带有矩阵变换的C＃Bitmap类

Question

我正在使用矩阵类来剪切我的图像。但是如何计算新位图的预期宽度和高度？

Bitmap bitmap=new Bitmap(x,y);
Matrix matrix = new Matrix();
matrix.Shear(1, 0.2);            
Graphics graphics = Graphics.FromImage(bitmap);
graphics.Transform = matrix;
graphics.DrawImage(imageToSkew, 0, 0);
bitmap.Save(outputstream,imageformat);