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annotate mde/resource/font.d @ 45:0fd51d2c6c8a

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Several changes to resising windows and layout widgets. This commit still has some bugs. Moved the implementable widgets from mde.gui.widget.Widget to miscWidgets, leaving base widgets in Widget. Rewrote some of GridLayoutWidget's implementation. Made many operations general to work for either columns or rows. Some optimisations were intended but ended up being removed due to problems. Allowed layout's to resize from either direction (only with window resizes). committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Thu, 22 May 2008 11:34:09 +0100
parents 07bd1a09e161
children a98ffb64f066
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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15
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16 /// Sets up freetype (in a basic way).
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17 module mde.resource.font;
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18
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19 import mde.resource.exception;
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20
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21 import derelict.freetype.ft;
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22 import derelict.opengl.gl;
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23
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24 import tango.stdc.stringz;
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25 import tango.util.log.Log : Log, Logger;
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26
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27 private Logger logger;
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28 static this () {
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29 logger = Log.getLogger ("mde.resource.font");
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30 }
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31
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32 /** Font class.
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33 *
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34 * Particular to a font and size. (Maybe not size?)
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35 *
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36 * Note: it is not currently intended to be thread-safe. */
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37 class Font
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38 {
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39 //BEGIN Static: manager
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40 static {
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41 /** Load the freetype library. */
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42 void initialize () {
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43 if (FT_Init_FreeType (&library))
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44 throw new fontException ("error initialising the FreeType library");
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45 }
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46
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47 //FIXME: don't use GC for Font resources
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48 /** Cleanup: delete all fonts. */
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49 void cleanup () {
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50 if (font)
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51 delete font;
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52
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53 FT_Done_FreeType (library);
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54 }
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55
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56 /** Get a font.
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57 *
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58 * Later specify font/size.
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59 *
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60 * Throws:
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61 * fontLoadException when unable to load the font. */
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62 Font get(char[] path) {
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63 if (font is null) font = new Font(path);
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64 return font;
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65 }
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66
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67 private:
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68 FT_Library library;
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69 Font font;
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70 }
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71 //END Static
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72
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73
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74 /** Load & cache a new font. */
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75 this (char[] path)
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76 in {
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77 assert (library !is null, "font: library is null");
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78 } body {
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79 if (FT_New_Face (library, toStringz(path), 0, &face))
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80 throw new fontLoadException ("Unable to read font: "~path);
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81
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82 if (FT_Set_Pixel_Sizes (face, 0,16))
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83 throw new fontLoadException ("Unable to set pixel size");
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84 }
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85
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86 void drawStr (int x, int y, char[] str) {
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87 FT_Vector pen = { x*64, y*64 };
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88 auto g = face.glyph;
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89
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90 FT_Matrix m;
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91 m.xx = 0x10000;
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92 m.xy = m.yx = 0;
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93 m.yy = -0x10000;
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94
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95 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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96
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97 FT_Pos y_adj = 0; // y adjustment (for height)
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98
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99 FT_Bool useKerning = FT_HAS_KERNING (face);
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100 FT_UInt previous = 0;
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101
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102 foreach (chr; str) {
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103 auto gi = FT_Get_Char_Index (face, chr);
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104
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105 if (useKerning && previous && gi)
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106 {
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107 FT_Vector delta;
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108
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109
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110 FT_Get_Kerning (face, previous, gi, FT_Kerning_Mode.FT_KERNING_DEFAULT, &delta);
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111
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112 pen.x += delta.x;
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113 }
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114
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115 FT_Set_Transform(face, &m, &pen);
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116 if (FT_Load_Glyph(face, gi, FT_LOAD_RENDER))
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117 return; // give up
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118
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119 if (y_adj < g.metrics.height) y_adj = g.metrics.height;
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120
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121 auto b = g.bitmap;
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122 if (b.pixel_mode != FT_Pixel_Mode.FT_PIXEL_MODE_GRAY || b.num_grays != 256) {
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123 char[128] tmp;
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124 logger.warn (logger.format (tmp,"Unsupported freetype bitmap format: {}, {}", b.pixel_mode, b.num_grays));
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125 return;
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126 }
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127 if (b.pitch != b.width)
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128 logger.info ("b.pitch != b.width");
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129
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130 //NOTE: y direction!
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131 glRasterPos2i (g.bitmap_left,g.bitmap_top /+ (y_adj >> 6)+/);
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132 glDrawPixels (b.width, b.rows, GL_LUMINANCE, GL_UNSIGNED_BYTE, cast(void*) b.buffer);
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133
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134 pen.x += g.advance.x;
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135 pen.y += g.advance.y;
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136 previous = gi;
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137 }
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138 }
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139
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140 ~this () {
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141 FT_Done_Face (face);
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142 }
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143
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144 private:
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Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff changeset
145 FT_Face face;
07bd1a09e161 Started implementing text rendering.
Diggory Hardy <diggory.hardy@gmail.com>
parents:
diff changeset
146 }