An outline font rendering processor with an embedded RISC CPU for high-speed hint processing

摘要

Font rendering requires state-of-the-art hint processing for delicate adjustment to output devices in practical applications. The hint processing is a function which corrects transformed outlines using additional information. A font rendering processor has been developed using a CMOS 0.8 /spl mu/m pg process on a 9.47/spl times/9.24 mm/sup 2/ die. It incorporates the hint processing capability, and thus unburdens a host CPU of the whole font rendering. It comprises a RISC CPU for high-speed hint processing and special hardware units that is based upon a DDA and an edge flag algorithm for outline drawing and filling. A performance evaluation using the fabricated chip has shown about 0.4 ms/char and 1.5 ms/char rendering capability for small size alphabets and Kanjis, respectively. It equals about 7-11 times performance compared to a Sparc Station 2, and from about 22-38 times performance compared to a Sun4/110.