| Frame Buffer Library |
| ==================== |
| |
| The frame buffer drivers depend heavily on four data structures. These |
| structures are declared in include/linux/fb.h. They are fb_info, |
| fb_var_screeninfo, fb_fix_screeninfo and fb_monospecs. The last |
| three can be made available to and from userland. |
| |
| fb_info defines the current state of a particular video card. Inside |
| fb_info, there exists a fb_ops structure which is a collection of |
| needed functions to make fbdev and fbcon work. fb_info is only visible |
| to the kernel. |
| |
| fb_var_screeninfo is used to describe the features of a video card |
| that are user defined. With fb_var_screeninfo, things such as depth |
| and the resolution may be defined. |
| |
| The next structure is fb_fix_screeninfo. This defines the properties |
| of a card that are created when a mode is set and can't be changed |
| otherwise. A good example of this is the start of the frame buffer |
| memory. This "locks" the address of the frame buffer memory, so that it |
| cannot be changed or moved. |
| |
| The last structure is fb_monospecs. In the old API, there was little |
| importance for fb_monospecs. This allowed for forbidden things such as |
| setting a mode of 800x600 on a fix frequency monitor. With the new API, |
| fb_monospecs prevents such things, and if used correctly, can prevent a |
| monitor from being cooked. fb_monospecs will not be useful until |
| kernels 2.5.x. |
| |
| Frame Buffer Memory |
| ------------------- |
| |
| .. kernel-doc:: drivers/video/fbdev/core/fbmem.c |
| :export: |
| |
| Frame Buffer Colormap |
| --------------------- |
| |
| .. kernel-doc:: drivers/video/fbdev/core/fbcmap.c |
| :export: |
| |
| Frame Buffer Video Mode Database |
| -------------------------------- |
| |
| .. kernel-doc:: drivers/video/fbdev/core/modedb.c |
| :internal: |
| |
| .. kernel-doc:: drivers/video/fbdev/core/modedb.c |
| :export: |
| |
| Frame Buffer Macintosh Video Mode Database |
| ------------------------------------------ |
| |
| .. kernel-doc:: drivers/video/fbdev/macmodes.c |
| :export: |
| |
| Frame Buffer Fonts |
| ------------------ |
| |
| Refer to the file lib/fonts/fonts.c for more information. |
| |