如何从字节数组创建图像并显示它？

Question

我想从图像文件中获取数据并在 Unity 可以读取的纹理中显示该信息。

我能够将像素信息放入字节数组中，但屏幕上没有任何显示。我如何真正让图像显示？

     pcxFile = File.ReadAllBytes("Assets/5_ImageParser/bagit_icon.pcx");

     int startPoint = 128;

     int height = 152; 

     int width = 152; 

     target = new Texture2D(height, width);

     for (var y = 0; y < height; y++)

     {

         for (var x = 0; x < width; x++)

         {

             timesDone ++;

             pixels[x, y] = new Color(pcxFile[startPoint], pcxFile[startPoint+1], pcxFile[startPoint+2]);

             startPoint += 4;

             target.SetPixel(x, y, pixels[x, y]);

         }            

     }

     target.Apply();

     target.EncodeToJPG();

Answer 1

好吧，（假设您正确获取像素数据）您必须将创建的纹理分配给某些东西......我会使用例如RawImage，因为它不需要 a Sprite（就像UI.Image组件一样 - 另请参阅RawImage Manual）：// Reference this in the Inspectorpublic RawImage image;//...pcxFile = File.ReadAllBytes("Assets/5_ImageParser/bagit_icon.pcx");int startPoint = 128;int height = 152;&nbsp;int width = 152;&nbsp;target = new Texture2D(height, width);for (var y = 0; y < height; y++){&nbsp; &nbsp; for (var x = 0; x < width; x++)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; timesDone ++;&nbsp; &nbsp; &nbsp; &nbsp; pixels[x, y] = new Color(pcxFile[startPoint], pcxFile[startPoint+1], pcxFile[startPoint+2]);&nbsp; &nbsp; &nbsp; &nbsp; startPoint += 4;&nbsp; &nbsp; &nbsp; &nbsp; target.SetPixel(x, y, pixels[x, y]);&nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;}target.Apply();// You don't need this. Only if you are also going to save it locally// as an actual *.jpg file or if you are going to// e.g. upload it later via http POST//// In this case however you would have to asign the result&nbsp;// to a variable in order to use it later//var rawJpgBytes = target.EncodeToJPG();// Assign the texture to the RawImage componentimage.texture = target;或者，与普通Image组件一起使用Sprite从您的纹理创建一个Sprite.Create：// Reference this in the Inspectorpublic Image image;// ...var sprite = Sprite.Create(target, new Rect(0.0f, 0.0f, target.width, target.height), new Vector2(0.5f, 0.5f), 100.0f);image.sprite = sprite;提示 1为了获得正确的纵横比，我通常使用一个小技巧：为这个 RawImage 创建一个父对象RectTransform在父级中设置所需的“最大尺寸”RawImage在/旁边Image（在子对象上）添加一个AspectRatioFitter（另见AspectRatioFitter Manual）并设置AspectMode为FitInParent.现在在代码中调整纵横比（从纹理中获取）：public RawImage image;public AspectRatioFitter fitter;//...image.texture = target;var ratio = target.width / target.height;fitter.aspectRatio = ratio;提示 2对所有像素调用一次比重复调用“便宜” ：SetPixelsSetPixel// ...startPoint = 0;pixels = new Color[width * height]();for(int i = 0; i < pixels.Length; i++){&nbsp; &nbsp; pixels[i] = new Color(pcxFile[startPoint], pcxFile[startPoint+1], pcxFile[startPoint+2]);&nbsp; &nbsp; startPoint += 4;}target.SetPixels(pixels);target.Apply();// ...（我不知道您的pcx格式究竟是如何工作的，但也许您甚至可以使用LoadRawTextureData