QImage 和 QPixmap 有什么区别?
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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