RT Font (Scalable fonts)

Low data volume structure

Differences with TrueType Fonts

Weight adjustment

Using just the data for a single font, the thickness of the line (weight value) can be adjusted.

Borders

A border may be added to the rasterized image of a character to enhance its affinity with the background color (image).
Border widths can also be adjusted. 

Rendering mode selection

For straight lines, you can select “Sharp Mode” for non-grayscale rendering and “Smooth Mode” for grayscale rendering.

Vertical/horizontal arbitrary multiplication (Sharp Mode only)

This ensures the design consistency of characters by maintaining the width balance of horizontal and vertical lines whether a character is displayed wide or narrow.

Other functions

Anti-aliasing (grayscale)

Characters can be represented more smoothly with the use of four- and sixteen-level grayscale display.
Processing is faster with fewer levels.

Rotation

The rasterized image of a character can be rotated in increments of one degree.

Oblique

The upper part of the rasterized image of a character may be slanted in 1 dot increments.

128 × 128 dot example

Cache

High-speed rendering is possible by holding the rendered character (rasterized image) in memory, and calling the character directly from memory (without rasterizing) the next time it is rendered.

Bitmap Font replacement