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

   Texture2D screenShot;//保存截取的纹理public Image image;  //显示截屏的Imagepublic 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streamingAssetsbyte[] 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Imagepublic 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streamingAssetsbyte[] 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

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_EDITORbyte[] bytes = merge_image.EncodeToJPG();string filename = Application.streamingAssetsPath + "/Screenshot" + UnityEngine.Random.Range(0, 1000) + ".png";File.WriteAllBytes(filename, bytes);
#endifDownLoad(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_EDITORDebug.Log("<color=blue>编辑器无法下载</color>");
#elseif (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Texture2DTexture2D 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
}

四、调用js方法下载图片

在Plugins文件夹下新建

ImageDownloader.jslib

放入下面代码

var ImageDownloaderPlugin = {ImageDownloader: function (str, fn) {console.log("start jslib download");var msg = UTF8ToString(str);var fname = UTF8ToString(fn);var contentType = 'image/jpeg';function fixBinary(bin) {var length = bin.length;var buf = new ArrayBuffer(length);var arr = new Uint8Array(buf);for (var i = 0; i < length; i++) {arr[i] = bin.charCodeAt(i);}return buf;}var binary = fixBinary(atob(msg));var data = new Blob([binary], { type: contentType });var link = document.createElement('a');link.download = fname;link.innerHTML = 'DownloadFile';link.setAttribute('id', 'ImageDownloaderLink');link.href = window.URL.createObjectURL(data);link.onclick = function () {var child = document.getElementById('ImageDownloaderLink');child.parentNode.removeChild(child);};link.style.display = 'none';document.body.appendChild(link);link.click();window.URL.revokeObjectURL(link.href);}
};
mergeInto(LibraryManager.library, ImageDownloaderPlugin)