agg/inc/agg_span_pattern_rgba.h

   1 //----------------------------------------------------------------------------
   2 // Anti-Grain Geometry - Version 2.3
   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 #include "agg_pixfmt_rgba.h"
  30 #include "agg_span_pattern.h"
  31
  32 namespace agg
  33 {
  34
  35     //======================================================span_pattern_rgba
  36     template<class ColorT,
  37              class Order,
  38              class WrapModeX,
  39              class WrapModeY,
  40              class Allocator = span_allocator<ColorT> >
  41     class span_pattern_rgba : public span_pattern_base<ColorT, Allocator>
  42     {
  43     public:
  44         typedef ColorT color_type;
  45         typedef Order order_type;
  46         typedef Allocator alloc_type;
  47         typedef span_pattern_base<color_type, alloc_type> base_type;
  48         typedef typename color_type::value_type value_type;
  49         typedef typename color_type::calc_type calc_type;
  50         enum
  51         {
  52             base_shift = color_type::base_shift,
  53             base_mask  = color_type::base_mask
  54         };
  55
  56         //--------------------------------------------------------------------
  57         span_pattern_rgba(alloc_type& alloc) :
  58             base_type(alloc),
  59             m_wrap_mode_x(1),
  60             m_wrap_mode_y(1)
  61         {}
  62
  63         //----------------------------------------------------------------
  64         span_pattern_rgba(alloc_type& alloc,
  65                           const rendering_buffer& src,
  66                           unsigned offset_x, unsigned offset_y) :
  67             base_type(alloc, src, offset_x, offset_y, 0),
  68             m_wrap_mode_x(src.width()),
  69             m_wrap_mode_y(src.height())
  70         {}
  71
  72         //-------------------------------------------------------------------
  73         void source_image(const rendering_buffer& src)
  74         {
  75             base_type::source_image(src);
  76             m_wrap_mode_x = WrapModeX(src.width());
  77             m_wrap_mode_y = WrapModeY(src.height());
  78         }
  79
  80         //--------------------------------------------------------------------
  81         color_type* generate(int x, int y, unsigned len)
  82         {
  83             color_type* span = base_type::allocator().span();
  84             unsigned sx = m_wrap_mode_x(base_type::offset_x() + x);
  85             const value_type* row_ptr =
  86                 (const value_type*)base_type::source_image().row(
  87                     m_wrap_mode_y(
  88                         base_type::offset_y() + y));
  89             do
  90             {
  91                 const value_type* p = row_ptr + (sx << 2);
  92                 span->r = p[order_type::R];
  93                 span->g = p[order_type::G];
  94                 span->b = p[order_type::B];
  95                 span->a = p[order_type::A];
  96                 sx = ++m_wrap_mode_x;
  97                 ++span;
  98             }
  99             while(--len);
 100             return base_type::allocator().span();
 101         }
 102
 103     private:
 104         WrapModeX m_wrap_mode_x;
 105         WrapModeY m_wrap_mode_y;
 106     };
 107
 108 }
 109
 110 #endif
 111