QImage和QPixmap有什么区别？ [英] What is the difference between QImage and QPixmap?

问题描述

我不明白QImage和QPixmap之间的区别，它们似乎提供相同的功能。我应该在什么时候使用QImage和何时使用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

Easilly通过阅读 QImage 和 QPixmap ：

Easilly answered by reading the docs on QImage and QPixmap:

QPixmap 类是

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

QImage 类提供与硬件无关的图像

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.

编辑：允许直接访问像素数据， >另外，从@ 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.

并从@Arnold：

以下是一个通常（并不总是）适用的简短摘要：

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

• 如果您打算操作图片，修改图片，
  等，使用QImage。


• 如果您计划在屏幕上多次绘制相同的图像
  ，请将其转换为QPixmap。

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