mirror of
https://github.com/crystalidea/qt6windows7.git
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91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
// Copyright (C) 2018 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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static const quint32 DDS_MAGIC = 0x20534444; // 'DDS '
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static const quint32 DDS_FOURCC = 4;
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#define FOURCC(c0, c1, c2, c3) ((c0) | ((c1) << 8) | ((c2) << 16) | ((c3 << 24)))
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struct DDS_PIXELFORMAT {
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quint32 size;
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quint32 flags;
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quint32 fourCC;
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quint32 rgbBitCount;
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quint32 rBitMask;
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quint32 gBitMask;
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quint32 bBitMask;
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quint32 aBitMask;
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};
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struct DDS_HEADER {
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quint32 size;
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quint32 flags;
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quint32 height;
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quint32 width;
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quint32 pitch;
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quint32 depth;
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quint32 mipMapCount;
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quint32 reserved1[11];
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DDS_PIXELFORMAT pixelFormat;
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quint32 caps;
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quint32 caps2;
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quint32 caps3;
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quint32 caps4;
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quint32 reserved2;
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};
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static quint32 bc1size(const QSize &size)
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{
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static const quint32 blockSize = 8; // 8 bytes for BC1
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const quint32 bytesPerLine = qMax<quint32>(1, (size.width() + 3) / 4) * blockSize;
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const quint32 ySize = qMax<quint32>(1, (size.height() + 3) / 4);
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return bytesPerLine * ySize;
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}
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static QByteArrayList loadBC1(const QString &filename, QSize *size)
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{
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QFile f(filename);
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if (!f.open(QIODevice::ReadOnly)) {
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qWarning("Failed to open %s", qPrintable(filename));
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return QByteArrayList();
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}
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quint32 magic = 0;
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f.read(reinterpret_cast<char *>(&magic), sizeof(magic));
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if (magic != DDS_MAGIC) {
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qWarning("%s is not a DDS file", qPrintable(filename));
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return QByteArrayList();
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}
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DDS_HEADER header;
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f.read(reinterpret_cast<char *>(&header), sizeof(header));
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if (header.size != sizeof(DDS_HEADER)) {
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qWarning("Invalid DDS header size");
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return QByteArrayList();
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}
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if (header.pixelFormat.size != sizeof(DDS_PIXELFORMAT)) {
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qWarning("Invalid DDS pixel format size");
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return QByteArrayList();
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}
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if (!(header.pixelFormat.flags & DDS_FOURCC)) {
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qWarning("Invalid DDS pixel format");
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return QByteArrayList();
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}
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if (header.pixelFormat.fourCC != FOURCC('D', 'X', 'T', '1')) {
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qWarning("Only DXT1 (BC1) is supported");
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return QByteArrayList();
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}
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QByteArrayList data;
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QSize sz(header.width, header.height);
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for (quint32 level = 0; level < header.mipMapCount; ++level) {
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data.append(f.read(bc1size(sz)));
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sz.setWidth(qMax(1, sz.width() / 2));
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sz.setHeight(qMax(1, sz.height() / 2));
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}
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if (size)
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*size = QSize(header.width, header.height);
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return data;
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}
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