Unity屏幕截图、区域截图、读取图片、WebGL长截屏并下载到本地jpg

一、全屏截图并保存到StreamingAssets路径下

<code> Texture2D screenShot;//保存截取的纹理

public Image image; //显示截屏的Image

public void Jietu()

{

StartCoroutine(ScrrenCapture(new Rect(0, 0, Screen.width, Screen.height), 0));

}

IEnumerator ScrrenCapture(Rect rect, int a)

{

screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);

yield return new WaitForEndOfFrame();

screenShot.ReadPixels(rect, 0, 0);

screenShot.Apply();

yield return new WaitForSeconds(0.1f);

Sprite sp = Sprite.Create(screenShot, new Rect(0, 0, screenShot.width, screenShot.height), new Vector2(0.5f, 0.5f), 100.0f);

image.sprite = sp;

//保存到streamingAssets

byte[] bytes = screenShot.EncodeToJPG();

string filename = Application.streamingAssetsPath + "/Images/Screenshot" + DateTime.UtcNow.Ticks + ".png";

File.WriteAllBytes(filename, bytes);

}

二、区域截图并保存到StreamingAssets路径下

Texture2D screenShot;//保存截取的纹理

public Image image; //显示截屏的Image

public Image im;

Texture2D texture2ds;//存储的截图

public void Jietu()

{

StartCoroutine(getScreenTexture(im.rectTransform));

}

public IEnumerator getScreenTexture(RectTransform rectT)

{

yield return new WaitForEndOfFrame();

texture2ds = new Texture2D((int)rectT.rect.width, (int)rectT.rect.height, TextureFormat.RGB24, true);

float x = rectT.localPosition.x + (Screen.width - rectT.rect.width) / 2;

float y = rectT.localPosition.y + (Screen.height - rectT.rect.height) / 2;

Rect position = new Rect(x, y, rectT.rect.width, rectT.rect.height);

texture2ds.ReadPixels(position, 0, 0, true);//按照设定区域读取像素；注意是以左下角为原点读取

texture2ds.Apply();

Sprite sp = Sprite.Create(texture2ds, new Rect(0, 0, texture2ds.width, texture2ds.height), Vector2.zero);

image.sprite = sp;

//保存到streamingAssets

byte[] bytes = texture2ds.EncodeToJPG();

string filename = Application.streamingAssetsPath + "/Images/Screenshot" + DateTime.UtcNow.Ticks + ".png";

File.WriteAllBytes(filename, bytes);

}

三、unity发布WebGL屏幕长截屏并通过浏览器下载到本地jpg文件

<code>using System.Collections;

using System.IO;

using System.Runtime.InteropServices;

using UnityEngine;

using UnityEngine.UI;

/// <summary>

/// unity发布WebGL屏幕长截屏并通过浏览器下载到本地jpg文件

/// </summary>

public class ScreenshotArea : MonoBehaviour

{

[Header("截图区域")]

public RectTransform screenshot_area;

[Header("滚动条")]

public Scrollbar scrollbar;

[Header("截图数量")]

public int number_max;

[Header("每次截图滑动条vaule的位置，从下往上记")]

public float[] number;

[Header("是否横向合并")]

public bool isHorizontal;

Texture2D[] texture2ds;//存储的截图

Texture2D merge_image;//合并后的图片

string image_name="测试";//下载后图片的名字code>

public RectTransform screenshot_area1;

public RectTransform screenshot_area2;

private void Start()

{

texture2ds = new Texture2D[number_max];

}

public void OnClick_调用()

{

Screen.fullScreen = true;

StartCoroutine(getScreenTexture(screenshot_area));

}

#region 屏幕多次截图

public IEnumerator getScreenTexture(RectTransform rectT)

{

scrollbar.value = number[0];

yield return new WaitForEndOfFrame();

for (int i = 0; i < number_max; i++)

