X Logical Font Description Conventions: X Consortium Standard

1. Introduction
......................... 1
2. Requirements and Goals
..................... 1
2.1. Provide Unique and Descripti
ve Fo
nt Names
.............. 1
2.2. Support Multiple Font Vendors and Character Sets
............ 1
2.3. Support Scalable and Polymorphic F
onts    .
.............. 2
2.4. Support Transformations and Subsetting of F
onts     .
........... 2
2.5. Be Independent of X Server and Operating or File System Implementations
.... 2
2.6. Support Arbitrarily Comple
xF
ont Matching and Substitution
........ 2
2.7. Be Extensible
........................ 2
3. X Logical Font Description
.................... 2
3.1. F
ontName  .
........................ 3
3.1.1. FontName Syntax
...................... 3
3.1.2. FontName Field Definitions
................... 4
3.1.2.1. FOUNDR
YF
ield     .
.................... 4
3.1.2.2. FAMILY_NAME Field
................... 4
3.1.2.3. WEIGHT_NAME Field
................... 5
3.1.2.4. SLANT Field
...................... 5
3.1.2.5. SETWIDTH_NAME Field
.................. 5
3.1.2.6. ADD_STYLE_NAME Field
.................. 6
3.1.2.7. PIXEL_SIZE Field
..................... 6
3.1.2.8. POINT_SIZE Field
..................... 6
3.1.2.9. RESOLUTION_X and RESOLUTION_Y Fields
........... 7
3.1.2.10. SP
AC
ING Field
..................... 7
3.1.2.11. AVERAGE_WIDTH Field
.................. 7
3.1.2.12. CHARSET_REGISTR
Ya
nd CHARSET_ENCODING Fields
....... 8
3.1.3. Examples
........................ 9
3.2. Font Properties
....................... 9
3.2.1. FOUNDR
Y. . . . . . . . . . . . . . . . . . . . . . . .
10
3.2.2. FAMILY_N
AME   .
..................... 1
0
3.2.3. WEIGHT_N
AME  .
..................... 1
1
3.2.4. SLANT
......................... 1
1
3.2.5. SETWIDTH_N
AME  .
.................... 1
1
3.2.6. ADD_STYLE_N
AME    .
................... 1
1
3.2.7. PIXEL_SIZE
....................... 1
1
3.2.8. POINT_SIZE
....................... 1
2
3.2.9. RESOLUTION_X
...................... 1
2
3.2.10. RESOLUTION_Y
..................... 1
2
3.2.11. SP
AC
ING   .
....................... 1
2
3.2.12. AVERA
GE_WIDTH     .
................... 1
2
3.2.13. CHARSET_REGISTR
Y.
.................. 1
3
3.2.14. CHARSET_ENCODING
................... 1
3
3.2.15. MIN_SP
AC
E. . . . . . . . . . . . . . . . . . . . . . .
13
3.2.16. NORM_SP
AC
E. . . . . . . . . . . . . . . . . . . . . .
13
3.2.17. MAX_SP
AC
E.
..................... 1
3
3.2.18. END_SP
AC
E. . . . . . . . . . . . . . . . . . . . . . .
13
3.2.19. A
VG
_CAPIT
AL_WIDTH  .
.................. 1
4
i
XL
ogical Font Description Con
ventions                                                             X11,
Release 6.4
3.2.20. A
VG
_LO
WERCASE_WIDTH    .
................ 1
4
3.2.21. Q
UA
D_WIDTH  .
..................... 1
4
3.2.22. FIGURE_WIDTH
..................... 1
5
3.2.23. SUPERSCRIPT_X
..................... 1
5
3.2.24. SUPERSCRIPT_Y
..................... 1
5
3.2.25. SUBSCRIPT_X
...................... 1
5
3.2.26. SUBSCRIPT_Y
...................... 1
6
3.2.27. SUPERSCRIPT_SIZE
.................... 1
6
3.2.28. SUBSCRIPT_SIZE
..................... 1
6
3.2.29. SMALL_CAP_SIZE
.................... 1
6
3.2.30. UNDERLINE_POSITION
.................. 1
7
3.2.31. UNDERLINE_THICKNESS
.................. 1
7
3.2.32. STRIKEOUT_ASCENT
................... 1
7
3.2.33. STRIKEOUT_DESCENT
................... 1
7
3.2.34. IT
ALIC_ANGLE      .
.................... 1
8
3.2.35. CAP_HEIGHT
...................... 1
8
3.2.36. X_HEIGHT
....................... 1
8
3.2.37. RELA
TIVE_SETWIDTH   .
.................. 1
9
3.2.38. RELA
TIVE_WEIGHT  .
................... 1
9
3.2.39. WEIGHT
........................ 2
0
3.2.40. RESOLUTION
...................... 2
0
3.2.41. FONT
......................... 2
1
3.2.42. F
AC
E_N
AME      .
..................... 2
1
3.2.43. FULL_N
AME     .
..................... 2
1
3.2.44. COPYRIGHT
....................... 2
1
3.2.45. NO
TICE     .
....................... 2
1
3.2.46. DESTIN
AT
ION   .
..................... 2
1
3.2.47. FONT_TYPE
....................... 2
2
3.2.48. FONT_VERSION
..................... 2
2
3.2.49. RASTERIZER_N
AME .
................... 2
2
3.2.50. RASTERIZER_VERSION
.................. 2
3
3.2.51. RA
W_ASCENT   .
..................... 2
3
3.2.52. RA
W_DESCENT     .
.................... 2
3
3.2.53. RA
W_* .
........................ 2
3
3.2.54. AXIS_N
AMES    .
..................... 2
3
3.2.55. AXIS_LIMITS
...................... 2
3
3.2.56. AXIS_TYPES
...................... 2
3
3.3. Built-in Font Property Atoms
................... 2
3
4. Matrix T
ransformations    .
.................... 2
4
4.1. Metrics and Font Properties
................... 2
5
5. Scalable F
onts    .
....................... 2
6
6. Polymorphic F
onts  .
...................... 2
7
7. Affected Elements of Xlib and the X Protocol
.............. 2
9
8. BDF Conformance
....................... 2
9
8.1. XLFD Conformance Requirements
................. 3
0
8.2. FONT_ASCENT
,F
ONT_DESCENT
,and DEF
AU
LT
_CHAR     .
....... 3
0
8.2.1. FONT_ASCENT
...................... 3
0
8.2.2. FONT_DESCENT
..................... 3
0
8.2.3. DEF
AU
LT
_CHAR      .
.................... 31