Add API for reading and decoding graphical texture files

Add a framework for reading and decoding stored graphical texture file
formats. Includes decoders for the PKM and KTX formats.

This is basically the same texture file reading that was added to
qtdeclarative for 5.11, but has been refactored to be independent of
the scenegraph and opengl.

Task-number: QTBUG-67026
Change-Id: I87d8117550d8a2112f4f58c03e9ac6b3249cbc5a
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 115 insertions, 0 deletions

diff --git a/src/gui/util/qtexturefiledata_p.h b/src/gui/util/qtexturefiledata_p.h
new file mode 100644
index 0000000000..2df23de33c
--- /dev/null
+++ b/src/gui/util/qtexturefiledata_p.h
@@ -0,0 +1,115 @@
+/****************************************************************************
+**
+** 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 QTEXTUREFILEDATA_P_H
+#define QTEXTUREFILEDATA_P_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/qtguiglobal.h>
+#include <QSharedDataPointer>
+#include <QLoggingCategory>
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcQtGuiTextureIO)
+
+class QTextureFileDataPrivate;
+
+class Q_GUI_EXPORT QTextureFileData
+{
+public:
+    QTextureFileData();
+    QTextureFileData(const QTextureFileData &other);
+    QTextureFileData &operator=(const QTextureFileData &other);
+    ~QTextureFileData();
+
+    bool isNull() const;
+    bool isValid() const;
+
+    void clear();
+
+    QByteArray data() const;
+    void setData(const QByteArray &data);
+
+    int dataOffset(int level = 0) const;
+    void setDataOffset(int offset, int level = 0);
+
+    int dataLength(int level = 0) const;
+    void setDataLength(int length, int level = 0);
+
+    int numLevels() const;
+    void setNumLevels(int num);
+
+    QSize size() const;
+    void setSize(const QSize &size);
+
+    quint32 glFormat() const;
+    void setGLFormat(quint32 format);
+
+    quint32 glInternalFormat() const;
+    void setGLInternalFormat(quint32 format);
+
+    quint32 glBaseInternalFormat() const;
+    void setGLBaseInternalFormat(quint32 format);
+
+    QByteArray logName() const;
+    void setLogName(const QByteArray &name);
+
+private:
+    QSharedDataPointer<QTextureFileDataPrivate> d;
+};
+
+Q_DECLARE_TYPEINFO(QTextureFileData, Q_MOVABLE_TYPE);
+
+Q_GUI_EXPORT QDebug operator<<(QDebug dbg, const QTextureFileData &d);
+
+QT_END_NAMESPACE
+
+#endif // QABSTRACTLAYOUTSTYLEINFO_P_H