Texture2D.GetPixelData

参数

描述

Gets raw data from a Texture for reading or writing.

This function returns a direct "view" into the Texture pixel data as a Unity.Collections.NativeArray.

A slice of the data will be returned according to the requested mip level. For example, for a 16x16 sized Texture of RGBA32 format, getting the mip=1 level (8x8 size) will result in a 256-byte array or a 64-element array if Color32 is used as a type.

You can read from and write to the returned array. If you write to it, you must call the Apply method to upload the Texture to the GPU. If an array returned by GetPixelData was used to fill up a non-0 level mipmap, then updateMipmaps must be set to false before calling the Apply method.

GetPixelData does not allocate memory; the returned NativeArray directly points to the Texture system memory data buffer.

It is recommended to immediately use or modify the data retrieved by this method and to not store the returned array for later use as the returned array can become invalid (i.e. it no longer points to valid memory) if the Texture is modified or updated after you called this method.

See Also: Apply, SetPixels, SetPixels32, GetPixelData.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    public void Start()
    {
        var m_Texture2D = new Texture2D(16, 16, TextureFormat.RGBA32, true);
        var mip0Data = m_Texture2D.GetPixelData<Color32>(1);


        // pixels in mip = 1 are filled with white color
        for (int i = 0; i < mip0Data.Length; i++)
        {
            mip0Data[i] = new Color32(255, 255, 255, 255);
        }

        m_Texture2D.Apply(false);
    }
}