Qt.labs.sharedimage: Make plugin optional

This moves the sharedimage types into a new library and is meant to make
them availabe to the QML compiler at some point in the future.

Task-number: QTBUG-90487
Change-Id: If79425a43cb8c1831422631791d35c1f329c7e80
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

9 files changed, 207 insertions, 87 deletions

diff --git a/src/imports/sharedimage/CMakeLists.txt b/src/imports/sharedimage/CMakeLists.txt
index 90020be7ee..70f3abb76e 100644
--- a/src/imports/sharedimage/CMakeLists.txt
+++ b/src/imports/sharedimage/CMakeLists.txt
@@ -9,19 +9,13 @@ qt_internal_add_qml_module(sharedimageplugin
     VERSION "${CMAKE_PROJECT_VERSION}"
     CLASSNAME QtQuickSharedImagePlugin
     SKIP_TYPE_REGISTRATION
-    GENERATE_QMLTYPES
-    INSTALL_QMLTYPES
+    PLUGIN_OPTIONAL
     SOURCES
         plugin.cpp
-        qsharedimageloader.cpp qsharedimageloader_p.h
-        sharedimageprovider.cpp sharedimageprovider.h
     PUBLIC_LIBRARIES
         Qt::Core
-        Qt::CorePrivate
-        Qt::Gui
-        Qt::GuiPrivate
         Qt::Qml
-        Qt::QuickPrivate
+        Qt::LabsSharedImagePrivate
 )
 
 #### Keys ignored in scope 1:.:.:sharedimage.pro:<TRUE>:
diff --git a/src/imports/sharedimage/plugin.cpp b/src/imports/sharedimage/plugin.cpp
index 3245635b2d..dab04efd92 100644
--- a/src/imports/sharedimage/plugin.cpp
+++ b/src/imports/sharedimage/plugin.cpp
@@ -37,10 +37,11 @@
 **
 ****************************************************************************/
 
+#include <QtLabsSharedImage/private/qtlabssharedimageglobal_p.h>
+#include <QtLabsSharedImage/private/qsharedimageprovider_p.h>
+
 #include <qqmlextensionplugin.h>
 #include <qqmlengine.h>
-#include <sharedimageprovider.h>
-
 
 /*!
     \qmlmodule Qt.labs.sharedimage 1
@@ -99,8 +100,6 @@
     The shared image module does not provide any directly usable QML types.
 */
 
