QOpenGLFramebufferObject *source,
GLbitfield buffers, GLenum filter)
{
- blitFramebuffer(target, QRect(QPoint(0, 0), target->size()),
- source, QRect(QPoint(0, 0), source->size()),
+ if (!target && !source)
+ return;
+
+ QSize targetSize;
+ QSize sourceSize;
+
+ if (target)
+ targetSize = target->size();
+ if (source)
+ sourceSize = source->size();
+
+ if (targetSize.isEmpty())
+ targetSize = sourceSize;
+ else if (sourceSize.isEmpty())
+ sourceSize = targetSize;
+
+ blitFramebuffer(target, QRect(QPoint(0, 0), targetSize),
+ source, QRect(QPoint(0, 0), sourceSize),
buffers, filter);
}