How does unity convert RawImage's RenderTure image into Sprite

How does unity convert RawImage's RenderTure image into Sprite

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First, the purpose

Through the dynamic image capture under RawImage, a lot of images are generated and arranged in the UI.

2. RenderTure cannot be converted directly

1. First convert RenderTure to Texture2d

The code is as follows (example):

[SerializeField] RawImage Photo = null;
Texture2D texture2D = new Texture2D(Photo.texture.width, Photo.texture.height, TextureFormat.ARGB32, false);
            RenderTexture.active = renderT;
            texture2D.ReadPixels(new Rect(0, 0, Photo.texture.width, Photo.texture.height), 0, 0);
            texture2D.Apply();

2. Then convert the obtained Texture2d into Sprite

The code is as follows (example):

Sprite sprite = Sprite.Create(texture2D,
            new Rect(0, 0, Photo.texture.width, Photo.texture.height),
            new Vector2(0.5f, 0.5f));
            var targetTex = new Texture2D((int)sprite.rect.width, (int)sprite.rect.height);
            var pixels = sprite.texture.GetPixels(
                (int)sprite.textureRect.x,
                (int)sprite.textureRect.y,
                (int)sprite.textureRect.width,
                (int)sprite.textureRect.height);
            targetTex.SetPixels(pixels);
            targetTex.Apply();

The data requested by the url network used here.

3. Finally, assign the generated Sprite directly to the sprite of the Image

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