-extern void qml_register_types_Qt_labs_sharedimage();
-
 QT_BEGIN_NAMESPACE
 
 class QtQuickSharedImagePlugin : public QQmlEngineExtensionPlugin
diff --git a/src/labs/CMakeLists.txt b/src/labs/CMakeLists.txt
index 2680ae8d11..9a984ccfb9 100644
--- a/src/labs/CMakeLists.txt
+++ b/src/labs/CMakeLists.txt
@@ -12,3 +12,7 @@ endif()
 if(QT_FEATURE_quick_shadereffect AND TARGET Qt::Quick)
     add_subdirectory(wavefrontmesh)
 endif()
+
+if(QT_FEATURE_systemsemaphore AND TARGET Qt::Quick)
+    add_subdirectory(sharedimage)
+endif()
diff --git a/src/labs/sharedimage/CMakeLists.txt b/src/labs/sharedimage/CMakeLists.txt
new file mode 100644
index 0000000000..217f688599
--- /dev/null
+++ b/src/labs/sharedimage/CMakeLists.txt
@@ -0,0 +1,24 @@
+qt_internal_add_module(LabsSharedImage
+  GENERATE_METATYPES
+  SOURCES
+        qsharedimageloader.cpp qsharedimageloader_p.h
+        qsharedimageprovider.cpp qsharedimageprovider_p.h
+        qtlabssharedimageglobal_p.h
+  DEFINES
+        QT_BUILD_LABSSHAREDIMAGE_LIB
+  PUBLIC_LIBRARIES
+        Qt::CorePrivate
+        Qt::GuiPrivate
+        Qt::QuickPrivate
+)
+
+
+set_target_properties(LabsSharedImage PROPERTIES
+    QT_QML_MODULE_INSTALL_QMLTYPES TRUE
+    QT_QML_MODULE_VERSION ${CMAKE_PROJECT_VERSION}
+    QT_QML_MODULE_URI Qt.labs.sharedimage
+    QT_QMLTYPES_FILENAME plugins.qmltypes
+    QT_QML_MODULE_INSTALL_DIR "${INSTALL_QMLDIR}/Qt/labs/sharedimage"
+)
+
+qt6_qml_type_registration(LabsSharedImage)
diff --git a/src/imports/sharedimage/qsharedimageloader.cpp b/src/labs/sharedimage/qsharedimageloader.cpp
index c9e3ef3eb3..c9e3ef3eb3 100644
--- a/src/imports/sharedimage/qsharedimageloader.cpp
+++ b/src/labs/sharedimage/qsharedimageloader.cpp
diff --git a/src/imports/sharedimage/qsharedimageloader_p.h b/src/labs/sharedimage/qsharedimageloader_p.h
index ce10d0d72c..3c6dabc871 100644
--- a/src/imports/sharedimage/qsharedimageloader_p.h
+++ b/src/labs/sharedimage/qsharedimageloader_p.h
@@ -40,6 +40,19 @@
 #ifndef QSHAREDIMAGELOADER_H
 #define QSHAREDIMAGELOADER_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 "qtlabssharedimageglobal_p.h"
+
 #include <QImage>
 #include <QVariant>
 #include <QLoggingCategory>
@@ -51,7 +64,7 @@ Q_DECLARE_LOGGING_CATEGORY(lcSharedImage);
 
 class QSharedImageLoaderPrivate;
 
-class QSharedImageLoader : public QObject
+class Q_LABSSHAREDIMAGE_PRIVATE_EXPORT QSharedImageLoader : public QObject
 {
     Q_OBJECT
     Q_DECLARE_PRIVATE(QSharedImageLoader)
diff --git a/src/imports/sharedimage/sharedimageprovider.cpp b/src/labs/sharedimage/qsharedimageprovider.cpp
index aad6ea3b78..74822a4e87 100644
--- a/src/imports/sharedimage/sharedimageprovider.cpp
+++ b/src/labs/sharedimage/qsharedimageprovider.cpp
@@ -37,8 +37,7 @@
 **
 ****************************************************************************/
 
-#include <sharedimageprovider.h>
-#include <qsharedimageloader_p.h>
+#include <qsharedimageprovider_p.h>
 #include <private/qquickpixmapcache_p.h>
 #include <private/qimage_p.h>
 #include <QImageReader>
@@ -47,80 +46,62 @@
 
 Q_DECLARE_METATYPE(QQuickImageProviderOptions)
 
-class QuickSharedImageLoader : public QSharedImageLoader
+
+QuickSharedImageLoader::QuickSharedImageLoader(QObject *parent) : QSharedImageLoader(parent) {}
+
+QImage QuickSharedImageLoader::loadFile(const QString &path, ImageParameters *params)
 {
-    Q_OBJECT
-    friend class SharedImageProvider;
-
-public:
-    enum ImageParameter {
-        OriginalSize = 0,
-        RequestedSize,
-        ProviderOptions,
-        NumImageParameters
-    };
-
-    QuickSharedImageLoader(QObject *parent = nullptr)
-        : QSharedImageLoader(parent)
-    {
+    QImageReader imgio(path);
+    QSize realSize = imgio.size();
+    QSize requestSize;
+    QQuickImageProviderOptions options;
+    if (params) {
+        requestSize = params->value(RequestedSize).toSize();
+        options = params->value(ProviderOptions).value<QQuickImageProviderOptions>();
     }
 
