agg/inc/agg_span_allocator.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 #ifndef AGG_SPAN_ALLOCATOR_INCLUDED
  17 #define AGG_SPAN_ALLOCATOR_INCLUDED
  18
  19 #include "agg_basics.h"
  20
  21 namespace agg
  22 {
  23     //----------------------------------------------------------span_allocator
  24     template<class ColorT> class span_allocator
  25     {
  26     public:
  27         typedef ColorT color_type;
  28
  29         //--------------------------------------------------------------------
  30         ~span_allocator()
  31         {
  32             delete [] m_span;
  33         }
  34
  35         //--------------------------------------------------------------------
  36         span_allocator() :
  37             m_max_span_len(0),
  38             m_span(0)
  39         {
  40         }
  41
  42         //--------------------------------------------------------------------
  43         color_type* allocate(unsigned max_span_len)
  44         {
  45             if(max_span_len > m_max_span_len)
  46             {
  47                 delete [] m_span;
  48                 m_span = new color_type[m_max_span_len = max_span_len];
  49             }
  50             return m_span;
  51         }
  52
  53         //--------------------------------------------------------------------
  54         color_type* span()
  55         {
  56             return m_span;
  57         }
  58
  59     private:
  60         //--------------------------------------------------------------------
  61         span_allocator(const span_allocator<ColorT>&);
  62         const span_allocator<ColorT>& operator = (const span_allocator<ColorT>&);
  63
  64         unsigned    m_max_span_len;
  65         color_type* m_span;
  66     };
  67 }
  68
  69
  70 #endif
  71
  72