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TrueDoc in Embedded Devices
Bitstream TrueDoc provides a compact, high-performance
font rasterizer that is ideal for limited memory
applications. The same compact data format is used for both
embedded and downloaded fonts, so one engine provides both capabilities.
Embedded fonts and downloaded font fragments can be combined
dynamically.
TrueDoc can be fully implemented into an embedded system
using only approximately 100K of memory. This includes support
for color anti-aliasing, sub-pixel positioning, digital edge
filtering plus special effects such as drop shadow, mirror,
flip, and rotation. An optional path graphics
module is also available.
Fonts are stored by TrueDoc in a Portable Font Resource (PFR)
formatted file. The PFR files are only slightly bigger than
a single 24 line monochrome bitmap of the same font. Because
TrueDoc fonts are fully scaleable, they can supply all required
character sizes at any resolution, which is a real plus if
multiple output resolutions such as screen and printer must
be considered. When memory is a primary concern, TrueDoc's
built-in psuedo-bold and psuedo-italic capability can be used
to reduce the number of fonts required to be stored in memory.
TrueDoc is fully double-byte enabled and works with all world
languages, delivering an ideal solution for embedded Asian
languages. A complete system including the TrueDoc core plus
level 1 and level 2 GB Chinese can be implemented in under
one megabyte of memory.
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