-protected:
-    QImage loadFile(const QString &path, ImageParameters *params) override
-    {
-        QImageReader imgio(path);
-        QSize realSize = imgio.size();
-        QSize requestSize;
-        QQuickImageProviderOptions options;
-        if (params) {
-            requestSize = params->value(RequestedSize).toSize();
-            options = params->value(ProviderOptions).value<QQuickImageProviderOptions>();
-        }
-
-        QSize scSize = QQuickImageProviderWithOptions::loadSize(imgio.size(), requestSize, imgio.format(), options);
-
-        if (scSize.isValid())
-            imgio.setScaledSize(scSize);
-
-        QImage image;
-        if (imgio.read(&image)) {
-            if (realSize.isEmpty())
-                realSize = image.size();
-            // Make sure we have acceptable format for texture uploader, or it will convert & lose sharing
-            // This mimics the testing & conversion normally done by the quick pixmapcache & texturefactory
-            if (image.format() != QImage::Format_RGB32 && image.format() != QImage::Format_ARGB32_Premultiplied) {
-                QImage::Format newFmt = QImage::Format_RGB32;
-                if (image.hasAlphaChannel() && image.data_ptr()->checkForAlphaPixels())
-                    newFmt = QImage::Format_ARGB32_Premultiplied;
-                qCDebug(lcSharedImage) << "Convert on load from format" << image.format() << "to" << newFmt;
-                image = image.convertToFormat(newFmt);
-            }
+    QSize scSize = QQuickImageProviderWithOptions::loadSize(imgio.size(), requestSize, imgio.format(), options);
+
+    if (scSize.isValid())
+        imgio.setScaledSize(scSize);
+
+    QImage image;
+    if (imgio.read(&image)) {
+        if (realSize.isEmpty())
+            realSize = image.size();
+        // Make sure we have acceptable format for texture uploader, or it will convert & lose sharing
+        // This mimics the testing & conversion normally done by the quick pixmapcache & texturefactory
+        if (image.format() != QImage::Format_RGB32 && image.format() != QImage::Format_ARGB32_Premultiplied) {
+            QImage::Format newFmt = QImage::Format_RGB32;
+            if (image.hasAlphaChannel() && image.data_ptr()->checkForAlphaPixels())
+                newFmt = QImage::Format_ARGB32_Premultiplied;
+            qCDebug(lcSharedImage) << "Convert on load from format" << image.format() << "to" << newFmt;
+            image = image.convertToFormat(newFmt);
         }
-
-        if (params && params->count() > OriginalSize)
-            params->replace(OriginalSize, realSize);
-
-        return image;
     }
 
-    QString key(const QString &path, ImageParameters *params) override
-    {
-        QSize reqSz;
-        QQuickImageProviderOptions opts;
-        if (params) {
-            reqSz = params->value(RequestedSize).toSize();
-            opts = params->value(ProviderOptions).value<QQuickImageProviderOptions>();
-        }
-        if (!reqSz.isValid())
-            return path;
-        int aspect = opts.preserveAspectRatioCrop() || opts.preserveAspectRatioFit() ? 1 : 0;
+    if (params && params->count() > OriginalSize)
+        params->replace(OriginalSize, realSize);
+
+    return image;
+}
 
-        QString key = path + QStringLiteral("_%1x%2_%3").arg(reqSz.width()).arg(reqSz.height()).arg(aspect);
-        qCDebug(lcSharedImage) << "KEY:" << key;
-        return key;
+QString QuickSharedImageLoader::key(const QString &path, ImageParameters *params)
+{
+    QSize reqSz;
+    QQuickImageProviderOptions opts;
+    if (params) {
+        reqSz = params->value(RequestedSize).toSize();
+        opts = params->value(ProviderOptions).value<QQuickImageProviderOptions>();
     }
-};
+    if (!reqSz.isValid())
+        return path;
+    int aspect = opts.preserveAspectRatioCrop() || opts.preserveAspectRatioFit() ? 1 : 0;
 
