Explicitly convert "color" to the BaseRenderer color type.
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// For example, it can be called with color type "rgba", while
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// "rgba8" is needed. Otherwise it will be implicitly
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// converted in the loop many times.
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//----------------------
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typename BaseRenderer::color_type ren_color = color;
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sl.reset(ras.min_x(), ras.max_x());
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while(ras.sweep_scanline(sl))
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{
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//render_scanline_aa_solid(sl, ren, ren_color);
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// This code is equivalent to the above call (copy/paste).
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// It's just a "manual" optimization for old compilers,
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// like Microsoft Visual C++ v6.0
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//-------------------------------
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int y = sl.y();
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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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{
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int x = span->x;
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if(span->len > 0)
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{
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ren.blend_solid_hspan(x, y, (unsigned)span->len,
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ren_color,
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span->covers);
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}
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else
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{
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ren.blend_hline(x, y, (unsigned)(x - span->len - 1),
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ren_color,
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*(span->covers));
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}
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if(--num_spans == 0) break;
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++span;
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}
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}
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}
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}
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//==============================================renderer_scanline_aa_solid
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template<class BaseRenderer> class renderer_scanline_aa_solid
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{
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public:
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typedef BaseRenderer base_ren_type;
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typedef typename base_ren_type::color_type color_type;
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//--------------------------------------------------------------------
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renderer_scanline_aa_solid() : m_ren(0) {}
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explicit renderer_scanline_aa_solid(base_ren_type& ren) : m_ren(&ren) {}
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void attach(base_ren_type& ren)
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{
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m_ren = &ren;
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}
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//--------------------------------------------------------------------
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void color(const color_type& c) { m_color = c; }
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const color_type& color() const { return m_color; }
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//--------------------------------------------------------------------
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void prepare() {}
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//--------------------------------------------------------------------
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template<class Scanline> void render(const Scanline& sl)
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{
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render_scanline_aa_solid(sl, *m_ren, m_color);
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}
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private:
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base_ren_type* m_ren;
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color_type m_color;
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};
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//======================================================render_scanline_aa
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template<class Scanline, class BaseRenderer,
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class SpanAllocator, class SpanGenerator>
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void render_scanline_aa(const Scanline& sl, BaseRenderer& ren,
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SpanAllocator& alloc, SpanGenerator& span_gen)
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{
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int y = sl.y();
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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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{
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int x = span->x;
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int len = span->len;
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const typename Scanline::cover_type* covers = span->covers;
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if(len < 0) len = -len;
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typename BaseRenderer::color_type* colors = alloc.allocate(len);
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span_gen.generate(colors, x, y, len);
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ren.blend_color_hspan(x, y, len, colors,
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(span->len < 0) ? 0 : covers, *covers);
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if(--num_spans == 0) break;
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++span;
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}
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}
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//=====================================================render_scanlines_aa
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template<class Rasterizer, class Scanline, class BaseRenderer,
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class SpanAllocator, class SpanGenerator>
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void render_scanlines_aa(Rasterizer& ras, Scanline& sl, BaseRenderer& ren,
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SpanAllocator& alloc, SpanGenerator& span_gen)
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{
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if(ras.rewind_scanlines())
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{
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sl.reset(ras.min_x(), ras.max_x());
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span_gen.prepare();
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while(ras.sweep_scanline(sl))
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{
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render_scanline_aa(sl, ren, alloc, span_gen);
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}
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}
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}
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//====================================================renderer_scanline_aa
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template<class BaseRenderer, class SpanAllocator, class SpanGenerator>
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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 SpanAllocator alloc_type;
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typedef SpanGenerator span_gen_type;
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//--------------------------------------------------------------------
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renderer_scanline_aa() : m_ren(0), m_alloc(0), m_span_gen(0) {}
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renderer_scanline_aa(base_ren_type& ren,
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alloc_type& alloc,
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span_gen_type& span_gen) :
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m_ren(&ren),
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m_alloc(&alloc),
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m_span_gen(&span_gen)
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{}
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void attach(base_ren_type& ren,
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alloc_type& alloc,
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span_gen_type& span_gen)
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{
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m_ren = &ren;
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m_alloc = &alloc;
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m_span_gen = &span_gen;
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}
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//--------------------------------------------------------------------
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void prepare() { m_span_gen->prepare(); }
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//--------------------------------------------------------------------
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template<class Scanline> void render(const Scanline& sl)
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{
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render_scanline_aa(sl, *m_ren, *m_alloc, *m_span_gen);
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}
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private:
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base_ren_type* m_ren;
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alloc_type* m_alloc;
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span_gen_type* m_span_gen;
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};
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//===============================================render_scanline_bin_solid
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template<class Scanline, class BaseRenderer, class ColorT>
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void render_scanline_bin_solid(const Scanline& sl,
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BaseRenderer& ren,
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const ColorT& color)
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{
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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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{
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ren.blend_hline(span->x,
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sl.y(),
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span->x - 1 + ((span->len < 0) ?
