headers/libs/agg/agg_span_pattern_rgba.h

   1 //----------------------------------------------------------------------------
   2 // Anti-Grain Geometry - Version 2.4
   3 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
   4 //
   5 // Permission to copy, use, modify, sell and distribute this software
   6 // is granted provided this copyright notice appears in all copies.
   7 // This software is provided "as is" without express or implied
   8 // warranty, and with no claim as to its suitability for any purpose.
   9 //
  10 //----------------------------------------------------------------------------
  11 // Contact: mcseem@antigrain.com
  12 //          mcseemagg@yahoo.com
  13 //          http://www.antigrain.com
  14 //----------------------------------------------------------------------------
  15 //
  16 // Adaptation for high precision colors has been sponsored by
  17 // Liberty Technology Systems, Inc., visit http://lib-sys.com
  18 //
  19 // Liberty Technology Systems, Inc. is the provider of
  20 // PostScript and PDF technology for software developers.
  21 //
  22 //----------------------------------------------------------------------------
  23
  24
  25 #ifndef AGG_SPAN_PATTERN_RGBA_INCLUDED
  26 #define AGG_SPAN_PATTERN_RGBA_INCLUDED
  27
  28 #include "agg_basics.h"
  29
  30 namespace agg
  31 {
  32
  33     //======================================================span_pattern_rgba
  34     template<class Source> class span_pattern_rgba
  35     {
  36     public:
  37         typedef Source source_type;
  38         typedef typename source_type::color_type color_type;
  39         typedef typename source_type::order_type order_type;
  40         typedef typename color_type::value_type value_type;
  41         typedef typename color_type::calc_type calc_type;
  42
  43         //--------------------------------------------------------------------
  44         span_pattern_rgba() {}
  45         span_pattern_rgba(source_type& src,
  46                           unsigned offset_x, unsigned offset_y) :
  47             m_src(&src),
  48             m_offset_x(offset_x),
  49             m_offset_y(offset_y)
  50         {}
  51
  52         //--------------------------------------------------------------------
  53         void   attach(source_type& v)      { m_src = &v; }
  54                source_type& source()       { return *m_src; }
  55         const  source_type& source() const { return *m_src; }
  56
  57         //--------------------------------------------------------------------
  58         void       offset_x(unsigned v) { m_offset_x = v; }
  59         void       offset_y(unsigned v) { m_offset_y = v; }
  60         unsigned   offset_x() const { return m_offset_x; }
  61         unsigned   offset_y() const { return m_offset_y; }
  62         void       alpha(value_type) {}
  63         value_type alpha() const { return 0; }
  64
  65         //--------------------------------------------------------------------
  66         void prepare() {}
  67         void generate(color_type* span, int x, int y, unsigned len)
  68         {
  69             x += m_offset_x;
  70             y += m_offset_y;
  71             const value_type* p = (const value_type*)m_src->span(x, y, len);
  72             do
  73             {
  74                 span->r = p[order_type::R];
  75                 span->g = p[order_type::G];
  76                 span->b = p[order_type::B];
  77                 span->a = p[order_type::A];
  78                 p = (const value_type*)m_src->next_x();
  79                 ++span;
  80             }
  81             while(--len);
  82         }
  83
  84     private:
  85         source_type* m_src;
  86         unsigned     m_offset_x;
  87         unsigned     m_offset_y;
  88
  89     };
  90
  91 }
  92
  93 #endif
  94