ImageConversion.EncodeToPNG

参数

描述

将该纹理编码为 PNG 格式。

返回的字节数组为 PNG“文件”。您可以将它们写入磁盘以获取 PNG 文件， 或通过网络发送等。

该函数仅适用于未压缩的非 HDR 纹理格式。 该纹理还必须在导入设置中设置了 Is Readable 标志。

对于 ARGB32、ARGB32 纹理， 编码的 PNG 数据将包含 Alpha 通道；对于 RGB24 纹理，则不包含 Alpha 通道。 PNG 数据不包含伽马校正或颜色配置文件信息。

// Saves screenshot as PNG file.
using UnityEngine;
using System.Collections;
using System.IO;

public class PNGUploader : MonoBehaviour
{
    // Take a shot immediately
    IEnumerator Start()
    {
        yield return UploadPNG();
    }

    IEnumerator UploadPNG()
    {
        // We should only read the screen buffer after rendering is complete
        yield return new WaitForEndOfFrame();

        // Create a texture the size of the screen, RGB24 format
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

        // Read screen contents into the texture
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();

        // Encode texture into PNG
        byte[] bytes = tex.EncodeToPNG();
        Object.Destroy(tex);

        // For testing purposes, also write to a file in the project folder
        // File.WriteAllBytes(Application.dataPath + "/../SavedScreen.png", bytes);


        // Create a Web Form
        WWWForm form = new WWWForm();
        form.AddField("frameCount", Time.frameCount.ToString());
        form.AddBinaryData("fileUpload", bytes);

        // Upload to a cgi script
        WWW w = new WWW("http://localhost/cgi-bin/env.cgi?post", form);
        yield return w;

        if (w.error != null)
        {
            Debug.Log(w.error);
        }
        else
        {
            Debug.Log("Finished Uploading Screenshot");
        }
    }
}

另请参阅：ReadPixels、WaitForEndOfFrame、LoadImage、EncodeToJPG。