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5.15.1: original qtextimagehandler.cpp
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kleuter
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5.15.1/qtbase/src/gui/text/qtextimagehandler.cpp
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268
5.15.1/qtbase/src/gui/text/qtextimagehandler.cpp
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qtextimagehandler_p.h"
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#include <qguiapplication.h>
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#include <qtextformat.h>
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#include <qpainter.h>
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#include <qdebug.h>
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#include <qfile.h>
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#include <private/qtextengine_p.h>
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#include <qpalette.h>
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#include <qthread.h>
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QT_BEGIN_NAMESPACE
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extern QString qt_findAtNxFile(const QString &baseFileName, qreal targetDevicePixelRatio,
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qreal *sourceDevicePixelRatio);
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static QString resolveFileName(QString fileName, QUrl *url, qreal targetDevicePixelRatio,
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qreal *sourceDevicePixelRatio)
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{
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// We might use the fileName for loading if url loading fails
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// try to make sure it is a valid file path.
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// Also, QFile{Info}::exists works only on filepaths (not urls)
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if (url->isValid()) {
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if (url->scheme() == QLatin1String("qrc")) {
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fileName = fileName.right(fileName.length() - 3);
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}
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else if (url->scheme() == QLatin1String("file")) {
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fileName = url->toLocalFile();
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}
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}
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if (targetDevicePixelRatio <= 1.0)
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return fileName;
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// try to find a Nx version
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return qt_findAtNxFile(fileName, targetDevicePixelRatio, sourceDevicePixelRatio);
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}
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static QPixmap getPixmap(QTextDocument *doc, const QTextImageFormat &format, const qreal devicePixelRatio = 1.0)
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{
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QPixmap pm;
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QString name = format.name();
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if (name.startsWith(QLatin1String(":/"))) // auto-detect resources and convert them to url
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name.prepend(QLatin1String("qrc"));
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QUrl url = QUrl(name);
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qreal sourcePixelRatio = 1.0;
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name = resolveFileName(name, &url, devicePixelRatio, &sourcePixelRatio);
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const QVariant data = doc->resource(QTextDocument::ImageResource, url);
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if (data.userType() == QMetaType::QPixmap || data.userType() == QMetaType::QImage) {
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pm = qvariant_cast<QPixmap>(data);
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} else if (data.userType() == QMetaType::QByteArray) {
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pm.loadFromData(data.toByteArray());
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}
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if (pm.isNull()) {
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#if 0
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QString context;
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// ### Qt5
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QTextBrowser *browser = qobject_cast<QTextBrowser *>(doc->parent());
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if (browser)
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context = browser->source().toString();
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#endif
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// try direct loading
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QImage img;
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if (name.isEmpty() || !img.load(name))
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return QPixmap(QLatin1String(":/qt-project.org/styles/commonstyle/images/file-16.png"));
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pm = QPixmap::fromImage(img);
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doc->addResource(QTextDocument::ImageResource, url, pm);
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}
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if (name.contains(QLatin1String("@2x")))
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pm.setDevicePixelRatio(sourcePixelRatio);
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return pm;
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}
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static QSize getPixmapSize(QTextDocument *doc, const QTextImageFormat &format)
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{
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QPixmap pm;
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const bool hasWidth = format.hasProperty(QTextFormat::ImageWidth);
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const int width = qRound(format.width());
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const bool hasHeight = format.hasProperty(QTextFormat::ImageHeight);
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const int height = qRound(format.height());
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QSize size(width, height);
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if (!hasWidth || !hasHeight) {
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pm = getPixmap(doc, format);
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const int pmWidth = pm.width() / pm.devicePixelRatio();
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const int pmHeight = pm.height() / pm.devicePixelRatio();
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if (!hasWidth) {
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if (!hasHeight)
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size.setWidth(pmWidth);
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else
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size.setWidth(qRound(height * (pmWidth / (qreal) pmHeight)));
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}
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if (!hasHeight) {
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if (!hasWidth)
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size.setHeight(pmHeight);
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else
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size.setHeight(qRound(width * (pmHeight / (qreal) pmWidth)));
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}
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}
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qreal scale = 1.0;
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QPaintDevice *pdev = doc->documentLayout()->paintDevice();
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if (pdev) {
