1 2 //---------------------------------------------------------------------------- 3 // Anti-Grain Geometry - Version 2.3 4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) 5 // 6 // Permission to copy, use, modify, sell and distribute this software 7 // is granted provided this copyright notice appears in all copies. 8 // This software is provided "as is" without express or implied 9 // warranty, and with no claim as to its suitability for any purpose. 10 // 11 //---------------------------------------------------------------------------- 12 // Contact: mcseem (at) antigrain.com 13 // mcseemagg (at) yahoo.com 14 // http://www.antigrain.com 15 //---------------------------------------------------------------------------- 16 // 17 // class renderer_base 18 // 19 //---------------------------------------------------------------------------- 20 #ifndef AGG_RENDERER_BASE_INCLUDED 21 #define AGG_RENDERER_BASE_INCLUDED 22 #include "agg_basics.h" 23 #include "agg_rendering_buffer.h" 24 namespace agg 25 { 26 template<class PixelFormat> class renderer_base 27 { 28 public: 29 typedef PixelFormat pixfmt_type; 30 typedef typename pixfmt_type::color_type color_type; 31 typedef typename pixfmt_type::row_data row_data; 32 typedef typename pixfmt_type::span_data span_data; 33 renderer_base() : m_ren(0), m_clip_box(1, 1, 0, 0) {} 34 renderer_base(pixfmt_type& ren) : 35 m_ren(&ren), 36 m_clip_box(0, 0, ren.width() - 1, ren.height() - 1) 37 {} 38 void attach(pixfmt_type& ren) 39 { 40 m_ren = &ren; 41 m_clip_box = rect(0, 0, ren.width() - 1, ren.height() - 1); 42 } 43 const pixfmt_type& ren() const 44 { 45 return *m_ren; 46 } 47 pixfmt_type& ren() 48 { 49 return *m_ren; 50 } 51 unsigned width() const 52 { 53 return m_ren->width(); 54 } 55 unsigned height() const 56 { 57 return m_ren->height(); 58 } 59 void first_clip_box() {} 60 bool next_clip_box() 61 { 62 return false; 63 } 64 const rect& clip_box() const 65 { 66 return m_clip_box; 67 } 68 int xmin() const 69 { 70 return m_clip_box.x1; 71 } 72 int ymin() const 73 { 74 return m_clip_box.y1; 75 } 76 int xmax() const 77 { 78 return m_clip_box.x2; 79 } 80 int ymax() const 81 { 82 return m_clip_box.y2; 83 } 84 const rect& bounding_clip_box() const 85 { 86 return m_clip_box; 87 } 88 int bounding_xmin() const 89 { 90 return m_clip_box.x1; 91 } 92 int bounding_ymin() const 93 { 94 return m_clip_box.y1; 95 } 96 int bounding_xmax() const 97 { 98 return m_clip_box.x2; 99 } 100 int bounding_ymax() const 101 { 102 return m_clip_box.y2; 103 } 104 void blend_hline(int x1, int y, int x2, 105 const color_type& c, cover_type cover) 106 { 107 if(x1 > x2) { 108 int t = x2; 109 x2 = x1; 110 x1 = t; 111 } 112 if(y > ymax()) { 113 return; 114 } 115 if(y < ymin()) { 116 return; 117 } 118 if(x1 > xmax()) { 119 return; 120 } 121 if(x2 < xmin()) { 122 return; 123 } 124 if(x1 < xmin()) { 125 x1 = xmin(); 126 } 127 if(x2 > xmax()) { 128 x2 = xmax(); 129 } 130 m_ren->blend_hline(x1, y, x2 - x1 + 1, c, cover); 131 } 132 void blend_solid_hspan(int x, int y, int len, 133 const color_type& c, 134 const cover_type* covers) 135 { 136 if(y > ymax()) { 137 return; 138 } 139 if(y < ymin()) { 140 return; 141 } 142 if(x < xmin()) { 143 len -= xmin() - x; 144 if(len <= 0) { 145 return; 146 } 147 covers += xmin() - x; 148 x = xmin(); 149 } 150 if(x + len > xmax()) { 151 len = xmax() - x + 1; 152 if(len <= 0) { 153 return; 154 } 155 } 156 m_ren->blend_solid_hspan(x, y, len, c, covers); 157 } 158 private: 159 pixfmt_type* m_ren; 160 rect m_clip_box; 161 }; 162 } 163 #endif 164
