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Rev | Author | Line No. | Line |
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5563 | serge | 1 | /* |
2 | * Mesa 3-D graphics library |
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3 | * |
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4 | * Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de |
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5 | * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. |
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6 | * Copyright (C) 2009 VMware, Inc. All Rights Reserved. |
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7 | * |
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8 | * Permission is hereby granted, free of charge, to any person obtaining a |
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9 | * copy of this software and associated documentation files (the "Software"), |
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10 | * to deal in the Software without restriction, including without limitation |
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11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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12 | * and/or sell copies of the Software, and to permit persons to whom the |
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13 | * Software is furnished to do so, subject to the following conditions: |
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14 | * |
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15 | * The above copyright notice and this permission notice shall be included |
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16 | * in all copies or substantial portions of the Software. |
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17 | * |
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18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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22 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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23 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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24 | * OTHER DEALINGS IN THE SOFTWARE. |
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25 | */ |
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26 | |||
27 | |||
28 | /** |
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29 | * Fake implementation of glXUseXFont(). |
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30 | */ |
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31 | |||
32 | |||
33 | #include "main/core.h" |
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34 | #include |
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35 | |||
36 | |||
37 | /* Some debugging info. */ |
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38 | |||
39 | #ifdef DEBUG |
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40 | #include |
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41 | |||
42 | int debug_xfonts = 0; |
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43 | |||
44 | static void |
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45 | dump_char_struct(XCharStruct * ch, char *prefix) |
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46 | { |
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47 | printf("%slbearing = %d, rbearing = %d, width = %d\n", |
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48 | prefix, ch->lbearing, ch->rbearing, ch->width); |
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49 | printf("%sascent = %d, descent = %d, attributes = %u\n", |
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50 | prefix, ch->ascent, ch->descent, (unsigned int) ch->attributes); |
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51 | } |
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52 | |||
53 | static void |
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54 | dump_font_struct(XFontStruct * font) |
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55 | { |
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56 | printf("ascent = %d, descent = %d\n", font->ascent, font->descent); |
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57 | printf("char_or_byte2 = (%u,%u)\n", |
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58 | font->min_char_or_byte2, font->max_char_or_byte2); |
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59 | printf("byte1 = (%u,%u)\n", font->min_byte1, font->max_byte1); |
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60 | printf("all_chars_exist = %s\n", font->all_chars_exist ? "True" : "False"); |
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61 | printf("default_char = %c (\\%03o)\n", |
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62 | (char) (isprint(font->default_char) ? font->default_char : ' '), |
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63 | font->default_char); |
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64 | dump_char_struct(&font->min_bounds, "min> "); |
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65 | dump_char_struct(&font->max_bounds, "max> "); |
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66 | #if 0 |
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67 | for (c = font->min_char_or_byte2; c <= font->max_char_or_byte2; c++) { |
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68 | char prefix[8]; |
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69 | sprintf(prefix, "%d> ", c); |
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70 | dump_char_struct(&font->per_char[c], prefix); |
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71 | } |
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72 | #endif |
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73 | } |
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74 | |||
75 | static void |
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76 | dump_bitmap(unsigned int width, unsigned int height, GLubyte * bitmap) |
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77 | { |
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78 | unsigned int x, y; |
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79 | |||
80 | printf(" "); |
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81 | for (x = 0; x < 8 * width; x++) |
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82 | printf("%o", 7 - (x % 8)); |
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83 | putchar('\n'); |
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84 | for (y = 0; y < height; y++) { |
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85 | printf("%3o:", y); |
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86 | for (x = 0; x < 8 * width; x++) |
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87 | putchar((bitmap[width * (height - y - 1) + x / 8] & (1 << (7 - (x % |
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88 | 8)))) |
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89 | ? '*' : '.'); |
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90 | printf(" "); |
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91 | for (x = 0; x < width; x++) |
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92 | printf("0x%02x, ", bitmap[width * (height - y - 1) + x]); |
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93 | putchar('\n'); |
