/****************************************************************************
**
** Copyright (C) 2006-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

/*!
    \page qtopiacore-fonts.html

    \title Qtopia Core Fonts
    \ingroup qtopiacore

    \l {Qtopia Core} uses the \l
    {http://freetype.sourceforge.net/freetype2/index.html}{FreeType 2}
    font engine to produce font output. The formats supported depends on
    the locally installed version of the FreeType library. In addition,
    \l {Qtopia Core} supports the Qt Prerendered Font formats (\l QPF and \l QPF2):
    light-weight non-scalable font formats specific to \l {Qtopia Core}. QPF2 is the
    native format of \l {Qtopia Core}. QPF is the legacy format used by Qt/Embedded
    2.x and 3.x. Several of the formats may be rendered using anti-aliasing
    for improved readability.

    When \l {Qtopia Core} applications run, they look for fonts in \l {Qtopia Core}'s
    \c lib/fonts/ directory. \l {Qtopia Core} will automatically detect prerendered
    fonts and TrueType fonts. For compatibility, \l {Qtopia Core} will also read the
    legacy \c lib/fonts/fontdir file.

    Support for other font formats can be added, contact
    \l{mailto:info@trolltech.com}{info@trolltech.com} for more
    information.

    \tableofcontents

    \table 100%
    \row
    \o
    \bold {Optimization}

    The \l FreeType, \l QPF2 and \l QPF formats are features that can be
    disabled using \l {Qtopia Core}'s feature definition system,
    reducing the size of Qt and saving resources.

    Note that at least one font format must be defined.

    See the \l {Fine-Tuning Features in Qtopia Core} documentation for
    details.

    \o
    \inlineimage qtopiacore-fontfeatures.png
    \endtable

    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

    The \l {http://freetype.sourceforge.net/freetype2/index.html}{FreeType 2}
    library (and therefore \l {Qtopia Core}) can support the following font formats:

    \list
        \o TrueType (TTF)
        \o PostScript Type1 (PFA/PFB)
        \o Bitmap Distribution Format (BDF)
        \o CID-keyed Type1
        \o Compact Font Format (CFF)
        \o OpenType fonts
        \o SFNT-based bitmap fonts
        \o Portable Compiled Format (PCF)
        \o Microsoft Windows Font File Format (Windows FNT)
        \o Portable Font Resource (PFR)
        \o Type 42 (limited support)
    \endlist

    It is possible to add modules to the \l
    {http://freetype.sourceforge.net/freetype2/index.html}{FreeType 2}
    font engine to support other types of font files. For more
    information, see the font engine's own website: \l
    http://freetype.sourceforge.net/freetype2/index.html.

    Glyphs rendered using FreeType are shared efficiently between applications,
    reducing memory requirements and speeding up text rendering.

    \omit
    \l {Qtopia Core} will by default use the system FreeType library if it exists.
    Otherwise it will use a copy of the FreeType library in Qt, which by default only
    supports TrueType fonts to reduce footprint.
    \endomit

    \target QPF2
    \section1 Qt Prerendered Font (QPF2)

    The Qt Prerendered Font (QPF2) is an architecture-independent,
    light-weight and non-scalable font format specific to \l {Qtopia Core}.

    Trolltech provides the cross-platform \c makeqpf tool, included in the
    \c tools directory of both \l {Qt} and \l {Qtopia Core}, which allows
    generation of QPF2 files from system fonts.

    QPF2 supports anti-aliasing and complex writing systems, using information
    from the corresponding TrueType font, if present on the system. The format
    is designed to be mapped directly to memory. The same format is used to
    share glyphs from non-prerendered fonts between applications.

    \target QPF
    \section1 Legacy Qt Prerendered Font (QPF)

    Trolltech provides support for the legacy QPF format for compatibility
    reasons. QPF is based on the internal font engine data structure of Qt/Embedded
    (\l {Qtopia Core}'s predecessor) versions 2 and 3.

    Note that the file name describes the font, for example \c helvetica_120_50.qpf
    is 12 point Helvetica while \c helvetica_120_50i.qpf is 12 point Helvetica \e italic.

\omit
    \section1 Memory Requirements

    Taking advantage of the way the QPF format is structured, Qtopia
    Core memory-maps the data rather than reading and parsing it. This
    reduces RAM consumption even further.

    Scalable fonts use a larger amount of memory per font, but
    these fonts provide a memory saving if many different sizes of each
    font are needed.
\endomit

    \section1 The Legacy \c fontdir File

    For compatibility reasons \l {Qtopia Core} supports the \c fontdir
    file, if present. The file defines additional fonts available to the
    application, and has the following format:

    \code
        name file renderer italic weight size flags
    \endcode

    \table 100%
    \header \o Field \o Description
    \row \o \bold name
    \o The name of the font format, e.g.,\c Helvetica, \c Times, etc.
    \row \o \bold file
    \o The name of the file containing the font, e.g., \c
    helvR0810.bdf, \c verdana.ttf, etc.
    \row \o \bold renderer
    \o Specifies the font engine that should be used to render the
    font, currently only the FreeType font engine (\c FT) is
    supported.
    \row \o \bold italic
    \o Specifies whether the font is italic or not; the accepted
    values are \c y or \c n.
    \row \o \bold weight
    \o Specifies the font's weight: \c 50 is normal, \c 75 is bold,
    etc.
    \row \o \bold size
    \o Specifies the font size, i.e., point size * 10. For example, a
    value of 120 means 12pt. A value of 0 means that the font is
    scalable.
    \row \o \bold flags
    \o The following flag is supported:
    \list
        \o \c s: smooth (anti-aliased)
    \endlist
    All other flags are ignored.
    \endtable
*/