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-span->len :
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span->len),
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color,
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cover_full);
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if(--num_spans == 0) break;
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++span;
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}
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}
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//==============================================render_scanlines_bin_solid
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template<class Rasterizer, class Scanline,
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class BaseRenderer, class ColorT>
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void render_scanlines_bin_solid(Rasterizer& ras, Scanline& sl,
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BaseRenderer& ren, const ColorT& color)
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{
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if(ras.rewind_scanlines())
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{
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// Explicitly convert "color" to the BaseRenderer color type.
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// For example, it can be called with color type "rgba", while
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// "rgba8" is needed. Otherwise it will be implicitly
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// converted in the loop many times.
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//----------------------
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typename BaseRenderer::color_type ren_color(color);
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sl.reset(ras.min_x(), ras.max_x());
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while(ras.sweep_scanline(sl))
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{
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//render_scanline_bin_solid(sl, ren, ren_color);
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// This code is equivalent to the above call (copy/paste).
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// It's just a "manual" optimization for old compilers,
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// like Microsoft Visual C++ v6.0
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//-------------------------------
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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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{
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ren.blend_hline(span->x,
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sl.y(),
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span->x - 1 + ((span->len < 0) ?
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-span->len :
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span->len),
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ren_color,
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cover_full);
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if(--num_spans == 0) break;
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++span;
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}
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}
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}
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}
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//=============================================renderer_scanline_bin_solid
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template<class BaseRenderer> class renderer_scanline_bin_solid
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{
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public:
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typedef BaseRenderer base_ren_type;
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typedef typename base_ren_type::color_type color_type;
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//--------------------------------------------------------------------
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renderer_scanline_bin_solid() : m_ren(0) {}
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explicit renderer_scanline_bin_solid(base_ren_type& ren) : m_ren(&ren) {}
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void attach(base_ren_type& ren)
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{
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m_ren = &ren;
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}
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//--------------------------------------------------------------------
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void color(const color_type& c) { m_color = c; }
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const color_type& color() const { return m_color; }
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//--------------------------------------------------------------------
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void prepare() {}
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//--------------------------------------------------------------------
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template<class Scanline> void render(const Scanline& sl)
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{
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render_scanline_bin_solid(sl, *m_ren, m_color);
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}
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private:
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base_ren_type* m_ren;
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color_type m_color;
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};
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//======================================================render_scanline_bin
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template<class Scanline, class BaseRenderer,
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class SpanAllocator, class SpanGenerator>
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void render_scanline_bin(const Scanline& sl, BaseRenderer& ren,
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SpanAllocator& alloc, SpanGenerator& span_gen)
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{
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int y = sl.y();