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94 | } |
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95 | } |
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96 | #endif /* DEBUG */ |
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97 | |||
98 | |||
99 | /* Implementation. */ |
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100 | |||
101 | /* Fill a BITMAP with a character C from thew current font |
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102 | in the graphics context GC. WIDTH is the width in bytes |
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103 | and HEIGHT is the height in bits. |
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104 | |||
105 | Note that the generated bitmaps must be used with |
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106 | |||
107 | glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE); |
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108 | glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE); |
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109 | glPixelStorei (GL_UNPACK_ROW_LENGTH, 0); |
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110 | glPixelStorei (GL_UNPACK_SKIP_ROWS, 0); |
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111 | glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0); |
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112 | glPixelStorei (GL_UNPACK_ALIGNMENT, 1); |
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113 | |||
114 | Possible optimizations: |
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115 | |||
116 | * use only one reusable pixmap with the maximum dimensions. |
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117 | * draw the entire font into a single pixmap (careful with |
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118 | proportional fonts!). |
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119 | */ |
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120 | |||
121 | |||
122 | /* |
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123 | * Generate OpenGL-compatible bitmap. |
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124 | */ |
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125 | static void |
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126 | fill_bitmap(Display * dpy, Window win, GC gc, |
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127 | unsigned int width, unsigned int height, |
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128 | int x0, int y0, unsigned int c, GLubyte * bitmap) |
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129 | { |
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130 | XImage *image; |
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131 | unsigned int x, y; |
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132 | Pixmap pixmap; |
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133 | XChar2b char2b; |
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134 | |||
135 | pixmap = XCreatePixmap(dpy, win, 8 * width, height, 1); |
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136 | XSetForeground(dpy, gc, 0); |
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137 | XFillRectangle(dpy, pixmap, gc, 0, 0, 8 * width, height); |
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138 | XSetForeground(dpy, gc, 1); |
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139 | |||
140 | char2b.byte1 = (c >> 8) & 0xff; |
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141 | char2b.byte2 = (c & 0xff); |
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142 | |||
143 | XDrawString16(dpy, pixmap, gc, x0, y0, &char2b, 1); |
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144 | |||
145 | image = XGetImage(dpy, pixmap, 0, 0, 8 * width, height, 1, XYPixmap); |
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146 | if (image) { |
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147 | /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */ |
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148 | for (y = 0; y < height; y++) |
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149 | for (x = 0; x < 8 * width; x++) |
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150 | if (XGetPixel(image, x, y)) |
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151 | bitmap[width * (height - y - 1) + x / 8] |= |
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152 | (1 << (7 - (x % 8))); |
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153 | XDestroyImage(image); |
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154 | } |
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155 | |||
156 | XFreePixmap(dpy, pixmap); |
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157 | } |
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158 | |||
159 | /* |
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160 | * determine if a given glyph is valid and return the |
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161 | * corresponding XCharStruct. |
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162 | */ |
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163 | static XCharStruct * |
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164 | isvalid(XFontStruct * fs, unsigned int which) |
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165 | { |
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166 | unsigned int rows, pages; |
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167 | unsigned int byte1 = 0, byte2 = 0; |
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168 | int i, valid = 1; |
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169 | |||
170 | rows = fs->max_byte1 - fs->min_byte1 + 1; |
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171 | pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1; |
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172 | |||
173 | if (rows == 1) { |
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174 | /* "linear" fonts */ |
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175 | if ((fs->min_char_or_byte2 > which) || (fs->max_char_or_byte2 < which)) |
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176 | valid = 0; |
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177 | } |
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178 | else { |
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179 | /* "matrix" fonts */ |
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180 | byte2 = which & 0xff; |
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181 | byte1 = which >> 8; |
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182 | if ((fs->min_char_or_byte2 > byte2) || |
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183 | (fs->max_char_or_byte2 < byte2) || |
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184 | (fs->min_byte1 > byte1) || (fs->max_byte1 < byte1)) |
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185 | valid = 0; |
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186 | } |
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187 | |||
188 | if (valid) { |
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189 | if (fs->per_char) { |
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190 | if (rows == 1) { |
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191 | /* "linear" fonts */ |
