diff options
Diffstat (limited to 'src/gui/util/qastchandler.cpp')
-rw-r--r-- | src/gui/util/qastchandler.cpp | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/gui/util/qastchandler.cpp b/src/gui/util/qastchandler.cpp new file mode 100644 index 0000000000..6d163c6701 --- /dev/null +++ b/src/gui/util/qastchandler.cpp @@ -0,0 +1,168 @@ +/**************************************************************************** +** +** 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 |