ヽ｜∵｜ゝ(Fantom) の 開発blog？

using System.IO;
using UnityEngine;
using UnityEngine.UI;

namespace Example
{
    public class FixedImageTest : MonoBehaviour
    {
        public RawImage rawImage;
        public string path;     //背景にしたい画像のフルパスをインスペクタで入れる

        private void Start()
        {
            if (File.Exists(path))
            {
                rawImage.texture = LoadTexture2D(path);
            }
        }

        //2D画像をロード
        Texture2D LoadTexture2D(string path)
        {
            var bytes = File.ReadAllBytes(path);
            var texture = new Texture2D(2, 2, TextureFormat.ARGB32, mipChain: false);
            texture.filterMode = FilterMode.Bilinear;
            texture.Compress(false);
            texture.LoadImage(bytes);
            return texture;
        }
    }
}

// https://gist.github.com/mikezila/10557162
// This was made by aaro4130 on the Unity forums.  Thanks boss!
// https://forum.unity.com/threads/tga-loader-for-unity3d.172291/
// It's been optimized and slimmed down for the purpose of loading Quake 3 TGA textures from memory streams.

using System;
using System.IO;
using UnityEngine;

public static class TGALoader
{
    public static Texture2D LoadTGA(string fileName)
    {
        using (var imageFile = File.OpenRead(fileName))
        {
            return LoadTGA(imageFile);
        }
    }

    public static Texture2D LoadTGA(Stream TGAStream)
    {
       
        using (BinaryReader r = new BinaryReader(TGAStream))
        {
            r.BaseStream.Seek(2, SeekOrigin.Begin);
            int type = r.ReadByte();        //(offset 2) 画像形式 (1バイト)

            //フルカラー以外は非対応とする（＝RLE圧縮は展開コードが必要のため）
            if (type != 2)
            {
                throw new Exception("Only Full-color Uncompressed is supported.");
            }

            // Skip some header info we don't care about.
            // Even if we did care, we have to move the stream seek point to the beginning,
            // as the previous method in the workflow left it at the end.
            r.BaseStream.Seek(9, SeekOrigin.Current);  //offset 3 から +9 → 12

            short width = r.ReadInt16();    //(offset 12) 画像の横幅 (2バイト)
            short height = r.ReadInt16();   //(offset 14) 画像の縦幅 (2バイト)
            int bitDepth = r.ReadByte();    //(offset 16) 色深度 (1バイト)

            // Skip a byte of header information we don't care about.
            r.BaseStream.Seek(1, SeekOrigin.Current);

            Texture2D tex = new Texture2D(width, height);
            Color32[] pulledColors = new Color32[width * height];

            if (bitDepth == 32)  //アルファあり
            {
                for (int i = 0; i < width * height; i++)
                {
                    byte red = r.ReadByte();
                    byte green = r.ReadByte();
                    byte blue = r.ReadByte();
                    byte alpha = r.ReadByte();

                    pulledColors [i] = new Color32(blue, green, red, alpha);
                }
            } else if (bitDepth == 24)  //アルファなし
            {
                for (int i = 0; i < width * height; i++)
                {
                    byte red = r.ReadByte();
                    byte green = r.ReadByte();
                    byte blue = r.ReadByte();

                    /* (github のコメントから)
                     https://gist.github.com/mikezila/10557162#gistcomment-2995969
                     pulledColors [i] = new Color32(blue, green, red, 1);  //float で 1.0 と間違えた？
                     1 need to be replaced by 255, in another case, texture become transparent 
                    */                       
                    pulledColors [i] = new Color32(blue, green, red, 255);
                }
            } else
            {
                throw new Exception("TGA texture had non 32/24 bit depth.");
            }

            tex.SetPixels32(pulledColors);
            tex.Apply();
            return tex;
        }
    }
}

using System;
using System.IO;
using UnityEngine;
using UnityEngine.UI;

public class TGALoaderTest : MonoBehaviour
{
    public RawImage image;  //画像表示用
    public string path;     //画像パス

