// Get scaling factor limited to available memory
private static float GetUpperScalingLimit(SizeF scaledSize, float scalingFactor)
{
// estimate required memory and use 60% as threshold value
var required = EffectGraph.GetEstimatedRequiredMemory(scaledSize);
var threshold = (EffectGraph.AvailableMemory * 100) / 60;
if (required > threshold)
{
// limit scaling factor to fit available memory
var maxPixels = EffectGraph.GetMaximumPixelCount(threshold);
var originalPixels = ((double)scaledSize.Width * scaledSize.Height) / scalingFactor;
return((float)(maxPixels / originalPixels));
}
return(scalingFactor);
}
/// <summary>
/// Return the estimated amount of memory required to process the effect
/// </summary>
/// <param name="size">Size of the input image</param>
/// <param name="scalingFactor">Scaling factor</param>
/// <returns>Estimated number of bytes required to process the effect</returns>
public static long GetEstimatedRequiredMemory(Size size, float scalingFactor)
{
return(EffectGraph.GetEstimatedRequiredMemory(size.ScaleBy(scalingFactor)));
}