{

texture2ds[i] = new Texture2D((int)rectT.rect.width, (int)rectT.rect.height, TextureFormat.RGB24, true);

float x = rectT.localPosition.x + (Screen.width - rectT.rect.width) / 2;

float y = rectT.localPosition.y + (Screen.height - rectT.rect.height) / 2;

Rect position = new Rect(x, y, rectT.rect.width, rectT.rect.height);

texture2ds[i].ReadPixels(position, 0, 0, true);//按照设定区域读取像素；注意是以左下角为原点读取

texture2ds[i].Apply();

if (i < number_max - 1)

scrollbar.value = number[i + 1];

if (i == 0)

{

rectT = screenshot_area;

}

if (i == number_max - 2)

{

rectT = screenshot_area1;

}

yield return new WaitForEndOfFrame();

}

merge_image = MergeImage(texture2ds); //图片合并

#if UNITY_EDITOR

byte[] bytes = merge_image.EncodeToJPG();

string filename = Application.streamingAssetsPath + "/Screenshot" + UnityEngine.Random.Range(0, 1000) + ".png";

File.WriteAllBytes(filename, bytes);

#endif

DownLoad(merge_image);//下载图片

}

#endregion

#region 下载图片

Sprite sprite;

private void DownLoad(Texture2D screenShot)

{

sprite = Sprite.Create(screenShot, new Rect(0, 0, screenShot.width, screenShot.height), new Vector2(0.5f, 0.5f));

byte[] photoByte = getImageSprite();//获取jpeg图像的字节流

if (photoByte != null)

{

DownloadImage(photoByte, image_name+".jpg");

}

else

{

Debug.LogError("<color=red>下载失败</color>");

}

}

private byte[] getImageSprite()

{

if (sprite)

{

return sprite.texture.EncodeToJPG();

}

return null;

}

#endregion

#region 调用js方法下载

[DllImport("__Internal")]

private static extern void ImageDownloader(string str, string fn);

public void DownloadImage(byte[] imageData, string imageFileName = "newpic")

{

#if UNITY_EDITOR

Debug.Log("<color=blue>编辑器无法下载</color>");

#else

if (imageData != null)

{

Debug.Log("Downloading..." + imageFileName);

ImageDownloader(System.Convert.ToBase64String(imageData), imageFileName);

}

#endif

}

#endregion

#region 合并多张图片

public Texture2D MergeImage(Texture2D[] tex)

{

if (tex.Length == 0)

return null;

//定义新图的宽高， 合并分为两种情况水平方向合并、垂直方向合并

int width = 0, height = 0;

for (int i = 0; i < tex.Length; i++)

{

if (isHorizontal == false)

{

//新图的高度

height += tex[i].height;

if (i > 0)

{

//新图的宽度，这里筛选为最宽

if (tex[i].width > tex[i - 1].width)

{

width = tex[i].width;

}

}

else width = tex[i].width; //只有一张图

}

else

{

//新图的宽度

width += tex[i].width;

if (i > 0)

{

//新图的高度，这里筛选为最高

if (tex[i].height > tex[i - 1].height)

{

height = tex[i].height;

}

}

else height = tex[i].height; //只有一张图

}

}

//初始Texture2D

Texture2D texture2D = new Texture2D(width, height);

int x = 0, y = 0;

for (int i = 0; i < tex.Length; i++)

{

//取图

Color32[] color = tex[i].GetPixels32(0);

//赋给新图

if (i > 0)

{

if (isHorizontal == false)

{

texture2D.SetPixels32(x, y += tex[i - 1].height, tex[i].width, tex[i].height, color); //高度

}

else

{

texture2D.SetPixels32(x += tex[i - 1].width, y, tex[i].width, tex[i].height, color); //宽度

}

}

else

{

texture2D.SetPixels32(x, y, tex[i].width, tex[i].height, color);

}

}

//应用

texture2D.Apply();

return texture2D;

}

#endregion

}