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annotate src/gl2ps-renderer.cc @ 11455:2be9e22796d2

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improvements in text-extent calculation
author Konstantinos Poulios <logari81@googlemail.com>
date Thu, 06 Jan 2011 20:46:03 +0100
parents 2786e3b7072e
children fd0a3ac60b0e
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1 /*
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2
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3 Copyright (C) 2009 Shai Ayal
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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 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #if defined (HAVE_OPENGL)
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28
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29 #include <cstdio>
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30
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31 #include "lo-mappers.h"
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32 #include "oct-locbuf.h"
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33
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34 #include "gl2ps-renderer.h"
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35 #include "gl2ps.h"
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36
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37 void
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38 glps_renderer::draw (const graphics_object& go)
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39 {
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40 static bool in_draw = false;
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41
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42 if (!in_draw)
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43 {
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44 in_draw = true;
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45
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46 FILE *fp = fdopen (fid, "wb");
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47 GLint buffsize = 0, state = GL2PS_OVERFLOW;
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48 GLint viewport[4];
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49
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50 glGetIntegerv (GL_VIEWPORT, viewport);
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51
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52 GLint gl2ps_term;
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53 if (term.find ("eps") != std::string::npos) gl2ps_term = GL2PS_EPS;
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54 else if (term.find ("pdf") != std::string::npos) gl2ps_term = GL2PS_PDF;
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55 else if (term.find ("svg") != std::string::npos) gl2ps_term = GL2PS_SVG;
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56 else if (term.find ("ps") != std::string::npos) gl2ps_term = GL2PS_PS;
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57 else if (term.find ("pgf") != std::string::npos) gl2ps_term = GL2PS_PGF;
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58 else if (term.find ("tex") != std::string::npos) gl2ps_term = GL2PS_TEX;
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59 else
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60 {
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61 error ("gl2ps-renderer:: Unknown terminal");
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62 return;
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63 }
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64
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65 GLint gl2ps_text = 0;
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66 if (term.find ("notxt") != std::string::npos) gl2ps_text = GL2PS_NO_TEXT;
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67
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68 while (state == GL2PS_OVERFLOW)
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69 {
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70 buffsize += 1024*1024;
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71 gl2psBeginPage ("glps_renderer figure", "Octave", viewport,
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72 gl2ps_term, GL2PS_BSP_SORT,
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73 (GL2PS_SILENT | GL2PS_SIMPLE_LINE_OFFSET
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74 | GL2PS_NO_BLENDING | GL2PS_OCCLUSION_CULL
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75 | GL2PS_BEST_ROOT | gl2ps_text),
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76 GL_RGBA, 0, NULL, 0, 0, 0,
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77 buffsize, fp, "" );
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78
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79 opengl_renderer::draw (go);
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80 state = gl2psEndPage ();
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81 }
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82
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83 gnulib::fclose (fp);
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84
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85 in_draw = 0;
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86 }
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87 else
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88 opengl_renderer::draw (go);
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89 }
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90
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91 int
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92 glps_renderer::alignment_to_mode (int ha, int va) const
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93 {
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94 int gl2psa=GL2PS_TEXT_BL;
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95 if (ha == 0)
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96 {
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97 if (va == 0 || va == 3)
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98 gl2psa=GL2PS_TEXT_BL;
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99 else if (va == 2)
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100 gl2psa=GL2PS_TEXT_TL;
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101 else if (va == 1)
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102 gl2psa=GL2PS_TEXT_CL;
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103 }
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104 else if (ha == 2)
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105 {
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106 if (va == 0 || va == 3)
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107 gl2psa=GL2PS_TEXT_BR;
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108 else if (va == 2)
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109 gl2psa=GL2PS_TEXT_TR;
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110 else if (va == 1)
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111 gl2psa=GL2PS_TEXT_CR;
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112 }
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113 else if (ha == 1)
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114 {
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115 if (va == 0 || va == 3)
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116 gl2psa=GL2PS_TEXT_B;
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117 else if (va == 2)
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118 gl2psa=GL2PS_TEXT_T;
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119 else if (va == 1)
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120 gl2psa=GL2PS_TEXT_C;
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121 }
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122 return gl2psa;
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123 }
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124
