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#ifndef AGG_SPAN_ALLOCATOR_INCLUDED
17#define AGG_SPAN_ALLOCATOR_INCLUDED
18
19#include "agg_array.h"
20
21namespace agg
22{
23    //----------------------------------------------------------span_allocator
24    template<class ColorT> class span_allocator
25    {
26    public:
27        typedef ColorT color_type;
28
29        //--------------------------------------------------------------------
30        AGG_INLINE color_type* allocate(unsigned span_len)
31        {
32            if(span_len > m_span.size())
33            {
34                // To reduce the number of reallocs we align the
35                // span_len to 256 color elements.
36                // Well, I just like this number and it looks reasonable.
37                //-----------------------
38                m_span.resize(((span_len + 255) >> 8) << 8);
39            }
40            return &m_span[0];
41        }
42
43        AGG_INLINE color_type* span()               { return &m_span[0]; }
44        AGG_INLINE unsigned    max_span_len() const { return m_span.size(); }
45
46    private:
47        pod_array<color_type> m_span;
48    };
49}
50
51
52#endif
53
54
55