Decrease screenshot resolution

Hi!
I need to decrease screenshot resolution. I use this function to take screenshot:
https://docs.unity3d.com/ScriptReference/ScreenCapture.CaptureScreenshotAsTexture.html

I need to use this function. It gets me Texture2D as result. I need only preview(25% of full resolution), then it on screenshot.

Anyone knows how to resolve my issue(reduce resolution of Texture2D runtime)?

 

I think a hack thats used is to render the game at whatever res you want for one frame, capture that and mive back to the regular res.

Might be able to take advantage of another camera but i never tried it myself.

Could also just scale it down

 

Yeah, instead of getting a Texture2D from CaptureScreenShotAsTexture, you could use a render texture, then you could use whatever size texture that you want.

https://docs.unity3d.com/Manual/class-RenderTexture.html

 

https://docs.unity3d.com/ScriptReference/Texture2D.Resize.html

 

I can't user Camera.renderTexture = tempRenderTexture, because we need capture UI too. But canvas has ScreenOverlay settings.
https://docs.unity3d.com/ScriptReference/Graphics.Blit.html - this function works for me. Thanks for all!!

 

Hi can you please provide example code you used? Running into the same problem and unsure how to implement Blit

 

I don't remember regarding Blit, but for now we are using this code.

Code (CSharp):

1. public static void Scale(this Texture2D inputTexture, int width, int height, FilterMode mode = FilterMode.Trilinear)
2. {
3.     var textureRect = new Rect(0,0,width,height);
4.     GPUScale(inputTexture,width,height,mode);
5.  
6.     inputTexture.Resize(width, height);
7.     inputTexture.ReadPixels(textureRect,0,0,true);
8.     inputTexture.Apply(false);
9. }
10.  
11. private static void GPUScale(Texture2D src, int width, int height, FilterMode filterMode)
12. {
13.     src.filterMode = filterMode;
14.     src.Apply(false);
15.     var renderTexture = new RenderTexture(width, height, 32);
16.     Graphics.SetRenderTarget(renderTexture);
17.     GL.LoadPixelMatrix(0,1,1,0);
18.     GL.Clear(true,true,new Color(0,0,0,0));
19.     Graphics.DrawTexture(new Rect(0,0,1,1),src);
20.     Object.Destroy(renderTexture);
21. }
22.  

and few more fragments of code:

Code (CSharp):

1. var thumbnailRenderTexture = RenderTexture.GetTemporary(Screen.width, Screen.height, 0, RenderTextureFormat.ARGB32);
2.             ScreenCapture.CaptureScreenshotIntoRenderTexture(thumbnailRenderTexture);
3.             var composer = _cameraSystem.CameraController.CinemachineComposer;
4.             AsyncGPUReadback.Request(thumbnailRenderTexture, 0, TextureFormat.ARGB32, (request) => OnCompleteReadback(@event, composer, request));
5.             RenderTexture.ReleaseTemporary(thumbnailRenderTexture);
6.            
7.             RenderTexture.active = originalRenderTexture;
8.             thumbnailCamera.targetTexture = cameraTexture;
9.         }
10.  
11.         private void OnCompleteReadback(Event ev, CinemachineComposer composer, AsyncGPUReadbackRequest request, Action callback = null)
12.         {
13.             if (request.hasError)
14.             {
15.                 Debug.LogError("GPU readback error detected.");
16.                 return;
17.             }
18.  
19.             var originalPixels = request.GetData<uint>();
20.  
21.             _eventPreviewThumbnailsCreator.TakeThumbnail(ev, originalPixels, composer);
22.             _eventTimelineThumbnailCreator.TakeThumbnail(ev, originalPixels, composer, _onComplete);
23.             _renderTexture.Release();
24.             _renderTexture.DiscardContents(true, true);
25.             callback?.Invoke();
26.         }

 

Thank you.

How do I copy and paste this code without the line numbers?

 

No. This causes a massive hitch of like 5 seconds on my high end iMac.