1 | |
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2 | /* Copyright (c) Mark J. Kilgard, 1997. */ |
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3 | |
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4 | /* This program is freely distributable without licensing fees and is |
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5 | provided without guarantee or warrantee expressed or implied. This |
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6 | program is -not- in the public domain. */ |
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7 | |
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8 | /* X compile line: cc -o gentexfont gentexfont.c -lX11 */ |
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9 | |
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10 | #include <assert.h> |
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11 | #include <stdlib.h> |
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12 | #include <stdio.h> |
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13 | #include <string.h> |
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14 | #include <unistd.h> |
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15 | #include <X11/Xlib.h> |
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16 | #include <X11/Xutil.h> |
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17 | #include <math.h> |
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18 | |
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19 | #include "TexFont.h" |
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20 | |
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21 | typedef struct { |
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22 | short width; |
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23 | short height; |
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24 | short xoffset; |
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25 | short yoffset; |
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26 | short advance; |
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27 | unsigned char *bitmap; |
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28 | } PerGlyphInfo, *PerGlyphInfoPtr; |
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29 | |
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30 | typedef struct { |
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31 | int min_char; |
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32 | int max_char; |
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33 | int max_ascent; |
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34 | int max_descent; |
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35 | PerGlyphInfo glyph[1]; |
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36 | } FontInfo, *FontInfoPtr; |
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37 | |
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38 | Display *dpy; |
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39 | FontInfoPtr fontinfo; |
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40 | int format = TXF_FORMAT_BITMAP; |
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41 | int gap = 1; |
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42 | |
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43 | /* #define REPORT_GLYPHS */ |
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44 | #ifdef REPORT_GLYPHS |
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45 | #define DEBUG_GLYPH4(msg,a,b,c,d) printf(msg,a,b,c,d) |
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46 | #define DEBUG_GLYPH(msg) printf(msg) |
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47 | #else |
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48 | #define DEBUG_GLYPH4(msg,a,b,c,d) { /* nothing */ } |
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49 | #define DEBUG_GLYPH(msg) { /* nothing */ } |
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50 | #endif |
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51 | |
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52 | #define MAX_GLYPHS_PER_GRAB 512 /* this is big enough for 2^9 glyph |
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53 | character sets */ |
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54 | |
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55 | FontInfoPtr |
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56 | SuckGlyphsFromServer(Display * dpy, Font font) |
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57 | { |
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58 | Pixmap offscreen; |
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59 | XFontStruct *fontinfo; |
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60 | XImage *image; |
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61 | GC xgc; |
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62 | XGCValues values; |
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63 | int numchars; |
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64 | int width, height, pixwidth; |
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65 | int i, j; |
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66 | XCharStruct *charinfo; |
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67 | XChar2b character; |
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68 | unsigned char *bitmapData; |
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69 | int x, y; |
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70 | int spanLength; |
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71 | int charWidth, charHeight, maxSpanLength; |
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72 | int grabList[MAX_GLYPHS_PER_GRAB]; |
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73 | int glyphsPerGrab = MAX_GLYPHS_PER_GRAB; |
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74 | int numToGrab, thisglyph; |
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75 | FontInfoPtr myfontinfo; |
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76 | |
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77 | fontinfo = XQueryFont(dpy, font); |
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78 | if (!fontinfo) |
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79 | return NULL; |
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80 | |
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81 | numchars = fontinfo->max_char_or_byte2 - fontinfo->min_char_or_byte2 + 1; |
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82 | if (numchars < 1) |
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83 | return NULL; |
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84 | |
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85 | myfontinfo = (FontInfoPtr) malloc(sizeof(FontInfo) + (numchars - 1) * sizeof(PerGlyphInfo)); |
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86 | if (!myfontinfo) |
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87 | return NULL; |
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88 | |
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89 | myfontinfo->min_char = fontinfo->min_char_or_byte2; |
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90 | myfontinfo->max_char = fontinfo->max_char_or_byte2; |
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91 | myfontinfo->max_ascent = fontinfo->max_bounds.ascent; |
