[MonoTouch] Memory pressure loading a bunch of PNG images in MonoTouch

[WP7_MonoTouch]

I need to read a lot of png images and show them like a video player. I
developed my application on Windows Phone 7 using a background task that
loads an image when it detects that the main thread needs a new file to
show.

void LoadTextureInBackground()
    {
        if (currentMovie == null) return;

        DateTime timeOnstart = DateTime.Now;

        // Mantenemos 2 texturas en memoria para no cargar sobre el mismo
objeto texture.
        string fileName = currentMovie.GetFileName();

        if (lastFileName == fileName) return;

        textureLoaded[currentTexture] =
Texture2D.FromStream(Device.GraphicsDevice, fileName);

        texture = textureLoaded[currentTexture];

        currentTexture = 1 - currentTexture;

        lastFileName = fileName;

        GC.Collect();
        System.Threading.Thread.Sleep(50);
    }

(Texture2D.FromStream it's only a wrapper for UIImage.FromFile)


    /// <summary>
    /// This is called when the game should draw itself.
    /// </summary>
    /// Provides a snapshot of timing values.
    public void Draw(TimeSpan totalTime,TimeSpan elapsedTime)
    {
        if(currentMovie==null) return;

       // Mantenemos 2 texturas en memoria para no cargar sobre el mismo
objeto texture.

        if (texture == null) return;

        int newWidth = (int)(texture.Width*RenderSize);
        int newHeight = (int)(texture.Height*RenderSize);

        Texture2D drawTexture = texture;

        // Al cargar usando Texture2D.FromStream, la textura NO lleva
elAlpha premultiplicado

        //Device.SpriteBatch.Draw(drawTexture, destination, Color.White);
        if(CultTravel.AppDelegate.ImagePng.Image!=drawTexture.Texture)
        {
            AppDelegate.ImagePng.Image=drawTexture.Texture;
            AppDelegate.ImagePng.Frame=new
System.Drawing.RectangleF(0,480-newHeight,ImagePng.Image.CGImage.Width,newHeight);

        // Si la textura que tengo cargada y lista para mostrar es diferente
a la que mostraba, libero la antigua
        if (lastTextureDraw!=null && lastTextureDraw != texture)
        {
            lastTextureDraw.Dispose();
        }

        lastTextureDraw = texture;

    }

Everything is ok in the emulator but in the iPad, after a minute or
something like that, the debugger informs me about a 'memory pressure'.

I solved this issue calling to the GC.Collect() method, but I MUST DISABLE
THE BACKGROUND TASK ( and hence do all the loading stuff in the Draw method)

I've tried to do the GC.Collect in the background task. It doesn't work.

I've tried to do the GC.Collect in the background task & the main task. It
doesn't work.

So, there is something 'different' i should do for collect the memory and
enable the background task again?

Thanks!!


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