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/****************************************************************************
**
** 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 constexpr 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
};
QPkmHandler::~QPkmHandler() = default;
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);
texData.setNumFaces(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
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