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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgdistancefieldutil_p.h"
#include <private/qsgadaptationlayer_p.h>
#include <QtGui/private/qopenglengineshadersource_p.h>
#include <QtQuick/private/qsgcontext_p.h>
QT_BEGIN_NAMESPACE
static float defaultThresholdFunc(float glyphScale)
{
static float base = qgetenv("QT_DF_BASE").isEmpty() ? 0.5f : qgetenv("QT_DF_BASE").toFloat();
static float baseDev = qgetenv("QT_DF_BASEDEVIATION").isEmpty() ? 0.065f : qgetenv("QT_DF_BASEDEVIATION").toFloat();
static float devScaleMin = qgetenv("QT_DF_SCALEFORMAXDEV").isEmpty() ? 0.15f : qgetenv("QT_DF_SCALEFORMAXDEV").toFloat();
static float devScaleMax = qgetenv("QT_DF_SCALEFORNODEV").isEmpty() ? 0.3f : qgetenv("QT_DF_SCALEFORNODEV").toFloat();
return base - ((qBound(devScaleMin, glyphScale, devScaleMax) - devScaleMin) / (devScaleMax - devScaleMin) * -baseDev + baseDev);
}
static float defaultAntialiasingSpreadFunc(float glyphScale)
{
static float range = qgetenv("QT_DF_RANGE").isEmpty() ? 0.06f : qgetenv("QT_DF_RANGE").toFloat();
return range / glyphScale;
}
QSGDistanceFieldGlyphCacheManager::QSGDistanceFieldGlyphCacheManager()
: m_threshold_func(defaultThresholdFunc)
, m_antialiasingSpread_func(defaultAntialiasingSpreadFunc)
{
}
QSGDistanceFieldGlyphCacheManager::~QSGDistanceFieldGlyphCacheManager()
{
qDeleteAll(m_caches.values());
}
QSGDistanceFieldGlyphCache *QSGDistanceFieldGlyphCacheManager::cache(const QRawFont &font)
{
return m_caches.value(fontKey(font), 0);
}
void QSGDistanceFieldGlyphCacheManager::insertCache(const QRawFont &font, QSGDistanceFieldGlyphCache *cache)
{
m_caches.insert(fontKey(font), cache);
}
QString QSGDistanceFieldGlyphCacheManager::fontKey(const QRawFont &font)
{
QFontEngine *fe = QRawFontPrivate::get(font)->fontEngine;
if (!fe->faceId().filename.isEmpty()) {
QByteArray keyName = fe->faceId().filename;
if (font.style() != QFont::StyleNormal)
keyName += QByteArray(" I");
if (font.weight() != QFont::Normal)
keyName += ' ' + QByteArray::number(font.weight());
keyName += QByteArray(" DF");
return QString::fromUtf8(keyName);
} else {
return QString::fromLatin1("%1_%2_%3_%4")
.arg(font.familyName())
.arg(font.styleName())
.arg(font.weight())
.arg(font.style());
}
}
QT_END_NAMESPACE
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