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92 | myfontinfo->max_descent = fontinfo->max_bounds.descent; |
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93 | |
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94 | width = fontinfo->max_bounds.rbearing - fontinfo->min_bounds.lbearing; |
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95 | height = fontinfo->max_bounds.ascent + fontinfo->max_bounds.descent; |
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96 | |
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97 | maxSpanLength = (width + 7) / 8; |
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98 | /* Be careful determining the width of the pixmap; the X protocol allows |
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99 | pixmaps of width 2^16-1 (unsigned short size) but drawing coordinates |
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100 | max out at 2^15-1 (signed short size). If the width is too large, we |
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101 | need to limit the glyphs per grab. */ |
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102 | if ((glyphsPerGrab * 8 * maxSpanLength) >= (1 << 15)) { |
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103 | glyphsPerGrab = (1 << 15) / (8 * maxSpanLength); |
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104 | } |
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105 | pixwidth = glyphsPerGrab * 8 * maxSpanLength; |
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106 | offscreen = XCreatePixmap(dpy, RootWindow(dpy, DefaultScreen(dpy)), |
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107 | pixwidth, height, 1); |
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108 | |
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109 | values.font = font; |
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110 | values.background = 0; |
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111 | values.foreground = 0; |
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112 | xgc = XCreateGC(dpy, offscreen, GCFont | GCBackground | GCForeground, &values); |
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113 | |
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114 | XFillRectangle(dpy, offscreen, xgc, 0, 0, 8 * maxSpanLength * glyphsPerGrab, height); |
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115 | XSetForeground(dpy, xgc, 1); |
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116 | |
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117 | numToGrab = 0; |
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118 | if (fontinfo->per_char == NULL) { |
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119 | charinfo = &(fontinfo->min_bounds); |
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120 | charWidth = charinfo->rbearing - charinfo->lbearing; |
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121 | charHeight = charinfo->ascent + charinfo->descent; |
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122 | spanLength = (charWidth + 7) / 8; |
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123 | } |
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124 | for (i = 0; i < numchars; i++) { |
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125 | if (fontinfo->per_char != NULL) { |
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126 | charinfo = &(fontinfo->per_char[i]); |
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127 | charWidth = charinfo->rbearing - charinfo->lbearing; |
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128 | charHeight = charinfo->ascent + charinfo->descent; |
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129 | if (charWidth == 0 || charHeight == 0) { |
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130 | /* Still must move raster pos even if empty character */ |
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131 | myfontinfo->glyph[i].width = 0; |
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132 | myfontinfo->glyph[i].height = 0; |
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133 | myfontinfo->glyph[i].xoffset = 0; |
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134 | myfontinfo->glyph[i].yoffset = 0; |
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135 | myfontinfo->glyph[i].advance = charinfo->width; |
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136 | myfontinfo->glyph[i].bitmap = NULL; |
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137 | goto PossiblyDoGrab; |
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138 | } |
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139 | } |
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140 | grabList[numToGrab] = i; |
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141 | |
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142 | /* XXX is this right for large fonts? */ |
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143 | character.byte2 = (i + fontinfo->min_char_or_byte2) & 255; |
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144 | character.byte1 = (i + fontinfo->min_char_or_byte2) >> 8; |
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145 | |
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146 | /* XXX we could use XDrawImageString16 which would also paint the backing |
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147 | |
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148 | rectangle but X server bugs in some scalable font rasterizers makes it |
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149 | |
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150 | more effective to do XFillRectangles to clear the pixmap and |
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151 | XDrawImage16 for the text. */ |
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152 | XDrawString16(dpy, offscreen, xgc, |
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153 | -charinfo->lbearing + 8 * maxSpanLength * numToGrab, |
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154 | charinfo->ascent, &character, 1); |
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155 | |
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156 | numToGrab++; |
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157 | |
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158 | PossiblyDoGrab: |
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159 | |
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160 | if (numToGrab >= glyphsPerGrab || i == numchars - 1) { |
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161 | image = XGetImage(dpy, offscreen, |
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162 | 0, 0, pixwidth, height, 1, XYPixmap); |
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163 | for (j = 0; j < numToGrab; j++) { |
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164 | thisglyph = grabList[j]; |
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165 | if (fontinfo->per_char != NULL) { |
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166 | charinfo = &(fontinfo->per_char[thisglyph]); |
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167 | charWidth = charinfo->rbearing - charinfo->lbearing; |
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168 | charHeight = charinfo->ascent + charinfo->descent; |
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169 | spanLength = (charWidth + 7) / 8; |
