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Asked: 2026-05-28T21:31:59+00:00

I have a buffer (uint8[] of BGR pixel data) in C holding a video

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I have a buffer (uint8[] of BGR pixel data) in C holding a video frame. A pointer to this buffer is passed back by the C code to C# code as an IntPtr. I require to add a text overlay to the each frame and then pass on a pointer to the frame for further processing. I believe what I need to do (in C#) is to copy each frame to a bitmap object, get the device context of the bitmap and use then use TextOut (etc) to write text to the bitmap. I would then copy the modified bitmap frame data back to my original array.

My question is twofold:

  1. Is this the best approach?
  2. What is the best (fastest) way to copy the data from my IntPtr to a bitmap object.

Thanks.

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1 Answer

  1. Editorial Team

    The fastest way is by not copying the data. That requires that your data is in a supported pixel format, BGR sounds a bit scary but odds are high it is actually PixelFormat.Format24bppRgb.

    Which then allows you to use the Bitmap(int, int, int, PixelFormat, IntPtr constructor).

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