94 lines
3.2 KiB
C++
94 lines
3.2 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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//
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// Adaptation for high precision colors has been sponsored by
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// Liberty Technology Systems, Inc., visit http://lib-sys.com
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//
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// Liberty Technology Systems, Inc. is the provider of
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// PostScript and PDF technology for software developers.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_SPAN_PATTERN_GRAY_INCLUDED
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#define AGG_SPAN_PATTERN_GRAY_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//=======================================================span_pattern_gray
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template<class Source> class span_pattern_gray
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{
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public:
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typedef Source source_type;
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typedef typename source_type::color_type color_type;
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typedef typename color_type::value_type value_type;
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typedef typename color_type::calc_type calc_type;
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//--------------------------------------------------------------------
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span_pattern_gray() {}
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span_pattern_gray(source_type& src,
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unsigned offset_x, unsigned offset_y) :
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m_src(&src),
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m_offset_x(offset_x),
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m_offset_y(offset_y),
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m_alpha(color_type::base_mask)
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{}
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//--------------------------------------------------------------------
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void attach(source_type& v) { m_src = &v; }
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source_type& source() { return *m_src; }
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const source_type& source() const { return *m_src; }
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//--------------------------------------------------------------------
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void offset_x(unsigned v) { m_offset_x = v; }
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void offset_y(unsigned v) { m_offset_y = v; }
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unsigned offset_x() const { return m_offset_x; }
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unsigned offset_y() const { return m_offset_y; }
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void alpha(value_type v) { m_alpha = v; }
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value_type alpha() const { return m_alpha; }
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//--------------------------------------------------------------------
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void prepare() {}
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void generate(color_type* span, int x, int y, unsigned len)
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{
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x += m_offset_x;
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y += m_offset_y;
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const value_type* p = (const value_type*)m_src->span(x, y, len);
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do
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{
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span->v = *p;
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span->a = m_alpha;
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p = m_src->next_x();
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++span;
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}
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while(--len);
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}
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private:
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source_type* m_src;
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unsigned m_offset_x;
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unsigned m_offset_y;
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value_type m_alpha;
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};
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}
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#endif
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