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Texture file support: add mipmap reading to ktx handler

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Change-Id: Ic2c10b3e64d63d2272a8a3922d2b3f99dfd45bdb
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Eirik Aavitsland 2018-08-15 10:58:12 +02:00
parent 307d0b32f0
commit 9d1c881f49
4 changed files with 46 additions and 21 deletions
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30
src/gui/util/qktxhandler.cpp
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@ -43,6 +43,11 @@
#include <QSize>
//#define KTX_DEBUG
#ifdef KTX_DEBUG
#include <QDebug>
#include <QMetaEnum>
#include <QOpenGLTexture>
#endif
QT_BEGIN_NAMESPACE
@ -68,7 +73,7 @@ struct KTXHeader {
quint32 bytesOfKeyValueData;
};
static const int headerSize = sizeof(KTXHeader);
static const quint32 headerSize = sizeof(KTXHeader);
// Currently unused, declared for future reference
struct KTXKeyValuePairItem {
@ -111,7 +116,8 @@ QTextureFileData QKtxHandler::read()
return QTextureFileData();
QByteArray buf = device()->readAll();
if (buf.size() < headerSize || !canRead(QByteArray(), buf)) {
const quint32 dataSize = quint32(buf.size());
if (dataSize < headerSize || !canRead(QByteArray(), buf)) {
qCDebug(lcQtGuiTextureIO, "Invalid KTX file %s", logName().constData());
return QTextureFileData();
}
@ -130,13 +136,17 @@ QTextureFileData QKtxHandler::read()
texData.setGLInternalFormat(decode(header->glInternalFormat));
texData.setGLBaseInternalFormat(decode(header->glBaseInternalFormat));
//### For now, ignore any additional mipmap levels
texData.setNumLevels(1);
int preambleSize = headerSize + decode(header->bytesOfKeyValueData);
if (buf.size() >= preambleSize + int(sizeof(KTXMipmapLevel))) {
texData.setDataOffset(preambleSize + sizeof(quint32)); // for the imageSize
const KTXMipmapLevel *level = reinterpret_cast<const KTXMipmapLevel *>(buf.constData() + preambleSize);
texData.setDataLength(decode(level->imageSize));
texData.setNumLevels(decode(header->numberOfMipmapLevels));
quint32 offset = headerSize + decode(header->bytesOfKeyValueData);
const int maxLevels = qMin(texData.numLevels(), 32); // Cap iterations in case of corrupt file.
for (int i = 0; i < maxLevels; i++) {
if (offset + sizeof(KTXMipmapLevel) > dataSize) // Corrupt file; avoid oob read
break;
const KTXMipmapLevel *level = reinterpret_cast<const KTXMipmapLevel *>(buf.constData() + offset);
quint32 levelLen = decode(level->imageSize);
texData.setDataOffset(offset + sizeof(KTXMipmapLevel::imageSize), i);
texData.setDataLength(levelLen, i);
offset += sizeof(KTXMipmapLevel::imageSize) + levelLen + (3 - ((levelLen + 3) % 4));
}
if (!texData.isValid()) {
@ -147,7 +157,7 @@ QTextureFileData QKtxHandler::read()
texData.setLogName(logName());
#ifdef KTX_DEBUG
qDebug() << "KTX file handler read" << texData.data();
qDebug() << "KTX file handler read" << texData;
#endif
return texData;

1
tests/auto/gui/util/qtexturefilereader/qtexturefilereader.qrc
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@ -2,5 +2,6 @@
<qresource prefix="/">
<file>texturefiles/car.ktx</file>
<file>texturefiles/pattern.pkm</file>
<file>texturefiles/car_mips.ktx</file>
</qresource>
</RCC>

BIN
tests/auto/gui/util/qtexturefilereader/texturefiles/car_mips.ktx Normal file
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36
tests/auto/gui/util/qtexturefilereader/tst_qtexturefilereader.cpp
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@ -44,26 +44,38 @@ void tst_qtexturefilereader::checkHandlers_data()
QTest::addColumn<QSize>("size");
QTest::addColumn<quint32>("glFormat");
QTest::addColumn<quint32>("glInternalFormat");
// todo: glBaseInternalFormat
QTest::addColumn<quint32>("glBaseInternalFormat");
QTest::addColumn<int>("levels");
QTest::addColumn<int>("dataOffset");
QTest::addColumn<int>("dataLength");
QTest::addColumn<QList<int>>("dataOffsets");
QTest::addColumn<QList<int>>("dataLengths");
QTest::addRow("pattern.pkm") << QStringLiteral(":/texturefiles/pattern.pkm")
<< QSize(64, 64)
<< quint32(0x0)
<< quint32(0x8d64)
<< quint32(0x0)
<< 1
<< 16
<< 2048;
<< (QList<int>() << 16)
<< (QList<int>() << 2048);
QTest::addRow("car.ktx") << QStringLiteral(":/texturefiles/car.ktx")
<< QSize(146, 80)
<< quint32(0x0)
<< quint32(0x9278)
<< quint32(0x1908)
<< 1
<< 68
<< 11840;
<< (QList<int>() << 68)
<< (QList<int>() << 11840);
QTest::addRow("car_mips.ktx") << QStringLiteral(":/texturefiles/car_mips.ktx")
<< QSize(146, 80)
<< quint32(0x0)
<< quint32(0x9274)
<< quint32(0x1907)
<< 8
<< (QList<int>() << 68 << 5992 << 7516 << 7880 << 8004 << 8056 << 8068 << 8080)
<< (QList<int>() << 5920 << 1520 << 360 << 120 << 48 << 8 << 8 << 8);
}
void tst_qtexturefilereader::checkHandlers()
@ -73,8 +85,8 @@ void tst_qtexturefilereader::checkHandlers()
QFETCH(quint32, glFormat);
QFETCH(quint32, glInternalFormat);
QFETCH(int, levels);
QFETCH(int, dataOffset);
QFETCH(int, dataLength);
QFETCH(QList<int>, dataOffsets);
QFETCH(QList<int>, dataLengths);
QFile f(fileName);
QVERIFY(f.open(QIODevice::ReadOnly));
@ -88,8 +100,10 @@ void tst_qtexturefilereader::checkHandlers()
QCOMPARE(tex.glFormat(), glFormat);
QCOMPARE(tex.glInternalFormat(), glInternalFormat);
QCOMPARE(tex.numLevels(), levels);
QCOMPARE(tex.dataOffset(), dataOffset);
QCOMPARE(tex.dataLength(), dataLength);
for (int i = 0; i < tex.numLevels(); i++) {
QCOMPARE(tex.dataOffset(i), dataOffsets.at(i));
QCOMPARE(tex.dataLength(i), dataLengths.at(i));
}
}
QTEST_MAIN(tst_qtexturefilereader)