Figure 11-7. Subpixel hinting on an LCD panel
R G B
R G B
R G B
R G B
R G
R
R G B
161
Chapter 12 12
Keyboard Configuration
12.1 Keyboards and XKB
Keyboard configuration is a more complicated issue than it might at first appear.
There are many different keyboards sold, each with a different number or arrangement
of keys. Each of these keyboard models may be sold in different markets, with
different key caps installed, and users may want their keyboard to operate in specific
ways.
Together, this means that there are thousands of possible keyboard configurations.
The XKB extension tries to simplify this by combining a small number of keyboard
selection parameters to compose a particular configuration. The final configuration
is called a keyboard map.
In addition to keys that type characters or perform actions directly, a keyboard map
almost always includes modifiers??”such as Alt, Ctrl, and Shift??”which change the
operation of the other keys. It may also contain dead keys, which don??™t actually type
anything but cause the following character to be accented, so that pressing ?? by itself
doesn??™t type an apostrophe (unless you type it twice), but pressing ?? then A types ??.
Pages:
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256