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-rw-r--r--src/gui/util/qastchandler.cpp168
1 files changed, 168 insertions, 0 deletions
diff --git a/src/gui/util/qastchandler.cpp b/src/gui/util/qastchandler.cpp
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+++ b/src/gui/util/qastchandler.cpp
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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