xerox Font Format Jan76 free download

File name Font_Format_Jan76.pdf

Inter-Office 1Y1emoranduflI To Cyprians Date January 29) 1976 From Tesler, Merry, Sproull, Lampson, Ingalls location Palo Alto Subject Font Format .Organization PARe XERO)(. This memo explains how we arrived at a font format that is twice as compact as .A L format and is easy to use with l3itI3lt. Backgroufl{} Everybody who ever tried to make the Alto do graphics wondered why there was .no BitBlt, so now there is one, and it is wonderful for moving rectangles around the screen, making gray boxes, and painting. But some of us have been less than delighted with its use for "scan conversion of ll characters. This has been a surprise, because we always thought of BitBlt as a way of making character display easier. The Tnh!enu Scheme Our first idea long ago was to have something like the 8 character wide by 16 character high Tableau of the Smalltalk font editor. a bitmap tiled with the characters of a font. \-Vith ascii 0 placed in the upper left corner, one can easily find the upper-left-origin source rectangle of any character by: source x = fontmaxwidth * (ascii & 7) <-- source