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annotate libinterp/corefcn/txt-eng-ft.h @ 17271:cb7233cfbf43

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Prepare base text rendering code for full TeX support. * libinterp/corefcm/oct-tex-lexer.ll: Include newlines in string characters. * libinterp/corefcn/txt-eng-ft.h (list): New include. (class ft_render::ft_font): New class. (ft_render::current_face, ft_render::push_new_line, ft_render::compute_bbox, ft_render::compute_line_xoffset): New methods. (ft_render::fonts): New member, replaces obsolete face. (ft_render::line_bbox): New member. (ft_render::halign): New member, replaces obsolete multiline_halign. (ft_render::multiline_align_xoffsets): Remove member. (class ft_render): Add comments for each class member. * libinterp/corefcn/txt-eng-ft.cc (ft_render::text_to_pixels): Use halig instead of multiline_halign. (ft_render::ft_render): Adapt to added/removed members. (ft_render::~ft_render): Likewise. (ft_render::set_font): Use fonts member instead of face. (ft_render::push_new_line, ft_render::compute_bbox, ft_render::compute_line_xoffset): New methods. (ft_render::render, ft_render::get_extent): Call compute_bbox. (ft_render::visit(text_element_string)): Remove code for handling newlines, call push_new_line instead. Remove code related to multiline_align_xoffsets.
author Michael Goffioul <michael.goffioul@gmail.com>
date Sun, 18 Aug 2013 16:36:44 -0400
parents 5b088598df1d
children 8ce6cdd272eb
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1 /*
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2
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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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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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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 reset (void);
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63
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64 uint8NDArray get_pixels (void) const { return pixels; }
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65
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66 Matrix get_boundingbox (void) const { return bbox; }
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67
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68 uint8NDArray render (text_element* elt, Matrix& box,
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69 int rotation = ROTATION_0);
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70
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71 Matrix get_extent (text_element *elt, double rotation = 0.0);
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72 Matrix get_extent (const std::string& txt, double rotation = 0.0,
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73 const caseless_str& interpreter = "tex");
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74
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75 void set_font (const std::string& name, const std::string& weight,
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76 const std::string& angle, double size);
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77
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78 void set_color (Matrix c);
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79
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80 void set_mode (int m);
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81
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82 void text_to_pixels (const std::string& txt,
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83 uint8NDArray& pixels_, Matrix& bbox,
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84 int halign, int valign, double rotation,
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85 const caseless_str& interpreter = "tex");
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86
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87 private:
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88 int rotation_to_mode (double rotation) const;
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89
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90 // No copying!
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91
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92 ft_render (const ft_render&);
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93
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94 ft_render& operator = (const ft_render&);
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95
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96 // Class to hold information about fonts and a strong
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97 // reference to the font objects loaded by freetype.
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98 class ft_font
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99 {
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100 public:
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101 std::string name;
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102 std::string weight;
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103 std::string angle;
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104 double size;
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105 FT_Face face;
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106
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107 ft_font (const std::string& nm, const std::string& wt,
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108 const std::string& ang, double sz, FT_Face f)
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109 : name (nm), weight (wt), angle (ang), size (sz), face (f) { }
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110
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111 ft_font (const ft_font& ft)
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112 : name (ft.name), weight (ft.weight), angle (ft.angle), size (ft.size)
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113 {
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114 if (FT_Reference_Face (ft.face) == 0)
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115 face = ft.face;
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116 }
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117
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118 ~ft_font (void)
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119 {
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120 if (face)
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121 FT_Done_Face (face);
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122 }
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123
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124 ft_font& operator = (const ft_font& ft)
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125 {
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126 if (&ft != this)
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127 {
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128 name = ft.name;
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129 weight = ft.weight;
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130 angle = ft.angle;
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131 size = ft.size;
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132 FT_Done_Face (face);
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133 if (FT_Reference_Face (ft.face))
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134 face = ft.face;
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135 else
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136 face = 0;
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137 }
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138
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139 return *this;
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140 }
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141
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142 private:
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143 ft_font (void);
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144 };
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145
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146 FT_Face current_face (void)
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147 { return fonts.size () ? fonts.back ().face : 0; }
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148
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149 void push_new_line (void);
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150
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151 void compute_bbox (void);
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152
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153 int compute_line_xoffset (const Matrix& lb) const;
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154
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155 private:
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156 // The stack of fonts currently used by the renderer.
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157 std::list<ft_font> fonts;
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158
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159 // Used to stored the bounding box corresponding to the rendered text.
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160 // The bounding box has the form [x, y, w, h] where x and y represent the
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161 // coordinates of the bottom left corner relative to the anchor point of
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162 // the text (== start of text on the baseline). Due to font descent or
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163 // multiple lines, the value y is usually negative.
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164 Matrix bbox;
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165
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166 // Used to stored the rendered text. It's a 3D matrix with size MxNx4
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167 // where M and N are the width and height of the bounding box.
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168 uint8NDArray pixels;
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169
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170 // Used to store the bounding box of each line. This is used to layout
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171 // multiline text properly.
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172 std::list<Matrix> line_bbox;
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173
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174 // The current horizontal alignment. This is used to align multi-line text.
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175 int halign;
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176
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177 // The current X offset for the next glyph.
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178 int xoffset;
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179
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180 // The current Y offset for the next glyph.
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181 int yoffset;
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182
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183 // The current mode of the rendering process (box computing or rendering).
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184 int mode;
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185
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186 // The base color of the rendered text.
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187 uint8_t red, green, blue;
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188 };
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189
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190 #endif // HAVE_FREETYPE
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191
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192 #endif