Commit | Line | Data |
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dcec3c8c JC |
1 | Frame Buffer Library |
2 | ==================== | |
3 | ||
4 | The frame buffer drivers depend heavily on four data structures. These | |
5 | structures are declared in include/linux/fb.h. They are fb_info, | |
6 | fb_var_screeninfo, fb_fix_screeninfo and fb_monospecs. The last | |
7 | three can be made available to and from userland. | |
8 | ||
9 | fb_info defines the current state of a particular video card. Inside | |
10 | fb_info, there exists a fb_ops structure which is a collection of | |
11 | needed functions to make fbdev and fbcon work. fb_info is only visible | |
12 | to the kernel. | |
13 | ||
14 | fb_var_screeninfo is used to describe the features of a video card | |
15 | that are user defined. With fb_var_screeninfo, things such as depth | |
16 | and the resolution may be defined. | |
17 | ||
18 | The next structure is fb_fix_screeninfo. This defines the properties | |
19 | of a card that are created when a mode is set and can't be changed | |
20 | otherwise. A good example of this is the start of the frame buffer | |
21 | memory. This "locks" the address of the frame buffer memory, so that it | |
22 | cannot be changed or moved. | |
23 | ||
24 | The last structure is fb_monospecs. In the old API, there was little | |
25 | importance for fb_monospecs. This allowed for forbidden things such as | |
26 | setting a mode of 800x600 on a fix frequency monitor. With the new API, | |
27 | fb_monospecs prevents such things, and if used correctly, can prevent a | |
28 | monitor from being cooked. fb_monospecs will not be useful until | |
29 | kernels 2.5.x. | |
30 | ||
31 | Frame Buffer Memory | |
32 | ------------------- | |
33 | ||
34 | .. kernel-doc:: drivers/video/fbdev/core/fbmem.c | |
35 | :export: | |
36 | ||
37 | Frame Buffer Colormap | |
38 | --------------------- | |
39 | ||
40 | .. kernel-doc:: drivers/video/fbdev/core/fbcmap.c | |
41 | :export: | |
42 | ||
43 | Frame Buffer Video Mode Database | |
44 | -------------------------------- | |
45 | ||
46 | .. kernel-doc:: drivers/video/fbdev/core/modedb.c | |
47 | :internal: | |
48 | ||
49 | .. kernel-doc:: drivers/video/fbdev/core/modedb.c | |
50 | :export: | |
51 | ||
52 | Frame Buffer Macintosh Video Mode Database | |
53 | ------------------------------------------ | |
54 | ||
55 | .. kernel-doc:: drivers/video/fbdev/macmodes.c | |
56 | :export: | |
57 | ||
58 | Frame Buffer Fonts | |
59 | ------------------ | |
60 | ||
61 | Refer to the file lib/fonts/fonts.c for more information. | |
62 |