    // Use this for initialization
    private void Start()
    {
        LoadTGA(path);
    }

    void LoadTGA(string path)
    {
        try
        {
            var tex = TGALoader.LoadTGA(path);
            image.texture = tex;
        }
        catch (Exception e)
        {
            Debug.LogError(e.Message);
        }
    }
}

using System.IO;
using UnityEngine;
using UnityEngine.UI;
using B83.Image.BMP;

public class BMPLoadTest : MonoBehaviour
{
    public RawImage image;  //読み込み先（※インスペクタで UI を設定）
    public string filePath = "c:/test/image/sample.bmp"; //※ファイルは任意

    // Use this for initialization
    private void Start()
    {
        var bytes = File.ReadAllBytes(filePath);
        var loader = new BMPLoader();
        //loader.ForceAlphaReadWhenPossible = true; // can be uncomment to read alpha
        var bmpImage = loader.LoadBMP(bytes);
        image.texture = bmpImage.ToTexture2D();
    }

    private void OnDestroy()
    {
        if (image.texture != null)
        {
            Destroy(image.texture);
            image.texture = null;
        }
    }
}

using System.IO;
using System.Threading.Tasks;  //※追加
using UnityEngine;
using UnityEngine.UI;
using B83.Image.BMP;

public class BMPLoadTest : MonoBehaviour
{
    public RawImage image;  //読み込み先（※インスペクタで UI を設定）
    public string filePath = "c:/test/image/sample.bmp"; //※ファイルは任意

    // Use this for initialization
    private async void Start()      //※async を追加
    {
        var bytes = await Task.Run(() => File.ReadAllBytes(filePath));  //※Task で別スレッドで読み込み
        var loader = new BMPLoader();
        //loader.ForceAlphaReadWhenPossible = true; // can be uncomment to read alpha
        var bmpImage = await Task.Run(() => loader.LoadBMP(bytes));  //※Task で別スレッドでロード
        image.texture = bmpImage.ToTexture2D();
    }

    private void OnDestroy()
    {
        if (image.texture != null)
        {
            Destroy(image.texture);
            image.texture = null;
        }
    }
}

<?php
$fileName = "img/sample.jpg";  //ファイル名

if (file_exists($fileName)) {
    header('Content-type: image/jpeg');
    header('Content-Length: '.filesize($fileName));  //あった方が良い
    readfile($fileName);  //ファイルを読み込んで標準出力に書き出し
    exit;
}
?>

header('Content-Type: image/png');
header('Content-Type: image/gif');

<uses-permission android:name="android.permission.INTERNET" />

//テストのメイン... (※例外処理は簡略)
final int CONNECT_TIMEOUT = 15 * 1000;  //接続タイムアウト[ms]

String phpUrl = "http://(テストするサーバー)/image_out.php";  //画像送信用 PHPのURL

Bitmap bitmap = null;  //受信した画像を入れる

try {
    URL url = new URL(phpUrl);
    HttpURLConnection con = (HttpURLConnection)url.openConnection();
    con.setConnectTimeout(CONNECT_TIMEOUT);  //接続タイムアウト
    con.setRequestMethod("GET");
    con.connect();

    bitmap = BitmapFactory.decodeStream(con.getInputStream());  //画像デコード

    //確認用
    System.out.println("con.getContentType() = " + con.getContentType());
    System.out.println("con.getContentLength() = " + con.getContentLength());
    System.out.println("con.getResponseCode() = " + con.getResponseCode());
    System.out.println("con.getResponseMessage() = " + con.getResponseMessage());

    con.disconnect();

} catch (Exception e) {
    // TODO 自動生成された catch ブロック
    e.printStackTrace();
}

// ・・・・
// onDraw() などで確認する場合
if (bitmap != null) {
    canvas.drawBitmap(bitmap, 0, 0, null);
}

//リソース名で、res/drawable-～ フォルダから、画像を読み込む(Drawable) (Android 用)
public static final Drawable loadDrawableResource(String resName, Context context) throws IOException, FileNotFoundException {
    final int id = context.getResources().getIdentifier(resName, "drawable", context.getPackageName());
    if (id == 0) {    //エラーにはならない
        throw new FileNotFoundException("Not Found - " + resName);
    }
    return context.getResources().getDrawable(id);
}

//メインでは... (※例外処理は省略)
String resName = "sample";  //"res/drawable-nodpi/sample.jpg" 等
Drawable drawable = loadDrawableResource(resName, this);  //this は起動した Activity が良い(Context)

Drawable drawable = getContext().getResources().getDrawable(R.drawable.sample);