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annotate libinterp/corefcn/txt-eng-ft.h @ 17274:0a09d4b40767

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Combine successive TeX super- and subscript elements. * libinterp/corefcn/oct-tex-parser.yy (combined_script_element): New rule. Add %nonassoc statements to control precedence and resolve shoft/reduce conflicts. * libinterp/corefcn/txt-eng.h (class text_element_combined): New class. (text_processor::visit(text_element_combined)): New method. * libinterp/corefcn/txt-eng-ft.h (ft_render::visit(text_element_combined)): Likewise. * libinterp/corefcn/txt-eng-ft.cc (ft_render::push_new_line): Reset xoffset/yoffset in MODE_BBOX mode. (ft_render::process_character): Use xoffset as the current X advancement and update the line bbox accordingly. (ft_render::visit(text_element_combined)): New method.
author Michael Goffioul <michael.goffioul@gmail.com>
date Sun, 18 Aug 2013 21:39:27 -0400
parents 8ce6cdd272eb
children 219552139c18
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1 /*
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2
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72c96de7a403 maint: update copyright notices for 2012
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3 Copyright (C) 2009-2012 Michael Goffioul
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if ! defined (txt_eng_ft_h)
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24 #define txt_eng_ft_h 1
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25
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26 #if HAVE_FREETYPE
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27
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28 #include <list>
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29 #include <vector>
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30
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31 #include <ft2build.h>
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32 #include FT_FREETYPE_H
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33
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34 #include <dMatrix.h>
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35 #include <uint8NDArray.h>
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36 #include "txt-eng.h"
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37
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38 class
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39 OCTINTERP_API
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40 ft_render : public text_processor
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41 {
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42 public:
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43 enum {
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44 MODE_BBOX = 0,
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45 MODE_RENDER = 1
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46 };
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47
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48 enum {
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49 ROTATION_0 = 0,
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50 ROTATION_90 = 1,
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51 ROTATION_180 = 2,
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52 ROTATION_270 = 3
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53 };
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54
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55 public:
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56 ft_render (void);
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57
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58 ~ft_render (void);
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59
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60 void visit (text_element_string& e);
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61
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62 void visit (text_element_list& e);
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63
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64 void visit (text_element_subscript& e);
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65
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66 void visit (text_element_superscript& e);
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67
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68 void visit (text_element_color& e);
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69
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70 void visit (text_element_fontsize& e);
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71
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72 void visit (text_element_fontname& e);
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73
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74 void visit (text_element_fontstyle& e);
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75
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76 void visit (text_element_symbol& e);
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77
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78 void visit (text_element_combined& e);
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79
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80 void reset (void);
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81
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82 uint8NDArray get_pixels (void) const { return pixels; }
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83
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84 Matrix get_boundingbox (void) const { return bbox; }
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85
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86 uint8NDArray render (text_element* elt, Matrix& box,
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87 int rotation = ROTATION_0);
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88
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89 Matrix get_extent (text_element *elt, double rotation = 0.0);
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90 Matrix get_extent (const std::string& txt, double rotation = 0.0,
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91 const caseless_str& interpreter = "tex");
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92
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93 void set_font (const std::string& name, const std::string& weight,
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94 const std::string& angle, double size);
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95
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96 void set_color (Matrix c);
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97
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98 void set_mode (int m);
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99
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100 void text_to_pixels (const std::string& txt,
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101 uint8NDArray& pixels_, Matrix& bbox,
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102 int halign, int valign, double rotation,
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103 const caseless_str& interpreter = "tex");
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104
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105 private:
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106 int rotation_to_mode (double rotation) const;
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107
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108 // No copying!
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109
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110 ft_render (const ft_render&);
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111
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112 ft_render& operator = (const ft_render&);
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113
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114 // Class to hold information about fonts and a strong
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115 // reference to the font objects loaded by freetype.
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116 class ft_font
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117 {
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118 public:
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119 std::string name;
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120 std::string weight;
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121 std::string angle;
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122 double size;
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123 FT_Face face;
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124
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125 ft_font (void)
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126 : name (), weight (), angle (), size (0), face (0) { }
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127
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128 ft_font (const std::string& nm, const std::string& wt,
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129 const std::string& ang, double sz, FT_Face f)
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130 : name (nm), weight (wt), angle (ang), size (sz), face (f) { }
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131
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132 ft_font (const ft_font& ft)
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133 : name (ft.name), weight (ft.weight), angle (ft.angle),
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134 size (ft.size), face (0)
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135 {
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136 if (FT_Reference_Face (ft.face) == 0)
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137 face = ft.face;
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138 }
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139
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140 ~ft_font (void)
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141 {
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142 if (face)
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143 FT_Done_Face (face);
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144 }
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145
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146 ft_font& operator = (const ft_font& ft)
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147 {
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148 if (&ft != this)
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149 {
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150 name = ft.name;
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151 weight = ft.weight;
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152 angle = ft.angle;
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153 size = ft.size;
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154 FT_Done_Face (face);
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155 if (FT_Reference_Face (ft.face) == 0)
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156 face = ft.face;
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157 else
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158 face = 0;
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159 }
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160
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161 return *this;
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162 }
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163
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164 bool is_valid (void) const { return face; }
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165 };
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166
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167 void push_new_line (void);
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168
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169 void update_line_bbox (void);
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170
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171 void compute_bbox (void);
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172
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173 int compute_line_xoffset (const Matrix& lb) const;
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174
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175 FT_UInt process_character (FT_ULong code, FT_UInt previous = 0);
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176
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177 private:
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178 // The current font used by the renderer.
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179 ft_font font;
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180
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181 // Used to stored the bounding box corresponding to the rendered text.
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182 // The bounding box has the form [x, y, w, h] where x and y represent the
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183 // coordinates of the bottom left corner relative to the anchor point of
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184 // the text (== start of text on the baseline). Due to font descent or
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185 // multiple lines, the value y is usually negative.
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186 Matrix bbox;
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187
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188 // Used to stored the rendered text. It's a 3D matrix with size MxNx4
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189 // where M and N are the width and height of the bounding box.
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190 uint8NDArray pixels;
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191
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192 // Used to store the bounding box of each line. This is used to layout
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193 // multiline text properly.
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194 std::list<Matrix> line_bbox;
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195
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196 // The current horizontal alignment. This is used to align multi-line text.
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197 int halign;
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198
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199 // The X offset for the next glyph.
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200 int xoffset;
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201
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202 // The Y offset of the baseline for the current line.
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203 int line_yoffset;
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204
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205 // The Y offset of the baseline for the next glyph. The offset is relative
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206 // to line_yoffset. The total Y offset is computed with:
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207 // line_yoffset + yoffset.
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208 int yoffset;
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209
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210 // The current mode of the rendering process (box computing or rendering).
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211 int mode;
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212
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213 // The base color of the rendered text.
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214 uint8NDArray color;
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215 };
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216
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217 #endif // HAVE_FREETYPE
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218
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219 #endif