internal RECT(PSIZE size)
{
Left = 0;
Top = 0;
Right = size.x - 1;
Bottom = size.y - 1;
}
private static void CenterAndScaleRectangle(ref Rect rectangle, PSIZE size)
{
var height = rectangle.Height;
var width = rectangle.Width;
if (size.x < size.y)
{
double ScaleFactor = width / (double)size.y;
int scaledX = (int)(size.x * ScaleFactor);
int xOffset = (width - scaledX) / 2;
rectangle.Left += xOffset;
rectangle.Right -= xOffset;
}
if (size.y < size.x)
{
double ScaleFactor = height / (double)size.x;
int scaledY = (int)(size.y * ScaleFactor);
int yOffset = (height - scaledY) / 2;
rectangle.Top += yOffset;
rectangle.Bottom -= yOffset;
}
}
internal static extern int DwmQueryThumbnailSourceSize(IntPtr thumb, out PSIZE size);
public static extern void DwmQueryThumbnailSourceSize(
IntPtr hThumbnail, out PSIZE size);
public static extern int DwmQueryThumbnailSourceSize(IntPtr thumb, out PSIZE size);
private PSIZE GetThumbSize(PSIZE sourceSize, Rectangle destination)
{
if (sourceSize.x < destination.Width && sourceSize.y < destination.Height)
{
return sourceSize;
}
else
{
PSIZE size = new PSIZE();
float whq = sourceSize.x / (float)sourceSize.y; // width-height quotient
int respectiveHeight = (int)(destination.Width / whq);
int respectiveWidth = (int)(destination.Height * whq);
if ((whq < 1 && respectiveHeight <= destination.Height) ||
respectiveWidth > destination.Width)
{
size.x = destination.Width;
size.y = respectiveHeight;
}
else
{
size.x = respectiveWidth;
size.y = destination.Height;
}
return size;
}
}
static extern int DwmQueryThumbnailSourceSize(ThumbnailSafeHandle hThumbnail, ref PSIZE pSize);
