add example4

unity_project/Assets/example4/EncodeToWebP.cs

@@ -0,0 +1,84 @@
+using System;
+using UnityEngine;
+using UnityEngine.UI;
+using WebP;
+
+public class EncodeToWebP : MonoBehaviour
+{
+    public RawImage FromImage;
+    public RawImage ToImage;
+
+    void Start()
+    {
+        LoadWebp(FromImage, Resources.Load<TextAsset>("webp").bytes);
+        TestEncodeToWebP(FromImage, ToImage);
+    }
+
+    void LoadWebp(RawImage image, byte[] bytes)
+    {
+        Error lError;
+        Texture2D texture = Texture2DExt.CreateTexture2DFromWebP(bytes, lMipmaps: true, lLinear: true, lError: out lError);
+
+        if (lError == Error.Success)
+        {
+            image.texture = texture;
+        }
+        else
+        {
+            Debug.LogError("Webp Load Error : " + lError.ToString());
+        }
+    }
+    void TestEncodeToWebP(RawImage fromImage, RawImage toImage)
+    {
+        var texture = fromImage.texture;
+        RenderTexture tmp = RenderTexture.GetTemporary(
+                            texture.width,
+                            texture.height,
+                            0,
+                            RenderTextureFormat.Default,
+                            RenderTextureReadWrite.Linear);
+
+        // Blit the pixels on texture to the RenderTexture
+        Graphics.Blit(texture, tmp);
+        // Backup the currently set RenderTexture
+        RenderTexture previous = RenderTexture.active;
+        // Set the current RenderTexture to the temporary one we created
+        RenderTexture.active = tmp;
+
+        // Create a new readable Texture2D to copy the pixels to it
+        Texture2D myTexture2D = new Texture2D(texture.width, texture.height);
+
+        // Copy the pixels from the RenderTexture to the new Texture
+        myTexture2D.ReadPixels(new Rect(0, 0, tmp.width, tmp.height), 0, 0);
+        myTexture2D.Apply();
+
+        // Reset the active RenderTexture
+        RenderTexture.active = previous;
+
+        // Release the temporary RenderTexture
+        RenderTexture.ReleaseTemporary(tmp);
+
+        {// Flip updown.
+         // ref: https://github.com/netpyoung/unity.webp/issues/25
+            Color[] pixels = myTexture2D.GetPixels();
+            Color[] pixelsFlipped = new Color[pixels.Length];
+            var w = myTexture2D.width;
+            var h = myTexture2D.height;
+            for (int y = 0; y < h; y++)
+            {
+                Array.Copy(pixels, y * h, pixelsFlipped, (h - y - 1) * w, w);
+            }
+            myTexture2D.SetPixels(pixelsFlipped);
+        }
+
+        byte[] bytes = myTexture2D.EncodeToWebP(25, out Error lError);
+        if (lError == Error.Success)
+        {
+            LoadWebp(ToImage, bytes);
+        }
+        else
+        {
+            Debug.LogError("Webp EncodeToWebP Error : " + lError.ToString());
+        }
+    }
+}