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if (pm.isNull())
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pm = getPixmap(doc, format);
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if (!pm.isNull())
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scale = qreal(pdev->logicalDpiY()) / qreal(qt_defaultDpi());
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}
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size *= scale;
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return size;
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}
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static QImage getImage(QTextDocument *doc, const QTextImageFormat &format, const qreal devicePixelRatio = 1.0)
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{
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QImage image;
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QString name = format.name();
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if (name.startsWith(QLatin1String(":/"))) // auto-detect resources
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name.prepend(QLatin1String("qrc"));
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QUrl url = QUrl(name);
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qreal sourcePixelRatio = 1.0;
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name = resolveFileName(name, &url, devicePixelRatio, &sourcePixelRatio);
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const QVariant data = doc->resource(QTextDocument::ImageResource, url);
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if (data.userType() == QMetaType::QImage) {
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image = qvariant_cast<QImage>(data);
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} else if (data.userType() == QMetaType::QByteArray) {
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image.loadFromData(data.toByteArray());
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}
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if (image.isNull()) {
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#if 0
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QString context;
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// ### Qt5
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QTextBrowser *browser = qobject_cast<QTextBrowser *>(doc->parent());
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if (browser)
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context = browser->source().toString();
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#endif
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// try direct loading
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if (name.isEmpty() || !image.load(name))
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return QImage(QLatin1String(":/qt-project.org/styles/commonstyle/images/file-16.png"));
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doc->addResource(QTextDocument::ImageResource, url, image);
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}
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if (sourcePixelRatio != 1.0)
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image.setDevicePixelRatio(sourcePixelRatio);
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return image;
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}
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static QSize getImageSize(QTextDocument *doc, const QTextImageFormat &format)
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{
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QImage image;
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const bool hasWidth = format.hasProperty(QTextFormat::ImageWidth);
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const int width = qRound(format.width());
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const bool hasHeight = format.hasProperty(QTextFormat::ImageHeight);
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const int height = qRound(format.height());
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QSize size(width, height);
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if (!hasWidth || !hasHeight) {
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image = getImage(doc, format);
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if (!hasWidth)
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size.setWidth(image.width() / image.devicePixelRatio());
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if (!hasHeight)
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size.setHeight(image.height() / image.devicePixelRatio());
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}
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qreal scale = 1.0;
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QPaintDevice *pdev = doc->documentLayout()->paintDevice();
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if (pdev) {
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if (image.isNull())
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image = getImage(doc, format);
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if (!image.isNull())
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scale = qreal(pdev->logicalDpiY()) / qreal(qt_defaultDpi());
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}
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size *= scale;
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return size;
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}
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QTextImageHandler::QTextImageHandler(QObject *parent)
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: QObject(parent)
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{
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}
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QSizeF QTextImageHandler::intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format)
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{
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Q_UNUSED(posInDocument)
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const QTextImageFormat imageFormat = format.toImageFormat();
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if (QCoreApplication::instance()->thread() != QThread::currentThread())
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return getImageSize(doc, imageFormat);
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return getPixmapSize(doc, imageFormat);
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}
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QImage QTextImageHandler::image(QTextDocument *doc, const QTextImageFormat &imageFormat)
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{
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Q_ASSERT(doc != nullptr);
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return getImage(doc, imageFormat);
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}
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void QTextImageHandler::drawObject(QPainter *p, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format)
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{
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Q_UNUSED(posInDocument)
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const QTextImageFormat imageFormat = format.toImageFormat();
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if (QCoreApplication::instance()->thread() != QThread::currentThread()) {
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const QImage image = getImage(doc, imageFormat, p->device()->devicePixelRatioF());
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p->drawImage(rect, image, image.rect());
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} else {
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const QPixmap pixmap = getPixmap(doc, imageFormat, p->device()->devicePixelRatioF());
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p->drawPixmap(rect, pixmap, pixmap.rect());
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}
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}
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QT_END_NAMESPACE
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