Acoustic B410 Specifications download pdf (Page 53)

43984801TX Rev.3

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Oki Data CONFIDENTIAL

7. FONTS

7.1 Fonts (PCL)

Fonts are divided broadly into two types, bitmap and scalable (outline) fonts.

7.1.1 Bitmap Fonts

(1) Bitmap fonts are numeric data that is converted as bitmap patterns directly from character

images.

(2) Portrait fonts can be rotated in increments of 90 degrees, or equivalently, printed in por-

trait, landscape, reverse portrait and reverse landscape orientations in one character pat-

tern.

7.1.2 Scalable Fonts

Scalable fonts (outline fonts) are numeric data that is converted from the coordinates of the

edges of character images according to speciﬁc mathematical rules.

An exclusive rasterizer is used to make bitmap patterns of the edges to generate and print the

character images.

There are several types of such mathematical rules. 2D Bezier, 2D B-Spline, 3D Bezier or any

other rules are used depending on each font type.

Scalable fonts are independently and freely scalable in vertical and horizontal directions, and

can be rotated at any angle, ﬂipped from side to side (to create their mirror images), slanted

and boldfaced.

It takes much time for scalable fonts to be rasterized. Bitmap patterns of characters are there-

fore retained in cache memory.

7.2 Rasterizer

A rasterizer is a module that reads scalable font data to generate bitmap patterns and edge

information based on conditions, such as scaling factors and rotation angles.

B410/B420/B430/B440 printers use UFST4.0 (PCL) from Agfa Monotype Corporation.

7.2.1 Font Caches

Rasterizer-generated bitmap patterns are once stored in cache memory. When used next

time, the elements that are the same characters as those used, and also have the same attri-

butes as those used are copied without being processed with a rasterizer.

Bitmap fonts given modiﬁcations including rotations, as well as scalable fonts, are cached.

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Acoustic B410 Specifications Page 53