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/****************************************************************************
**
** Copyright (C) 2019 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 "qastchandler_p.h"
#include "qtexturefiledata_p.h"
#include <private/qnumeric_p.h>
#include <QFile>
#include <QDebug>
#include <QSize>
QT_BEGIN_NAMESPACE
struct AstcHeader
{
quint8 magic[4];
quint8 blockDimX;
quint8 blockDimY;
quint8 blockDimZ;
quint8 xSize[3];
quint8 ySize[3];
quint8 zSize[3];
};
bool QAstcHandler::canRead(const QByteArray &suffix, const QByteArray &block)
{
Q_UNUSED(suffix)
return block.startsWith("\x13\xAB\xA1\x5C");
}
quint32 QAstcHandler::astcGLFormat(quint8 xBlockDim, quint8 yBlockDim) const
{
static const quint32 glFormatRGBABase = 0x93B0; // GL_COMPRESSED_RGBA_ASTC_4x4_KHR
static const quint32 glFormatSRGBBase = 0x93D0; // GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR
static QSize dims[14] = {
{ 4, 4 }, // GL_COMPRESSED_xxx_ASTC_4x4_KHR
{ 5, 4 }, // GL_COMPRESSED_xxx_ASTC_5x4_KHR
{ 5, 5 }, // GL_COMPRESSED_xxx_ASTC_5x5_KHR
{ 6, 5 }, // GL_COMPRESSED_xxx_ASTC_6x5_KHR
{ 6, 6 }, // GL_COMPRESSED_xxx_ASTC_6x6_KHR
{ 8, 5 }, // GL_COMPRESSED_xxx_ASTC_8x5_KHR
{ 8, 6 }, // GL_COMPRESSED_xxx_ASTC_8x6_KHR
{ 8, 8 }, // GL_COMPRESSED_xxx_ASTC_8x8_KHR
{ 10, 5 }, // GL_COMPRESSED_xxx_ASTC_10x5_KHR
{ 10, 6 }, // GL_COMPRESSED_xxx_ASTC_10x6_KHR
{ 10, 8 }, // GL_COMPRESSED_xxx_ASTC_10x8_KHR
{ 10, 10 }, // GL_COMPRESSED_xxx_ASTC_10x10_KHR
{ 12, 10 }, // GL_COMPRESSED_xxx_ASTC_12x10_KHR
{ 12, 12 } // GL_COMPRESSED_xxx_ASTC_12x12_KHR
};
const QSize dim(xBlockDim, yBlockDim);
int index = -1;
for (int i = 0; i < 14; i++) {
if (dim == dims[i]) {
index = i;
break;
}
}
if (index < 0)
return 0;
bool useSrgb = qEnvironmentVariableIsSet("QT_ASTCHANDLER_USE_SRGB")
|| logName().toLower().contains("srgb");
return useSrgb ? (glFormatSRGBBase + index) : (glFormatRGBABase + index);
}
QTextureFileData QAstcHandler::read()
{
QTextureFileData nullData;
QTextureFileData res;
if (!device())
return nullData;
QByteArray fileData = device()->readAll();
if (fileData.size() < int(sizeof(AstcHeader)) || !canRead(QByteArray(), fileData)) {
qCDebug(lcQtGuiTextureIO, "Not an ASTC file: %s", logName().constData());
return nullData;
}
res.setData(fileData);
const AstcHeader *header = reinterpret_cast<const AstcHeader *>(fileData.constData());
int xSz = int(header->xSize[0]) | int(header->xSize[1]) << 8 | int(header->xSize[2]) << 16;
int ySz = int(header->ySize[0]) | int(header->ySize[1]) << 8 | int(header->ySize[2]) << 16;
int zSz = int(header->zSize[0]) | int(header->zSize[1]) << 8 | int(header->zSize[2]) << 16;
quint32 glFmt = astcGLFormat(header->blockDimX, header->blockDimY);
if (!xSz || !ySz || !zSz || !glFmt || header->blockDimZ != 1) {
qCDebug(lcQtGuiTextureIO, "Invalid ASTC header data in file %s", logName().constData());
return nullData;
}
res.setSize(QSize(xSz, ySz));
res.setGLFormat(0); // 0 for compressed textures
res.setGLInternalFormat(glFmt);
//? BaseInternalFormat
int xBlocks = (xSz + header->blockDimX - 1) / header->blockDimX;
int yBlocks = (ySz + header->blockDimY - 1) / header->blockDimY;
int zBlocks = (zSz + header->blockDimZ - 1) / header->blockDimZ;
int byteCount = 0;
bool oob = mul_overflow(xBlocks, yBlocks, &byteCount)
|| mul_overflow(byteCount, zBlocks, &byteCount)
|| mul_overflow(byteCount, 16, &byteCount);
res.setDataOffset(sizeof(AstcHeader));
res.setNumLevels(1);
res.setDataLength(byteCount);
if (oob || !res.isValid()) {
qCDebug(lcQtGuiTextureIO, "Invalid ASTC file %s", logName().constData());
return nullData;
}
res.setLogName(logName());
#if 0
qDebug() << "ASTC file handler read" << res << res.dataOffset() << res.dataLength();
#endif
return res;
}
QT_END_NAMESPACE
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