Display controller with accelerated drawing of text strings

摘要

A display controller includes a text engine which stores font information, including image and width information, in a unused portion of the frame buffer. A character string comprising width vectors and indices which point to the characters to be drawn, is passed to the display controller from the driver software. Once the character string is received, the text engine draws the indicated characters by reference to the font information previously stored in the character information memory by the driver, allowing the operating system to continue operations while the text string is being drawn to the viewport of the frame buffer.