Framebuffer Abstraction

Framebuffer abstraction. More...

Collaboration diagram for Framebuffer Abstraction:

Detailed Description

Framebuffer abstraction.

Framebuffer devices are exposed as a /dev/fb/[id]/ directory, containing the below files.

name

A read-only file that contains the driver defined name of the framebuffer device.

info

A read-only file that contains information about the framebuffer in the format

[width] [height] [pitch] [format]

where width and height are the integer dimensions of the framebuffer in pixels, pitch is the integer number of bytes per row, and format is the pixel format presented as a series of letter number pairs in little-endian order (starting from the lowest memory address).

For example, 1920 1080 7680 B8G8R8A8 represents a 1920x1080 framebuffer with a pitch of 7680 bytes in 32-bit ARGB format.

data

A readable, writable and mappable file that represents the actual framebuffer memory. Writing to this file updates the pixels on the screen and reading from it retrieves the current pixel data.

Data Structures
struct	fb_info_t
	Framebuffer information. More...
struct	fb_ops_t
	Framebuffer operations. More...
struct	fb_t
	Framebuffer structure. More...

Functions
fb_t *	fb_new (const char *name, const fb_ops_t *ops, void *data)
	Allocate and initialize a new framebuffer.
void	fb_free (fb_t *fb)
	Frees a framebuffer.

Function Documentation

fb_new()

fb_t * fb_new	(	const char *	name,
		const fb_ops_t *	ops,
		void *	data
	)

Allocate and initialize a new framebuffer.

Parameters

name	The driver specified name of the framebuffer.
ops	The operations for the framebuffer.
private	Private data for the framebuffer.

Returns

On success, the new framebuffer. On failure, NULL and errno is set.

Definition at line 134 of file fb.c.

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fb_free()

void fb_free

(

fb_t *

fb

)

Frees a framebuffer.

Parameters

fb	The framebuffer to free.

Definition at line 214 of file fb.c.

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