c++ - 从缓冲区创建 QImage，没有深拷贝？

Question

在 Qt 中，如何从字节数组 ('uint8_t*`) 构造一个 QImage 对象，而不创建深层拷贝，仅引用我的数据数组？

Answer 1

例如，使用任何采用uchar * 的构造函数

QImage::QImage(uchar *data, 
               int width, 
               int height, 
               int bytesPerLine, 
               Format format, 
               QImageCleanupFunction cleanupFunction = Q_NULLPTR, 
               void *cleanupInfo = Q_NULLPTR)

正如文档所说:

The buffer must remain valid throughout the life of the QImage and all copies that have not been modified or otherwise detached from the original buffer. The image does not delete the buffer at destruction. You can provide a function pointer cleanupFunction along with an extra pointer cleanupInfo that will be called when the last copy is destroyed.