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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page qt-embedded-fonts.html
\title Qt for Embedded Linux Fonts
\ingroup qt-embedded-linux
Qt normally uses \c{fontconfig} to provide access to system fonts. If
\c{fontconfig} is not available, for example, in dedicated embedded
systems where space is at a premium, Qt will fall back to using
\c QBasicFontDatabase. In this case, Qt applications will look for fonts in
Qt's \c lib/fonts/ directory. Qt will automatically detect prerendered
fonts and TrueType fonts.
Qt uses the
font engine to produce font output. The formats supported depends on
the locally installed version of the FreeType library.
\image qt-embedded-fontfeatures.png
{QConfig tool showing FreeType font engine configuration options}
All supported fonts use the Unicode character encoding. Most fonts
available today do, but they usually don't contain \e all the
Unicode characters. A complete 16-point Unicode font uses over 1
MB of memory.
\target FreeType
\section1 FreeType Formats
library can support the following font formats:
\list
\li TrueType (TTF)
\li PostScript Type1 (PFA/PFB)
\li Bitmap Distribution Format (BDF)
\li CID-keyed Type1
\li Compact Font Format (CFF)
\li OpenType fonts
\li SFNT-based bitmap fonts
\li Portable Compiled Format (PCF)
\li Microsoft Windows Font File Format (Windows FNT)
\li Portable Font Resource (PFR)
\li Type 42 (limited support)
\endlist
It is possible to add modules to the \l
font engine to support other types of font files. For more
information, see the font engine's own website: \l
Glyphs rendered using FreeType are shared efficiently between applications,
reducing memory requirements and speeding up text rendering.
*/