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Font engines, like FreeType, draw the font's curves (and lines) on a pixellated surface using a process known as font rasterization. [12] Typically font engines and vector graphics engines render Bézier curves by splitting them recursively up to the point where the curve is flat enough to be drawn as a series of linear or circular segments.
A quadratic Bézier curve segment is defined by two end points and one control point. This circle is eight contiguous segments. The squares are end points and the circles are control points. The outlines of the characters (or glyphs) in TrueType fonts are made of straight line segments and quadratic Bézier curves.
TrueType fonts use composite Béziers composed of quadratic Bézier curves (2nd order curves). To describe a typical type design as a computer font to any given accuracy, 3rd order Béziers require less data than 2nd order Béziers; and these in turn require less data than a series of straight lines. This is true even though any one straight ...
The source of the fonts is drawn with cubic Bézier curves, thus the OTF-version (CFF-style) version of the compiled fonts should be preferred over the TTF-version, as TTF requires quadratic Bézier curves which have to be generated by lossy conversion during the compilation from the source files.
First a mask is created, which includes one or more vector primitives or forms, i.e., circles, squares, TrueType fonts, Bézier curves, etc. Then source must be defined, which may be a color, a color gradient, a bitmap or some vector graphics, and from the painted parts of this source a die cut is made with the help of the above defined mask.
The outlines of the characters in TrueType fonts are made of straight line segments and quadratic Bézier curves, rather than the cubic Bézier curves in Type 1 fonts. While the underlying mathematics of TrueType is thus simpler, many type developers prefer to work with cubic curves because they are easier to draw and edit.
The geometry of a single bicubic patch is thus completely defined by a set of 16 control points. These are typically linked up to form a B-spline surface in a similar way as Bézier curves are linked up to form a B-spline curve. Simpler Bézier surfaces are formed from biquadratic patches (m = n = 2), or Bézier triangles.
A bitmap color font for the Amiga OS. Digital bitmap fonts (and the final rendering of vector fonts) may use monochrome or shades of gray.The latter is anti-aliased.When displaying a text, typically an operating system properly represents the "shades of gray" as intermediate colors between the color of the font and that of the background.