Add QtPdf to cmake build

Port QtPdf to Qt6:

  * QtPdf,QtPdfWidgets,QtPdfQuick libs
  * QtPdfQuickPlugin, QtPdfPlugin (imageformat) plugins
  * widget and quick examples
  * qtpdf tests

To fit gn cmake integration and new repo layout code is a bit
reshuffled.

Compared to qmke build following features are not ported yet:

  * ios fat libs
  * qtbase 3rdparty static dependencies

WebEngine build can be skipped with setting
QT_FEATURE_qtwebengine_build=OFF

Note this patch needs follow up for 6.2 branch to disable qtpdf
builds by default, since this should not part of qt 6.2 release.

Task-number: QTBUG-95353
Change-Id: I4dd9f3934bdd478fb6d2fa686074a24d91f09953
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 79d04aa9e3e9aa84d7378260519f9e9a6759dc41)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

5 files changed, 416 insertions, 0 deletions

diff --git a/src/pdf/plugins/imageformats/pdf/CMakeLists.txt b/src/pdf/plugins/imageformats/pdf/CMakeLists.txt
new file mode 100644
index 000000000..8a33e590b
--- /dev/null
+++ b/src/pdf/plugins/imageformats/pdf/CMakeLists.txt
@@ -0,0 +1,11 @@
+qt_internal_add_plugin(QPdfPlugin
+    OUTPUT_NAME qpdf
+    TYPE imageformats
+    SOURCES
+        main.cpp
+        qpdfiohandler.cpp qpdfiohandler_p.h
+    LIBRARIES
+        Qt::PdfPrivate
+)
+
+make_install_only(QPdfPlugin)
diff --git a/src/pdf/plugins/imageformats/pdf/main.cpp b/src/pdf/plugins/imageformats/pdf/main.cpp
new file mode 100644
index 000000000..b4d59353c
--- /dev/null
+++ b/src/pdf/plugins/imageformats/pdf/main.cpp
@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtPDF module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpdfiohandler_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QPdfPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID QImageIOHandlerFactoryInterface_iid FILE "pdf.json")
+
+public:
+    Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
+    QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
+};
+
+QImageIOPlugin::Capabilities QPdfPlugin::capabilities(QIODevice *device, const QByteArray &format) const
+{
+    if (format == "pdf")
+        return Capabilities(CanRead);
+    if (!format.isEmpty())
+        return {};
+
+    Capabilities cap;
+    if (device->isReadable() && QPdfIOHandler::canRead(device))
+        cap |= CanRead;
+    return cap;
+}
+
+QImageIOHandler *QPdfPlugin::create(QIODevice *device, const QByteArray &format) const
+{
+    QPdfIOHandler *hand = new QPdfIOHandler();
+    hand->setDevice(device);
+    hand->setFormat(format);
+    return hand;
+}
+
+QT_END_NAMESPACE
+
+#include "main.moc"
diff --git a/src/pdf/plugins/imageformats/pdf/pdf.json b/src/pdf/plugins/imageformats/pdf/pdf.json
new file mode 100644
index 000000000..1f5268ca1
--- /dev/null
+++ b/src/pdf/plugins/imageformats/pdf/pdf.json
@@ -0,0 +1,4 @@
+{
+    "Keys": [ "pdf" ],
+    "MimeTypes": [ "application/pdf" ]
+}
diff --git a/src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp b/src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp
new file mode 100644
index 000000000..4f610935c
--- /dev/null
+++ b/src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp
@@ -0,0 +1,239 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtPDF module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpdfiohandler_p.h"
+#include <QLoggingCategory>
+#include <QPainter>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(qLcPdf, "qt.imageformat.pdf")
+
+QPdfIOHandler::QPdfIOHandler()
+{
+}
+
+bool QPdfIOHandler::canRead() const
+{
+    if (!device())
+        return false;
+    if (m_loaded)
+        return true;
+    if (QPdfIOHandler::canRead(device())) {
+        setFormat("pdf");
+        return true;
+    }
+    return false;
+}
+
+bool QPdfIOHandler::canRead(QIODevice *device)
+{
+    char buf[6];
+    device->peek(buf, 6);
+    return (!qstrncmp(buf, "%PDF-", 5) || Q_UNLIKELY(!qstrncmp(buf, "\012%PDF-", 6)));
+}
+
+int QPdfIOHandler::currentImageNumber() const
+{
+    return m_page;
+}
+
+QRect QPdfIOHandler::currentImageRect() const
+{
+    return QRect(QPoint(0, 0), m_doc.pageSize(m_page).toSize());
+}
+
+int QPdfIOHandler::imageCount() const
+{
+    int ret = 0;
+    if (const_cast<QPdfIOHandler *>(this)->load(device()))
+        ret = m_doc.pageCount();
+    qCDebug(qLcPdf) << "imageCount" << ret;
+    return ret;
+}
+
+bool QPdfIOHandler::read(QImage *image)
+{
+    if (load(device())) {
+        if (m_page >= m_doc.pageCount())
+            return false;
+        if (m_page < 0)
+            m_page = 0;
+        const bool xform = (m_clipRect.isValid() || m_scaledSize.isValid() || m_scaledClipRect.isValid());
+        QSize pageSize = m_doc.pageSize(m_page).toSize();
+        QSize finalSize = pageSize;
+        QRectF bounds;
+        if (xform && !finalSize.isEmpty()) {
+            bounds = QRectF(QPointF(0,0), QSizeF(finalSize));
+            QPoint tr1, tr2;
+            QSizeF sc(1, 1);
+            if (m_clipRect.isValid()) {
+                tr1 = -m_clipRect.topLeft();
+                finalSize = m_clipRect.size();
+            }
+            if (m_scaledSize.isValid()) {