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170 | } |
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171 | bitmapData = calloc(height * spanLength, sizeof(char)); |
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172 | if (!bitmapData) |
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173 | goto FreeFontAndReturn; |
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174 | DEBUG_GLYPH4("index %d, glyph %d (%d by %d)\n", |
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175 | j, thisglyph + fontinfo->min_char_or_byte2, charWidth, charHeight); |
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176 | for (y = 0; y < charHeight; y++) { |
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177 | for (x = 0; x < charWidth; x++) { |
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178 | /* XXX The algorithm used to suck across the font ensures that |
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179 | each glyph begins on a byte boundary. In theory this would |
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180 | make it convienent to copy the glyph into a byte oriented |
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181 | bitmap. We actually use the XGetPixel function to extract |
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182 | each pixel from the image which is not that efficient. We |
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183 | could either do tighter packing in the pixmap or more |
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184 | efficient extraction from the image. Oh well. */ |
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185 | if (XGetPixel(image, j * maxSpanLength * 8 + x, charHeight - 1 - y)) { |
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186 | DEBUG_GLYPH("x"); |
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187 | bitmapData[y * spanLength + x / 8] |= (1 << (x & 7)); |
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188 | } else { |
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189 | DEBUG_GLYPH(" "); |
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190 | } |
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191 | } |
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192 | DEBUG_GLYPH("\n"); |
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193 | } |
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194 | myfontinfo->glyph[thisglyph].width = charWidth; |
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195 | myfontinfo->glyph[thisglyph].height = charHeight; |
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196 | myfontinfo->glyph[thisglyph].xoffset = charinfo->lbearing; |
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197 | myfontinfo->glyph[thisglyph].yoffset = -charinfo->descent; |
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198 | myfontinfo->glyph[thisglyph].advance = charinfo->width; |
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199 | myfontinfo->glyph[thisglyph].bitmap = bitmapData; |
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200 | } |
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201 | XDestroyImage(image); |
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202 | numToGrab = 0; |
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203 | /* do we need to clear the offscreen pixmap to get more? */ |
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204 | if (i < numchars - 1) { |
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205 | XSetForeground(dpy, xgc, 0); |
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206 | XFillRectangle(dpy, offscreen, xgc, 0, 0, 8 * maxSpanLength * glyphsPerGrab, height); |
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207 | XSetForeground(dpy, xgc, 1); |
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208 | } |
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209 | } |
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210 | } |
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211 | XFreeGC(dpy, xgc); |
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212 | XFreePixmap(dpy, offscreen); |
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213 | return myfontinfo; |
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214 | |
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215 | FreeFontAndReturn: |
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216 | XDestroyImage(image); |
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217 | XFreeGC(dpy, xgc); |
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218 | XFreePixmap(dpy, offscreen); |
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219 | for (j = i - 1; j >= 0; j--) { |
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220 | if (myfontinfo->glyph[j].bitmap) |
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221 | free(myfontinfo->glyph[j].bitmap); |
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222 | } |
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223 | free(myfontinfo); |
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224 | return NULL; |
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225 | } |
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226 | |
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227 | void |
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228 | printGlyph(FontInfoPtr font, int c) |
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229 | { |
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230 | PerGlyphInfoPtr glyph; |
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231 | unsigned char *bitmapData; |
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232 | int width, height, spanLength; |
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233 | int x, y; |
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234 | |
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235 | if (c < font->min_char || c > font->max_char) { |
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236 | printf("out of range glyph\n"); |
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237 | return; |
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238 | } |
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239 | glyph = &font->glyph[c - font->min_char]; |
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240 | bitmapData = glyph->bitmap; |
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241 | if (bitmapData) { |
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242 | width = glyph->width; |
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243 | spanLength = (width + 7) / 8; |
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244 | height = glyph->height; |
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245 | |
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246 | for (y = 0; y < height; y++) { |
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247 | for (x = 0; x < width; x++) { |
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248 | if (bitmapData[y * spanLength + x / 8] & (1 << (x & 7))) { |
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249 | putchar('X'); |
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250 | } else { |
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251 | putchar('.'); |
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252 | } |
