Avoid code duplication in QImage{Reader,Writer}

Extract code related to supportedImageFormats() and
supportedMimeTypes() into QImageReaderWriterHelpers
namespace.

Change-Id: If0f56682072859be1b6f07afd7737431325827fc
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/gui/image/qimagereaderwriterhelpers_p.h b/src/gui/image/qimagereaderwriterhelpers_p.h
new file mode 100644
index 0000000000..358ae9be89
--- /dev/null
+++ b/src/gui/image/qimagereaderwriterhelpers_p.h
@@ -0,0 +1,138 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui 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 QIMAGEREADERWRITERHELPERS_P_H
+#define QIMAGEREADERWRITERHELPERS_P_H
+
+#include <QtGui/private/qtguiglobal_p.h>
+#include <qsharedpointer.h>
+#include "qimageiohandler.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
+
+class QFactoryLoader;
+
+namespace QImageReaderWriterHelpers {
+
+enum _qt_BuiltInFormatType {
+#ifndef QT_NO_IMAGEFORMAT_PNG
+    _qt_PngFormat,
+#endif
+#ifndef QT_NO_IMAGEFORMAT_BMP
+    _qt_BmpFormat,
+#endif
+#ifndef QT_NO_IMAGEFORMAT_PPM
+    _qt_PpmFormat,
+    _qt_PgmFormat,
+    _qt_PbmFormat,
+#endif
+#ifndef QT_NO_IMAGEFORMAT_XBM
+    _qt_XbmFormat,
+#endif
+#ifndef QT_NO_IMAGEFORMAT_XPM
+    _qt_XpmFormat,
+#endif
+    _qt_NumFormats,
+    _qt_NoFormat = -1
+};
+
+#if !defined(QT_NO_IMAGEFORMAT_PPM)
+# define MAX_MT_SIZE 20
+#elif !defined(QT_NO_IMAGEFORMAT_XBM) || !defined(QT_NO_IMAGEFORMAT_XPM)
+#  define MAX_MT_SIZE 10
+#else
+#  define MAX_MT_SIZE 4
+#endif
+
+struct _qt_BuiltInFormatStruct
+{
+    char extension[4];
+    char mimeType[MAX_MT_SIZE];
+};
+
+#undef MAX_MT_SIZE
+
+static const _qt_BuiltInFormatStruct _qt_BuiltInFormats[] = {
+#ifndef QT_NO_IMAGEFORMAT_PNG
+    {"png", "png"},
+#endif
+#ifndef QT_NO_IMAGEFORMAT_BMP
+    {"bmp", "bmp"},
+#endif
+#ifndef QT_NO_IMAGEFORMAT_PPM
+    {"ppm", "x-portable-pixmap"},
+    {"pgm", "x-portable-graymap"},
+    {"pbm", "x-portable-bitmap"},
+#endif
+#ifndef QT_NO_IMAGEFORMAT_XBM
+    {"xbm", "x-xbitmap"},
+#endif
+#ifndef QT_NO_IMAGEFORMAT_XPM
+    {"xpm", "x-xpixmap"},
+#endif
+};
+Q_STATIC_ASSERT(_qt_NumFormats == sizeof _qt_BuiltInFormats / sizeof *_qt_BuiltInFormats);
+
+#ifndef QT_NO_IMAGEFORMATPLUGIN
+QSharedPointer<QFactoryLoader> pluginLoader();
+#endif
+
+enum Capability {
+    CanRead,
+    CanWrite
+};
+QList<QByteArray> supportedImageFormats(Capability cap);
+QList<QByteArray> supportedMimeTypes(Capability cap);
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QIMAGEREADERWRITERHELPERS_P_H