Home/ Questions/Q 7665319
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-31T14:32:03+00:00

I have a C++ Open GL application that renders an animation display, and captures

  • 0

I have a C++ Open GL application that renders an animation display, and captures the frame-buffer contents using glReadPixels(), which is then stored as a 1D char array.

I can get the buffer contents and save it to a char array, as follow:

char * values = (char *) malloc(width * height * 4 * sizeof(char));
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, values);

I then send these raw data over the network using socket, which is not an issue for me.
I have a Qt Desktop Client (which communicates with the OpenGL application using socket)

This client program can successfully receive the raw binary data sent by the Open GL application.

How can I render an image from these binary data in my client application?
Does Qt has any built-in function / library to draw an image from binary data (which is generated from glReadPixels)?

Do I need to encode / decode these raw binary data as base64 type prior to send them via sockets? Why or why not?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    QImage has a nice constructor that takes an existing buffer, a width, a height and a pixel format. That seems like an excellent place to start.

    And if you create the QImage on the server, you can use Qt’s built-in streaming to send a QImage to your clients (QDataStreams can wrap just about any IO device, including network sockets), so there’s no need to do any encoding and decoding yourself – Qt will take care of everything for you.

    Hope that helps!

    • 0