1 files changed, 126 insertions, 0 deletions
diff --git a/src/gui/util/qpkmhandler.cpp b/src/gui/util/qpkmhandler.cpp
new file mode 100644
index 0000000000..e0c3b75efe
--- /dev/null
+++ b/src/gui/util/qpkmhandler.cpp
@@ -0,0 +1,126 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpkmhandler_p.h"
+#include "qtexturefiledata_p.h"
+
+#include <QFile>
+#include <QDebug>
+#include <QSize>
+#include <qendian.h>
+
+//#define ETC_DEBUG
+
+QT_BEGIN_NAMESPACE
+
+static const int headerSize = 16;
+
+struct PkmType
+{
+    quint32 glFormat;
+    quint32 bytesPerBlock;
+};
+
+static PkmType typeMap[5] = {
+    { 0x8D64,  8 },   // GL_ETC1_RGB8_OES
+    { 0x9274,  8 },   // GL_COMPRESSED_RGB8_ETC2
+    { 0, 0 },         // unused (obsolete)
+    { 0x9278, 16},    // GL_COMPRESSED_RGBA8_ETC2_EAC
+    { 0x9276,  8 }    // GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
+};
+
+bool QPkmHandler::canRead(const QByteArray &suffix, const QByteArray &block)
+{
+    Q_UNUSED(suffix)
+
+    return block.startsWith("PKM ");
+}
+
+QTextureFileData QPkmHandler::read()
+{
+    QTextureFileData texData;
+
+    if (!device())
+        return texData;
+
+    QByteArray fileData = device()->readAll();
+    if (fileData.size() < headerSize || !canRead(QByteArray(), fileData)) {
+        qCDebug(lcQtGuiTextureIO, "Invalid PKM file %s", logName().constData());
+        return QTextureFileData();
+    }
+    texData.setData(fileData);
+
+    const char *rawData = fileData.constData();
+
+    // ignore version (rawData + 4 & 5)
+
+    // texture type
+    quint16 type = qFromBigEndian<quint16>(rawData + 6);
+    if (type >= sizeof(typeMap)/sizeof(typeMap[0])) {
+        qCDebug(lcQtGuiTextureIO, "Unknown compression format in PKM file %s", logName().constData());
+        return QTextureFileData();
+    }
+    texData.setGLFormat(0);                    // 0 for compressed textures
+    texData.setGLInternalFormat(typeMap[type].glFormat);
+    //### setBaseInternalFormat
+
+    // texture size
+    texData.setNumLevels(1);
+    const int bpb = typeMap[type].bytesPerBlock;
+    QSize paddedSize(qFromBigEndian<quint16>(rawData + 8), qFromBigEndian<quint16>(rawData + 10));
+    texData.setDataLength((paddedSize.width() / 4) * (paddedSize.height() / 4) * bpb);
+    QSize texSize(qFromBigEndian<quint16>(rawData + 12), qFromBigEndian<quint16>(rawData + 14));
+    texData.setSize(texSize);
+
+    texData.setDataOffset(headerSize);
+
+    if (!texData.isValid()) {
+        qCDebug(lcQtGuiTextureIO, "Invalid values in header of PKM file %s", logName().constData());
+        return QTextureFileData();
+    }
+
+    texData.setLogName(logName());
+
+#ifdef ETC_DEBUG
+    qDebug() << "PKM file handler read" << texData;
+#endif
+    return texData;
+}
+
+QT_END_NAMESPACE