/* 利用双线性插值把图片缩放为2的幂次方
* 寻找最近的值来进行缩放，表已经在初始化时计算好了
*/
static public Bitmap scale2SquareSize(Bitmap bit)
{
// 找出长宽的大值，用于缩放
int tempM = 0;
// 存放目标分辨率大小
int size = 0;
int width = bit.Width;
int height = bit.Height;
if (width <= height)
{
tempM = height;
}
else
{
tempM = width;
}
for (int i = 0; i < 16; i++)
{
if (tempM == array4two[i])
{
size = array4two[i];
break;
}
if (tempM > array4two[i])
{
continue;
}
if (tempM - array4two[i - 1] > array4two[i] - tempM)
{
size = array4two[i];
break;
}
else
{
size = array4two[i - 1];
break;
}
}
return(GraphicClass.bilinearInterpolation(bit, size, size));
}
private void bilinerToolStripMenuItem_Click(object sender, EventArgs e)
{
checkPictureBox1();
if (!valid)
{
return;
}
Bitmap bit = new Bitmap(pictureBox1.Image);
PassValueForm form = new PassValueForm();
form.Owner = this;
form.Description = "输入要变化成的分辨率， 上面为宽，下面为长";
DialogResult result = form.ShowDialog();
if (result == DialogResult.OK)
{
pictureBox2.Refresh();
int width = Convert.ToInt32(form.Value);
int height = Convert.ToInt32(form.Value1);
pictureBox2.Image = GraphicClass.bilinearInterpolation(bit, width, height);
}
}