1 //---------------------------------------------------------------------------- 2 // Anti-Grain Geometry (AGG) - Version 2.5 3 // A high quality rendering engine for C++ 4 // Copyright (C) 2002-2006 Maxim Shemanarev 5 // Contact: mcseem@antigrain.com 6 // mcseemagg@yahoo.com 7 // http://antigrain.com 8 // 9 // AGG is free software; you can redistribute it and/or 10 // modify it under the terms of the GNU General Public License 11 // as published by the Free Software Foundation; either version 2 12 // of the License, or (at your option) any later version. 13 // 14 // AGG is distributed in the hope that it will be useful, 15 // but WITHOUT ANY WARRANTY; without even the implied warranty of 16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 // GNU General Public License for more details. 18 // 19 // You should have received a copy of the GNU General Public License 20 // along with AGG; if not, write to the Free Software 21 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 22 // MA 02110-1301, USA. 23 //---------------------------------------------------------------------------- 24 25 #ifndef AGG_SPAN_ALLOCATOR_INCLUDED 26 #define AGG_SPAN_ALLOCATOR_INCLUDED 27 28 #include "agg_array.h" 29 30 namespace agg 31 { 32 //----------------------------------------------------------span_allocator 33 template<class ColorT> class span_allocator 34 { 35 public: 36 typedef ColorT color_type; 37 38 //-------------------------------------------------------------------- allocate(unsigned span_len)39 AGG_INLINE color_type* allocate(unsigned span_len) 40 { 41 if(span_len > m_span.size()) 42 { 43 // To reduce the number of reallocs we align the 44 // span_len to 256 color elements. 45 // Well, I just like this number and it looks reasonable. 46 //----------------------- 47 m_span.resize(((span_len + 255) >> 8) << 8); 48 } 49 return &m_span[0]; 50 } 51 span()52 AGG_INLINE color_type* span() { return &m_span[0]; } max_span_len()53 AGG_INLINE unsigned max_span_len() const { return m_span.size(); } 54 55 private: 56 pod_array<color_type> m_span; 57 }; 58 } 59 60 61 #endif 62 63 64