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253 | } |
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254 | putchar('\n'); |
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255 | } |
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256 | } |
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257 | } |
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258 | |
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259 | void |
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260 | getMetric(FontInfoPtr font, int c, TexGlyphInfo * tgi) |
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261 | { |
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262 | PerGlyphInfoPtr glyph; |
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263 | unsigned char *bitmapData; |
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264 | |
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265 | tgi->c = c; |
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266 | if (c < font->min_char || c > font->max_char) { |
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267 | tgi->width = 0; |
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268 | tgi->height = 0; |
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269 | tgi->xoffset = 0; |
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270 | tgi->yoffset = 0; |
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271 | tgi->dummy = 0; |
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272 | tgi->advance = 0; |
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273 | return; |
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274 | } |
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275 | glyph = &font->glyph[c - font->min_char]; |
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276 | bitmapData = glyph->bitmap; |
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277 | if (bitmapData) { |
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278 | tgi->width = glyph->width; |
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279 | tgi->height = glyph->height; |
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280 | tgi->xoffset = glyph->xoffset; |
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281 | tgi->yoffset = glyph->yoffset; |
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282 | } else { |
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283 | tgi->width = 0; |
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284 | tgi->height = 0; |
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285 | tgi->xoffset = 0; |
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286 | tgi->yoffset = 0; |
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287 | } |
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288 | tgi->dummy = 0; |
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289 | tgi->advance = glyph->advance; |
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290 | } |
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291 | |
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292 | int |
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293 | glyphCompare(const void *a, const void *b) |
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294 | { |
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295 | unsigned char *c1 = (unsigned char *) a; |
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296 | unsigned char *c2 = (unsigned char *) b; |
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297 | TexGlyphInfo tgi1; |
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298 | TexGlyphInfo tgi2; |
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299 | |
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300 | getMetric(fontinfo, *c1, &tgi1); |
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301 | getMetric(fontinfo, *c2, &tgi2); |
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302 | return tgi2.height - tgi1.height; |
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303 | } |
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304 | |
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305 | int |
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306 | getFontel(unsigned char *bitmapData, int spanLength, int i, int j) |
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307 | { |
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308 | return bitmapData[i * spanLength + j / 8] & (1 << (j & 7)) ? 255 : 0; |
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309 | } |
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310 | |
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311 | void |
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312 | placeGlyph(FontInfoPtr font, int c, unsigned char *texarea, int stride, int x, int y) |
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313 | { |
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314 | PerGlyphInfoPtr glyph; |
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315 | unsigned char *bitmapData; |
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316 | int width, height, spanLength; |
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317 | int i, j; |
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318 | |
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319 | if (c < font->min_char || c > font->max_char) { |
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320 | printf("out of range glyph\n"); |
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321 | return; |
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322 | } |
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323 | glyph = &font->glyph[c - font->min_char]; |
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324 | bitmapData = glyph->bitmap; |
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325 | if (bitmapData) { |
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326 | width = glyph->width; |
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327 | spanLength = (width + 7) / 8; |
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328 | height = glyph->height; |
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329 | |
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330 | for (i = 0; i < height; i++) { |
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331 | for (j = 0; j < width; j++) { |
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332 | texarea[stride * (y + i) + x + j] = |
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333 | getFontel(bitmapData, spanLength, i, j); |
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334 | } |
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335 | } |
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336 | } |
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337 | } |
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338 | |
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339 | char * |
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340 | nodupstring(char *s) |
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341 | { |
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342 | int len, i, p; |
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343 | char *new; |
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344 | |
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345 | len = strlen(s); |
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346 | new = (char *) calloc(len + 1, 1); |
