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 21 namespace agg 22 { 23 //----------------------------------------------------------span_allocator 24 template<class ColorT> class span_allocator 25 { 26 public: 27 typedef ColorT color_type; 28 29 //-------------------------------------------------------------------- allocate(unsigned span_len)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 span()43 AGG_INLINE color_type* span() { return &m_span[0]; } max_span_len()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