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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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{
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int x = span->x;
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int len = span->len;
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if(len < 0) len = -len;
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typename BaseRenderer::color_type* colors = alloc.allocate(len);
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span_gen.generate(colors, x, y, len);
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ren.blend_color_hspan(x, y, len, colors, 0, cover_full);
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if(--num_spans == 0) break;
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++span;
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}
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}
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//=====================================================render_scanlines_bin
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template<class Rasterizer, class Scanline, class BaseRenderer,
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class SpanAllocator, class SpanGenerator>
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void render_scanlines_bin(Rasterizer& ras, Scanline& sl, BaseRenderer& ren,
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SpanAllocator& alloc, SpanGenerator& span_gen)
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{
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if(ras.rewind_scanlines())
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{
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sl.reset(ras.min_x(), ras.max_x());
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span_gen.prepare();
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while(ras.sweep_scanline(sl))
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{
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render_scanline_bin(sl, ren, alloc, span_gen);
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}
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}
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}
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//====================================================renderer_scanline_bin
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template<class BaseRenderer, class SpanAllocator, class SpanGenerator>
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class renderer_scanline_bin
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{
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public:
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typedef BaseRenderer base_ren_type;
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typedef SpanAllocator alloc_type;
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typedef SpanGenerator span_gen_type;
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//--------------------------------------------------------------------
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renderer_scanline_bin() : m_ren(0), m_alloc(0), m_span_gen(0) {}
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renderer_scanline_bin(base_ren_type& ren,
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alloc_type& alloc,
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span_gen_type& span_gen) :
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m_ren(&ren),
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m_alloc(&alloc),
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m_span_gen(&span_gen)
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{}
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void attach(base_ren_type& ren,
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alloc_type& alloc,
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span_gen_type& span_gen)
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{
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m_ren = &ren;
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m_alloc = &alloc;
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m_span_gen = &span_gen;
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}
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//--------------------------------------------------------------------
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void prepare() { m_span_gen->prepare(); }
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//--------------------------------------------------------------------
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template<class Scanline> void render(const Scanline& sl)
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{
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render_scanline_bin(sl, *m_ren, *m_alloc, *m_span_gen);
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}
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private:
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base_ren_type* m_ren;
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alloc_type* m_alloc;
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span_gen_type* m_span_gen;
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};
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//========================================================render_scanlines
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template<class Rasterizer, class Scanline, class Renderer>
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void render_scanlines(Rasterizer& ras, Scanline& sl, Renderer& ren)
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{
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if(ras.rewind_scanlines())
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{
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sl.reset(ras.min_x(), ras.max_x());
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ren.prepare();
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while(ras.sweep_scanline(sl))
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{
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ren.render(sl);
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}
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}
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}
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//========================================================render_all_paths
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template<class Rasterizer, class Scanline, class Renderer,
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class VertexSource, class ColorStorage, class PathId>
