App crashes when calling GetPixels on large image?

Unity Engine
, ,
1

Hey there,
when loading large images (5000x5000 pixels), and calling GetPixels on them, it crashes on android. This is a minimal example…

void Start()
    {
        var path = Path.Combine(Application.persistentDataPath, "test.png");
        byte[] fileData = File.ReadAllBytes(path);
        tex = new Texture2D(2, 2);
        tex.LoadImage(fileData); // auto-resize the texture dimensions.
    }
   
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            var colors = tex.GetPixels();
            Debug.Log(colors.Length);
        }
    }

After clicking four times on the screen, the app crashes. I know the images are large, but is that usual?
Furthermore, how can I catch the crash and notify the user that the image is to large? Maybe it has something to do with the device hardware, so but I don’t know the limit for texture on phones. Also I would like to support at least 5000x5000 pixels if possible.

Here is a snippet of the logcat:

    Version '2021.3.4f1 (cb45f9cae8b7)', Build type 'Release', Scripting Backend 'mono', CPU 'armeabi-v7a'
    Build fingerprint: 'samsung/beyond1lteeea/beyond1:11/RP1A.200720.012/G973FXXU9EUA4:user/release-keys'
    Revision: '26'
    ABI: 'arm'
    Timestamp: 2022-07-05 16:51:15+0200
    pid: 25813, tid: 26042, name: UnityMain  >>> com.DefaultCompany.TextureCrash <<<
    uid: 10316
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x10
    Cause: null pointer dereference
        r0  9b230020  r1  00000020  r2  00000010  r3  00000010
        r4  b5e91ec8  r5  b62eb384  r6  b62eb390  r7  000004e2
        r8  00000004  r9  b62eb310  r10 00001388  r11 b62eb358
        ip  00000020  sp  b62eb308  lr  000004e1  pc  b53f7ad0
managed backtrace:
          #00 (wrapper managed-to-native) UnityEngine.Texture2D:GetPixels (UnityEngine.Texture2D,int,int,int,int,int)
          #01 UnityEngine.Texture2D:GetPixels (int) <0xaf>
          #02 UnityEngine.Texture2D:GetPixels () <0x17>
          #03 Test:Update () <0x2f>
          #04 (wrapper runtime-invoke) object:runtime_invoke_void__this__ (object,intptr,intptr,intptr)
   
        at libunity.0x6acad0(Native Method)

Help would be really apprechiated!

2

Try checking the max texture size on that device with this.

3

Thats a good ideas. The max texture size is 8192 so it should be ok. Also, calling GetPixels for the first time works without a problem. But after calling it a fourth time in a row, the app crashes. Maybe, the data is not garbage collected properly and the pixels are still stored after an update?

4

Sounds more like OOM(out of memory) issue.

5

Yes, would be nice to check the memory before it happes, but I don’t know how. Any ideas?