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125 Matrix
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126 glps_renderer::render_text (const std::string& txt,
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127 double x, double y, double z,
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128 int ha, int va, double rotation)
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129 {
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130 if (txt.empty ())
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131 return Matrix (1, 4, 0.0);
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132
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133 glRasterPos3d (x, y, z);
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134 gl2psTextOpt (txt.c_str (), fontname.c_str (), fontsize,
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135 alignment_to_mode (ha, va), rotation);
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136
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137 // FIXME? -- we have no way of getting a bounding box from gl2ps, so
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138 // we use freetype
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139 Matrix bbox;
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140 uint8NDArray pixels;
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141 text_to_pixels (txt, pixels, bbox, 0, 0, rotation);
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142 return bbox;
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143 }
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144
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145 void
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146 glps_renderer::set_font (const base_properties& props)
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147 {
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148 opengl_renderer::set_font (props);
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149
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150 fontsize = props.get ("fontsize").double_value ();
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151
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152 caseless_str fn = props.get ("fontname").string_value ();
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153 fontname = "";
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154 if (fn == "times" || fn == "times-roman")
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155 fontname = "Times-Roman";
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156 else if (fn == "courier")
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157 fontname = "Courier";
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158 else if (fn == "symbol")
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159 fontname = "Symbol";
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160 else if (fn == "zapfdingbats")
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161 fontname = "ZapfDingbats";
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162 else
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163 fontname = "Helvetica";
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164
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165 // FIXME -- add support for bold and italic
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166 }
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167
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168 template <typename T>
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169 static void
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170 draw_pixels (GLsizei w, GLsizei h, GLenum format, const T *data)
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171 {
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172 OCTAVE_LOCAL_BUFFER (GLfloat, a, 3*w*h);
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173
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174 for (int i = 0; i < 3*w*h; i++)
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175 a[i] = data[i];
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176
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177 gl2psDrawPixels (w, h, 0, 0, format, GL_FLOAT, a);
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178 }
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179
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180 void
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181 glps_renderer::draw_pixels (GLsizei w, GLsizei h, GLenum format,
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182 GLenum type, const GLvoid *data)
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183 {
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184 if (type == GL_UNSIGNED_SHORT)
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185 ::draw_pixels (w, h, format, static_cast<const GLushort *> (data));
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186 else if (type == GL_UNSIGNED_BYTE)
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187 ::draw_pixels (w, h, format, static_cast<const GLubyte *> (data));
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188 else
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189 gl2psDrawPixels (w, h, 0, 0, format, type, data);
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190 }
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191
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192 void
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193 glps_renderer::draw_text (const text::properties& props)
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194 {
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195 if (props.get_string ().empty ())
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196 return;
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197
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198 set_font (props);
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199 set_color (props.get_color_rgb ());
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200
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201 const Matrix pos = get_transform ().scale (props.get_data_position ());
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202 int halign = 0, valign = 0;
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203
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204 if (props.horizontalalignment_is ("center"))
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205 halign = 1;
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206 else if (props.horizontalalignment_is ("right"))
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207 halign = 2;
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208
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209 if (props.verticalalignment_is ("top"))
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210 valign = 2;
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211 else if (props.verticalalignment_is ("baseline"))
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212 valign = 3;
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213 else if (props.verticalalignment_is ("middle"))
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214 valign = 1;
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215
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216 // FIXME: handle margin and surrounding box
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217
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218 glRasterPos3d (pos(0), pos(1), pos(2));
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219 gl2psTextOpt (props.get_string ().c_str (), fontname.c_str (), fontsize,
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220 alignment_to_mode (halign, valign), props.get_rotation ());
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221
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222 }
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223
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224 #endif