/// <summary>
/// Analizes all frames (from the end to the start) and paints all unchanged pixels with a given color,
/// after, it cuts the image to reduce filesize.
/// </summary>
/// <param name="listToEncode">The list of frames to analize.</param>
/// <param name="id">The Id of the Task.</param>
/// <param name="tokenSource">The cancelation token source.</param>
public static List <FrameInfo> CutUnchanged(List <FrameInfo> listToEncode, int id, CancellationTokenSource tokenSource)
{
//First frame rect.
var size = listToEncode[0].ImageLocation.ScaledSize();
listToEncode[0].Rect = new Int32Rect(0, 0, (int)size.Width, (int)size.Height);
//End to start FOR
for (var index = listToEncode.Count - 1; index > 0; index--)
{
#region Cancellation
if (tokenSource.Token.IsCancellationRequested)
{
Windows.Other.Encoder.SetStatus(Status.Canceled, id);
break;
}
#endregion
#region For each Frame, from the end to the start
Windows.Other.Encoder.Update(id, index - 1);
//First frame is ignored.
if (index <= 0)
{
continue;
}
#region Get Image Info
var imageAux1 = listToEncode[index - 1].ImageLocation.From();
var imageAux2 = listToEncode[index].ImageLocation.From();
var startY = new bool[imageAux1.Height];
var startX = new bool[imageAux1.Width];
var image1 = new PixelUtilOld(imageAux1); //Previous image
var image2 = new PixelUtilOld(imageAux2); //Actual image
image1.LockBits();
image2.LockBits();
var height = imageAux1.Height;
var width = imageAux1.Width;
#endregion
//Only use Parallel if the image is big enough.
if (width * height > 150000)
{
#region Parallel Loop
//x - width - sides
Parallel.For(0, width, x =>
{
//y - height - up/down
for (var y = 0; y < height; y++)
{
if (image1.GetPixel(x, y) != image2.GetPixel(x, y))
{
#region Get the Changed Pixels
startX[x] = true;
startY[y] = true;
#endregion
}
}
}); //SPEEEEEED, alot!
#endregion
}
else
{
#region Sequential Loop
//x - width - sides
for (var x = 0; x < width; x++)
{
//y - height - up/down
for (var y = 0; y < height; y++)
{
#region For each Pixel
if (image1.GetPixel(x, y) == image2.GetPixel(x, y))
{
continue;
}
#region Get the Changed Pixels
startX[x] = true;
startY[y] = true;
#endregion
#endregion
}
}
#endregion
}
image1.UnlockBits();
image2.UnlockBits();
#region Verify positions
var firstX = startX.ToList().FindIndex(x => x);
var lastX = startX.ToList().FindLastIndex(x => x);
if (firstX == -1)
{
firstX = 0;
}
if (lastX == -1)
{
lastX = imageAux1.Width;
}
var firstY = startY.ToList().FindIndex(x => x);
var lastY = startY.ToList().FindLastIndex(x => x);
if (lastY == -1)
{
lastY = imageAux1.Height;
}
if (firstY == -1)
{
firstY = 0;
}
if (lastX < firstX)
{
var aux = lastX;
lastX = firstX;
firstX = aux;
}
if (lastY < firstY)
{
var aux = lastY;
lastY = firstY;
firstY = aux;
}
#endregion
#region Get the Width and Height
var heightCut = Math.Abs(lastY - firstY);
var widthCut = Math.Abs(lastX - firstX);
//If nothing changed, shift the delay.
if (heightCut + widthCut == height + width)
{
listToEncode[index - 1].Delay += listToEncode[index].Delay;
listToEncode[index].Rect = new Int32Rect(0, 0, 0, 0);
GC.Collect(1);
continue;
}
if (heightCut != height)
{
heightCut++;
}
if (widthCut != width)
{
widthCut++;
}
listToEncode[index].Rect = new Int32Rect(firstX, firstY, widthCut, heightCut);
#endregion
#region Update Image Info and Save
//Cut the images and get the new values.
var imageSave2 = new Bitmap(imageAux2.Clone(new Rectangle(firstX, firstY, widthCut, heightCut), imageAux2.PixelFormat));
imageAux2.Dispose();
imageAux1.Dispose();
imageSave2.Save(listToEncode[index].ImageLocation);
#endregion
GC.Collect(1);
#endregion
}
return(listToEncode);
}
/// <summary>
/// Calculates the difference between one given frame and another.
/// </summary>
/// <param name="first">The first frame to compare.</param>
/// <param name="second">The second frame to compare.</param>
/// <returns>The similarity between the two frames in percentage.</returns>
public static double CalculateDifference(FrameInfo first, FrameInfo second)
{
#region Get Image Info
var imageAux1 = first.Path.From();
var imageAux2 = second.Path.From();
var image1 = new PixelUtilOld(imageAux1); //First image
var image2 = new PixelUtilOld(imageAux2); //Last image
image1.LockBits();
image2.LockBits();
var height = imageAux1.Height;
var width = imageAux1.Width;
var equalCount = 0;
#endregion
//Only use Parallel if the image is big enough.
if (width * height > 150000)
{
#region Parallel Loop
//x - width - sides
Parallel.For(0, width, x =>
{
//y - height - up/down
for (var y = 0; y < height; y++)
{
if (image1.GetPixel(x, y) == image2.GetPixel(x, y))
{
Interlocked.Increment(ref equalCount);
}
//equalCount = equalCount + (image1.GetPixel(x, y) == image2.GetPixel(x, y) ? 1 : 0);
}
});
#endregion
}
else
{
#region Sequential Loop
//x - width - sides
for (var x = 0; x < width; x++)
{
//y - height - up/down
for (var y = 0; y < height; y++)
{
equalCount = equalCount + (image1.GetPixel(x, y) == image2.GetPixel(x, y) ? 1 : 0);
}
}
#endregion
}
image1.UnlockBits();
image2.UnlockBits();
GC.Collect(1);
return(Other.CrossMultiplication(width * height, equalCount, null));
}
