1 FreeType font driver for PCF fonts |
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2 |
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3 Francesco Zappa Nardelli |
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4 <francesco.zappa.nardelli@ens.fr> |
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5 |
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6 |
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7 Introduction |
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8 ************ |
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9 |
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10 PCF (Portable Compiled Format) is a binary bitmap font format, largely used |
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11 in X world. This code implements a PCF driver for the FreeType library. |
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12 Glyph images are loaded into memory only on demand, thus leading to a small |
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13 memory footprint. |
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14 |
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15 Information on the PCF font format can only be worked out from |
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16 `pcfread.c', and `pcfwrite.c', to be found, for instance, in the XFree86 |
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17 (www.xfree86.org) source tree (xc/lib/font/bitmap/). |
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18 |
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19 Many good bitmap fonts in bdf format come with XFree86: they can be |
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20 compiled into the pcf format using the `bdftopcf' utility. |
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21 |
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22 |
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23 Supported hardware |
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24 ****************** |
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25 |
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26 The driver has been tested on linux/x86 and sunos5.5/sparc. In both |
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27 cases the compiler was gcc. When back in Paris, I will test it also |
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28 on linux/alpha. |
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29 |
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30 |
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31 Encodings |
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32 ********* |
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33 |
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34 Use `FT_Get_BDF_Charset_ID' to access the encoding and registry. |
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35 |
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36 The driver always exports `ft_encoding_none' as face->charmap.encoding. |
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37 FT_Get_Char_Index() behavior is unmodified, that is, it converts the ULong |
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38 value given as argument into the corresponding glyph number. |
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39 |
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40 |
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41 Known problems |
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42 ************** |
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43 |
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44 - dealing explicitly with encodings breaks the uniformity of freetype2 |
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45 api. |
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46 |
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47 - except for encodings properties, client applications have no |
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48 visibility of the PCF_Face object. This means that applications |
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49 cannot directly access font tables and are obliged to trust |
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50 FreeType. |
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51 |
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52 - currently, glyph names and ink_metrics are ignored. |
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53 |
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54 I plan to give full visibility of the PCF_Face object in the next |
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55 release of the driver, thus implementing also glyph names and |
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56 ink_metrics. |
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57 |
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58 - height is defined as (ascent - descent). Is this correct? |
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59 |
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60 - if unable to read size information from the font, PCF_Init_Face |
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61 sets available_size->width and available_size->height to 12. |
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62 |
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63 - too many english grammar errors in the readme file :-( |
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64 |
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65 |
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66 License |
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67 ******* |
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68 |
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69 Copyright (C) 2000 by Francesco Zappa Nardelli |
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70 |
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71 Permission is hereby granted, free of charge, to any person obtaining |
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72 a copy of this software and associated documentation files (the |
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73 "Software"), to deal in the Software without restriction, including |
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74 without limitation the rights to use, copy, modify, merge, publish, |
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75 distribute, sublicense, and/or sell copies of the Software, and to |
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76 permit persons to whom the Software is furnished to do so, subject to |
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77 the following conditions: |
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78 |
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79 The above copyright notice and this permission notice shall be |
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80 included in all copies or substantial portions of the Software. |
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81 |
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82 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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83 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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84 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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85 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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86 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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87 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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88 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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89 |
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90 |
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91 Credits |
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92 ******* |
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93 |
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94 Keith Packard wrote the pcf driver found in XFree86. His work is at |
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95 the same time the specification and the sample implementation of the |
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96 PCF format. Undoubtedly, this driver is inspired from his work. |
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