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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qfonticonengine_p.h"
#ifndef QT_NO_ICON
#include <QtCore/qdebug.h>
#include <QtCore/qfile.h>
#include <QtCore/qset.h>
#include <QtGui/qfontdatabase.h>
#include <QtGui/qpainter.h>
#include <QtGui/qpainterpath.h>
#include <QtGui/qpalette.h>
#include <QtGui/qtextlayout.h>
#include <QtGui/private/qfont_p.h>
#include <QtGui/private/qfontengine_p.h>
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
QFontIconEngine::QFontIconEngine(const QString &iconName, const QFont &font)
: m_iconName(iconName)
, m_iconFont(font)
{
Q_ASSERT_X(font.styleStrategy() & QFont::NoFontMerging, "QFontIconEngine",
"Icon fonts must not use font merging");
}
QFontIconEngine::~QFontIconEngine() = default;
QIconEngine *QFontIconEngine::clone() const
{
return new QFontIconEngine(m_iconName, m_iconFont);
}
QString QFontIconEngine::key() const
{
return u"QFontIconEngine("_s + m_iconFont.key() + u')';
}
QString QFontIconEngine::iconName()
{
return m_iconName;
}
bool QFontIconEngine::isNull()
{
const QString text = string();
if (!text.isEmpty()) {
const QChar c0 = text.at(0);
const QFontMetrics fontMetrics(m_iconFont);
if (c0.isHighSurrogate() && text.size() > 1)
return !fontMetrics.inFontUcs4(QChar::surrogateToUcs4(c0, text.at(1)));
return !fontMetrics.inFont(c0);
}
return glyph() == 0;
}
QList<QSize> QFontIconEngine::availableSizes(QIcon::Mode, QIcon::State)
{
return {{16, 16}, {24, 24}, {48, 48}, {128, 128}};
}
QSize QFontIconEngine::actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state)
{
if (isNull())
return QIconEngine::actualSize(size, mode, state);
QFont renderFont(m_iconFont);
renderFont.setPixelSize(size.height());
QSizeF result;
if (const glyph_t glyphIndex = glyph()) {
QFontEngine *engine = QFontPrivate::get(renderFont)->engineForScript(QChar::Script_Common);
const glyph_metrics_t gm = engine->boundingBox(glyphIndex);
const qreal glyph_x = gm.x.toReal();
const qreal glyph_y = gm.y.toReal();
const qreal glyph_width = (gm.x + gm.width).toReal() - glyph_x;
const qreal glyph_height = (gm.y + gm.height).toReal() - glyph_y;
if (glyph_width > .0 && glyph_height > .0)
result = {glyph_width, glyph_height};
} else if (const QString text = string(); !text.isEmpty()) {
const QFontMetricsF fm(renderFont);
result = {fm.horizontalAdvance(text), fm.tightBoundingRect(text).height()};
}
if (!result.isValid())
return QIconEngine::actualSize(size, mode, state);
return result.scaled(size, Qt::KeepAspectRatio).toSize();
}
QPixmap QFontIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
{
return scaledPixmap(size, mode, state, 1.0);
}
QPixmap QFontIconEngine::scaledPixmap(const QSize &size, QIcon::Mode mode, QIcon::State state, qreal scale)
{
const quint64 cacheKey = calculateCacheKey(mode, state);
const QSize fittingSize = actualSize(size, mode, state);
if (cacheKey != m_pixmapCacheKey || m_pixmap.deviceIndependentSize() != fittingSize
|| m_pixmap.devicePixelRatio() != scale) {
m_pixmap = QPixmap(fittingSize * scale);
m_pixmap.fill(Qt::transparent);
m_pixmap.setDevicePixelRatio(scale);
if (!m_pixmap.isNull()) {
QPainter painter(&m_pixmap);
paint(&painter, QRect(QPoint(), fittingSize), mode, state);
}
m_pixmapCacheKey = cacheKey;
}
return m_pixmap;
}
void QFontIconEngine::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state)
{
Q_UNUSED(state);
painter->save();
QFont renderFont(m_iconFont);
renderFont.setPixelSize(rect.height());
QColor color = Qt::black;
QPalette palette;
switch (mode) {
case QIcon::Active:
color = palette.color(QPalette::Active, QPalette::Text);
break;
case QIcon::Normal:
color = palette.color(QPalette::Active, QPalette::Text);
break;
case QIcon::Disabled:
color = palette.color(QPalette::Disabled, QPalette::Text);
break;
case QIcon::Selected:
color = palette.color(QPalette::Active, QPalette::HighlightedText);
break;
}
if (glyph_t glyphIndex = glyph()) {
QFontEngine *engine = QFontPrivate::get(renderFont)->engineForScript(QChar::Script_Common);
const glyph_metrics_t gm = engine->boundingBox(glyphIndex);
const int glyph_x = qFloor(gm.x.toReal());
const int glyph_y = qFloor(gm.y.toReal());
const int glyph_width = qCeil((gm.x + gm.width).toReal()) - glyph_x;
const int glyph_height = qCeil((gm.y + gm.height).toReal()) - glyph_y;
if (glyph_width > 0 && glyph_height > 0) {
QFixedPoint pt(QFixed(-glyph_x), QFixed(-glyph_y));
QPainterPath path;
path.setFillRule(Qt::WindingFill);
engine->addGlyphsToPath(&glyphIndex, &pt, 1, &path, {});
// make the glyph fit tightly into rect
const QRectF pathBoundingRect = path.boundingRect();
// center the glyph inside the rect
const QPointF topLeft = rect.topLeft() - pathBoundingRect.topLeft()
+ (QPointF(rect.width(), rect.height())
- QPointF(pathBoundingRect.width(), pathBoundingRect.height())) / 2;
painter->translate(topLeft);
painter->setRenderHint(QPainter::Antialiasing);
painter->setPen(Qt::NoPen);
painter->setBrush(color);
painter->drawPath(path);
}
} else if (const QString text = string(); !text.isEmpty()) {
painter->setFont(renderFont);
painter->setPen(color);
painter->drawText(rect, Qt::AlignCenter, text);
}
painter->restore();
}
QString QFontIconEngine::string() const
{
return {};
}
glyph_t QFontIconEngine::glyph() const
{
if (m_glyph == uninitializedGlyph) {
QFontEngine *engine = QFontPrivate::get(m_iconFont)->engineForScript(QChar::Script_Common);
if (engine)
m_glyph = engine->findGlyph(QLatin1StringView(m_iconName.toLatin1()));
if (!m_glyph) {
// May not be a named glyph, but there might be a ligature for the
// icon name.
QTextLayout layout(m_iconName, m_iconFont);
layout.beginLayout();
layout.createLine();
layout.endLayout();
const auto glyphRuns = layout.glyphRuns();
if (glyphRuns.size() == 1) {
const auto glyphIndexes = glyphRuns.first().glyphIndexes();
if (glyphIndexes.size() == 1)
m_glyph = glyphIndexes.first();
}
}
}
return m_glyph;
}
QT_END_NAMESPACE
#endif // QT_NO_ICON
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