Linux framebuffer (fbdev)

最新推荐文章于 2024-07-10 14:43:30 发布

原创最新推荐文章于 2024-07-10 14:43:30 发布 · 1.2k 阅读

3 ·

CC 4.0 BY-SA版权

文章标签：

#Linux #Qt #Apple #performance #IBM

Embedded System－名词专栏收录该内容

16 篇文章

订阅专栏

本文介绍了Linux帧缓冲(fbdev)的概念，它是一种图形硬件独立的抽象层，用于在不依赖特定系统库如SVGALib或X Window系统的重负载情况下显示图形。自2.1.107内核起，Linux内核便支持通用帧缓冲。最初是为了让Linux内核能在没有文本模式显示的系统如Apple Macintosh上模拟文本控制台。后来扩展到IBM PC兼容平台，并因在启动时展示Tux标志而变得流行。更重要的是，它使得在Linux控制台上显示Unicode字符成为可能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

The Linux framebuffer (fbdev ) is a graphic hardware-independent abstraction layer to show graphics on a console without relying on system-specific libraries such as SVGALib or the heavy overhead of the X Window System . Linux kernel has generic framebuffer support since 2.1.107 kernel.

It was originally implemented to allow the Linux kernel to emulate a text console on systems such as the Apple Macintosh that do not have a text-mode display , and was later expanded to Linux's originally-supported IBM PC compatible platform, where it became popular largely for the ability to show the Tux logo on boot up. More significantly, it serves as a way of displaying Unicode characters on the Linux console. Under the non-framebuffer, VGA display of the PC, comprehensive Unicode support was impossible, for VGA console fonts were limited to 512 characters.

Nowadays several Linux programs such as MPlayer , and libraries such as GGI , SDL , GTK+ and Qt Extended can use the framebuffer immediately, avoiding the overhead of an X server . This is particularly popular in embedded systems .

The Linux framebuffer has long suffered from its poor performance, but there is now a library DirectFB which provides a framework for hardware acceleration.