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192 | return (fs->per_char + (which - fs->min_char_or_byte2)); |
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193 | } |
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194 | else { |
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195 | /* "matrix" fonts */ |
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196 | i = ((byte1 - fs->min_byte1) * pages) + |
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197 | (byte2 - fs->min_char_or_byte2); |
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198 | return (fs->per_char + i); |
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199 | } |
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200 | } |
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201 | else { |
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202 | return (&fs->min_bounds); |
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203 | } |
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204 | } |
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205 | return (NULL); |
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206 | } |
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207 | |||
208 | |||
209 | PUBLIC void |
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210 | glXUseXFont(Font font, int first, int count, int listbase) |
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211 | { |
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212 | Display *dpy; |
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213 | Window win; |
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214 | Pixmap pixmap; |
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215 | GC gc; |
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216 | XGCValues values; |
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217 | unsigned long valuemask; |
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218 | XFontStruct *fs; |
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219 | GLint swapbytes, lsbfirst, rowlength; |
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220 | GLint skiprows, skippixels, alignment; |
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221 | unsigned int max_width, max_height, max_bm_width, max_bm_height; |
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222 | GLubyte *bm; |
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223 | int i; |
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224 | |||
225 | dpy = glXGetCurrentDisplay(); |
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226 | if (!dpy) |
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227 | return; /* I guess glXMakeCurrent wasn't called */ |
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228 | i = DefaultScreen(dpy); |
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229 | win = RootWindow(dpy, i); |
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230 | |||
231 | fs = XQueryFont(dpy, font); |
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232 | if (!fs) { |
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233 | _mesa_error(NULL, GL_INVALID_VALUE, |
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234 | "Couldn't get font structure information"); |
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235 | return; |
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236 | } |
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237 | |||
238 | /* Allocate a bitmap that can fit all characters. */ |
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239 | max_width = fs->max_bounds.rbearing - fs->min_bounds.lbearing; |
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240 | max_height = fs->max_bounds.ascent + fs->max_bounds.descent; |
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241 | max_bm_width = (max_width + 7) / 8; |
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242 | max_bm_height = max_height; |
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243 | |||
244 | bm = (GLubyte *) malloc((max_bm_width * max_bm_height) * sizeof(GLubyte)); |
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245 | if (!bm) { |
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246 | XFreeFontInfo(NULL, fs, 1); |
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247 | _mesa_error(NULL, GL_OUT_OF_MEMORY, |
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248 | "Couldn't allocate bitmap in glXUseXFont()"); |
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249 | return; |
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250 | } |
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251 | |||
252 | #if 0 |
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253 | /* get the page info */ |
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254 | pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1; |
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255 | firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2; |
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256 | lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2; |
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257 | rows = fs->max_byte1 - fs->min_byte1 + 1; |
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258 | unsigned int first_char, last_char, pages, rows; |
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259 | #endif |
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260 | |||
261 | /* Save the current packing mode for bitmaps. */ |
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262 | glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes); |
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263 | glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst); |
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264 | glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength); |
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265 | glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows); |
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266 | glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels); |
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267 | glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment); |
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268 | |||
269 | /* Enforce a standard packing mode which is compatible with |
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270 | fill_bitmap() from above. This is actually the default mode, |
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271 | except for the (non)alignment. */ |
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272 | glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE); |
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273 | glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE); |
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274 | glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); |
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275 | glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); |
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276 | glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); |
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277 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
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278 | |||
