PhotoCam.cs

/**
 *  In this example, we rotate the Texture2D on the main thread (which will block)
 */
void OnPhoto (Texture2D photo, Orientation orientation) {
    // Rotate the image
    Utilities.RotateImage(photo, orientation, null, null, (rotated, unused) => preview.texture = rotated);
}

/**
 *  In this example, we rotate the Texture2D on a worker thread then invoke the callback on the main thread (required as Unity is not thread safe)
 */
void OnPhoto (Texture2D photo, Orientation orientation) {
    // Create IDispatches for a worker thread and the main thread
    IDispatch worker = new ConcurrentDispatch(), main = new MainDispatch();
    // Rotate the image
    Utilities.RotateImage(photo, orientation, worker, main, (rotated, unused) => preview.texture = rotated);
}

/**
 *  In this example, we rotate the pixels then update the Texture2D with it
 *  Since the rotation is done on the main thread, the call to RotateImage will block
 */
void OnPhoto (Texture2D photo, Orientation orientation) {
    // Get the pixels
    var pixels = photo.GetPixels32();
    // Allocate a destination buffer for the rotated pixels
    var rotated = new Color32[pixels.Length];
    // Rotate the image
    Utilities.RotateImage(rotated, orientation, photo.width, photo.height, (byte)orientation);
    // If we are rotating by 90 or 270 degrees, then we must resize the texture itself, swapping the width and height
    if ((orientation & Orientation.Rotation_90) == Orientation.Rotation_90 || (orientation & Orientation.Rotation_270) == Orientation.Rotation_270) photo.Resize(photo.height, photo.width);
    // Set pixels and apply
    photo.SetPixels32(rotated);
    photo.Apply();
    // Display the photo
    preview.texture = photo;
}