StreamDeckSharp: Problem with fast draws.

Hi Christian,

i have a problem related to your project, but surely not caused by your project.

I try to compose pre loaded Images with different transformations (i.e. rotations, scales, translations) into one Bitmap using a Graphics Class inside a Timer-thread.

Problem is, that i can’t access the images in a thread, but have to invoke the UI-Thread via a delegate to do so. But the UI-Thread is only checked every 500 ms, which is way too slow for me.

        public void mydraw()
        {
            if (Thread.CurrentThread != myUIthred) //Tell the UI thread to invoke mydraw if its not himself.
            {
                BeginInvoke(myaction);
                 return;
            }
            tempg.Clear(Color.Black);        //         tempg is created elsewhere:    tempg = Graphics.FromImage(result);
            tempg.TranslateTransform(1024, 1024);
            tempg.RotateTransform((float)angle);
            tempg.TranslateTransform(-1024, -1024);
            tempg.DrawImage(back, 0, 0);    // back, middle, ring and over are preloaded images
            tempg.DrawImage(middle, 0, 0);
            tempg.DrawImage(ring, 0, 0);
            //tempg.Flush();
            tempg.TranslateTransform(1024, 1024);
            tempg.RotateTransform((float)-angle);
            tempg.TranslateTransform(-1024, -1024);
            tempg.DrawImage(over, 0, 0);
            //tempg.Flush();
            tempg.Save();

            deck.SetKeyBitmap(9, KeyBitmap.Create.FromBitmap((Bitmap)result));

            angle = angle +2;  // for testing - angles are read from simulator in a another thread
       }

I guess, while showing the videoframes on the streamdeck, you encountered the same problem.

Do you have a reciepe or tip for me, how i can achive drawing in a higher frame rate while using Bitmaps? Maybe you could push me into the right direction.

I hope it is ok for you that i ask this question via a git issue.

Gern auch auf deutsch 😃

Viele Grüße aus Bremen

Andreas