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347 | p = 0; |
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348 | for (i = 0; i < len; i++) { |
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349 | if (!strchr(new, s[i])) { |
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350 | new[p] = s[i]; |
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351 | p++; |
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352 | } |
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353 | } |
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354 | new = realloc(new, p + 1); |
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355 | return new; |
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356 | } |
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357 | |
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358 | int |
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359 | main(int argc, char *argv[]) |
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360 | { |
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361 | int texw, texh; |
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362 | unsigned char *texarea, *texbitmap; |
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363 | FILE *file; |
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364 | int len, stride; |
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365 | unsigned char *glist; |
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366 | int width, height; |
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367 | int px, py, maxheight; |
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368 | TexGlyphInfo tgi; |
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369 | int usageError = 0; |
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370 | char *fontname, *filename; |
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371 | XFontStruct *xfont; |
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372 | int endianness; |
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373 | int i, j; |
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374 | |
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375 | texw = texh = 256; |
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376 | glist = " ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijmklmnopqrstuvwxyz?.;,!*:\"/+@#$%^&()"; |
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377 | fontname = "-adobe-courier-bold-r-normal--46-*-100-100-m-*-iso8859-1"; |
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378 | filename = "default.txf"; |
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379 | |
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380 | for (i = 1; i < argc; i++) { |
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381 | if (!strcmp(argv[i], "-w")) { |
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382 | i++; |
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383 | texw = atoi(argv[i]); |
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384 | } else if (!strcmp(argv[i], "-h")) { |
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385 | i++; |
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386 | texh = atoi(argv[i]); |
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387 | } else if (!strcmp(argv[i], "-gap")) { |
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388 | i++; |
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389 | gap = atoi(argv[i]); |
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390 | } else if (!strcmp(argv[i], "-byte")) { |
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391 | format = TXF_FORMAT_BYTE; |
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392 | break; |
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393 | } else if (!strcmp(argv[i], "-bitmap")) { |
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394 | format = TXF_FORMAT_BITMAP; |
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395 | } else if (!strcmp(argv[i], "-glist")) { |
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396 | i++; |
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397 | glist = (unsigned char *) argv[i]; |
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398 | } else if (!strcmp(argv[i], "-fn")) { |
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399 | i++; |
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400 | fontname = argv[i]; |
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401 | } else if (!strcmp(argv[i], "-file")) { |
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402 | i++; |
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403 | filename = argv[i]; |
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404 | } else { |
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405 | usageError = 1; |
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406 | } |
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407 | } |
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408 | |
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409 | if (usageError) { |
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410 | putchar('\n'); |
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411 | printf("usage: texfontgen [options] txf-file\n"); |
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412 | printf(" -w # textureWidth (def=%d)\n", texw); |
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413 | printf(" -h # textureHeight (def=%d)\n", texh); |
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414 | printf(" -gap # gap between glyphs (def=%d)\n", gap); |
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415 | printf(" -bitmap use a bitmap encoding (default)\n"); |
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416 | printf(" -byte use a byte encoding (less compact)\n"); |
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417 | printf(" -glist ABC glyph list (def=%s)\n", glist); |
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418 | printf(" -fn name X font name (def=%s)\n", fontname); |
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419 | printf(" -file name output file for textured font (def=%s)\n", fontname); |
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420 | putchar('\n'); |
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421 | exit(1); |
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422 | } |
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423 | texarea = calloc(texw * texh, sizeof(unsigned char)); |
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424 | glist = (unsigned char *) nodupstring((char *) glist); |
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425 | |
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426 | dpy = XOpenDisplay(NULL); |
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427 | if (!dpy) { |
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428 | printf("could not open display\n"); |
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429 | exit(1); |
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430 | } |
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431 | /* find an OpenGL-capable RGB visual with depth buffer */ |
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432 | xfont = XLoadQueryFont(dpy, fontname); |
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433 | if (!xfont) { |
