QImage 和 QPixmap 有什么区别?

2021-12-09 00:00:00 qt qimage qpixmap c++

我不明白 QImage 和 QPixmap 之间有什么区别,它们似乎提供相同的功能.什么时候应该使用 QImage,什么时候应该使用 QPixmap?

I do not understand what is the difference between QImage and QPixmap, they seem to offer the same functionality. When should I use a QImage and when should I use a QPixmap?

推荐答案

通过阅读 QImage 和 QPixmap:

QPixmap 类是一种离屏图像表示,可用作绘图设备.

The QPixmap class is an off-screen image representation that can be used as a paint device.

QImage 类提供独立于硬件的图像表示,允许直接访问像素数据,并可用作绘制设备.

The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.

另外,来自@Dave 的回答:

Also, from @Dave's answer:

你不能在 GUI 线程之外操作 QPixmap,但 QImage 没有这样的限制.

You can't manipulate a QPixmap outside the GUI-thread, but QImage has no such restriction.

来自@Arnold:

以下是通常(并非总是)适用的简短摘要:

Here's a short summary that usually (not always) applies:

  • 如果您打算操作、修改、更改图像上的像素,等,使用 QImage.
  • 如果您打算多次绘制相同的图像在屏幕上,将其转换为 QPixmap.

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