279 | pixmap = XCreatePixmap(dpy, win, 10, 10, 1); |
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280 | values.foreground = BlackPixel(dpy, DefaultScreen(dpy)); |
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281 | values.background = WhitePixel(dpy, DefaultScreen(dpy)); |
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282 | values.font = fs->fid; |
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283 | valuemask = GCForeground | GCBackground | GCFont; |
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284 | gc = XCreateGC(dpy, pixmap, valuemask, &values); |
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285 | XFreePixmap(dpy, pixmap); |
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286 | |||
287 | #ifdef DEBUG |
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288 | if (debug_xfonts) |
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289 | dump_font_struct(fs); |
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290 | #endif |
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291 | |||
292 | for (i = 0; i < count; i++) { |
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293 | unsigned int width, height, bm_width, bm_height; |
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294 | GLfloat x0, y0, dx, dy; |
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295 | XCharStruct *ch; |
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296 | int x, y; |
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297 | unsigned int c = first + i; |
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298 | int list = listbase + i; |
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299 | int valid; |
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300 | |||
301 | /* check on index validity and get the bounds */ |
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302 | ch = isvalid(fs, c); |
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303 | if (!ch) { |
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304 | ch = &fs->max_bounds; |
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305 | valid = 0; |
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306 | } |
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307 | else { |
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308 | valid = 1; |
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309 | } |
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310 | |||
311 | #ifdef DEBUG |
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312 | if (debug_xfonts) { |
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313 | char s[7]; |
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314 | sprintf(s, isprint(c) ? "%c> " : "\\%03o> ", c); |
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315 | dump_char_struct(ch, s); |
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316 | } |
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317 | #endif |
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318 | |||
319 | /* glBitmap()' parameters: |
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320 | straight from the glXUseXFont(3) manpage. */ |
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321 | width = ch->rbearing - ch->lbearing; |
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322 | height = ch->ascent + ch->descent; |
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323 | x0 = -ch->lbearing; |
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324 | y0 = ch->descent - 0; /* XXX used to subtract 1 here */ |
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325 | /* but that caused a conformace failure */ |
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326 | dx = ch->width; |
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327 | dy = 0; |
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328 | |||
329 | /* X11's starting point. */ |
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330 | x = -ch->lbearing; |
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331 | y = ch->ascent; |
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332 | |||
333 | /* Round the width to a multiple of eight. We will use this also |
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334 | for the pixmap for capturing the X11 font. This is slightly |
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335 | inefficient, but it makes the OpenGL part real easy. */ |
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336 | bm_width = (width + 7) / 8; |
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337 | bm_height = height; |
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338 | |||
339 | glNewList(list, GL_COMPILE); |
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340 | if (valid && (bm_width > 0) && (bm_height > 0)) { |
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341 | |||
342 | memset(bm, '\0', bm_width * bm_height); |
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343 | fill_bitmap(dpy, win, gc, bm_width, bm_height, x, y, c, bm); |
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344 | |||
345 | glBitmap(width, height, x0, y0, dx, dy, bm); |
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346 | #ifdef DEBUG |
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347 | if (debug_xfonts) { |
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348 | printf("width/height = %u/%u\n", width, height); |
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349 | printf("bm_width/bm_height = %u/%u\n", bm_width, bm_height); |
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350 | dump_bitmap(bm_width, bm_height, bm); |
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351 | } |
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352 | #endif |
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353 | } |
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354 | else { |
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355 | glBitmap(0, 0, 0.0, 0.0, dx, dy, NULL); |
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356 | } |
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357 | glEndList(); |
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358 | } |
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359 | |||
360 | free(bm); |
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361 | XFreeFontInfo(NULL, fs, 1); |
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362 | XFreeGC(dpy, gc); |
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363 | |||
364 | /* Restore saved packing modes. */ |
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365 | glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes); |
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366 | glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst); |
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367 | glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength); |
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368 | glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows); |
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369 | glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels); |
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370 | glPixelStorei(GL_UNPACK_ALIGNMENT, alignment); |
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371 | }>><>><>>>>><>>>>><>>>>=> |