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void render_all_paths(Rasterizer& ras,
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Scanline& sl,
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Renderer& r,
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VertexSource& vs,
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const ColorStorage& as,
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const PathId& path_id,
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unsigned num_paths)
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{
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for(unsigned i = 0; i < num_paths; i++)
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{
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ras.reset();
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ras.add_path(vs, path_id[i]);
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r.color(as[i]);
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render_scanlines(ras, sl, r);
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}
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}
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//=============================================render_scanlines_compound
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template<class Rasterizer,
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class ScanlineAA,
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class ScanlineBin,
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class BaseRenderer,
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class SpanAllocator,
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class StyleHandler>
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void render_scanlines_compound(Rasterizer& ras,
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ScanlineAA& sl_aa,
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ScanlineBin& sl_bin,
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BaseRenderer& ren,
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SpanAllocator& alloc,
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StyleHandler& sh)
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{
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if(ras.rewind_scanlines())
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{
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int min_x = ras.min_x();
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int len = ras.max_x() - min_x + 2;
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sl_aa.reset(min_x, ras.max_x());
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sl_bin.reset(min_x, ras.max_x());
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typedef typename BaseRenderer::color_type color_type;
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color_type* color_span = alloc.allocate(len * 2);
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color_type* mix_buffer = color_span + len;
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unsigned num_spans;
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unsigned num_styles;
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unsigned style;
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bool solid;
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while((num_styles = ras.sweep_styles()) > 0)
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{
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typename ScanlineAA::const_iterator span_aa;
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if(num_styles == 1)
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{
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// Optimization for a single style. Happens often
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//-------------------------
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if(ras.sweep_scanline(sl_aa, 0))
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{
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style = ras.style(0);
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if(sh.is_solid(style))
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{
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// Just solid fill
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//-----------------------
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render_scanline_aa_solid(sl_aa, ren, sh.color(style));
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}
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else
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{
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// Arbitrary span generator
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//-----------------------
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span_aa = sl_aa.begin();
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num_spans = sl_aa.num_spans();
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for(;;)
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{
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len = span_aa->len;
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sh.generate_span(color_span,
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span_aa->x,
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sl_aa.y(),
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len,
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style);
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ren.blend_color_hspan(span_aa->x,
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sl_aa.y(),
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span_aa->len,
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color_span,
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span_aa->covers);
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if(--num_spans == 0) break;
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++span_aa;
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}
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}
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}
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}
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else
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{
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if(ras.sweep_scanline(sl_bin, -1))
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{
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// Clear the spans of the mix_buffer
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//--------------------
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typename ScanlineBin::const_iterator span_bin = sl_bin.begin();
