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102 lines
3.7 KiB
C++
102 lines
3.7 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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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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