+                sc = QSizeF(qreal(m_scaledSize.width()) / finalSize.width(),
+                            qreal(m_scaledSize.height()) / finalSize.height());
+                finalSize = m_scaledSize;
+                pageSize = m_scaledSize;
+            }
+            if (m_scaledClipRect.isValid()) {
+                tr2 = -m_scaledClipRect.topLeft();
+                finalSize = m_scaledClipRect.size();
+            }
+            QTransform t;
+            t.translate(tr2.x(), tr2.y());
+            t.scale(sc.width(), sc.height());
+            t.translate(tr1.x(), tr1.y());
+            bounds = t.mapRect(bounds);
+        }
+        qCDebug(qLcPdf) << Q_FUNC_INFO << m_page << finalSize;
+        if (image->size() != finalSize || !image->reinterpretAsFormat(QImage::Format_ARGB32_Premultiplied)) {
+            *image = QImage(finalSize, QImage::Format_ARGB32_Premultiplied);
+            if (!finalSize.isEmpty() && image->isNull()) {
+                // avoid QTBUG-68229
+                qWarning("QPdfIOHandler: QImage allocation failed (size %i x %i)", finalSize.width(), finalSize.height());
+                return false;
+            }
+        }
+        if (!finalSize.isEmpty()) {
+            QPdfDocumentRenderOptions options;
+            if (m_scaledClipRect.isValid())
+                options.setScaledClipRect(m_scaledClipRect);
+            options.setScaledSize(pageSize);
+            image->fill(m_backColor.rgba());
+            QPainter p(image);
+            QImage pageImage = m_doc.render(m_page, finalSize, options);
+            p.drawImage(0, 0, pageImage);
+            p.end();
+        }
+        return true;
+    }
+
+    return false;
+}
+
+QVariant QPdfIOHandler::option(ImageOption option) const
+{
+    switch (option) {
+    case ImageFormat:
+        return QImage::Format_ARGB32_Premultiplied;
+    case Size:
+        const_cast<QPdfIOHandler *>(this)->load(device());
+        return m_doc.pageSize(qMax(0, m_page));
+    case ClipRect:
+        return m_clipRect;
+    case ScaledSize:
+        return m_scaledSize;
+    case ScaledClipRect:
+        return m_scaledClipRect;
+    case BackgroundColor:
+        return m_backColor;
+    case Name:
+        return m_doc.metaData(QPdfDocument::Title);
+    default:
+        break;
+    }
+    return QVariant();
+}
+
+void QPdfIOHandler::setOption(ImageOption option, const QVariant & value)
+{
+    switch (option) {
+    case ClipRect:
+        m_clipRect = value.toRect();
+        break;
+    case ScaledSize:
+        m_scaledSize = value.toSize();
+        break;
+    case ScaledClipRect:
+        m_scaledClipRect = value.toRect();
+        break;
+    case BackgroundColor:
+        m_backColor = value.value<QColor>();
+        break;
+    default:
+        break;
+    }
+}
+
+bool QPdfIOHandler::supportsOption(ImageOption option) const
+{
+    switch (option)
+    {
+    case ImageFormat:
+    case Size:
+    case ClipRect:
+    case ScaledSize:
+    case ScaledClipRect:
+    case BackgroundColor:
+    case Name:
+        return true;
+    default:
+        break;
+    }
+    return false;
+}
+
+bool QPdfIOHandler::jumpToImage(int frame)
+{
+    qCDebug(qLcPdf) << Q_FUNC_INFO << frame;
+    if (frame < 0 || frame >= imageCount())
+        return false;
+    m_page = frame;
+    return true;
+}
+
+bool QPdfIOHandler::jumpToNextImage()
+{
+    return jumpToImage(m_page + 1);
+}
+
+bool QPdfIOHandler::load(QIODevice *device)
+{
+    if (m_loaded)
+        return true;
+    if (format().isEmpty())
+        if (!canRead())
+            return false;
+
+    m_doc.load(device);
+    m_loaded = (m_doc.error() == QPdfDocument::DocumentError::NoError);
+
+    return m_loaded;
+}
+
+QT_END_NAMESPACE
diff --git a/src/pdf/plugins/imageformats/pdf/qpdfiohandler_p.h b/src/pdf/plugins/imageformats/pdf/qpdfiohandler_p.h
new file mode 100644
index 000000000..99a91154c
--- /dev/null
+++ b/src/pdf/plugins/imageformats/pdf/qpdfiohandler_p.h
@@ -0,0 +1,88 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtPDF module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPDFIOHANDLER_H
+#define QPDFIOHANDLER_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/qimageiohandler.h>
+#include <QtPdf/QPdfDocument>
+
+QT_BEGIN_NAMESPACE
+
+class QPdfIOHandler : public QImageIOHandler
+{
+public:
+    QPdfIOHandler();
+    bool canRead() const override;
+    static bool canRead(QIODevice *device);
+    int currentImageNumber() const override;
+    QRect currentImageRect() const override;
+    int imageCount() const override;
+    bool read(QImage *image) override;
+    QVariant option(ImageOption option) const override;
+    void setOption(ImageOption option, const QVariant & value) override;
+    bool supportsOption(ImageOption option) const override;
+    bool jumpToImage(int frame) override;
+    bool jumpToNextImage() override;
+
+private:
+    bool load(QIODevice *device);
+
+private:
+    QPdfDocument m_doc;
+    int m_page = -1;
+
+    QRect m_clipRect;
+    QSize m_scaledSize;
+    QRect m_scaledClipRect;
+    QColor m_backColor = Qt::transparent;
+    bool m_loaded = false;
+};
+
+QT_END_NAMESPACE
+
+#endif // QPDFIOHANDLER_H