+    QString key = path + QStringLiteral("_%1x%2_%3").arg(reqSz.width()).arg(reqSz.height()).arg(aspect);
+    qCDebug(lcSharedImage) << "KEY:" << key;
+    return key;
+}
 
 SharedImageProvider::SharedImageProvider()
     : QQuickImageProviderWithOptions(QQuickImageProvider::Image), loader(new QuickSharedImageLoader)
@@ -156,5 +137,3 @@ QImage SharedImageProvider::requestImage(const QString &id, QSize *size, const Q
 
     return img;
 }
-
-#include "sharedimageprovider.moc"
diff --git a/src/imports/sharedimage/sharedimageprovider.h b/src/labs/sharedimage/qsharedimageprovider_p.h
index e6b6c77134..f8bea9e784 100644
--- a/src/imports/sharedimage/sharedimageprovider.h
+++ b/src/labs/sharedimage/qsharedimageprovider_p.h
@@ -37,16 +37,50 @@
 **
 ****************************************************************************/
 
-#ifndef SHAREDIMAGEPROVIDER_H
-#define SHAREDIMAGEPROVIDER_H
+#ifndef QSHAREDIMAGEPROVIDER_H
+#define QSHAREDIMAGEPROVIDER_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 "qtlabssharedimageglobal_p.h"
 
 #include <QQuickImageProvider>
 #include <private/qquickpixmapcache_p.h>
 #include <QScopedPointer>
 
-class QuickSharedImageLoader;
+#include "qsharedimageloader_p.h"
+
+class SharedImageProvider;
+
+class QuickSharedImageLoader : public QSharedImageLoader
+{
+    Q_OBJECT
+    friend class SharedImageProvider;
+
+public:
+    enum ImageParameter {
+        OriginalSize = 0,
+        RequestedSize,
+        ProviderOptions,
+        NumImageParameters
+    };
+
+    QuickSharedImageLoader(QObject *parent = nullptr);
+protected:
+    QImage loadFile(const QString &path, ImageParameters *params) override;
+    QString key(const QString &path, ImageParameters *params) override;
+};
 
-class SharedImageProvider : public QQuickImageProviderWithOptions
+class Q_LABSSHAREDIMAGE_PRIVATE_EXPORT SharedImageProvider : public QQuickImageProviderWithOptions
 {
 public:
     SharedImageProvider();
@@ -56,4 +90,4 @@ public:
 protected:
     QScopedPointer<QuickSharedImageLoader> loader;
 };
-#endif // SHAREDIMAGEPROVIDER_H
+#endif // QSHAREDIMAGEPROVIDER_H
diff --git a/src/labs/sharedimage/qtlabssharedimageglobal_p.h b/src/labs/sharedimage/qtlabssharedimageglobal_p.h
new file mode 100644
index 0000000000..c67be432dd
--- /dev/null
+++ b/src/labs/sharedimage/qtlabssharedimageglobal_p.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTLABSSHAREDIMAGEGLOBAL_P_H
+#define QTLABSSHAREDIMAGEGLOBAL_P_H
+
+#include <QtCore/qglobal.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.
+//
+
+QT_BEGIN_NAMESPACE
+
+#if !defined(QT_STATIC)
+#  if defined(QT_BUILD_LABSSHAREDIMAGE_LIB)
+#    define Q_LABSSHAREDIMAGE_EXPORT Q_DECL_EXPORT
+#  else
+#    define Q_LABSSHAREDIMAGE_EXPORT Q_DECL_IMPORT
+#  endif
+#else
+#  define Q_LABSSHAREDIMAGE_EXPORT
+#endif
+#define Q_LABSSHAREDIMAGE_PRIVATE_EXPORT Q_LABSSHAREDIMAGE_EXPORT
+
+QT_END_NAMESPACE
+
+void Q_LABSSHAREDIMAGE_PRIVATE_EXPORT qml_register_types_Qt_labs_sharedimage();
+
+#endif // QTLABSSHAREDIMAGEGLOBAL_P_H