GDI + quick drawing of transparent windows

GDI + quickly draws a transparent window:

Method 1:

1. Use an iamge object to load PNG resources,

2. Call the drawimage function to show that the image is drawn.

3. updatelayeredwindow Layout

Method 2:

1. Load resources with bitmap objects

2. Select from CDC and copy bitblt or alphablend to the target CDC.

3. updatelayeredwindow layout the HDC on the target CDC to achieve the effect of fusion background.

Method 1 is a conventional method, but the efficiency of the drawimage function is too low. If you want to implement real-time update, there will be problems.

Method 2: I figured out that bitblt and alphablend are much more efficient than drawimage.

GDI + quick drawing of transparent windows