public static void ApplyLetterBoxing(ref RECT rendertTargetArea, float frameWidth, float frameHeight, double aspectRatio)
{
float ratio = frameWidth / frameHeight;
if(aspectRatio > 0)
{
ratio *= (float)aspectRatio;
}
float targetW = Math.Abs((float)(rendertTargetArea.Right - rendertTargetArea.Left));
float targetH = Math.Abs((float)(rendertTargetArea.Bottom - rendertTargetArea.Top));
float tempH = targetW / ratio;
if(tempH <= targetH)
{
float deltaH = Math.Abs(tempH - targetH) / 2;
rendertTargetArea.Top += (int)deltaH;
rendertTargetArea.Bottom -= (int)deltaH;
}
else
{
float tempW = targetH * ratio;
float deltaW = Math.Abs(tempW - targetW) / 2;
rendertTargetArea.Left += (int)deltaW;
rendertTargetArea.Right -= (int)deltaW;
}
}
public static extern bool GetClientRect(IntPtr hWnd, ref RECT lpRect);
public static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);