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434 | printf("could not get load X font: %s\n", fontname); |
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435 | exit(1); |
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436 | } |
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437 | fontinfo = SuckGlyphsFromServer(dpy, xfont->fid); |
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438 | if (!fontinfo) { |
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439 | printf("could not get font glyphs\n"); |
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440 | exit(1); |
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441 | } |
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442 | len = strlen((char *) glist); |
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443 | qsort(glist, len, sizeof(unsigned char), glyphCompare); |
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444 | |
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445 | file = fopen(filename, "wb"); |
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446 | fwrite("\377txf", 1, 4, file); |
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447 | endianness = 0x12345678; |
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448 | assert(sizeof(int) == 4); /* Ensure external file format size. */ |
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449 | fwrite(&endianness, sizeof(int), 1, file); |
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450 | fwrite(&format, sizeof(int), 1, file); |
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451 | fwrite(&texw, sizeof(int), 1, file); |
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452 | fwrite(&texh, sizeof(int), 1, file); |
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453 | fwrite(&fontinfo->max_ascent, sizeof(int), 1, file); |
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454 | fwrite(&fontinfo->max_descent, sizeof(int), 1, file); |
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455 | fwrite(&len, sizeof(int), 1, file); |
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456 | |
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457 | px = gap; |
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458 | py = gap; |
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459 | maxheight = 0; |
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460 | for (i = 0; i < len; i++) { |
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461 | if (glist[i] != 0) { /* If not already processed... */ |
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462 | |
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463 | /* Try to find a character from the glist that will fit on the |
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464 | remaining space on the current row. */ |
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465 | |
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466 | int foundWidthFit = 0; |
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467 | int c; |
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468 | |
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469 | getMetric(fontinfo, glist[i], &tgi); |
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470 | width = tgi.width; |
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471 | height = tgi.height; |
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472 | if (height > 0 && width > 0) { |
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473 | for (j = i; j < len;) { |
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474 | if (height > 0 && width > 0) { |
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475 | if (px + width + gap < texw) { |
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476 | foundWidthFit = 1; |
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477 | if (j != i) { |
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478 | i--; /* Step back so i loop increment leaves us at same character. */ |
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479 | } |
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480 | break; |
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481 | } |
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482 | } |
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483 | j++; |
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484 | getMetric(fontinfo, glist[j], &tgi); |
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485 | width = tgi.width; |
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486 | height = tgi.height; |
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487 | } |
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488 | |
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489 | /* If a fit was found, use that character; otherwise, advance a line |
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490 | in the texture. */ |
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491 | if (foundWidthFit) { |
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492 | if (height > maxheight) { |
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493 | maxheight = height; |
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494 | } |
---|
495 | c = j; |
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496 | } else { |
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497 | getMetric(fontinfo, glist[i], &tgi); |
---|
498 | width = tgi.width; |
---|
499 | height = tgi.height; |
---|
500 | |
---|
501 | py += maxheight + gap; |
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502 | px = gap; |
---|
503 | maxheight = height; |
---|
504 | if (py + height + gap >= texh) { |
---|
505 | printf("Overflowed texture space.\n"); |
---|
506 | exit(1); |
---|
507 | } |
---|
508 | c = i; |
---|
509 | } |
---|
510 | |
---|
511 | /* Place the glyph in the texture image. */ |
---|
512 | placeGlyph(fontinfo, glist[c], texarea, texw, px, py); |
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513 | |
---|
514 | /* Assign glyph's texture coordinate. */ |
---|
515 | tgi.x = px; |
---|
516 | tgi.y = py; |
---|
517 | |
---|
518 | /* Advance by glyph width, remaining in the current line. */ |
---|
519 | px += width + gap; |
---|
520 | } else { |
---|
521 | /* No texture image; assign invalid bogus texture coordinates. */ |
---|
522 | tgi.x = -1; |
---|
523 | tgi.y = -1; |
---|
524 | } |
---|
525 | glist[c] = 0; /* Mark processed; don't process again. */ |
---|
526 | assert(sizeof(tgi) == 12); /* Ensure external file format size. */ |
---|
527 | fwrite(&tgi, sizeof(tgi), 1, file); |
---|
528 | } |
---|
529 | } |
---|
530 | |
---|
531 | switch (format) { |
---|
532 | case TXF_FORMAT_BYTE: |
---|
533 | fwrite(texarea, texw * texh, 1, file); |
---|
534 | break; |
---|
535 | case TXF_FORMAT_BITMAP: |
---|
536 | stride = (texw + 7) >> 3; |
---|
537 | texbitmap = (unsigned char *) calloc(stride * texh, 1); |
---|
538 | for (i = 0; i < texh; i++) { |
---|
539 | for (j = 0; j < texw; j++) { |
---|
540 | if (texarea[i * texw + j] >= 128) { |
---|
541 | texbitmap[i * stride + (j >> 3)] |= 1 << (j & 7); |
---|
542 | } |
---|
543 | } |
---|
544 | } |
---|
545 | fwrite(texbitmap, stride * texh, 1, file); |
---|
546 | free(texbitmap); |
---|
547 | break; |
---|
548 | default: |
---|
549 | printf("Unknown texture font format.\n"); |
---|
550 | exit(1); |
---|
551 | } |
---|
552 | free(texarea); |
---|
553 | fclose(file); |
---|
554 | return 0; |
---|
555 | } |
---|