Texture2D.GetPixels

参数

返回

Color[] An array that contains the pixel colors.

描述

Gets the pixel color data for a mipmap level as Color structs.

This method gets pixel data from the texture in CPU memory. Texture.isReadable must be true.

The array contains the pixels row by row, starting at the bottom left of the texture. The size of the array is the width × height of the mipmap level.

Each pixel is a Color struct. GetPixels might be slower than some other texture methods because it converts the format the texture uses into Color. GetPixels also needs to decompress compressed textures, and use memory to store the decompressed area. To get pixel data more quickly, use GetPixelData instead.

A single call to GetPixels is usually faster than multiple calls to GetPixel, especially for large textures.

If GetPixels fails, Unity throws an exception. GetPixels might fail if the array contains too much data. Use GetPixelData or GetRawTextureData instead for very large textures.

You can't use GetPixel with textures that use Crunch texture compression. Use GetPixels32 instead.

using UnityEngine;

public class Texture2DExample : MonoBehaviour
{
    public Texture2D source;
    public Texture2D destination;

    void Start()
    {
        // Get a copy of the color data from the source Texture2D, in high-precision float format.
        // Each element in the array represents the color data for an individual pixel.
        int sourceMipLevel = 0;
        Color[] pixels = source.GetPixels(sourceMipLevel);

        // If required, manipulate the pixels before applying them to the destination Texture2D.
        // This example code reverses the array, which rotates the image 180 degrees.
        System.Array.Reverse(pixels, 0, pixels.Length);

        // Set the pixels of the destination Texture2D.
        int destinationMipLevel = 0;
        destination.SetPixels(pixels, destinationMipLevel);

        // Apply changes to the destination Texture2D, which uploads its data to the GPU.
        destination.Apply();
    }
}

Additional resources: SetPixels, mipmapCount, GetPixelData, GetPixels32.

参数

返回

Color[] An array that contains the pixel colors.

描述

Gets the pixel color data for part of a mipmap level as Color structs.

This version of GetPixels returns part of a mipmap level instead of the whole mipmap level.

// Get a rectangular area of a texture and place it into
// a new texture the size of the rectangle.
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    // Source texture and the rectangular area we want to extract.
    public Texture2D sourceTex;
    public Rect sourceRect;

    void Start()
    {
        int x = Mathf.FloorToInt(sourceRect.x);
        int y = Mathf.FloorToInt(sourceRect.y);
        int width = Mathf.FloorToInt(sourceRect.width);
        int height = Mathf.FloorToInt(sourceRect.height);

        Color[] pix = sourceTex.GetPixels(x, y, width, height);
        Texture2D destTex = new Texture2D(width, height);
        destTex.SetPixels(pix);
        destTex.Apply();

        // Set the current object's texture to show the
        // extracted rectangle.
        GetComponent<Renderer>().material.mainTexture = destTex;
    }
}