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| 1 | 1 | 
| 2 //---------------------------------------------------------------------------- | 2 //---------------------------------------------------------------------------- | 
| 3 // Anti-Grain Geometry - Version 2.3 | 3 // Anti-Grain Geometry - Version 2.3 | 
| 4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) | 4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) | 
| 5 // | 5 // | 
| 6 // Permission to copy, use, modify, sell and distribute this software | 6 // Permission to copy, use, modify, sell and distribute this software | 
| 7 // is granted provided this copyright notice appears in all copies. | 7 // is granted provided this copyright notice appears in all copies. | 
| 8 // This software is provided "as is" without express or implied | 8 // This software is provided "as is" without express or implied | 
| 9 // warranty, and with no claim as to its suitability for any purpose. | 9 // warranty, and with no claim as to its suitability for any purpose. | 
| 10 // | 10 // | 
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| 21 // PostScript and PDF technology for software developers. | 21 // PostScript and PDF technology for software developers. | 
| 22 // | 22 // | 
| 23 //---------------------------------------------------------------------------- | 23 //---------------------------------------------------------------------------- | 
| 24 #ifndef AGG_PIXFMT_GRAY_INCLUDED | 24 #ifndef AGG_PIXFMT_GRAY_INCLUDED | 
| 25 #define AGG_PIXFMT_GRAY_INCLUDED | 25 #define AGG_PIXFMT_GRAY_INCLUDED | 
| 26 #include "agg_basics.h" | 26 #include "agg_basics.h" | 
| 27 #include "agg_color_gray.h" | 27 #include "agg_color_gray.h" | 
| 28 #include "agg_rendering_buffer.h" | 28 #include "agg_rendering_buffer.h" | 
| 29 namespace agg | 29 namespace agg | 
| 30 { | 30 { | 
| 31 template<class ColorT> struct blender_gray : public CFX_Object { | 31 template<class ColorT> struct blender_gray  { | 
| 32     typedef ColorT color_type; | 32     typedef ColorT color_type; | 
| 33     typedef typename color_type::value_type value_type; | 33     typedef typename color_type::value_type value_type; | 
| 34     typedef typename color_type::calc_type calc_type; | 34     typedef typename color_type::calc_type calc_type; | 
| 35     enum base_scale_e { base_shift = color_type::base_shift }; | 35     enum base_scale_e { base_shift = color_type::base_shift }; | 
| 36     static AGG_INLINE void blend_pix(value_type* p, unsigned cv, | 36     static AGG_INLINE void blend_pix(value_type* p, unsigned cv, | 
| 37                                      unsigned alpha, unsigned cover = 0) | 37                                      unsigned alpha, unsigned cover = 0) | 
| 38     { | 38     { | 
| 39         *p = (value_type)((((cv - calc_type(*p)) * alpha) + (calc_type(*p) << ba
     se_shift)) >> base_shift); | 39         *p = (value_type)((((cv - calc_type(*p)) * alpha) + (calc_type(*p) << ba
     se_shift)) >> base_shift); | 
| 40     } | 40     } | 
| 41 }; | 41 }; | 
| 42 template<class Blender, unsigned Step = 1, unsigned Offset = 0> | 42 template<class Blender, unsigned Step = 1, unsigned Offset = 0> | 
| 43 class pixel_formats_gray : public CFX_Object | 43 class pixel_formats_gray | 
| 44 { | 44 { | 
| 45 public: | 45 public: | 
| 46     typedef rendering_buffer::row_data row_data; | 46     typedef rendering_buffer::row_data row_data; | 
| 47     typedef rendering_buffer::span_data span_data; | 47     typedef rendering_buffer::span_data span_data; | 
| 48     typedef typename Blender::color_type color_type; | 48     typedef typename Blender::color_type color_type; | 
| 49     typedef typename color_type::value_type value_type; | 49     typedef typename color_type::value_type value_type; | 
| 50     typedef typename color_type::calc_type calc_type; | 50     typedef typename color_type::calc_type calc_type; | 
| 51     enum base_scale_e { | 51     enum base_scale_e { | 
| 52         base_shift = color_type::base_shift, | 52         base_shift = color_type::base_shift, | 
| 53         base_size  = color_type::base_size, | 53         base_size  = color_type::base_size, | 
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| 168             } while(--len); | 168             } while(--len); | 
| 169         } | 169         } | 
| 170     } | 170     } | 
| 171 private: | 171 private: | 
| 172     rendering_buffer* m_rbuf; | 172     rendering_buffer* m_rbuf; | 
| 173 }; | 173 }; | 
| 174 typedef blender_gray<gray8>      blender_gray8; | 174 typedef blender_gray<gray8>      blender_gray8; | 
| 175 typedef pixel_formats_gray<blender_gray8, 1, 0> pixfmt_gray8; | 175 typedef pixel_formats_gray<blender_gray8, 1, 0> pixfmt_gray8; | 
| 176 } | 176 } | 
| 177 #endif | 177 #endif | 
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