78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 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_SPAN_PATTERN_RGBA32_INCLUDED
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#define AGG_SPAN_PATTERN_RGBA32_INCLUDED
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#include "agg_basics.h"
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#include "agg_pixfmt_rgba32.h"
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#include "agg_span_pattern.h"
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namespace agg
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{
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//======================================================span_pattern_rgba32
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template<class Order, class Allocator = span_allocator<rgba8> >
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class span_pattern_rgba32 : public span_pattern<rgba8, int8u, Allocator>
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{
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public:
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typedef Allocator alloc_type;
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typedef rgba8 color_type;
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typedef span_pattern<color_type, int8u, alloc_type> base_type;
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//--------------------------------------------------------------------
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span_pattern_rgba32(alloc_type& alloc) : base_type(alloc) {}
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//----------------------------------------------------------------
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span_pattern_rgba32(alloc_type& alloc,
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const rendering_buffer& src,
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unsigned offset_x, unsigned offset_y) :
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base_type(alloc, src, offset_x, offset_y, 0)
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{}
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//--------------------------------------------------------------------
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color_type* generate(int x, int y, unsigned len)
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{
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color_type* span = base_type::allocator().span();
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unsigned sx = (base_type::offset_x() + x) % base_type::source_image().width();
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unsigned wp = base_type::source_image().width() << 2;
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const int8u* p = base_type::source_image().row((base_type::offset_y() + y) % base_type::source_image().height());
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p += sx << 2;
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do
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{
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span->r = p[Order::R];
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span->g = p[Order::G];
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span->b = p[Order::B];
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span->a = p[Order::A];
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p += 4;
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++sx;
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++span;
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if(sx >= base_type::source_image().width())
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{
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sx -= base_type::source_image().width();
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p -= wp;
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}
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}
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while(--len);
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return base_type::allocator().span();
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}
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};
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}
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#endif
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