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num_spans = sl_bin.num_spans();
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for(;;)
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{
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memset(mix_buffer + span_bin->x - min_x,
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0,
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span_bin->len * sizeof(color_type));
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if(--num_spans == 0) break;
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++span_bin;
|
|
}
|
|
|
|
unsigned i;
|
|
for(i = 0; i < num_styles; i++)
|
|
{
|
|
style = ras.style(i);
|
|
solid = sh.is_solid(style);
|
|
|
|
if(ras.sweep_scanline(sl_aa, i))
|
|
{
|
|
color_type* colors;
|
|
color_type* cspan;
|
|
typename ScanlineAA::cover_type* covers;
|
|
span_aa = sl_aa.begin();
|
|
num_spans = sl_aa.num_spans();
|
|
if(solid)
|
|
{
|
|
// Just solid fill
|
|
//-----------------------
|
|
for(;;)
|
|
{
|
|
color_type c = sh.color(style);
|
|
len = span_aa->len;
|
|
colors = mix_buffer + span_aa->x - min_x;
|
|
covers = span_aa->covers;
|
|
do
|
|
{
|
|
if(*covers == cover_full)
|
|
{
|
|
*colors = c;
|
|
}
|
|
else
|
|
{
|
|
colors->add(c, *covers);
|
|
}
|
|
++colors;
|
|
++covers;
|
|
}
|
|
while(--len);
|
|
if(--num_spans == 0) break;
|
|
++span_aa;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Arbitrary span generator
|
|
//-----------------------
|
|
for(;;)
|
|
{
|
|
len = span_aa->len;
|
|
colors = mix_buffer + span_aa->x - min_x;
|
|
cspan = color_span;
|
|
sh.generate_span(cspan,
|
|
span_aa->x,
|
|
sl_aa.y(),
|
|
len,
|
|
style);
|
|
covers = span_aa->covers;
|
|
do
|
|
{
|
|
if(*covers == cover_full)
|
|
{
|
|
*colors = *cspan;
|
|
}
|
|
else
|
|
{
|
|
colors->add(*cspan, *covers);
|
|
}
|
|
++cspan;
|
|
++colors;
|
|
++covers;
|
|
}
|
|
while(--len);
|
|
if(--num_spans == 0) break;
|
|
++span_aa;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Emit the blended result as a color hspan
|
|
//-------------------------
|
|
span_bin = sl_bin.begin();
|
|
num_spans = sl_bin.num_spans();
|
|
for(;;)
|
|
{
|
|
ren.blend_color_hspan(span_bin->x,
|
|
sl_bin.y(),
|
|
span_bin->len,
|
|
mix_buffer + span_bin->x - min_x,
|
|
0,
|
|
cover_full);
|
|
if(--num_spans == 0) break;
|
|
++span_bin;
|
|
}
|
|
} // if(ras.sweep_scanline(sl_bin, -1))
|
|
} // if(num_styles == 1) ... else
|
|
} // while((num_styles = ras.sweep_styles()) > 0)
|
|
} // if(ras.rewind_scanlines())
|
|
}
|
|
|
|
//=======================================render_scanlines_compound_layered
|
|
template<class Rasterizer,
|
|
class ScanlineAA,
|
|
class BaseRenderer,
|
|
class SpanAllocator,
|
|
class StyleHandler>
|
|
void render_scanlines_compound_layered(Rasterizer& ras,
|
|
ScanlineAA& sl_aa,
|
|
BaseRenderer& ren,
|
|
SpanAllocator& alloc,
|
|
StyleHandler& sh)
|
|
{
|
|
if(ras.rewind_scanlines())
|
|
{
|
|
int min_x = ras.min_x();
|
|
int len = ras.max_x() - min_x + 2;
|
|
sl_aa.reset(min_x, ras.max_x());
|
|
|
|
typedef typename BaseRenderer::color_type color_type;
|
|
color_type* color_span = alloc.allocate(len * 2);
|
|
color_type* mix_buffer = color_span + len;
|
|
cover_type* cover_buffer = ras.allocate_cover_buffer(len);
|
|
unsigned num_spans;
|
|
|
|
unsigned num_styles;
|
|
unsigned style;
|
|
bool solid;
|
|
while((num_styles = ras.sweep_styles()) > 0)
|
|
{
|
|
typename ScanlineAA::const_iterator span_aa;
|
|
if(num_styles == 1)
|
|
{
|
|
// Optimization for a single style. Happens often
|
|
//-------------------------
|
|
if(ras.sweep_scanline(sl_aa, 0))
|
|
{
|
|
style = ras.style(0);
|
|
if(sh.is_solid(style))
|
|
{
|
|
// Just solid fill
|
|
//-----------------------
|
|
render_scanline_aa_solid(sl_aa, ren, sh.color(style));
|
|
}
|
|
else
|
|
{
|
|
// Arbitrary span generator
|
|
//-----------------------
|
|
span_aa = sl_aa.begin();
|
|
num_spans = sl_aa.num_spans();
|
|
for(;;)
|
|
{
|
|
len = span_aa->len;
|
|
sh.generate_span(color_span,
|
|
span_aa->x,
|
|
sl_aa.y(),
|
|
len,
|
|
style);
|
|
|
|
ren.blend_color_hspan(span_aa->x,
|
|
sl_aa.y(),
|
|
span_aa->len,
|
|
color_span,
|
|
span_aa->covers);
|
|
if(--num_spans == 0) break;
|
|
++span_aa;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int sl_start = ras.scanline_start();
|
|
unsigned sl_len = ras.scanline_length();
|
|
|
|
if(sl_len)
|
|
{
|
|
memset(mix_buffer + sl_start - min_x,
|
|
0,
|
|
sl_len * sizeof(color_type));
|
|
|
|
memset(cover_buffer + sl_start - min_x,
|
|
0,
|
|
sl_len * sizeof(cover_type));
|
|
|
|
int sl_y = std::numeric_limits<int>::max();
|
|
unsigned i;
|
|
for(i = 0; i < num_styles; i++)
|
|
{
|
|
style = ras.style(i);
|
|
solid = sh.is_solid(style);
|
|
|
|
if(ras.sweep_scanline(sl_aa, i))
|
|
{
|
|
unsigned cover;
|
|
color_type* colors;
|
|
color_type* cspan;
|
|
cover_type* src_covers;
|
|
cover_type* dst_covers;
|
|
span_aa = sl_aa.begin();
|
|
num_spans = sl_aa.num_spans();
|
|
sl_y = sl_aa.y();
|
|
if(solid)
|
|
{
|
|
// Just solid fill
|
|
//-----------------------
|
|
for(;;)
|
|
{
|
|
color_type c = sh.color(style);
|
|
len = span_aa->len;
|
|
colors = mix_buffer + span_aa->x - min_x;
|
|
src_covers = span_aa->covers;
|
|
dst_covers = cover_buffer + span_aa->x - min_x;
|
|
do
|
|
{
|
|
cover = *src_covers;
|
|
if(*dst_covers + cover > cover_full)
|
|
{
|
|
cover = cover_full - *dst_covers;
|
|
}
|
|
if(cover)
|
|
{
|
|
colors->add(c, cover);
|
|
*dst_covers += cover;
|
|
}
|
|
++colors;
|
|
++src_covers;
|
|
++dst_covers;
|
|
}
|
|
while(--len);
|
|
if(--num_spans == 0) break;
|
|
++span_aa;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Arbitrary span generator
|
|
//-----------------------
|
|
for(;;)
|
|
{
|
|
len = span_aa->len;
|
|
colors = mix_buffer + span_aa->x - min_x;
|
|
cspan = color_span;
|
|
sh.generate_span(cspan,
|
|
span_aa->x,
|
|
sl_aa.y(),
|
|
len,
|
|
style);
|
|
src_covers = span_aa->covers;
|
|
dst_covers = cover_buffer + span_aa->x - min_x;
|
|
do
|
|
{
|
|
cover = *src_covers;
|
|
if(*dst_covers + cover > cover_full)
|
|
{
|
|
cover = cover_full - *dst_covers;
|
|
}
|
|
if(cover)
|
|
{
|
|
colors->add(*cspan, cover);
|
|
*dst_covers += cover;
|
|
}
|
|
++cspan;
|
|
++colors;
|
|
++src_covers;
|
|
++dst_covers;
|
|
}
|
|
while(--len);
|
|
if(--num_spans == 0) break;
|
|
++span_aa;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ren.blend_color_hspan(sl_start,
|
|
sl_y,
|
|
sl_len,
|
|
mix_buffer + sl_start - min_x,
|
|
0,
|
|
cover_full);
|
|
} //if(sl_len)
|
|
} //if(num_styles == 1) ... else
|
|
} //while((num_styles = ras.sweep_styles()) > 0)
|
|
} //if(ras.rewind_scanlines())
|
|
}
|
|
|
|
|
|
}
|
|
|
|
#endif
|