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Bug
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Resolution: Done
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P2: Important
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None
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5.2.0
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None
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Qt 5.2 from git stable branch
Linux (Ubuntu 12.10)
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486d367e8086e63f51707e78c07ef77fa6240f0a
Segfault occurs in the code below.
I am using Qt 5.2 stable from git.
int QSGOpaqueTextureMaterial::compare(const QSGMaterial *o) const { Q_ASSERT(o && type() == o->type()); const QSGOpaqueTextureMaterial *other = static_cast<const QSGOpaqueTextureMaterial *>(o); if (int diff = m_texture->textureId() - other->texture()->textureId()) return diff; return int(m_filtering) - int(other->m_filtering); }
on
if (int diff = m_texture->textureId() - other->texture()->textureId())
because other->texture() returns 0
I am not sure why this happens.
In my case it appears to happen when my QQuickImageProvider::requestPixmap returns a pixmap without alpha channel. For example:
QPixmap RoundedImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize) { int width = 800; int height = 800; if (size) *size = QSize(width, height); QPixmap pixmap(requestedSize.width() > 0 ? requestedSize.width() : width, requestedSize.height() > 0 ? requestedSize.height() : height); pixmap.fill(Qt::red); // Draw on pixmap here return pixmap; }
might cause the segfault but if I replace Qt::red with Qt::transparent there is no segfault. There is also no segfault if I first fill with Qt::transparent and then with Qt::red (probably because the pixmap gets an alpha channel then)
Might be worth to check out what might actually go wrong? Perhaps other problems are triggered by the offending code.
- is required for
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- Closed
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