headers/libs/agg/agg_gsv_text.h

   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 // Class gsv_text
  17 //
  18 //----------------------------------------------------------------------------
  19
  20 #ifndef AGG_GSV_TEXT_INCLUDED
  21 #define AGG_GSV_TEXT_INCLUDED
  22
  23 #include "agg_array.h"
  24 #include "agg_conv_stroke.h"
  25 #include "agg_conv_transform.h"
  26
  27 namespace agg
  28 {
  29
  30
  31     //---------------------------------------------------------------gsv_text
  32     //
  33     // See Implementation agg_gsv_text.cpp
  34     //
  35     class gsv_text
  36     {
  37         enum status
  38         {
  39             initial,
  40             next_char,
  41             start_glyph,
  42             glyph
  43         };
  44
  45     public:
  46         gsv_text();
  47
  48         void font(const void* font);
  49         void flip(bool flip_y) { m_flip = flip_y; }
  50         void load_font(const char* file);
  51         void size(double height, double width=0.0);
  52         void space(double space);
  53         void line_space(double line_space);
  54         void start_point(double x, double y);
  55         void text(const char* text);
  56
  57         void rewind(unsigned path_id);
  58         unsigned vertex(double* x, double* y);
  59
  60     private:
  61         // not supposed to be copied
  62         gsv_text(const gsv_text&);
  63         const gsv_text& operator = (const gsv_text&);
  64
  65         int16u value(const int8u* p) const
  66         {
  67             int16u v;
  68             if(m_big_endian)
  69             {
  70                  *(int8u*)&v      = p[1];
  71                 *((int8u*)&v + 1) = p[0];
  72             }
  73             else
  74             {
  75                  *(int8u*)&v      = p[0];
  76                 *((int8u*)&v + 1) = p[1];
  77             }
  78             return v;
  79         }
  80
  81     private:
  82         double          m_x;
  83         double          m_y;
  84         double          m_start_x;
  85         double          m_width;
  86         double          m_height;
  87         double          m_space;
  88         double          m_line_space;
  89         char            m_chr[2];
  90         char*           m_text;
  91         pod_array<char> m_text_buf;
  92         char*           m_cur_chr;
  93         const void*     m_font;
  94         pod_array<char> m_loaded_font;
  95         status          m_status;
  96         bool            m_big_endian;
  97         bool            m_flip;
  98         int8u*          m_indices;
  99         int8*           m_glyphs;
 100         int8*           m_bglyph;
 101         int8*           m_eglyph;
 102         double          m_w;
 103         double          m_h;
 104     };
 105
 106
 107
 108
 109     //--------------------------------------------------------gsv_text_outline
 110     template<class Transformer = trans_affine> class gsv_text_outline
 111     {
 112     public:
 113         gsv_text_outline(gsv_text& text, const Transformer& trans) :
 114           m_polyline(text),
 115           m_trans(m_polyline, trans)
 116         {
 117         }
 118
 119         void width(double w)
 120         {
 121             m_polyline.width(w);
 122         }
 123
 124         void transformer(const Transformer* trans)
 125         {
 126             m_trans->transformer(trans);
 127         }
 128
 129         void rewind(unsigned path_id)
 130         {
 131             m_trans.rewind(path_id);
 132             m_polyline.line_join(round_join);
 133             m_polyline.line_cap(round_cap);
 134         }
 135
 136         unsigned vertex(double* x, double* y)
 137         {
 138             return m_trans.vertex(x, y);
 139         }
 140
 141     private:
 142         conv_stroke<gsv_text> m_polyline;
 143         conv_transform<conv_stroke<gsv_text>, Transformer> m_trans;
 144     };
 145
 146
 147
 148 }
 149
 150
 151 #endif